Merge pull request #165 from vbatts/change-ci

Change ci

.drone.yml

@@ -1,19 +1,13 @@
-language: go
-go:
-  - 1.7.4
-  - 1.6.3
-
-sudo: false
-
-before_install:
+kind: pipeline
+name: default
+steps:
+steps:
+- name: build
+  image: golang
+  commands:
   - git config --global url."https://".insteadOf git://
-  - go get -u github.com/golang/lint/golint
-  - go get -u github.com/Masterminds/glide
+  - make install.tools
   - mkdir -p $GOPATH/src/github.com/vbatts && ln -sf $(pwd) $GOPATH/src/github.com/vbatts/go-mtree
-
-install: true
-
-script:
   - make validation
   - make validation.tags
   - make build.arches

.github/workflows/go.yml

@@ -0,0 +1,28 @@
+name: Go
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.16
+
+    - name: Build
+      run: make
+
+    - name: Test
+      run: make validation
+      
+    - name: Build.Arches
+      run: make build.arches

.gitignore

@@ -0,0 +1,6 @@
+*~
+.cli.test
+.lint
+.test
+.vet
+gomtree

.vscode/tasks.json

@@ -0,0 +1,66 @@
+// Available variables which can be used inside of strings.
+// ${workspaceRoot}: the root folder of the team
+// ${file}: the current opened file
+// ${fileBasename}: the current opened file's basename
+// ${fileDirname}: the current opened file's dirname
+// ${fileExtname}: the current opened file's extension
+// ${cwd}: the current working directory of the spawned process
+
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "taskName": "build",
+            "type": "shell",
+            "command": "time go build .",
+            "problemMatcher": [
+                "$go"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "presentation": {
+                "echo": true,
+                "reveal": "silent",
+                "focus": true,
+                "panel": "shared"
+            }
+        },
+        {
+            "taskName": "build.arches",
+            "type": "shell",
+            "command": "make build.arches",
+            "problemMatcher": [
+                "$go"
+            ],
+            "group": "build",
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": true,
+                "panel": "shared"
+            }
+        },
+        {
+            "taskName": "test",
+            "command": "time go test -v .",            
+            "type": "shell",
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            },
+            "problemMatcher": [
+                "$go"
+            ],
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": true,
+                "panel": "shared"
+            }
+        }
+    ]
+}

Makefile

@@ -4,10 +4,11 @@ BUILDPATH := github.com/vbatts/go-mtree/cmd/gomtree
 CWD := $(shell pwd)
 SOURCE_FILES := $(shell find . -type f -name "*.go")
 CLEAN_FILES := *~
-TAGS := cvis
+TAGS :=
 ARCHES := linux,386 linux,amd64 linux,arm linux,arm64 openbsd,amd64 windows,amd64 darwin,amd64
+GO_VER := go1.14
 
-default: build validation 
+default: build validation
 
 .PHONY: validation
 validation: .test .lint .vet .cli.test
@@ -19,12 +20,13 @@ validation.tags: .test.tags .vet.tags .cli.test
 test: .test
 
 CLEAN_FILES += .test .test.tags
+NO_VENDOR_DIR := $(shell find . -type f -name '*.go' ! -path './vendor*' ! -path './.git*' ! -path './.vscode*' -exec dirname "{}" \; | sort -u)
 
 .test: $(SOURCE_FILES)
-	go test -v $$(glide novendor) && touch $@
+	go test -v $(NO_VENDOR_DIR) && touch $@
 
 .test.tags: $(SOURCE_FILES)
-	set -e ; for tag in $(TAGS) ; do go test -tags $$tag -v $$(glide novendor) ; done && touch $@
+	set -e ; for tag in $(TAGS) ; do go test -tags $$tag -v $(NO_VENDOR_DIR) ; done && touch $@
 
 .PHONY: lint
 lint: .lint
@@ -32,7 +34,11 @@ lint: .lint
 CLEAN_FILES += .lint
 
 .lint: $(SOURCE_FILES)
-	set -e ; for dir in $$(glide novendor) ; do golint -set_exit_status $$dir ; done && touch $@
+	@if [ "$(findstring $(GO_VER),$(shell go version))" != "" ] ; then \
+		set -e ; for dir in $(NO_VENDOR_DIR) ; do golint -set_exit_status $$dir ; done && touch $@ \
+	else \
+		touch $@ ; \
+	fi
 
 .PHONY: vet
 vet: .vet .vet.tags
@@ -40,10 +46,10 @@ vet: .vet .vet.tags
 CLEAN_FILES += .vet .vet.tags
 
 .vet: $(SOURCE_FILES)
-	go vet $$(glide novendor) && touch $@
+	go vet $(NO_VENDOR_DIR) && touch $@
 
 .vet.tags: $(SOURCE_FILES)
-	set -e ; for tag in $(TAGS) ; do go vet -tags $$tag -v $$(glide novendor) ; done && touch $@
+	set -e ; for tag in $(TAGS) ; do go vet -tags $$tag -v $(NO_VENDOR_DIR) ; done && touch $@
 
 .PHONY: cli.test
 cli.test: .cli.test
@@ -62,6 +68,12 @@ build: $(BUILD)
 $(BUILD): $(SOURCE_FILES)
 	go build -o $(BUILD) $(BUILDPATH)
 
+install.tools:
+	@go get -u github.com/fatih/color ; \
+	if [ "$(findstring $(GO_VER),$(shell go version))" != "" ] ; then \
+		go get -u golang.org/x/lint/golint ;\
+	fi
+
 ./bin:
 	mkdir -p $@
 

README.md

@@ -1,5 +1,7 @@
 # go-mtree
 
+[![Go Report Card](https://goreportcard.com/badge/github.com/vbatts/go-mtree)](https://goreportcard.com/report/github.com/vbatts/go-mtree)
+
 `mtree` is a filesystem hierarchy validation tooling and format.
 This is a library and simple cli tool for [mtree(8)][mtree(8)] support.
 

check.go

@@ -18,13 +18,3 @@ func Check(root string, dh *DirectoryHierarchy, keywords []Keyword, fs FsEval) (
 
 	return Compare(dh, newDh, keywords)
 }
-
-// TarCheck is the tar equivalent of checking a file hierarchy spec against a
-// tar stream to determine if files have been changed. This is precisely
-// equivalent to Compare(dh, tarDH, keywords).
-func TarCheck(tarDH, dh *DirectoryHierarchy, keywords []Keyword) ([]InodeDelta, error) {
-	if keywords == nil {
-		return Compare(dh, tarDH, dh.UsedKeywords())
-	}
-	return Compare(dh, tarDH, keywords)
-}

check_test.go

@@ -12,7 +12,7 @@ import (
 // simple walk of current directory, and imediately check it.
 // may not be parallelizable.
 func TestCheck(t *testing.T) {
-	dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
+	dh, err := Walk(".", nil, append(DefaultKeywords, []Keyword{"sha1", "xattr"}...), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -58,8 +58,8 @@ func TestCheckKeywords(t *testing.T) {
 	}
 
 	// Touch a file, so the mtime changes.
-	now := time.Now()
-	if err := os.Chtimes(tmpfn, now, now); err != nil {
+	newtime := time.Date(2006, time.February, 1, 3, 4, 5, 0, time.UTC)
+	if err := os.Chtimes(tmpfn, newtime, newtime); err != nil {
 		t.Fatal(err)
 	}
 

cmd/gomtree/main.go

@@ -7,21 +7,22 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
 	"os"
 	"strings"
 
+	"github.com/sirupsen/logrus"
 	"github.com/vbatts/go-mtree"
 )
 
 var (
 	// Flags common with mtree(8)
-	flCreate        = flag.Bool("c", false, "create a directory hierarchy spec")
-	flFile          = flag.String("f", "", "directory hierarchy spec to validate")
-	flPath          = flag.String("p", "", "root path that the hierarchy spec is relative to")
-	flAddKeywords   = flag.String("K", "", "Add the specified (delimited by comma or space) keywords to the current set of keywords")
-	flUseKeywords   = flag.String("k", "", "Use the specified (delimited by comma or space) keywords as the current set of keywords")
-	flDirectoryOnly = flag.Bool("d", false, "Ignore everything except directory type files")
+	flCreate           = flag.Bool("c", false, "create a directory hierarchy spec")
+	flFile             = flag.String("f", "", "directory hierarchy spec to validate")
+	flPath             = flag.String("p", "", "root path that the hierarchy spec is relative to")
+	flAddKeywords      = flag.String("K", "", "Add the specified (delimited by comma or space) keywords to the current set of keywords")
+	flUseKeywords      = flag.String("k", "", "Use the specified (delimited by comma or space) keywords as the current set of keywords")
+	flDirectoryOnly    = flag.Bool("d", false, "Ignore everything except directory type files")
+	flUpdateAttributes = flag.Bool("u", false, "Modify the owner, group, permissions and xattrs of files, symbolic links and devices, to match the provided specification. This is not compatible with '-T'.")
 
 	// Flags unique to gomtree
 	flListKeywords     = flag.Bool("list-keywords", false, "List the keywords available")
@@ -36,7 +37,7 @@ var (
 func main() {
 	// so that defers cleanly exec
 	if err := app(); err != nil {
-		log.Fatal(err)
+		logrus.Fatal(err)
 	}
 }
 
@@ -45,6 +46,7 @@ func app() error {
 
 	if *flDebug {
 		os.Setenv("DEBUG", "1")
+		logrus.SetLevel(logrus.DebugLevel)
 	}
 
 	if *flVersion {
@@ -208,6 +210,12 @@ func app() error {
 		excludes = append(excludes, mtree.ExcludeNonDirectories)
 	}
 
+	// -u
+	// Failing early here. Processing is done below.
+	if *flUpdateAttributes && *flTar != "" {
+		return fmt.Errorf("ERROR: -u can not be used with -T")
+	}
+
 	// -T <tar file>
 	if *flTar != "" {
 		var input io.Reader
@@ -242,6 +250,43 @@ func app() error {
 		}
 	}
 
+	// -u
+	if *flUpdateAttributes && stateDh != nil {
+		// -u
+		// this comes before the next case, intentionally.
+		result, err := mtree.Update(rootPath, specDh, mtree.DefaultUpdateKeywords, nil)
+		if err != nil {
+			return err
+		}
+		if result != nil && len(result) > 0 {
+			fmt.Printf("%#v\n", result)
+		}
+
+		var res []mtree.InodeDelta
+		// only check the keywords that we just updated
+		res, err = mtree.Check(rootPath, specDh, mtree.DefaultUpdateKeywords, nil)
+		if err != nil {
+			return err
+		}
+		if res != nil {
+			out := formatFunc(res)
+			if _, err := os.Stdout.Write([]byte(out)); err != nil {
+				return err
+			}
+
+			// TODO: This should be a flag. Allowing files to be added and
+			//       removed and still returning "it's all good" is simply
+			//       unsafe IMO.
+			for _, diff := range res {
+				if diff.Type() == mtree.Modified {
+					return fmt.Errorf("mainfest validation failed")
+				}
+			}
+		}
+
+		return nil
+	}
+
 	// -c
 	if *flCreate {
 		fh := os.Stdout
@@ -257,10 +302,22 @@ func app() error {
 		return nil
 	}
 
+	// no spec manifest has been provided yet, so look for it on stdin
+	if specDh == nil {
+		// load the hierarchy
+		specDh, err = mtree.ParseSpec(os.Stdin)
+		if err != nil {
+			return err
+		}
+
+		// We can't check against more fields than in the specKeywords list, so
+		// currentKeywords can only have a subset of specKeywords.
+		specKeywords = specDh.UsedKeywords()
+	}
+
 	// This is a validation.
 	if specDh != nil && stateDh != nil {
 		var res []mtree.InodeDelta
-
 		res, err = mtree.Compare(specDh, stateDh, currentKeywords)
 		if err != nil {
 			return err

compare.go

@@ -29,6 +29,14 @@ const (
 	// have different values (or have not been set in one of the
 	// manifests).
 	Modified DifferenceType = "modified"
+
+	// Same represents the case where two files are the same. These are
+	// only generated from CompareSame().
+	Same DifferenceType = "same"
+
+	// ErrorDifference represents an attempted update to the values of
+	// a keyword that failed
+	ErrorDifference DifferenceType = "errored"
 )
 
 // These functions return *type from the parameter. It's just shorthand, to
@@ -126,6 +134,7 @@ type KeyDelta struct {
 	name Keyword
 	old  string
 	new  string
+	err  error // used for update delta results
 }
 
 // Type returns the type of discrepancy encountered when comparing this key
@@ -152,10 +161,10 @@ func (k KeyDelta) Old() *string {
 
 // New returns the value of the KeyDeltaVal entry in the "new" DirectoryHierarchy
 // (as determined by the ordering of parameters to Compare). Returns nil if
-// there was no entry in the "old" DirectoryHierarchy.
+// there was no entry in the "new" DirectoryHierarchy.
 func (k KeyDelta) New() *string {
 	if k.diff == Modified || k.diff == Extra {
-		return sPtr(k.old)
+		return sPtr(k.new)
 	}
 	return nil
 }
@@ -192,7 +201,7 @@ func compareEntry(oldEntry, newEntry Entry) ([]KeyDelta, error) {
 	for _, kv := range oldKeys {
 		key := kv.Keyword()
 		// only add this diff if the new keys has this keyword
-		if key != "tar_time" && key != "time" && key != "xattr" && HasKeyword(newKeys, key) == emptyKV {
+		if key != "tar_time" && key != "time" && key.Prefix() != "xattr" && len(HasKeyword(newKeys, key)) == 0 {
 			continue
 		}
 
@@ -211,7 +220,7 @@ func compareEntry(oldEntry, newEntry Entry) ([]KeyDelta, error) {
 	for _, kv := range newKeys {
 		key := kv.Keyword()
 		// only add this diff if the old keys has this keyword
-		if key != "tar_time" && key != "time" && key != "xattr" && HasKeyword(oldKeys, key) == emptyKV {
+		if key != "tar_time" && key != "time" && key.Prefix() != "xattr" && len(HasKeyword(oldKeys, key)) == 0 {
 			continue
 		}
 
@@ -294,7 +303,7 @@ func compareEntry(oldEntry, newEntry Entry) ([]KeyDelta, error) {
 
 		// Modified
 		default:
-			if !KeyValEqual(*diff.Old, *diff.New) {
+			if !diff.Old.Equal(*diff.New) {
 				results = append(results, KeyDelta{
 					diff: Modified,
 					name: name,
@@ -308,21 +317,8 @@ func compareEntry(oldEntry, newEntry Entry) ([]KeyDelta, error) {
 	return results, nil
 }
 
-// Compare compares two directory hierarchy manifests, and returns the
-// list of discrepancies between the two. All of the entries in the
-// manifest are considered, with differences being generated for
-// RelativeType and FullType entries. Differences in structure (such as
-// the way /set and /unset are written) are not considered to be
-// discrepancies. The list of differences are all filesystem objects.
-//
-// keys controls which keys will be compared, but if keys is nil then all
-// possible keys will be compared between the two manifests (allowing for
-// missing entries and the like). A missing or extra key is treated as a
-// Modified type.
-//
-// NB: The order of the parameters matters (old, new) because Extra and
-//     Missing are considered as different discrepancy types.
-func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, error) {
+// compare is the actual workhorse for Compare() and CompareSame()
+func compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword, same bool) ([]InodeDelta, error) {
 	// Represents the new and old states for an entry.
 	type stateT struct {
 		Old *Entry
@@ -333,43 +329,47 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
 	// map to make sure we don't start comparing unrelated entries.
 	diffs := map[string]*stateT{}
 
-	// First, iterate over the old hierarchy.
-	for _, e := range oldDh.Entries {
-		if e.Type == RelativeType || e.Type == FullType {
-			path, err := e.Path()
-			if err != nil {
-				return nil, err
-			}
+	// First, iterate over the old hierarchy. If nil, pretend it's empty.
+	if oldDh != nil {
+		for _, e := range oldDh.Entries {
+			if e.Type == RelativeType || e.Type == FullType {
+				path, err := e.Path()
+				if err != nil {
+					return nil, err
+				}
 
-			// Cannot take &kv because it's the iterator.
-			copy := new(Entry)
-			*copy = e
+				// Cannot take &kv because it's the iterator.
+				cEntry := new(Entry)
+				*cEntry = e
 
-			_, ok := diffs[path]
-			if !ok {
-				diffs[path] = &stateT{}
+				_, ok := diffs[path]
+				if !ok {
+					diffs[path] = &stateT{}
+				}
+				diffs[path].Old = cEntry
 			}
-			diffs[path].Old = copy
 		}
 	}
 
-	// Then, iterate over the new hierarchy.
-	for _, e := range newDh.Entries {
-		if e.Type == RelativeType || e.Type == FullType {
-			path, err := e.Path()
-			if err != nil {
-				return nil, err
-			}
+	// Then, iterate over the new hierarchy. If nil, pretend it's empty.
+	if newDh != nil {
+		for _, e := range newDh.Entries {
+			if e.Type == RelativeType || e.Type == FullType {
+				path, err := e.Path()
+				if err != nil {
+					return nil, err
+				}
 
-			// Cannot take &kv because it's the iterator.
-			copy := new(Entry)
-			*copy = e
+				// Cannot take &kv because it's the iterator.
+				cEntry := new(Entry)
+				*cEntry = e
 
-			_, ok := diffs[path]
-			if !ok {
-				diffs[path] = &stateT{}
+				_, ok := diffs[path]
+				if !ok {
+					diffs[path] = &stateT{}
+				}
+				diffs[path].New = cEntry
 			}
-			diffs[path].New = copy
 		}
 	}
 
@@ -409,7 +409,7 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
 			if keys != nil {
 				var filterChanged []KeyDelta
 				for _, keyDiff := range changed {
-					if InKeywordSlice(keyDiff.name, keys) {
+					if InKeywordSlice(keyDiff.name.Prefix(), keys) {
 						filterChanged = append(filterChanged, keyDiff)
 					}
 				}
@@ -425,9 +425,47 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
 					new:  *diff.New,
 					keys: changed,
 				})
+			} else if same {
+				// this means that nothing changed, i.e. that
+				// the files are the same.
+				results = append(results, InodeDelta{
+					diff: Same,
+					path:  path,
+					old:   *diff.Old,
+					new:   *diff.New,
+					keys:  changed,
+				})
 			}
 		}
 	}
 
 	return results, nil
 }
+
+// Compare compares two directory hierarchy manifests, and returns the
+// list of discrepancies between the two. All of the entries in the
+// manifest are considered, with differences being generated for
+// RelativeType and FullType entries. Differences in structure (such as
+// the way /set and /unset are written) are not considered to be
+// discrepancies. The list of differences are all filesystem objects.
+//
+// keys controls which keys will be compared, but if keys is nil then all
+// possible keys will be compared between the two manifests (allowing for
+// missing entries and the like). A missing or extra key is treated as a
+// Modified type.
+//
+// If oldDh or newDh are empty, we assume they are a hierarchy that is
+// completely empty. This is purely for helping callers create synthetic
+// InodeDeltas.
+//
+// NB: The order of the parameters matters (old, new) because Extra and
+//     Missing are considered as different discrepancy types.
+func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, error) {
+	return compare(oldDh, newDh, keys, false)
+}
+
+// CompareSame is the same as Compare, except it also includes the entries
+// that are the same with a Same DifferenceType.
+func CompareSame(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, error) {
+	return compare(oldDh, newDh, keys, true)
+}

cvis/cvis_test.go

@@ -1,15 +0,0 @@
-// +build cgo,!govis
-
-package cvis
-
-import "testing"
-
-// The resulting string of Vis output could potentially be four times longer than
-// the original. Vis must handle this possibility.
-func TestVisLength(t *testing.T) {
-	testString := "All work and no play makes Jack a dull boy\n"
-	for i := 0; i < 20; i++ {
-		Vis(testString, DefaultVisFlags)
-		testString = testString + testString
-	}
-}

cvis/unvis.c

@@ -1,293 +0,0 @@
-/*-
- * Copyright (c) 1989, 1993
- *      The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)unvis.c     8.1 (Berkeley) 6/4/93";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/cdefs.h>
-
-#include <sys/types.h>
-#include <ctype.h>
-#include "vis.h"
-
-/*
- * decode driven by state machine
- */
-#define S_GROUND        0       /* haven't seen escape char */
-#define S_START         1       /* start decoding special sequence */
-#define S_META          2       /* metachar started (M) */
-#define S_META1         3       /* metachar more, regular char (-) */
-#define S_CTRL          4       /* control char started (^) */
-#define S_OCTAL2        5       /* octal digit 2 */
-#define S_OCTAL3        6       /* octal digit 3 */
-#define S_HEX2          7       /* hex digit 2 */
-
-#define S_HTTP          0x080   /* %HEXHEX escape */
-
-#define isoctal(c)      (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
-#define ishex(c)        ((((u_char)(c)) >= '0' && ((u_char)(c)) <= '9') || (((u_char)(c)) >= 'a' && ((u_char)(c)) <= 'f'))
-
-/*
- * unvis - decode characters previously encoded by vis
- */
-int
-unvis(char *cp, int c, int *astate, int flag)
-{
-
-        if (flag & UNVIS_END) {
-                if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                }
-                return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
-        }
-
-        switch (*astate & ~S_HTTP) {
-
-        case S_GROUND:
-                *cp = 0;
-                if (c == '\\') {
-                        *astate = S_START;
-                        return (0);
-                }
-                if (flag & VIS_HTTPSTYLE && c == '%') {
-                        *astate = S_START | S_HTTP;
-                        return (0);
-                }
-                *cp = c;
-                return (UNVIS_VALID);
-
-        case S_START:
-                if (*astate & S_HTTP) {
-                    if (ishex(tolower(c))) {
-                        *cp = isdigit(c) ? (c - '0') : (tolower(c) - 'a');
-                        *astate = S_HEX2;
-                        return (0);
-                    }
-                }
-                switch(c) {
-                case '\\':
-                        *cp = c;
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case '0': case '1': case '2': case '3':
-                case '4': case '5': case '6': case '7':
-                        *cp = (c - '0');
-                        *astate = S_OCTAL2;
-                        return (0);
-                case 'M':
-                        *cp = 0200;
-                        *astate = S_META;
-                        return (0);
-                case '^':
-                        *astate = S_CTRL;
-                        return (0);
-                case 'n':
-                        *cp = '\n';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'r':
-                        *cp = '\r';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'b':
-                        *cp = '\b';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'a':
-                        *cp = '\007';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'v':
-                        *cp = '\v';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 't':
-                        *cp = '\t';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'f':
-                        *cp = '\f';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 's':
-                        *cp = ' ';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case 'E':
-                        *cp = '\033';
-                        *astate = S_GROUND;
-                        return (UNVIS_VALID);
-                case '\n':
-                        /*
-                         * hidden newline
-                         */
-                        *astate = S_GROUND;
-                        return (UNVIS_NOCHAR);
-                case '$':
-                        /*
-                         * hidden marker
-                         */
-                        *astate = S_GROUND;
-                        return (UNVIS_NOCHAR);
-                }
-                *astate = S_GROUND;
-                return (UNVIS_SYNBAD);
-
-        case S_META:
-                if (c == '-')
-                        *astate = S_META1;
-                else if (c == '^')
-                        *astate = S_CTRL;
-                else {
-                        *astate = S_GROUND;
-                        return (UNVIS_SYNBAD);
-                }
-                return (0);
-
-        case S_META1:
-                *astate = S_GROUND;
-                *cp |= c;
-                return (UNVIS_VALID);
-
-        case S_CTRL:
-                if (c == '?')
-                        *cp |= 0177;
-                else
-                        *cp |= c & 037;
-                *astate = S_GROUND;
-                return (UNVIS_VALID);
-
-        case S_OCTAL2:  /* second possible octal digit */
-                if (isoctal(c)) {
-                        /*
-                         * yes - and maybe a third
-                         */
-                        *cp = (*cp << 3) + (c - '0');
-                        *astate = S_OCTAL3;
-                        return (0);
-                }
-                /*
-                 * no - done with current sequence, push back passed char
-                 */
-                *astate = S_GROUND;
-                return (UNVIS_VALIDPUSH);
-
-        case S_OCTAL3:  /* third possible octal digit */
-                *astate = S_GROUND;
-                if (isoctal(c)) {
-                        *cp = (*cp << 3) + (c - '0');
-                        return (UNVIS_VALID);
-                }
-                /*
-                 * we were done, push back passed char
-                 */
-                return (UNVIS_VALIDPUSH);
-
-        case S_HEX2:    /* second mandatory hex digit */
-                if (ishex(tolower(c))) {
-                        *cp = (isdigit(c) ? (*cp << 4) + (c - '0') : (*cp << 4) + (tolower(c) - 'a' + 10));
-                }
-                *astate = S_GROUND;
-                return (UNVIS_VALID);
-
-        default:
-                /*
-                 * decoder in unknown state - (probably uninitialized)
-                 */
-                *astate = S_GROUND;
-                return (UNVIS_SYNBAD);
-        }
-}
-
-/*
- * strunvis - decode src into dst
- *
- *      Number of chars decoded into dst is returned, -1 on error.
- *      Dst is null terminated.
- */
-
-int
-strunvis(char *dst, const char *src)
-{
-        char c;
-        char *start = dst;
-        int state = 0;
-
-        while ( (c = *src++) ) {
-        again:
-                switch (unvis(dst, c, &state, 0)) {
-                case UNVIS_VALID:
-                        dst++;
-                        break;
-                case UNVIS_VALIDPUSH:
-                        dst++;
-                        goto again;
-                case 0:
-                case UNVIS_NOCHAR:
-                        break;
-                default:
-                        return (-1);
-                }
-        }
-        if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
-                dst++;
-        *dst = '\0';
-        return (dst - start);
-}
-
-int
-strunvisx(char *dst, const char *src, int flag)
-{
-        char c;
-        char *start = dst;
-        int state = 0;
-    
-        while ( (c = *src++) ) {
-        again:
-                switch (unvis(dst, c, &state, flag)) {
-                case UNVIS_VALID:
-                        dst++;
-                        break;
-                case UNVIS_VALIDPUSH:
-                        dst++;
-                        goto again;
-                case 0:
-                case UNVIS_NOCHAR:
-                        break;
-                default:
-                        return (-1);
-                }
-        }
-        if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
-                dst++;
-        *dst = '\0';
-        return (dst - start);
-}

cvis/unvis.go

@@ -1,22 +0,0 @@
-package cvis
-
-// #include "vis.h"
-// #include <stdlib.h>
-import "C"
-import (
-	"fmt"
-	"unsafe"
-)
-
-// Unvis decodes the Vis() string encoding
-func Unvis(src string) (string, error) {
-	cDst, cSrc := C.CString(string(make([]byte, len(src)+1))), C.CString(src)
-	defer C.free(unsafe.Pointer(cDst))
-	defer C.free(unsafe.Pointer(cSrc))
-	ret := C.strunvis(cDst, cSrc)
-	// TODO(vbatts) this needs to be confirmed against UnvisError
-	if ret == -1 {
-		return "", fmt.Errorf("failed to decode: %q", src)
-	}
-	return C.GoString(cDst), nil
-}

cvis/vis.c

@@ -1,202 +0,0 @@
-/*-
- * Copyright (c) 1989, 1993
- *      The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)vis.c       8.1 (Berkeley) 7/19/93";
-#endif /* LIBC_SCCS and not lint */
-
-
-#include <sys/cdefs.h>
-
-#include <sys/types.h>
-#include <limits.h>
-#include <ctype.h>
-#include <stdio.h>
-#include "vis.h"
-
-#define isoctal(c)      (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
-
-/*
- * vis - visually encode characters
- */
-char *
-vis(dst, c, flag, nextc)
-        char *dst;
-        int c, nextc;
-        int flag;
-{
-        c = (unsigned char)c;
-
-        if (flag & VIS_HTTPSTYLE) {
-                /* Described in RFC 1808 */
-                if (!(isalnum(c) /* alpha-numeric */
-                    /* safe */
-                    || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
-                    /* extra */
-                    || c == '!' || c == '*' || c == '\'' || c == '('
-                    || c == ')' || c == ',')) {
-                        *dst++ = '%';
-                        snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
-                        dst += 2;
-                        goto done;
-                }
-        }
-
-        if ((flag & VIS_GLOB) &&
-            (c == '*' || c == '?' || c == '[' || c == '#'))
-                ;
-        else if (isgraph(c) ||
-           ((flag & VIS_SP) == 0 && c == ' ') ||
-           ((flag & VIS_TAB) == 0 && c == '\t') ||
-           ((flag & VIS_NL) == 0 && c == '\n') ||
-           ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
-                *dst++ = c;
-                if (c == '\\' && (flag & VIS_NOSLASH) == 0)
-                        *dst++ = '\\';
-                *dst = '\0';
-                return (dst);
-        }
-
-        if (flag & VIS_CSTYLE) {
-                switch(c) {
-                case '\n':
-                        *dst++ = '\\';
-                        *dst++ = 'n';
-                        goto done;
-                case '\r':
-                        *dst++ = '\\';
-                        *dst++ = 'r';
-                        goto done;
-                case '\b':
-                        *dst++ = '\\';
-                        *dst++ = 'b';
-                        goto done;
-                case '\a':
-                        *dst++ = '\\';
-                        *dst++ = 'a';
-                        goto done;
-                case '\v':
-                        *dst++ = '\\';
-                        *dst++ = 'v';
-                        goto done;
-                case '\t':
-                        *dst++ = '\\';
-                        *dst++ = 't';
-                        goto done;
-                case '\f':
-                        *dst++ = '\\';
-                        *dst++ = 'f';
-                        goto done;
-                case ' ':
-                        *dst++ = '\\';
-                        *dst++ = 's';
-                        goto done;
-                case '\0':
-                        *dst++ = '\\';
-                        *dst++ = '0';
-                        if (isoctal(nextc)) {
-                                *dst++ = '0';
-                                *dst++ = '0';
-                        }
-                        goto done;
-                }
-        }
-        if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
-                *dst++ = '\\';
-                *dst++ = ((u_char)c >> 6 & 07) + '0';
-                *dst++ = ((u_char)c >> 3 & 07) + '0';
-                *dst++ = ((u_char)c & 07) + '0';
-                goto done;
-        }
-        if ((flag & VIS_NOSLASH) == 0)
-                *dst++ = '\\';
-        if (c & 0200) {
-                c &= 0177;
-                *dst++ = 'M';
-        }
-        if (iscntrl(c)) {
-                *dst++ = '^';
-                if (c == 0177)
-                        *dst++ = '?';
-                else
-                        *dst++ = c + '@';
-        } else {
-                *dst++ = '-';
-                *dst++ = c;
-        }
-done:
-        *dst = '\0';
-        return (dst);
-}
-
-/*
- * strvis, strvisx - visually encode characters from src into dst
- *
- *      Dst must be 4 times the size of src to account for possible
- *      expansion.  The length of dst, not including the trailing NUL,
- *      is returned.
- *
- *      Strvisx encodes exactly len bytes from src into dst.
- *      This is useful for encoding a block of data.
- */
-int
-strvis(dst, src, flag)
-        char *dst;
-        const char *src;
-        int flag;
-{
-        char c;
-        char *start;
-
-        for (start = dst; (c = *src); )
-                dst = vis(dst, c, flag, *++src);
-        *dst = '\0';
-        return (dst - start);
-}
-
-int
-strvisx(dst, src, len, flag)
-        char *dst;
-        const char *src;
-        size_t len;
-        int flag;
-{
-        int c;
-        char *start;
-
-        for (start = dst; len > 1; len--) {
-                c = *src;
-                dst = vis(dst, c, flag, *++src);
-        }
-        if (len)
-                dst = vis(dst, *src, flag, '\0');
-        *dst = '\0';
-
-        return (dst - start);
-}

cvis/vis.go

@@ -1,28 +0,0 @@
-package cvis
-
-// #include "vis.h"
-// #include <stdlib.h>
-import "C"
-import (
-	"fmt"
-	"math"
-	"unsafe"
-)
-
-// Vis is a wrapper around the C implementation
-func Vis(src string, flags int) (string, error) {
-	// dst needs to be 4 times the length of str, must check appropriate size
-	if uint32(len(src)*4+1) >= math.MaxUint32/4 {
-		return "", fmt.Errorf("failed to encode: %q", src)
-	}
-	dst := string(make([]byte, 4*len(src)+1))
-	cDst, cSrc := C.CString(dst), C.CString(src)
-	defer C.free(unsafe.Pointer(cDst))
-	defer C.free(unsafe.Pointer(cSrc))
-	C.strvis(cDst, cSrc, C.int(flags))
-
-	return C.GoString(cDst), nil
-}
-
-// DefaultVisFlags are the common flags used in mtree string encoding
-var DefaultVisFlags = C.VIS_WHITE | C.VIS_OCTAL | C.VIS_GLOB

cvis/vis.h

@@ -1,90 +0,0 @@
-/*-
- * Copyright (c) 1990, 1993
- *      The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the University of
- *      California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *      @(#)vis.h       8.1 (Berkeley) 6/2/93
- * $FreeBSD$
- */
-
-#ifndef _VIS_H_
-#define _VIS_H_
-
-#include <sys/types.h>
-
-/*
- * to select alternate encoding format
- */
-#define VIS_OCTAL       0x01    /* use octal \ddd format */
-#define VIS_CSTYLE      0x02    /* use \[nrft0..] where appropriate */
-
-/*
- * to alter set of characters encoded (default is to encode all
- * non-graphic except space, tab, and newline).
- */
-#define VIS_SP          0x04    /* also encode space */
-#define VIS_TAB         0x08    /* also encode tab */
-#define VIS_NL          0x10    /* also encode newline */
-#define VIS_WHITE       (VIS_SP | VIS_TAB | VIS_NL)
-#define VIS_SAFE        0x20    /* only encode "unsafe" characters */
-
-/*
- * other
- */
-#define VIS_NOSLASH     0x40    /* inhibit printing '\' */
-#define VIS_HTTPSTYLE   0x80    /* http-style escape % HEX HEX */
-#define VIS_GLOB        0x100   /* encode glob(3) magics */
-
-/*
- * unvis return codes
- */
-#define UNVIS_VALID      1      /* character valid */
-#define UNVIS_VALIDPUSH  2      /* character valid, push back passed char */
-#define UNVIS_NOCHAR     3      /* valid sequence, no character produced */
-#define UNVIS_SYNBAD    -1      /* unrecognized escape sequence */
-#define UNVIS_ERROR     -2      /* decoder in unknown state (unrecoverable) */
-
-/*
- * unvis flags
- */
-#define UNVIS_END       1       /* no more characters */
-
-#include <sys/cdefs.h>
-
-__BEGIN_DECLS
-char    *vis(char *, int, int, int);
-int     strvis(char *, const char *, int);
-int     strvisx(char *, const char *, size_t, int);
-int     strunvis(char *, const char *);
-int     strunvisx(char *, const char *, int);
-int     unvis(char *, int, int *, int);
-__END_DECLS
-
-#endif /* !_VIS_H_ */

debug.go

@@ -1,18 +0,0 @@
-package mtree
-
-import (
-	"fmt"
-	"os"
-	"time"
-)
-
-// DebugOutput is the where DEBUG output is written
-var DebugOutput = os.Stderr
-
-// Debugf does formatted output to DebugOutput, only if DEBUG environment variable is set
-func Debugf(format string, a ...interface{}) (n int, err error) {
-	if os.Getenv("DEBUG") != "" {
-		return fmt.Fprintf(DebugOutput, "[%d] [DEBUG] %s\n", time.Now().UnixNano(), fmt.Sprintf(format, a...))
-	}
-	return 0, nil
-}

entry.go

@@ -2,8 +2,11 @@ package mtree
 
 import (
 	"fmt"
+	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/vbatts/go-mtree/pkg/govis"
 )
 
 type byPos []Entry
@@ -47,7 +50,7 @@ func (e Entry) Descend(filename string) *Entry {
 func (e Entry) Find(filepath string) *Entry {
 	resultnode := &e
 	for _, path := range strings.Split(filepath, "/") {
-		encoded, err := Vis(path, DefaultVisFlags)
+		encoded, err := govis.Vis(path, DefaultVisFlags)
 		if err != nil {
 			return nil
 		}
@@ -65,21 +68,55 @@ func (e Entry) Ascend() *Entry {
 	return e.Parent
 }
 
+// CleanPath makes a path safe for use with filepath.Join. This is done by not
+// only cleaning the path, but also (if the path is relative) adding a leading
+// '/' and cleaning it (then removing the leading '/'). This ensures that a
+// path resulting from prepending another path will always resolve to lexically
+// be a subdirectory of the prefixed path. This is all done lexically, so paths
+// that include symlinks won't be safe as a result of using CleanPath.
+//
+// This code was copied from runc/libcontainer/utils/utils.go. It was
+// originally written by myself, so I am dual-licensing it for the purpose of
+// this project.
+func CleanPath(path string) string {
+	// Deal with empty strings nicely.
+	if path == "" {
+		return ""
+	}
+
+	// Ensure that all paths are cleaned (especially problematic ones like
+	// "/../../../../../" which can cause lots of issues).
+	path = filepath.Clean(path)
+
+	// If the path isn't absolute, we need to do more processing to fix paths
+	// such as "../../../../<etc>/some/path". We also shouldn't convert absolute
+	// paths to relative ones.
+	if !filepath.IsAbs(path) {
+		path = filepath.Clean(string(os.PathSeparator) + path)
+		// This can't fail, as (by definition) all paths are relative to root.
+		path, _ = filepath.Rel(string(os.PathSeparator), path)
+	}
+
+	// Clean the path again for good measure.
+	return filepath.Clean(path)
+}
+
 // Path provides the full path of the file, despite RelativeType or FullType. It
 // will be in Unvis'd form.
 func (e Entry) Path() (string, error) {
-	decodedName, err := Unvis(e.Name)
+	decodedName, err := govis.Unvis(e.Name, DefaultVisFlags)
 	if err != nil {
 		return "", err
 	}
+	decodedName = CleanPath(decodedName)
 	if e.Parent == nil || e.Type == FullType {
-		return filepath.Clean(decodedName), nil
+		return decodedName, nil
 	}
 	parentName, err := e.Parent.Path()
 	if err != nil {
 		return "", err
 	}
-	return filepath.Clean(filepath.Join(parentName, decodedName)), nil
+	return CleanPath(filepath.Join(parentName, decodedName)), nil
 }
 
 // String joins a file with its associated keywords. The file name will be the
@@ -110,6 +147,16 @@ func (e Entry) AllKeys() []KeyVal {
 	return e.Keywords
 }
 
+// IsDir checks the type= value for this entry on whether it is a directory
+func (e Entry) IsDir() bool {
+	for _, kv := range e.AllKeys() {
+		if kv.Keyword().Prefix() == "type" {
+			return kv.Value() == "dir"
+		}
+	}
+	return false
+}
+
 // EntryType are the formats of lines in an mtree spec file
 type EntryType int
 

fseval_test.go

@@ -1,6 +1,7 @@
 package mtree
 
 import (
+	"encoding/json"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -8,7 +9,7 @@ import (
 	"time"
 )
 
-var mockTime = time.Unix(1337888823, 88288518233)
+var mockTime = time.Unix(1337888823, 0)
 
 // Here be some dodgy testing. In particular, we have to mess around with some
 // of the FsEval functions. In particular, we change all of the FileInfos to a
@@ -155,6 +156,11 @@ func TestCheckFsEval(t *testing.T) {
 		t.Fatal(err)
 	}
 	if len(res) > 0 {
-		t.Errorf("%#v", res)
+		buf, err := json.MarshalIndent(res, "", "  ")
+		if err != nil {
+			t.Errorf("%#v", res)
+		} else {
+			t.Errorf("%s", buf)
+		}
 	}
 }

glide.lock

@@ -1,8 +0,0 @@
-hash: 90db837f2d27de645d9f48fa1be54b4f9d83f0cb9343ce98fa61e1b55b2828b5
-updated: 2017-01-19T17:18:33.464668206-05:00
-imports:
-- name: golang.org/x/crypto
-  version: b8a2a83acfe6e6770b75de42d5ff4c67596675c0
-  subpackages:
-  - ripemd160
-testImports: []

glide.yaml

@@ -1,8 +0,0 @@
-package: github.com/vbatts/go-mtree
-homepage: https://github.com/vbatts/go-mtree
-license: BSD-3-Clause
-description: File systems verification utility and library, in likeness of mtree(8)
-import:
-- package: golang.org/x/crypto
-  subpackages:
-  - ripemd160

go.mod

@@ -0,0 +1,11 @@
+module github.com/vbatts/go-mtree
+
+go 1.13
+
+require (
+	github.com/davecgh/go-spew v1.1.1
+	github.com/fatih/color v1.12.0 // indirect
+	github.com/sirupsen/logrus v1.7.0
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
+)

go.sum

@@ -0,0 +1,26 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
+github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
+github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.7.0 h1:ShrD1U9pZB12TX0cVy0DtePoCH97K8EtX+mg7ZARUtM=
+github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

hierarchy.go

@@ -36,7 +36,7 @@ func (dh DirectoryHierarchy) UsedKeywords() []Keyword {
 			if e.Type != SpecialType || e.Name == "/set" {
 				kvs := e.Keywords
 				for _, kv := range kvs {
-					kw := KeyVal(kv).Keyword()
+					kw := KeyVal(kv).Keyword().Prefix()
 					if !InKeywordSlice(kw, usedkeywords) {
 						usedkeywords = append(usedkeywords, KeywordSynonym(string(kw)))
 					}

hierarchy_test.go

@@ -20,6 +20,19 @@ var checklist = []struct {
   .COMMIT_EDITMSG.un~ size=1006 mode=0644 time=1479325423.450468662 sha1digest=dead0face
   .TAG_EDITMSG.un~ size=1069 mode=0600 time=1471362316.801317529 sha256digest=dead0face
 `, set: []Keyword{"size", "mode", "time", "sha256digest"}},
+	{blob: `
+#          user: cyphar
+#       machine: ryuk
+#          tree: xattr
+#          date: Fri Sep 29 21:00:41 2017
+#      keywords: size,type,uid,gid,mode,link,nlink,time,xattr
+
+# .
+/set type=file nlink=1 mode=0664 uid=1000 gid=100 xattr.user.kira=SSdsbCB0YWtlIGEgcG90YXRvIGNoaXAuLi4gYW5kIGVhdCBpdCE=
+. size=8 type=dir mode=0755 time=1506666472.255992830
+    file size=0 mode=0644 time=1506666472.255992830 xattr.user.something=dGVzdA==
+..
+`, set: []Keyword{"size", "type", "uid", "gid", "mode", "nlink", "time", "xattr"}},
 }
 
 func TestUsedKeywords(t *testing.T) {

keywordfunc.go

@@ -11,6 +11,7 @@ import (
 	"io"
 	"os"
 
+	"github.com/vbatts/go-mtree/pkg/govis"
 	"golang.org/x/crypto/ripemd160"
 )
 
@@ -20,34 +21,37 @@ import (
 // io.Reader `r` is to the file stream for the file payload. While this
 // function takes an io.Reader, the caller needs to reset it to the beginning
 // for each new KeywordFunc
-type KeywordFunc func(path string, info os.FileInfo, r io.Reader) (KeyVal, error)
+type KeywordFunc func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error)
 
 var (
 	// KeywordFuncs is the map of all keywords (and the functions to produce them)
 	KeywordFuncs = map[Keyword]KeywordFunc{
-		"size":            sizeKeywordFunc,                                     // The size, in bytes, of the file
-		"type":            typeKeywordFunc,                                     // The type of the file
-		"time":            timeKeywordFunc,                                     // The last modification time of the file
-		"link":            linkKeywordFunc,                                     // The target of the symbolic link when type=link
-		"uid":             uidKeywordFunc,                                      // The file owner as a numeric value
-		"gid":             gidKeywordFunc,                                      // The file group as a numeric value
-		"nlink":           nlinkKeywordFunc,                                    // The number of hard links the file is expected to have
-		"uname":           unameKeywordFunc,                                    // The file owner as a symbolic name
-		"mode":            modeKeywordFunc,                                     // The current file's permissions as a numeric (octal) or symbolic value
-		"cksum":           cksumKeywordFunc,                                    // The checksum of the file using the default algorithm specified by the cksum(1) utility
-		"md5":             hasherKeywordFunc("md5digest", md5.New),             // The MD5 message digest of the file
-		"md5digest":       hasherKeywordFunc("md5digest", md5.New),             // A synonym for `md5`
-		"rmd160":          hasherKeywordFunc("ripemd160digest", ripemd160.New), // The RIPEMD160 message digest of the file
-		"rmd160digest":    hasherKeywordFunc("ripemd160digest", ripemd160.New), // A synonym for `rmd160`
-		"ripemd160digest": hasherKeywordFunc("ripemd160digest", ripemd160.New), // A synonym for `rmd160`
-		"sha1":            hasherKeywordFunc("sha1digest", sha1.New),           // The SHA1 message digest of the file
-		"sha1digest":      hasherKeywordFunc("sha1digest", sha1.New),           // A synonym for `sha1`
-		"sha256":          hasherKeywordFunc("sha256digest", sha256.New),       // The SHA256 message digest of the file
-		"sha256digest":    hasherKeywordFunc("sha256digest", sha256.New),       // A synonym for `sha256`
-		"sha384":          hasherKeywordFunc("sha384digest", sha512.New384),    // The SHA384 message digest of the file
-		"sha384digest":    hasherKeywordFunc("sha384digest", sha512.New384),    // A synonym for `sha384`
-		"sha512":          hasherKeywordFunc("sha512digest", sha512.New),       // The SHA512 message digest of the file
-		"sha512digest":    hasherKeywordFunc("sha512digest", sha512.New),       // A synonym for `sha512`
+		"size":            sizeKeywordFunc,                                      // The size, in bytes, of the file
+		"type":            typeKeywordFunc,                                      // The type of the file
+		"time":            timeKeywordFunc,                                      // The last modification time of the file
+		"link":            linkKeywordFunc,                                      // The target of the symbolic link when type=link
+		"uid":             uidKeywordFunc,                                       // The file owner as a numeric value
+		"gid":             gidKeywordFunc,                                       // The file group as a numeric value
+		"nlink":           nlinkKeywordFunc,                                     // The number of hard links the file is expected to have
+		"uname":           unameKeywordFunc,                                     // The file owner as a symbolic name
+		"gname":           gnameKeywordFunc,                                     // The file group as a symbolic name
+		"mode":            modeKeywordFunc,                                      // The current file's permissions as a numeric (octal) or symbolic value
+		"cksum":           cksumKeywordFunc,                                     // The checksum of the file using the default algorithm specified by the cksum(1) utility
+		"md5":             hasherKeywordFunc("md5digest", md5.New),              // The MD5 message digest of the file
+		"md5digest":       hasherKeywordFunc("md5digest", md5.New),              // A synonym for `md5`
+		"rmd160":          hasherKeywordFunc("ripemd160digest", ripemd160.New),  // The RIPEMD160 message digest of the file
+		"rmd160digest":    hasherKeywordFunc("ripemd160digest", ripemd160.New),  // A synonym for `rmd160`
+		"ripemd160digest": hasherKeywordFunc("ripemd160digest", ripemd160.New),  // A synonym for `rmd160`
+		"sha1":            hasherKeywordFunc("sha1digest", sha1.New),            // The SHA1 message digest of the file
+		"sha1digest":      hasherKeywordFunc("sha1digest", sha1.New),            // A synonym for `sha1`
+		"sha256":          hasherKeywordFunc("sha256digest", sha256.New),        // The SHA256 message digest of the file
+		"sha256digest":    hasherKeywordFunc("sha256digest", sha256.New),        // A synonym for `sha256`
+		"sha384":          hasherKeywordFunc("sha384digest", sha512.New384),     // The SHA384 message digest of the file
+		"sha384digest":    hasherKeywordFunc("sha384digest", sha512.New384),     // A synonym for `sha384`
+		"sha512":          hasherKeywordFunc("sha512digest", sha512.New),        // The SHA512 message digest of the file
+		"sha512digest":    hasherKeywordFunc("sha512digest", sha512.New),        // A synonym for `sha512`
+		"sha512256":       hasherKeywordFunc("sha512digest", sha512.New512_256), // The SHA512/256 message digest of the file
+		"sha512256digest": hasherKeywordFunc("sha512digest", sha512.New512_256), // A synonym for `sha512256`
 
 		"flags": flagsKeywordFunc, // NOTE: this is a noop, but here to support the presence of the "flags" keyword.
 
@@ -65,7 +69,7 @@ var (
 	}
 )
 var (
-	modeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	modeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		permissions := info.Mode().Perm()
 		if os.ModeSetuid&info.Mode() > 0 {
 			permissions |= (1 << 11)
@@ -76,93 +80,93 @@ var (
 		if os.ModeSticky&info.Mode() > 0 {
 			permissions |= (1 << 9)
 		}
-		return KeyVal(fmt.Sprintf("mode=%#o", permissions)), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("mode=%#o", permissions))}, nil
 	}
-	sizeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	sizeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if sys, ok := info.Sys().(*tar.Header); ok {
 			if sys.Typeflag == tar.TypeSymlink {
-				return KeyVal(fmt.Sprintf("size=%d", len(sys.Linkname))), nil
+				return []KeyVal{KeyVal(fmt.Sprintf("size=%d", len(sys.Linkname)))}, nil
 			}
 		}
-		return KeyVal(fmt.Sprintf("size=%d", info.Size())), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("size=%d", info.Size()))}, nil
 	}
-	cksumKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	cksumKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if !info.Mode().IsRegular() {
-			return emptyKV, nil
+			return nil, nil
 		}
 		sum, _, err := cksum(r)
 		if err != nil {
-			return emptyKV, err
+			return nil, err
 		}
-		return KeyVal(fmt.Sprintf("cksum=%d", sum)), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("cksum=%d", sum))}, nil
 	}
 	hasherKeywordFunc = func(name string, newHash func() hash.Hash) KeywordFunc {
-		return func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+		return func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 			if !info.Mode().IsRegular() {
-				return emptyKV, nil
+				return nil, nil
 			}
 			h := newHash()
 			if _, err := io.Copy(h, r); err != nil {
-				return emptyKV, err
+				return nil, err
 			}
-			return KeyVal(fmt.Sprintf("%s=%x", KeywordSynonym(name), h.Sum(nil))), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("%s=%x", KeywordSynonym(name), h.Sum(nil)))}, nil
 		}
 	}
-	tartimeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return KeyVal(fmt.Sprintf("tar_time=%d.%9.9d", info.ModTime().Unix(), 0)), nil
+	tartimeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return []KeyVal{KeyVal(fmt.Sprintf("tar_time=%d.%9.9d", info.ModTime().Unix(), 0))}, nil
 	}
-	timeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	timeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		tSec := info.ModTime().Unix()
 		tNano := info.ModTime().Nanosecond()
-		return KeyVal(fmt.Sprintf("time=%d.%9.9d", tSec, tNano)), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("time=%d.%9.9d", tSec, tNano))}, nil
 	}
-	linkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	linkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if sys, ok := info.Sys().(*tar.Header); ok {
 			if sys.Linkname != "" {
-				linkname, err := Vis(sys.Linkname, DefaultVisFlags)
+				linkname, err := govis.Vis(sys.Linkname, DefaultVisFlags)
 				if err != nil {
-					return emptyKV, err
+					return nil, nil
 				}
-				return KeyVal(fmt.Sprintf("link=%s", linkname)), nil
+				return []KeyVal{KeyVal(fmt.Sprintf("link=%s", linkname))}, nil
 			}
-			return emptyKV, nil
+			return nil, nil
 		}
 
 		if info.Mode()&os.ModeSymlink != 0 {
 			str, err := os.Readlink(path)
 			if err != nil {
-				return emptyKV, err
+				return nil, nil
 			}
-			linkname, err := Vis(str, DefaultVisFlags)
+			linkname, err := govis.Vis(str, DefaultVisFlags)
 			if err != nil {
-				return emptyKV, err
+				return nil, nil
 			}
-			return KeyVal(fmt.Sprintf("link=%s", linkname)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("link=%s", linkname))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	typeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	typeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if info.Mode().IsDir() {
-			return "type=dir", nil
+			return []KeyVal{"type=dir"}, nil
 		}
 		if info.Mode().IsRegular() {
-			return "type=file", nil
+			return []KeyVal{"type=file"}, nil
 		}
 		if info.Mode()&os.ModeSocket != 0 {
-			return "type=socket", nil
+			return []KeyVal{"type=socket"}, nil
 		}
 		if info.Mode()&os.ModeSymlink != 0 {
-			return "type=link", nil
+			return []KeyVal{"type=link"}, nil
 		}
 		if info.Mode()&os.ModeNamedPipe != 0 {
-			return "type=fifo", nil
+			return []KeyVal{"type=fifo"}, nil
 		}
 		if info.Mode()&os.ModeDevice != 0 {
 			if info.Mode()&os.ModeCharDevice != 0 {
-				return "type=char", nil
+				return []KeyVal{"type=char"}, nil
 			}
-			return "type=device", nil
+			return []KeyVal{"type=block"}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
 )

keywordfuncs_bsd.go

@@ -0,0 +1,69 @@
+// +build darwin freebsd netbsd openbsd
+
+package mtree
+
+import (
+	"archive/tar"
+	"fmt"
+	"io"
+	"os"
+	"os/user"
+	"syscall"
+)
+
+var (
+	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		// ideally this will pull in from here https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2
+		return nil, nil
+	}
+
+	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", hdr.Uname))}, nil
+		}
+
+		stat := info.Sys().(*syscall.Stat_t)
+		u, err := user.LookupId(fmt.Sprintf("%d", stat.Uid))
+		if err != nil {
+			return nil, err
+		}
+		return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", u.Username))}, nil
+	}
+	gnameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", hdr.Gname))}, nil
+		}
+
+		stat := info.Sys().(*syscall.Stat_t)
+		g, err := lookupGroupID(fmt.Sprintf("%d", stat.Gid))
+		if err != nil {
+			return nil, err
+		}
+		return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", g.Name))}, nil
+	}
+	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", hdr.Uid))}, nil
+		}
+		stat := info.Sys().(*syscall.Stat_t)
+		return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", stat.Uid))}, nil
+	}
+	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", hdr.Gid))}, nil
+		}
+		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", stat.Gid))}, nil
+		}
+		return nil, nil
+	}
+	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink))}, nil
+		}
+		return nil, nil
+	}
+	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return nil, nil
+	}
+)

keywordfuncs_linux.go

@@ -9,87 +9,99 @@ import (
 	"io"
 	"os"
 	"os/user"
-	"strings"
 	"syscall"
 
+	"github.com/vbatts/go-mtree/pkg/govis"
 	"github.com/vbatts/go-mtree/xattr"
 )
 
 var (
 	// this is bsd specific https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2
-	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return emptyKV, nil
+	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return nil, nil
 	}
 
-	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uname=%s", hdr.Uname)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", hdr.Uname))}, nil
 		}
 
 		stat := info.Sys().(*syscall.Stat_t)
 		u, err := user.LookupId(fmt.Sprintf("%d", stat.Uid))
 		if err != nil {
-			return emptyKV, err
+			return nil, nil
 		}
-		return KeyVal(fmt.Sprintf("uname=%s", u.Username)), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", u.Username))}, nil
 	}
-	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	gnameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uid=%d", hdr.Uid)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", hdr.Gname))}, nil
+		}
+
+		stat := info.Sys().(*syscall.Stat_t)
+		g, err := lookupGroupID(fmt.Sprintf("%d", stat.Gid))
+		if err != nil {
+			return nil, nil
+		}
+		return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", g.Name))}, nil
+	}
+	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", hdr.Uid))}, nil
 		}
 		stat := info.Sys().(*syscall.Stat_t)
-		return KeyVal(fmt.Sprintf("uid=%d", stat.Uid)), nil
+		return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", stat.Uid))}, nil
 	}
-	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("gid=%d", hdr.Gid)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", hdr.Gid))}, nil
 		}
 		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
-			return KeyVal(fmt.Sprintf("gid=%d", stat.Gid)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", stat.Gid))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
-			return KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
 			if len(hdr.Xattrs) == 0 {
-				return emptyKV, nil
+				return nil, nil
 			}
 			klist := []KeyVal{}
 			for k, v := range hdr.Xattrs {
-				encKey, err := Vis(k, DefaultVisFlags)
+				encKey, err := govis.Vis(k, DefaultVisFlags)
 				if err != nil {
-					return emptyKV, err
+					return nil, nil
 				}
 				klist = append(klist, KeyVal(fmt.Sprintf("xattr.%s=%s", encKey, base64.StdEncoding.EncodeToString([]byte(v)))))
 			}
-			return KeyVal(strings.Join(KeyValToString(klist), " ")), nil
+			return klist, nil
 		}
 		if !info.Mode().IsRegular() && !info.Mode().IsDir() {
-			return emptyKV, nil
+			return nil, nil
 		}
 
 		xlist, err := xattr.List(path)
 		if err != nil {
-			return emptyKV, err
+			return nil, nil
 		}
 		klist := make([]KeyVal, len(xlist))
 		for i := range xlist {
 			data, err := xattr.Get(path, xlist[i])
 			if err != nil {
-				return emptyKV, err
+				return nil, nil
 			}
-			encKey, err := Vis(xlist[i], DefaultVisFlags)
+			encKey, err := govis.Vis(xlist[i], DefaultVisFlags)
 			if err != nil {
-				return emptyKV, err
+				return nil, nil
 			}
 			klist[i] = KeyVal(fmt.Sprintf("xattr.%s=%s", encKey, base64.StdEncoding.EncodeToString(data)))
 		}
-		return KeyVal(strings.Join(KeyValToString(klist), " ")), nil
+		return klist, nil
 	}
 )

keywordfuncs_unsupported.go

@@ -11,31 +11,37 @@ import (
 
 var (
 	// this is bsd specific https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2
-	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return emptyKV, nil
+	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return nil, nil
 	}
-	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uname=%s", hdr.Uname)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", hdr.Uname))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	gnameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uid=%d", hdr.Uid)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", hdr.Gname))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
+	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
 		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("gid=%d", hdr.Gid)), nil
+			return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", hdr.Uid))}, nil
 		}
-		return emptyKV, nil
+		return nil, nil
 	}
-	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return emptyKV, nil
+	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		if hdr, ok := info.Sys().(*tar.Header); ok {
+			return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", hdr.Gid))}, nil
+		}
+		return nil, nil
 	}
-	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return emptyKV, nil
+	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return nil, nil
+	}
+	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
+		return nil, nil
 	}
 )

keywords.go

@@ -3,12 +3,40 @@ package mtree
 import (
 	"fmt"
 	"strings"
+
+	"github.com/vbatts/go-mtree/pkg/govis"
 )
 
+// DefaultVisFlags is the set of Vis flags used when encoding filenames and
+// other similar entries.
+const DefaultVisFlags govis.VisFlag = govis.VisWhite | govis.VisOctal | govis.VisGlob
+
 // Keyword is the string name of a keyword, with some convenience functions for
 // determining whether it is a default or bsd standard keyword.
+// It first portion before the "="
 type Keyword string
 
+// Prefix is the portion of the keyword before a first "." (if present).
+//
+// Primarly for the xattr use-case, where the keyword `xattr.security.selinux` would have a Suffix of `security.selinux`.
+func (k Keyword) Prefix() Keyword {
+	if strings.Contains(string(k), ".") {
+		return Keyword(strings.SplitN(string(k), ".", 2)[0])
+	}
+	return k
+}
+
+// Suffix is the portion of the keyword after a first ".".
+// This is an option feature.
+//
+// Primarly for the xattr use-case, where the keyword `xattr.security.selinux` would have a Suffix of `security.selinux`.
+func (k Keyword) Suffix() string {
+	if strings.Contains(string(k), ".") {
+		return strings.SplitN(string(k), ".", 2)[1]
+	}
+	return string(k)
+}
+
 // Default returns whether this keyword is in the default set of keywords
 func (k Keyword) Default() bool {
 	return InKeywordSlice(k, DefaultKeywords)
@@ -87,24 +115,7 @@ func (kv KeyVal) Keyword() Keyword {
 	if !strings.Contains(string(kv), "=") {
 		return Keyword("")
 	}
-	chunks := strings.SplitN(strings.TrimSpace(string(kv)), "=", 2)[0]
-	if !strings.Contains(chunks, ".") {
-		return Keyword(chunks)
-	}
-	return Keyword(strings.SplitN(chunks, ".", 2)[0])
-}
-
-// KeywordSuffix is really only used for xattr, as the keyword is a prefix to
-// the xattr "namespace.key"
-func (kv KeyVal) KeywordSuffix() string {
-	if !strings.Contains(string(kv), "=") {
-		return ""
-	}
-	chunks := strings.SplitN(strings.TrimSpace(string(kv)), "=", 2)[0]
-	if !strings.Contains(chunks, ".") {
-		return ""
-	}
-	return strings.SplitN(chunks, ".", 2)[1]
+	return Keyword(strings.SplitN(strings.TrimSpace(string(kv)), "=", 2)[0])
 }
 
 // Value is the data/value portion of "keyword=value"
@@ -115,25 +126,34 @@ func (kv KeyVal) Value() string {
 	return strings.SplitN(strings.TrimSpace(string(kv)), "=", 2)[1]
 }
 
-// ChangeValue changes the value of a KeyVal
-func (kv KeyVal) ChangeValue(newval string) string {
-	return fmt.Sprintf("%s=%s", kv.Keyword(), newval)
+// NewValue returns a new KeyVal with the newval
+func (kv KeyVal) NewValue(newval string) KeyVal {
+	return KeyVal(fmt.Sprintf("%s=%s", kv.Keyword(), newval))
 }
 
-// KeyValEqual returns whether two KeyVal are equivalent. This takes
+// Equal returns whether two KeyVal are equivalent. This takes
 // care of certain odd cases such as tar_mtime, and should be used over
 // using == comparisons directly unless you really know what you're
 // doing.
-func KeyValEqual(a, b KeyVal) bool {
+func (kv KeyVal) Equal(b KeyVal) bool {
 	// TODO: Implement handling of tar_mtime.
-	return a.Keyword() == b.Keyword() && a.Value() == b.Value()
+	return kv.Keyword() == b.Keyword() && kv.Value() == b.Value()
 }
 
-// keyvalSelector takes an array of KeyVal ("keyword=value") and filters out that only the set of keywords
+func keywordPrefixes(kvset []Keyword) []Keyword {
+	kvs := []Keyword{}
+	for _, kv := range kvset {
+		kvs = append(kvs, kv.Prefix())
+	}
+	return kvs
+}
+
+// keyvalSelector takes an array of KeyVal ("keyword=value") and filters out
+// that only the set of keywords
 func keyvalSelector(keyval []KeyVal, keyset []Keyword) []KeyVal {
 	retList := []KeyVal{}
 	for _, kv := range keyval {
-		if InKeywordSlice(kv.Keyword(), keyset) {
+		if InKeywordSlice(kv.Keyword().Prefix(), keywordPrefixes(keyset)) {
 			retList = append(retList, kv)
 		}
 	}
@@ -162,23 +182,23 @@ func keyValCopy(set []KeyVal) []KeyVal {
 
 // Has the "keyword" present in the list of KeyVal, and returns the
 // corresponding KeyVal, else an empty string.
-func Has(keyvals []KeyVal, keyword string) KeyVal {
+func Has(keyvals []KeyVal, keyword string) []KeyVal {
 	return HasKeyword(keyvals, Keyword(keyword))
 }
 
 // HasKeyword the "keyword" present in the list of KeyVal, and returns the
 // corresponding KeyVal, else an empty string.
-func HasKeyword(keyvals []KeyVal, keyword Keyword) KeyVal {
+// This match is done on the Prefix of the keyword only.
+func HasKeyword(keyvals []KeyVal, keyword Keyword) []KeyVal {
+	kvs := []KeyVal{}
 	for i := range keyvals {
-		if keyvals[i].Keyword() == keyword {
-			return keyvals[i]
+		if keyvals[i].Keyword().Prefix() == keyword.Prefix() {
+			kvs = append(kvs, keyvals[i])
 		}
 	}
-	return emptyKV
+	return kvs
 }
 
-var emptyKV = KeyVal("")
-
 // MergeSet takes the current setKeyVals, and then applies the entryKeyVals
 // such that the entry's values win. The union is returned.
 func MergeSet(setKeyVals, entryKeyVals []string) []KeyVal {
@@ -194,8 +214,11 @@ func MergeKeyValSet(setKeyVals, entryKeyVals []KeyVal) []KeyVal {
 	seenKeywords := []Keyword{}
 	for i := range retList {
 		word := retList[i].Keyword()
-		if ekv := HasKeyword(entryKeyVals, word); ekv != emptyKV {
-			retList[i] = ekv
+		for _, kv := range HasKeyword(entryKeyVals, word) {
+			// match on the keyword prefix and suffix here
+			if kv.Keyword() == word {
+				retList[i] = kv
+			}
 		}
 		seenKeywords = append(seenKeywords, word)
 	}
@@ -236,7 +259,6 @@ var (
 	// BsdKeywords is the set of keywords that is only in the upstream FreeBSD mtree
 	BsdKeywords = []Keyword{
 		"cksum",
-		"device",
 		"flags", // this one is really mostly BSD specific ...
 		"ignore",
 		"gid",
@@ -294,6 +316,8 @@ func KeywordSynonym(name string) Keyword {
 		retname = "sha384digest"
 	case "sha512":
 		retname = "sha512digest"
+	case "sha512256":
+		retname = "sha512256digest"
 	case "xattrs":
 		retname = "xattr"
 	default:

keywords_bsd.go

@@ -1,57 +0,0 @@
-// +build darwin freebsd netbsd openbsd
-
-package mtree
-
-import (
-	"archive/tar"
-	"fmt"
-	"io"
-	"os"
-	"os/user"
-	"syscall"
-)
-
-var (
-	flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		// ideally this will pull in from here https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2
-		return emptyKV, nil
-	}
-
-	unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uname=%s", hdr.Uname)), nil
-		}
-
-		stat := info.Sys().(*syscall.Stat_t)
-		u, err := user.LookupId(fmt.Sprintf("%d", stat.Uid))
-		if err != nil {
-			return emptyKV, err
-		}
-		return KeyVal(fmt.Sprintf("uname=%s", u.Username)), nil
-	}
-	uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("uid=%d", hdr.Uid)), nil
-		}
-		stat := info.Sys().(*syscall.Stat_t)
-		return KeyVal(fmt.Sprintf("uid=%d", stat.Uid)), nil
-	}
-	gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		if hdr, ok := info.Sys().(*tar.Header); ok {
-			return KeyVal(fmt.Sprintf("gid=%d", hdr.Gid)), nil
-		}
-		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
-			return KeyVal(fmt.Sprintf("gid=%d", stat.Gid)), nil
-		}
-		return emptyKV, nil
-	}
-	nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		if stat, ok := info.Sys().(*syscall.Stat_t); ok {
-			return KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink)), nil
-		}
-		return emptyKV, nil
-	}
-	xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
-		return emptyKV, nil
-	}
-)

keywords_linux_test.go

@@ -13,9 +13,14 @@ import (
 )
 
 func TestXattr(t *testing.T) {
-	// a bit dirty to create/destory a directory in cwd, but often /tmp is
-	// mounted tmpfs and doesn't support xattrs
-	dir, err := ioutil.TempDir(".", "test.xattrs.")
+	testDir, present := os.LookupEnv("MTREE_TESTDIR")
+	if present == false {
+		// a bit dirty to create/destory a directory in cwd,
+		// but often /tmp is mounted tmpfs and doesn't support
+		// xattrs
+		testDir = "."
+	}
+	dir, err := ioutil.TempDir(testDir, "test.xattrs.")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -46,12 +51,12 @@ func TestXattr(t *testing.T) {
 		t.Fatal(err)
 	}
 	// Check the directory
-	str, err := xattrKeywordFunc(dir, dirstat, nil)
+	kvs, err := xattrKeywordFunc(dir, dirstat, nil)
 	if err != nil {
 		t.Error(err)
 	}
-	if str == "" {
-		t.Errorf("expected a keyval; got %q", str)
+	if len(kvs) == 0 {
+		t.Errorf("expected a keyval; got none")
 	}
 
 	filestat, err := fh.Stat()
@@ -59,12 +64,12 @@ func TestXattr(t *testing.T) {
 		t.Fatal(err)
 	}
 	// Check the regular file
-	str, err = xattrKeywordFunc(filepath.Join(dir, "file"), filestat, fh)
+	kvs, err = xattrKeywordFunc(filepath.Join(dir, "file"), filestat, fh)
 	if err != nil {
 		t.Error(err)
 	}
-	if str == "" {
-		t.Errorf("expected a keyval; got %q", str)
+	if len(kvs) == 0 {
+		t.Errorf("expected a keyval; got none")
 	}
 
 	linkstat, err := os.Lstat(filepath.Join(dir, "symlink"))

keywords_test.go

@@ -7,6 +7,47 @@ import (
 	"time"
 )
 
+func TestKeyValRoundtrip(t *testing.T) {
+	kv := KeyVal("xattr.security.selinux=dW5jb25maW5lZF91Om9iamVjdF9yOnVzZXJfaG9tZV90OnMwAA==")
+	expected := "xattr.security.selinux"
+	got := string(kv.Keyword())
+	if got != expected {
+		t.Errorf("expected %q; got %q", expected, got)
+	}
+
+	expected = "xattr"
+	got = string(kv.Keyword().Prefix())
+	if got != expected {
+		t.Errorf("expected %q; got %q", expected, got)
+	}
+
+	expected = "security.selinux"
+	got = kv.Keyword().Suffix()
+	if got != expected {
+		t.Errorf("expected %q; got %q", expected, got)
+	}
+
+	expected = "dW5jb25maW5lZF91Om9iamVjdF9yOnVzZXJfaG9tZV90OnMwAA=="
+	got = kv.Value()
+	if got != expected {
+		t.Errorf("expected %q; got %q", expected, got)
+	}
+
+	expected = "xattr.security.selinux=farts"
+	got = string(kv.NewValue("farts"))
+	if got != expected {
+		t.Errorf("expected %q; got %q", expected, got)
+	}
+
+	expected = "xattr.security.selinux=farts"
+	kv1 := KeyVal(got)
+	kv2 := kv.NewValue("farts")
+	if !kv2.Equal(kv1) {
+		t.Errorf("expected equality of %q and %q", kv1, kv2)
+	}
+
+}
+
 type fakeFileInfo struct {
 	mtime time.Time
 }
@@ -61,8 +102,11 @@ func TestKeywordsTimeNano(t *testing.T) {
 		if err != nil {
 			t.Errorf("unexpected error while parsing '%q': %q", mtime, err)
 		}
-		if expected != got {
-			t.Errorf("keyword didn't match, expected '%s' got '%s'", expected, got)
+		if len(got) != 1 {
+			t.Errorf("expected 1 KeyVal, but got %d", len(got))
+		}
+		if expected != got[0] {
+			t.Errorf("keyword didn't match, expected '%s' got '%s'", expected, got[0])
 		}
 	}
 }
@@ -88,8 +132,11 @@ func TestKeywordsTimeTar(t *testing.T) {
 		if err != nil {
 			t.Errorf("unexpected error while parsing '%q': %q", mtime, err)
 		}
-		if expected != got {
-			t.Errorf("keyword didn't match, expected '%s' got '%s'", expected, got)
+		if len(got) != 1 {
+			t.Errorf("expected 1 KeyVal, but got %d", len(got))
+		}
+		if expected != got[0] {
+			t.Errorf("keyword didn't match, expected '%s' got '%s'", expected, got[0])
 		}
 	}
 }

lchtimes_unix.go

@@ -0,0 +1,22 @@
+// +build darwin dragonfly freebsd openbsd linux netbsd solaris
+
+package mtree
+
+import (
+	"os"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func lchtimes(name string, atime time.Time, mtime time.Time) error {
+	utimes := []unix.Timespec{
+		unix.NsecToTimespec(atime.UnixNano()),
+		unix.NsecToTimespec(mtime.UnixNano()),
+	}
+	if e := unix.UtimesNanoAt(unix.AT_FDCWD, name, utimes, unix.AT_SYMLINK_NOFOLLOW); e != nil {
+		return &os.PathError{Op: "chtimes", Path: name, Err: e}
+	}
+	return nil
+
+}

lchtimes_unsupported.go

@@ -0,0 +1,11 @@
+// +build windows
+
+package mtree
+
+import (
+	"time"
+)
+
+func lchtimes(name string, atime time.Time, mtime time.Time) error {
+	return nil
+}

lookup_new.go

@@ -0,0 +1,9 @@
+// +build go1.7
+
+package mtree
+
+import (
+	"os/user"
+)
+
+var lookupGroupID = user.LookupGroupId

lookup_old.go

@@ -0,0 +1,102 @@
+// +build !go1.7
+
+package mtree
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const groupFile = "/etc/group"
+
+var colon = []byte{':'}
+
+// Group represents a grouping of users.
+//
+// On POSIX systems Gid contains a decimal number representing the group ID.
+type Group struct {
+	Gid  string // group ID
+	Name string // group name
+}
+
+func lookupGroupID(id string) (*Group, error) {
+	f, err := os.Open(groupFile)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return findGroupID(id, f)
+}
+
+func findGroupID(id string, r io.Reader) (*Group, error) {
+	if v, err := readColonFile(r, matchGroupIndexValue(id, 2)); err != nil {
+		return nil, err
+	} else if v != nil {
+		return v.(*Group), nil
+	}
+	return nil, UnknownGroupIDError(id)
+}
+
+// lineFunc returns a value, an error, or (nil, nil) to skip the row.
+type lineFunc func(line []byte) (v interface{}, err error)
+
+// readColonFile parses r as an /etc/group or /etc/passwd style file, running
+// fn for each row. readColonFile returns a value, an error, or (nil, nil) if
+// the end of the file is reached without a match.
+func readColonFile(r io.Reader, fn lineFunc) (v interface{}, err error) {
+	bs := bufio.NewScanner(r)
+	for bs.Scan() {
+		line := bs.Bytes()
+		// There's no spec for /etc/passwd or /etc/group, but we try to follow
+		// the same rules as the glibc parser, which allows comments and blank
+		// space at the beginning of a line.
+		line = bytes.TrimSpace(line)
+		if len(line) == 0 || line[0] == '#' {
+			continue
+		}
+		v, err = fn(line)
+		if v != nil || err != nil {
+			return
+		}
+	}
+	return nil, bs.Err()
+}
+
+func matchGroupIndexValue(value string, idx int) lineFunc {
+	var leadColon string
+	if idx > 0 {
+		leadColon = ":"
+	}
+	substr := []byte(leadColon + value + ":")
+	return func(line []byte) (v interface{}, err error) {
+		if !bytes.Contains(line, substr) || bytes.Count(line, colon) < 3 {
+			return
+		}
+		// wheel:*:0:root
+		parts := strings.SplitN(string(line), ":", 4)
+		if len(parts) < 4 || parts[0] == "" || parts[idx] != value ||
+			// If the file contains +foo and you search for "foo", glibc
+			// returns an "invalid argument" error. Similarly, if you search
+			// for a gid for a row where the group name starts with "+" or "-",
+			// glibc fails to find the record.
+			parts[0][0] == '+' || parts[0][0] == '-' {
+			return
+		}
+		if _, err := strconv.Atoi(parts[2]); err != nil {
+			return nil, nil
+		}
+		return &Group{Name: parts[0], Gid: parts[2]}, nil
+	}
+}
+
+// UnknownGroupIDError is returned by LookupGroupId when
+// a group cannot be found.
+type UnknownGroupIDError string
+
+func (e UnknownGroupIDError) Error() string {
+	return "group: unknown groupid " + string(e)
+}

mtree_test.go

@@ -4,25 +4,48 @@ import (
 	"io/ioutil"
 	"os"
 	"testing"
+
+	"github.com/davecgh/go-spew/spew"
 )
 
 var (
-	testFiles  = []string{"testdata/source.mtree"}
-	numEntries = map[EntryType]int{
-		FullType:     0,
-		RelativeType: 45,
-		CommentType:  37,
-		SpecialType:  7,
-		DotDotType:   17,
-		BlankType:    34,
+	testFiles = []struct {
+		Name   string
+		Counts map[EntryType]int
+		Len    int64
+	}{
+		{
+			Name: "testdata/source.mtree",
+			Counts: map[EntryType]int{
+				FullType:     0,
+				RelativeType: 45,
+				CommentType:  37,
+				SpecialType:  7,
+				DotDotType:   17,
+				BlankType:    34,
+			},
+			Len: int64(7887),
+		},
+		{
+			Name: "testdata/source.casync-mtree",
+			Counts: map[EntryType]int{
+				FullType:     744,
+				RelativeType: 56,
+				CommentType:  37,
+				SpecialType:  7,
+				DotDotType:   17,
+				BlankType:    34,
+			},
+			Len: int64(168439),
+		},
 	}
-	expectedLength = int64(7887)
 )
 
 func TestParser(t *testing.T) {
-	for _, file := range testFiles {
+	for i, tf := range testFiles {
+		_ = i
 		func() {
-			fh, err := os.Open(file)
+			fh, err := os.Open(tf.Name)
 			if err != nil {
 				t.Error(err)
 				return
@@ -33,8 +56,17 @@ func TestParser(t *testing.T) {
 			if err != nil {
 				t.Error(err)
 			}
+
+			if i == 1 {
+				spew.Dump(dh)
+				//buf, err := xml.MarshalIndent(dh, "", "  ")
+				//if err == nil {
+				//t.Error(string(buf))
+				//}
+			}
+
 			gotNums := countTypes(dh)
-			for typ, num := range numEntries {
+			for typ, num := range tf.Counts {
 				if gNum, ok := gotNums[typ]; ok {
 					if num != gNum {
 						t.Errorf("for type %s: expected %d, got %d", typ, num, gNum)
@@ -46,8 +78,8 @@ func TestParser(t *testing.T) {
 			if err != nil {
 				t.Error(err)
 			}
-			if i != expectedLength {
-				t.Errorf("expected to write %d, but wrote %d", expectedLength, i)
+			if i != tf.Len {
+				t.Errorf("expected to write %d, but wrote %d", tf.Len, i)
 			}
 
 		}()

pkg/govis/COPYING

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
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+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

pkg/govis/README.md

@@ -0,0 +1,27 @@
+## `govis` ##
+
+`govis` is a BSD-compatible `vis(3)` and `unvis(3)` encoding implementation
+that is unicode aware and written in Go. None of this code comes from the
+original BSD code, nor does it come from `go-mtree`'s port of said code.
+Because 80s BSD code is not very nice to read.
+
+### License ###
+
+`govis` is licensed under the Apache 2.0 license.
+
+```
+govis: unicode aware vis(3) encoding implementation
+Copyright (C) 2017 SUSE LLC.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```

pkg/govis/govis.go

@@ -0,0 +1,39 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+// VisFlag manipulates how the characters are encoded/decoded
+type VisFlag uint
+
+// vis() has a variety of flags when deciding what encodings to use. While
+// mtree only uses one set of flags, implementing them all is necessary in
+// order to have compatibility with BSD's vis() and unvis() commands.
+const (
+	VisOctal     VisFlag = (1 << iota)     // VIS_OCTAL: Use octal \ddd format.
+	VisCStyle                              // VIS_CSTYLE: Use \[nrft0..] where appropriate.
+	VisSpace                               // VIS_SP: Also encode space.
+	VisTab                                 // VIS_TAB: Also encode tab.
+	VisNewline                             // VIS_NL: Also encode newline.
+	VisSafe                                // VIS_SAFE: Encode unsafe characters.
+	VisNoSlash                             // VIS_NOSLASH: Inhibit printing '\'.
+	VisHTTPStyle                           // VIS_HTTPSTYLE: HTTP-style escape %xx.
+	VisGlob                                // VIS_GLOB: Encode glob(3) magics.
+	visMask      VisFlag = (1 << iota) - 1 // Mask of all flags.
+
+	VisWhite VisFlag = (VisSpace | VisTab | VisNewline)
+)

pkg/govis/govis_test.go

@@ -0,0 +1,194 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+import (
+	"bytes"
+	"crypto/rand"
+	"testing"
+)
+
+const DefaultVisFlags = VisWhite | VisOctal | VisGlob
+
+func TestRandomVisUnvis(t *testing.T) {
+	// Randomly generate N strings.
+	const N = 100
+
+	for i := 0; i < N; i++ {
+		testBytes := make([]byte, 256)
+		if n, err := rand.Read(testBytes); n != cap(testBytes) || err != nil {
+			t.Fatalf("could not read enough bytes: err=%v n=%d", err, n)
+		}
+		test := string(testBytes)
+
+		for flag := VisFlag(0); flag <= visMask; flag++ {
+			// VisNoSlash is frankly just a dumb flag, and it is impossible for us
+			// to actually preserve things in a round-trip.
+			if flag&VisNoSlash == VisNoSlash {
+				continue
+			}
+
+			enc, err := Vis(test, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
+				continue
+			}
+			dec, err := Unvis(enc, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing unvis(%q, %b): %s", enc, flag, err)
+				continue
+			}
+			if dec != test {
+				t.Errorf("roundtrip failed: unvis(vis(%q, %b) = %q, %b) = %q", test, flag, enc, flag, dec)
+			}
+		}
+	}
+}
+
+func TestRandomVisVisUnvisUnvis(t *testing.T) {
+	// Randomly generate N strings.
+	const N = 100
+
+	for i := 0; i < N; i++ {
+		testBytes := make([]byte, 256)
+		if n, err := rand.Read(testBytes); n != cap(testBytes) || err != nil {
+			t.Fatalf("could not read enough bytes: err=%v n=%d", err, n)
+		}
+		test := string(testBytes)
+
+		for flag := VisFlag(0); flag <= visMask; flag++ {
+			// VisNoSlash is frankly just a dumb flag, and it is impossible for us
+			// to actually preserve things in a round-trip.
+			if flag&VisNoSlash == VisNoSlash {
+				continue
+			}
+
+			enc, err := Vis(test, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
+				continue
+			}
+			enc2, err := Vis(enc, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing vis(%q, %b): %s", enc, flag, err)
+				continue
+			}
+			dec, err := Unvis(enc2, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing unvis(%q, %b): %s", enc2, flag, err)
+				continue
+			}
+			dec2, err := Unvis(dec, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing unvis(%q, %b): %s", dec, flag, err)
+				continue
+			}
+			if dec2 != test {
+				t.Errorf("roundtrip failed: unvis(unvis(vis(vis(%q) = %q) = %q) = %q, %b) = %q", test, enc, enc2, dec, flag, dec2)
+			}
+		}
+	}
+}
+
+func TestVisUnvis(t *testing.T) {
+	for flag := VisFlag(0); flag <= visMask; flag++ {
+		// VisNoSlash is frankly just a dumb flag, and it is impossible for us
+		// to actually preserve things in a round-trip.
+		if flag&VisNoSlash == VisNoSlash {
+			continue
+		}
+
+		// Round-trip testing.
+		for _, test := range []string{
+			"",
+			"hello world",
+			"THIS\\IS_A_TEST1234",
+			"this.is.a.normal_string",
+			"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem",
+			"NetLock_Arany_=Class_Gold=_F\u0151tan\u00fas\u00edtv\u00e1ny.pem",
+			"T\u00dcB\u0130TAK_UEKAE_K\u00f6k_Sertifika_Hizmet_Sa\u011flay\u0131c\u0131s\u0131_-_S\u00fcr\u00fcm_3.pem",
+			"hello world [ this string needs=enco ding! ]",
+			"even \n more encoding necessary\a\a ",
+			"\024 <-- some more weird characters --> \u4f60\u597d\uff0c\u4e16\u754c",
+			"\\xff\\n double encoding is also great fun \\x",
+			"AC_Ra\\M-C\\M--z_Certic\\M-C\\M-!mara_S.A..pem",
+			"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084",
+			`z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`,
+			"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c",
+			"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb",
+			`62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`,
+			"\u9003\"9v1)T798|o;fly jnKX\u0489Be=",
+			`\M-i\M^@\M^C"9v1)T798|o;fly jnKX\M-R\M^IBe=`,
+			"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b",
+			`'3Ze\M-T\M^N|\M-K\M^^l\M-Z\M^]u-Rpct4+Z5b={@_{b`,
+			"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h",
+			`1%C3%86%C2%ABTcz+Vda%3F)k1%25%5C%22P%3B%60po%60h`,
+		} {
+			enc, err := Vis(test, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
+				continue
+			}
+			dec, err := Unvis(enc, flag)
+			if err != nil {
+				t.Errorf("unexpected error doing unvis(%q, %b): %s", enc, flag, err)
+				continue
+			}
+			if dec != test {
+				t.Errorf("roundtrip failed: unvis(vis(%q, %b) = %q, %b) = %q", test, flag, enc, flag, dec)
+			}
+		}
+	}
+}
+
+func TestByteStrings(t *testing.T) {
+	// It's important to make sure that we don't mess around with the layout of
+	// bytes when doing a round-trip. Otherwise we risk outputting visually
+	// identical but bit-stream non-identical strings (causing much confusion
+	// when trying to access such files).
+
+	for _, test := range [][]byte{
+		[]byte("This is a man in business suit levitating: \U0001f574"),
+		{0x7f, 0x17, 0x01, 0x33},
+		// TODO: Test arbitrary byte streams like the one below. Currently this
+		//       fails because Vis() is messing around with it (converting it
+		//       to a rune and spacing it out).
+		//{'\xef', '\xae', 'h', '\077', 'k'},
+	} {
+		testString := string(test)
+		enc, err := Vis(testString, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing vis(%q): %s", test, err)
+			continue
+		}
+		dec, err := Unvis(enc, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %s", enc, err)
+			continue
+		}
+		decBytes := []byte(dec)
+
+		if dec != testString {
+			t.Errorf("roundtrip failed [string comparison]: unvis(vis(%q) = %q) = %q", test, enc, dec)
+		}
+		if !bytes.Equal(decBytes, test) {
+			t.Errorf("roundtrip failed [byte comparison]: unvis(vis(%q) = %q) = %q", test, enc, dec)
+		}
+	}
+
+}

pkg/govis/unvis.go

@@ -0,0 +1,294 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+import (
+	"fmt"
+	"strconv"
+	"unicode"
+)
+
+// unvisParser stores the current state of the token parser.
+type unvisParser struct {
+	tokens []rune
+	idx    int
+	flag   VisFlag
+}
+
+// Next moves the index to the next character.
+func (p *unvisParser) Next() {
+	p.idx++
+}
+
+// Peek gets the current token.
+func (p *unvisParser) Peek() (rune, error) {
+	if p.idx >= len(p.tokens) {
+		return unicode.ReplacementChar, fmt.Errorf("tried to read past end of token list")
+	}
+	return p.tokens[p.idx], nil
+}
+
+// End returns whether all of the tokens have been consumed.
+func (p *unvisParser) End() bool {
+	return p.idx >= len(p.tokens)
+}
+
+func newParser(input string, flag VisFlag) *unvisParser {
+	return &unvisParser{
+		tokens: []rune(input),
+		idx:    0,
+		flag:   flag,
+	}
+}
+
+// While a recursive descent parser is overkill for parsing simple escape
+// codes, this is IMO much easier to read than the ugly 80s coroutine code used
+// by the original unvis(3) parser. Here's the EBNF for an unvis sequence:
+//
+// <input>           ::= (<rune>)*
+// <rune>            ::= ("\" <escape-sequence>) | ("%" <escape-hex>) | <plain-rune>
+// <plain-rune>      ::= any rune
+// <escape-sequence> ::= ("x" <escape-hex>) | ("M" <escape-meta>) | ("^" <escape-ctrl) | <escape-cstyle> | <escape-octal>
+// <escape-meta>     ::= ("-" <escape-meta1>) | ("^" <escape-ctrl>)
+// <escape-meta1>    ::= any rune
+// <escape-ctrl>     ::= "?" | any rune
+// <escape-cstyle>   ::= "\" | "n" | "r" | "b" | "a" | "v" | "t" | "f"
+// <escape-hex>      ::= [0-9a-f] [0-9a-f]
+// <escape-octal>    ::= [0-7] ([0-7] ([0-7])?)?
+
+func unvisPlainRune(p *unvisParser) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("plain rune: %c", ch)
+	}
+	p.Next()
+
+	// XXX: Maybe we should not be converting to runes and then back to strings
+	//      here. Are we sure that the byte-for-byte representation is the
+	//      same? If the bytes change, then using these strings for paths will
+	//      break...
+
+	str := string(ch)
+	return []byte(str), nil
+}
+
+func unvisEscapeCStyle(p *unvisParser) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("escape hex: %s", err)
+	}
+
+	output := ""
+	switch ch {
+	case 'n':
+		output = "\n"
+	case 'r':
+		output = "\r"
+	case 'b':
+		output = "\b"
+	case 'a':
+		output = "\x07"
+	case 'v':
+		output = "\v"
+	case 't':
+		output = "\t"
+	case 'f':
+		output = "\f"
+	case 's':
+		output = " "
+	case 'E':
+		output = "\x1b"
+	case '\n':
+		// Hidden newline.
+	case '$':
+		// Hidden marker.
+	default:
+		// XXX: We should probably allow falling through and return "\" here...
+		return nil, fmt.Errorf("escape cstyle: unknown escape character: %q", ch)
+	}
+
+	p.Next()
+	return []byte(output), nil
+}
+
+func unvisEscapeDigits(p *unvisParser, base int, force bool) ([]byte, error) {
+	var code int
+
+	for i := int(0xFF); i > 0; i /= base {
+		ch, err := p.Peek()
+		if err != nil {
+			if !force && i != 0xFF {
+				break
+			}
+			return nil, fmt.Errorf("escape base %d: %s", base, err)
+		}
+
+		digit, err := strconv.ParseInt(string(ch), base, 8)
+		if err != nil {
+			if !force && i != 0xFF {
+				break
+			}
+			return nil, fmt.Errorf("escape base %d: could not parse digit: %s", base, err)
+		}
+
+		code = (code * base) + int(digit)
+		p.Next()
+	}
+
+	if code > unicode.MaxLatin1 {
+		return nil, fmt.Errorf("escape base %d: code %q outside latin-1 encoding", base, code)
+	}
+
+	char := byte(code & 0xFF)
+	return []byte{char}, nil
+}
+
+func unvisEscapeCtrl(p *unvisParser, mask byte) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("escape ctrl: %s", err)
+	}
+	if ch > unicode.MaxLatin1 {
+		return nil, fmt.Errorf("escape ctrl: code %q outside latin-1 encoding", ch)
+	}
+
+	char := byte(ch) & 0x1f
+	if ch == '?' {
+		char = 0x7f
+	}
+
+	p.Next()
+	return []byte{mask | char}, nil
+}
+
+func unvisEscapeMeta(p *unvisParser) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("escape meta: %s", err)
+	}
+
+	mask := byte(0x80)
+
+	switch ch {
+	case '^':
+		// The same as "\^..." except we apply a mask.
+		p.Next()
+		return unvisEscapeCtrl(p, mask)
+
+	case '-':
+		p.Next()
+
+		ch, err := p.Peek()
+		if err != nil {
+			return nil, fmt.Errorf("escape meta1: %s", err)
+		}
+		if ch > unicode.MaxLatin1 {
+			return nil, fmt.Errorf("escape meta1: code %q outside latin-1 encoding", ch)
+		}
+
+		// Add mask to character.
+		p.Next()
+		return []byte{mask | byte(ch)}, nil
+	}
+
+	return nil, fmt.Errorf("escape meta: unknown escape char: %s", err)
+}
+
+func unvisEscapeSequence(p *unvisParser) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("escape sequence: %s", err)
+	}
+
+	switch ch {
+	case '\\':
+		p.Next()
+		return []byte("\\"), nil
+
+	case '0', '1', '2', '3', '4', '5', '6', '7':
+		return unvisEscapeDigits(p, 8, false)
+
+	case 'x':
+		p.Next()
+		return unvisEscapeDigits(p, 16, true)
+
+	case '^':
+		p.Next()
+		return unvisEscapeCtrl(p, 0x00)
+
+	case 'M':
+		p.Next()
+		return unvisEscapeMeta(p)
+
+	default:
+		return unvisEscapeCStyle(p)
+	}
+}
+
+func unvisRune(p *unvisParser) ([]byte, error) {
+	ch, err := p.Peek()
+	if err != nil {
+		return nil, fmt.Errorf("rune: %s", err)
+	}
+
+	switch ch {
+	case '\\':
+		p.Next()
+		return unvisEscapeSequence(p)
+
+	case '%':
+		// % HEX HEX only applies to HTTPStyle encodings.
+		if p.flag&VisHTTPStyle == VisHTTPStyle {
+			p.Next()
+			return unvisEscapeDigits(p, 16, true)
+		}
+		fallthrough
+
+	default:
+		return unvisPlainRune(p)
+	}
+}
+
+func unvis(p *unvisParser) (string, error) {
+	var output []byte
+	for !p.End() {
+		ch, err := unvisRune(p)
+		if err != nil {
+			return "", fmt.Errorf("input: %s", err)
+		}
+		output = append(output, ch...)
+	}
+	return string(output), nil
+}
+
+// Unvis takes a string formatted with the given Vis flags (though only the
+// VisHTTPStyle flag is checked) and output the un-encoded version of the
+// encoded string. An error is returned if any escape sequences in the input
+// string were invalid.
+func Unvis(input string, flag VisFlag) (string, error) {
+	// TODO: Check all of the VisFlag bits.
+	p := newParser(input, flag)
+	output, err := unvis(p)
+	if err != nil {
+		return "", fmt.Errorf("unvis: %s", err)
+	}
+	if !p.End() {
+		return "", fmt.Errorf("unvis: trailing characters at end of input")
+	}
+	return output, nil
+}

pkg/govis/unvis_test.go

@@ -0,0 +1,166 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+import (
+	"testing"
+)
+
+func TestUnvisError(t *testing.T) {
+	for _, test := range []string{
+		// Octal escape codes allow you to specify invalid byte values.
+		"\\777",
+		"\\420\\322\\455",
+		"\\652\\233",
+	} {
+		got, err := Unvis(test, DefaultVisFlags)
+		if err == nil {
+			t.Errorf("expected unvis(%q) to give an error, got %q", test, got)
+		}
+	}
+}
+
+func TestUnvisCStyleEscape(t *testing.T) {
+	for _, test := range []struct {
+		input    string
+		expected string
+	}{
+		{"", ""},
+		{"\\n\\v\\t\\s", "\n\v\t "},
+		{"\\\\n\\tt", "\\n\tt"},
+		{"\\b", "\b"},
+		{"\\r\\b\\n", "\r\b\n"},
+		{"\\a\\a\\b", "\x07\x07\b"},
+		{"\\f\\s\\E", "\f \x1b"},
+		// Hidden markers. They actually aren't generated by vis(3) but for
+		// some reason, they're supported...
+		{"test\\\ning", "testing"},
+		{"test\\$\\$ing", "testing"},
+	} {
+		got, err := Unvis(test.input, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
+			continue
+		}
+		if got != test.expected {
+			t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
+		}
+	}
+}
+
+func TestUnvisMetaEscape(t *testing.T) {
+	for _, test := range []struct {
+		input    string
+		expected string
+	}{
+		{"", ""},
+		{"\\M^ ?\\^ ", "\x80?\x00"},
+		{"\\M- ?\\^?", "\xa0?\x7f"},
+		{"\\M-x butterfly\\M^?", "\xf8 butterfly\xff"},
+		{"\\M^X steady-hand \\^& needle", "\x98 steady-hand \x06 needle"},
+		// TODO: Add some more of these tests, but I need to have some
+		//       secondary source to verify these outputs properly.
+	} {
+		got, err := Unvis(test.input, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
+			continue
+		}
+		if got != test.expected {
+			t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
+		}
+	}
+}
+
+func TestUnvisOctalEscape(t *testing.T) {
+	for _, test := range []struct {
+		input    string
+		expected string
+	}{
+		{"", ""},
+		{"\\1", "\001"},
+		{"\\01\\02\\3", "\001\002\003"},
+		{"\\001\\023\\32", "\001\023\032"},
+		{"this is a test\\0k1\\133", "this is a test\000k1\133"},
+		{"\\170YET\\01another test\\1\\\\82", "\170YET\001another test\001\\82"},
+		{"\\177MORE tests\\09a", "\177MORE tests\x009a"},
+		{"\\\\710more\\1215testing", "\\710more\1215testing"},
+		// Make sure that decoding unicode works properly, when it's been encoded as single bytes.
+		{"\\360\\237\\225\\264", "\U0001f574"},
+		{"T\\303\\234B\\304\\260TAK_UEKAE_K\\303\\266k_Sertifika_Hizmet_Sa\\304\\237lay\\304\\261c\\304\\261s\\304\\261_-_S\\303\\274r\\303\\274m_3.pem", "TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem"},
+		// Some invalid characters...
+		{"\\377\\2\\225\\264", "\xff\x02\x95\xb4"},
+	} {
+		got, err := Unvis(test.input, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
+			continue
+		}
+		if got != test.expected {
+			t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
+		}
+	}
+}
+
+func TestUnvisHexEscape(t *testing.T) {
+	for _, test := range []struct {
+		input    string
+		expected string
+	}{
+		{"", ""},
+		{"\\x01", "\x01"},
+		{"\\x01\\x02\\x7a", "\x01\x02\x7a"},
+		{"this is a test\\x13\\x52\\x6f", "this is a test\x13\x52\x6f"},
+		{"\\x170YET\\x01a\\x22nother test\\x11", "\x170YET\x01a\x22nother test\x11"},
+		{"\\\\x007more\\\\x215testing", "\\x007more\\x215testing"},
+		// Make sure that decoding unicode works properly, when it's been encoded as single bytes.
+		{"\\xf0\\x9f\\x95\\xb4", "\U0001f574"},
+		{"T\\xc3\\x9cB\\xc4\\xb0TAK_UEKAE_K\\xc3\\xb6k_Sertifika_Hizmet_Sa\\xc4\\x9flay\\xc4\\xb1c\\xc4\\xb1s\\xc4\\xb1_-_S\\xc3\\xbcr\\xc3\\xbcm_3.pem", "TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem"},
+		// Some invalid characters...
+		{"\\xff\\x02\\x95\\xb4", "\xff\x02\x95\xb4"},
+	} {
+		got, err := Unvis(test.input, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
+			continue
+		}
+		if got != test.expected {
+			t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
+		}
+	}
+}
+
+func TestUnvisUnicode(t *testing.T) {
+	// Ensure that unicode strings are not messed up by Unvis.
+	for _, test := range []string{
+		"",
+		"this.is.a.normal_string",
+		"AC_Raíz_Certicámara_S.A..pem",
+		"NetLock_Arany_=Class_Gold=_Főtanúsítvány.pem",
+		"TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem",
+	} {
+		got, err := Unvis(test, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error doing unvis(%q): %s", test, err)
+			continue
+		}
+		if got != test {
+			t.Errorf("expected %q to be unchanged, got %q", test, got)
+		}
+	}
+}

pkg/govis/vis.go

@@ -0,0 +1,177 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+import (
+	"fmt"
+	"unicode"
+)
+
+func isunsafe(ch rune) bool {
+	return ch == '\b' || ch == '\007' || ch == '\r'
+}
+
+func isglob(ch rune) bool {
+	return ch == '*' || ch == '?' || ch == '[' || ch == '#'
+}
+
+// ishttp is defined by RFC 1808.
+func ishttp(ch rune) bool {
+	// RFC1808 does not really consider characters outside of ASCII, so just to
+	// be safe always treat characters outside the ASCII character set as "not
+	// HTTP".
+	if ch > unicode.MaxASCII {
+		return false
+	}
+
+	return unicode.IsDigit(ch) || unicode.IsLetter(ch) ||
+		// Safe characters.
+		ch == '$' || ch == '-' || ch == '_' || ch == '.' || ch == '+' ||
+		// Extra characters.
+		ch == '!' || ch == '*' || ch == '\'' || ch == '(' ||
+		ch == ')' || ch == ','
+}
+
+func isgraph(ch rune) bool {
+	return unicode.IsGraphic(ch) && !unicode.IsSpace(ch) && ch <= unicode.MaxASCII
+}
+
+// vis converts a single *byte* into its encoding. While Go supports the
+// concept of runes (and thus native utf-8 parsing), in order to make sure that
+// the bit-stream will be completely maintained through an Unvis(Vis(...))
+// round-trip. The downside is that Vis() will never output unicode -- but on
+// the plus side this is actually a benefit on the encoding side (it will
+// always work with the simple unvis(3) implementation). It also means that we
+// don't have to worry about different multi-byte encodings.
+func vis(b byte, flag VisFlag) (string, error) {
+	// Treat the single-byte character as a rune.
+	ch := rune(b)
+
+	// XXX: This is quite a horrible thing to support.
+	if flag&VisHTTPStyle == VisHTTPStyle {
+		if !ishttp(ch) {
+			return "%" + fmt.Sprintf("%.2X", ch), nil
+		}
+	}
+
+	// Figure out if the character doesn't need to be encoded. Effectively, we
+	// encode most "normal" (graphical) characters as themselves unless we have
+	// been specifically asked not to. Note though that we *ALWAYS* encode
+	// everything outside ASCII.
+	// TODO: Switch this to much more logical code.
+
+	if ch > unicode.MaxASCII {
+		/* ... */
+	} else if flag&VisGlob == VisGlob && isglob(ch) {
+		/* ... */
+	} else if isgraph(ch) ||
+		(flag&VisSpace != VisSpace && ch == ' ') ||
+		(flag&VisTab != VisTab && ch == '\t') ||
+		(flag&VisNewline != VisNewline && ch == '\n') ||
+		(flag&VisSafe != 0 && isunsafe(ch)) {
+
+		encoded := string(ch)
+		if ch == '\\' && flag&VisNoSlash == 0 {
+			encoded += "\\"
+		}
+		return encoded, nil
+	}
+
+	// Try to use C-style escapes first.
+	if flag&VisCStyle == VisCStyle {
+		switch ch {
+		case ' ':
+			return "\\s", nil
+		case '\n':
+			return "\\n", nil
+		case '\r':
+			return "\\r", nil
+		case '\b':
+			return "\\b", nil
+		case '\a':
+			return "\\a", nil
+		case '\v':
+			return "\\v", nil
+		case '\t':
+			return "\\t", nil
+		case '\f':
+			return "\\f", nil
+		case '\x00':
+			// Output octal just to be safe.
+			return "\\000", nil
+		}
+	}
+
+	// For graphical characters we generate octal output (and also if it's
+	// being forced by the caller's flags). Also spaces should always be
+	// encoded as octal.
+	if flag&VisOctal == VisOctal || isgraph(ch) || ch&0x7f == ' ' {
+		// Always output three-character octal just to be safe.
+		return fmt.Sprintf("\\%.3o", ch), nil
+	}
+
+	// Now we have to output meta or ctrl escapes. As far as I can tell, this
+	// is not actually defined by any standard -- so this logic is basically
+	// copied from the original vis(3) implementation. Hopefully nobody
+	// actually relies on this (octal and hex are better).
+
+	encoded := ""
+	if flag&VisNoSlash == 0 {
+		encoded += "\\"
+	}
+
+	// Meta characters have 0x80 set, but are otherwise identical to control
+	// characters.
+	if b&0x80 != 0 {
+		b &= 0x7f
+		encoded += "M"
+	}
+
+	if unicode.IsControl(rune(b)) {
+		encoded += "^"
+		if b == 0x7f {
+			encoded += "?"
+		} else {
+			encoded += fmt.Sprintf("%c", b+'@')
+		}
+	} else {
+		encoded += fmt.Sprintf("-%c", b)
+	}
+
+	return encoded, nil
+}
+
+// Vis encodes the provided string to a BSD-compatible encoding using BSD's
+// vis() flags. However, it will correctly handle multi-byte encoding (which is
+// not done properly by BSD's vis implementation).
+func Vis(src string, flag VisFlag) (string, error) {
+	if flag&visMask != flag {
+		return "", fmt.Errorf("vis: flag %q contains unknown or unsupported flags", flag)
+	}
+
+	output := ""
+	for _, ch := range []byte(src) {
+		encodedCh, err := vis(ch, flag)
+		if err != nil {
+			return "", err
+		}
+		output += encodedCh
+	}
+
+	return output, nil
+}

pkg/govis/vis_test.go

@@ -0,0 +1,127 @@
+/*
+ * govis: unicode aware vis(3) encoding implementation
+ * Copyright (C) 2017 SUSE LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package govis
+
+import (
+	"testing"
+)
+
+func TestVisUnchanged(t *testing.T) {
+	for _, test := range []struct {
+		input string
+		flag  VisFlag
+	}{
+		{"", DefaultVisFlags},
+		{"helloworld", DefaultVisFlags},
+		{"THIS_IS_A_TEST1234", DefaultVisFlags},
+		{"SomeEncodingsAreCool", DefaultVisFlags},
+		{"spaces are totally safe", DefaultVisFlags &^ VisSpace},
+		{"tabs\tare\talso\tsafe!!", DefaultVisFlags &^ VisTab},
+		{"just\a\atrustme\r\b\b!!", DefaultVisFlags | VisSafe},
+	} {
+		enc, err := Vis(test.input, test.flag)
+		if err != nil {
+			t.Errorf("unexpected error with %q: %s", test, err)
+		}
+		if enc != test.input {
+			t.Errorf("expected encoding of %q (flag=%q) to be unchanged, got %q", test.input, test.flag, enc)
+		}
+	}
+}
+
+func TestVisFlags(t *testing.T) {
+	for _, test := range []struct {
+		input  string
+		output string
+		flag   VisFlag
+	}{
+		// Default
+		{"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem", "AC_Ra\\M-C\\M--z_Certic\\M-C\\M-!mara_S.A..pem", 0},
+		{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`, 0},
+		{"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", "@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", 0},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, 0},
+		{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly jnKX\M-R\M^IBe=`, 0},
+		// VisOctal
+		{"", "", VisOctal},
+		{"\022", "\\022", VisOctal},
+		{"\n \t", "\\012\\040\t", VisNewline | VisSpace | VisOctal},
+		{"\x12\f\a\n\v\b  \U00012312", "\\022\\014\\007\n\\013\\010  \\360\\222\\214\\222", VisOctal},
+		{"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem", "AC_Ra\\303\\255z_Certic\\303\\241mara_S.A..pem", VisOctal},
+		{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\303\223\302\212nqgh5/t\303\245<86>\302\262kzla\\e^lv\303\237\302\223nv\303\237\302\256a|3}\303\230\302\210\303\226\302\204`, VisOctal},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\303\206\303\2062\302\256\302\267m\303\233\303\203r^\302\277p\303\206u'q\303\273c2\303\260u\302\270\303\235\303\250v\303\277\302\260\303\234\303\202\303\2653\303\233-k\303\262sd4\\p\303\232\302\246\303\223\303\256a<\303\246s{\302\240p\303\260\303\277j\303\240\303\250\302\270\302\270\302\274\303\274b`, VisOctal},
+		{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\351\200\203"9v1)T798|o;fly jnKX\322\211Be=`, VisOctal},
+		// VisCStyle
+		{"\x00 \f \a \n\v\b \r \t\r", "\\000 \\f \\a \n\\v\\b \\r \t\\r", VisCStyle},
+		{"\t \n\v\b", "\\t \n\\v\\b", VisTab | VisCStyle},
+		{"\n\v\t   ", "\n\\v\t\\s\\s\\s", VisSpace | VisCStyle},
+		{"\n \n   ", "\\n \\n   ", VisNewline | VisCStyle},
+		{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`, VisCStyle},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, VisCStyle},
+		{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly\sjnKX\M-R\M^IBe=`, VisCStyle | VisSpace},
+		// VisSpace
+		{"  ", `\040\040`, VisSpace},
+		{"\t \t", "\t\\040\t", VisSpace},
+		{"\\040   plenty of characters here   ", `\\040\040\040\040plenty\040of\040characters\040here\040\040\040`, VisSpace},
+		{"Js9L\u00cd\u00b2o?4824y'$|P}FIr%mW /KL9$]~", `Js9L\M-C\M^M\M-B\M-2o?4824y'$|P}FIr%mW\040/KL9$]~`, VisWhite},
+		{"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h", `1\M-C\M^F\M-B\M-+Tcz+Vda?)k1%\\"P;` + "`po`" + `h`, VisWhite},
+		{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly\040jnKX\M-R\M^IBe=`, VisSpace},
+		// VisTab
+		{"\t  \v", "\\^I  \\^K", VisTab},
+		{"\t  \v", "\\011  \\013", VisTab | VisOctal},
+		// VisNewline
+		{"\t\n  \v\r\n", "\t\\^J  \\^K\\^M\\^J", VisNewline},
+		{"\t\n  \v\r\n", "\t\\012  \\013\\015\\012", VisNewline | VisOctal},
+		// VisSafe
+		// VisHTTPStyle
+		{"\x12\f\a\n\v\b  \U00012312", `%12%0C%07%0A%0B%08%20%20%F0%92%8C%92`, VisHTTPStyle},
+		{"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h", `1%C3%86%C2%ABTcz+Vda%3F)k1%25%5C%22P%3B%60po%60h`, VisHTTPStyle},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_%C3%86%C3%862%C2%AE%C2%B7m%C3%9B%C3%83r%5E%C2%BFp%C3%86u'q%C3%BBc2%C3%B0u%C2%B8%C3%9D%C3%A8v%C3%BF%C2%B0%C3%9C%C3%82%C3%B53%C3%9B-k%C3%B2sd4%5Cp%C3%9A%C2%A6%C3%93%C3%AEa%3C%C3%A6s%7B%C2%A0p%C3%B0%C3%BFj%C3%A0%C3%A8%C2%B8%C2%B8%C2%BC%C3%BCb`, VisHTTPStyle},
+		{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze%D4%8E%7C%CB%9El%DA%9Du-Rpct4+Z5b%3D%7B%40_%7Bb`, VisHTTPStyle},
+		// VisGlob
+		{"cat /proc/**/status | grep '[pid]' ;; # cool code here", `cat /proc/\052\052/status | grep '\133pid]' ;; \043 cool code here`, VisGlob},
+		{"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", `@\077e1xs+.R_Kjo]7s8pgRP:\052nXCE4{!c`, VisGlob},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, VisGlob},
+		{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\303\206\303\2062\302\256\302\267m\303\233\303\203r^\302\277p\303\206u'q\303\273c2\303\260u\302\270\303\235\303\250v\303\277\302\260\303\234\303\202\303\2653\303\233-k\303\262sd4\\p\303\232\302\246\303\223\303\256a<\303\246s{\302\240p\303\260\303\277j\303\240\303\250\302\270\302\270\302\274\303\274b`, VisGlob | VisOctal},
+		{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze\M-T\M^N|\M-K\M^^l\M-Z\M^]u-Rpct4+Z5b={@_{b`, VisGlob},
+		{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze\324\216|\313\236l\332\235u-Rpct4+Z5b={@_{b`, VisGlob | VisOctal},
+	} {
+		enc, err := Vis(test.input, test.flag)
+		if err != nil {
+			t.Errorf("unexpected error with %q: %s", test, err)
+		}
+		if enc != test.output {
+			t.Errorf("expected vis(%q, flag=%b) = %q, got %q", test.input, test.flag, test.output, enc)
+		}
+	}
+}
+
+func TestVisChanged(t *testing.T) {
+	for _, test := range []string{
+		"hello world",
+		"THIS\\IS_A_TEST1234",
+		"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem",
+	} {
+		enc, err := Vis(test, DefaultVisFlags)
+		if err != nil {
+			t.Errorf("unexpected error with %q: %s", test, err)
+		}
+		if enc == test {
+			t.Errorf("expected encoding of %q to be changed", test)
+		}
+	}
+}

releases.md

@@ -0,0 +1,11 @@
+# How to do releases:
+
+* Create a changeset with an update to `version.go`
+ - this commit will be tagged
+ - add another commit putting it back with '-dev' appended
+* gpg sign the commit with an incremented version, like 'vX.Y.Z'
+* Push the tag
+* Create a "release" from the tag on github
+ - include the binaries from `make build.arches`
+ - write about notable changes, and their contributors
+ - PRs merged for the release

stat_unix.go

@@ -0,0 +1,18 @@
+// +build !windows
+
+package mtree
+
+import (
+	"os"
+	"syscall"
+)
+
+func statIsUID(stat os.FileInfo, uid int) bool {
+	statT := stat.Sys().(*syscall.Stat_t)
+	return statT.Uid == uint32(uid)
+}
+
+func statIsGID(stat os.FileInfo, gid int) bool {
+	statT := stat.Sys().(*syscall.Stat_t)
+	return statT.Gid == uint32(gid)
+}

stat_windows.go

@@ -0,0 +1,12 @@
+// +build windows
+
+package mtree
+
+import "os"
+
+func statIsUID(stat os.FileInfo, uid int) bool {
+	return false
+}
+func statIsGID(stat os.FileInfo, uid int) bool {
+	return false
+}

tar.go

@@ -5,10 +5,12 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/sirupsen/logrus"
+	"github.com/vbatts/go-mtree/pkg/govis"
 )
 
 // Streamer creates a file hierarchy out of a tar stream
@@ -128,7 +130,7 @@ hdrloop:
 			return
 		}
 		// Alright, it's either file or directory
-		encodedName, err := Vis(filepath.Base(hdr.Name), DefaultVisFlags)
+		encodedName, err := govis.Vis(filepath.Base(hdr.Name), DefaultVisFlags)
 		if err != nil {
 			tmpFile.Close()
 			os.Remove(tmpFile.Name())
@@ -142,16 +144,16 @@ hdrloop:
 
 		// Keep track of which files are hardlinks so we can resolve them later
 		if hdr.Typeflag == tar.TypeLink {
-			linkFunc := KeywordFuncs["link"]
-			kv, err := linkFunc(hdr.Name, hdr.FileInfo(), nil)
+			keyFunc := KeywordFuncs["link"]
+			kvs, err := keyFunc(hdr.Name, hdr.FileInfo(), nil)
 			if err != nil {
-				log.Println(err)
-				break
+				logrus.Warn(err)
+				break // XXX is breaking an okay thing to do here?
 			}
-			linkname, err := Unvis(KeyVal(kv).Value())
+			linkname, err := govis.Unvis(KeyVal(kvs[0]).Value(), DefaultVisFlags)
 			if err != nil {
-				log.Println(err)
-				break
+				logrus.Warn(err)
+				break // XXX is breaking an okay thing to do here?
 			}
 			if _, ok := ts.hardlinks[linkname]; !ok {
 				ts.hardlinks[linkname] = []string{hdr.Name}
@@ -162,19 +164,19 @@ hdrloop:
 
 		// now collect keywords on the file
 		for _, keyword := range ts.keywords {
-			if keyFunc, ok := KeywordFuncs[keyword]; ok {
+			if keyFunc, ok := KeywordFuncs[keyword.Prefix()]; ok {
 				// We can't extract directories on to disk, so "size" keyword
 				// is irrelevant for now
 				if hdr.FileInfo().IsDir() && keyword == "size" {
 					continue
 				}
-				val, err := keyFunc(hdr.Name, hdr.FileInfo(), tmpFile)
+				kvs, err := keyFunc(hdr.Name, hdr.FileInfo(), tmpFile)
 				if err != nil {
 					ts.setErr(err)
 				}
 				// for good measure, check that we actually get a value for a keyword
-				if val != "" {
-					e.Keywords = append(e.Keywords, val)
+				if len(kvs) > 0 && kvs[0] != "" {
+					e.Keywords = append(e.Keywords, kvs[0])
 				}
 
 				// don't forget to reset the reader
@@ -194,13 +196,15 @@ hdrloop:
 				Type: SpecialType,
 			}
 			for _, setKW := range SetKeywords {
-				if keyFunc, ok := KeywordFuncs[setKW]; ok {
-					val, err := keyFunc(hdr.Name, hdr.FileInfo(), tmpFile)
+				if keyFunc, ok := KeywordFuncs[setKW.Prefix()]; ok {
+					kvs, err := keyFunc(hdr.Name, hdr.FileInfo(), tmpFile)
 					if err != nil {
 						ts.setErr(err)
 					}
-					if val != "" {
-						s.Keywords = append(s.Keywords, val)
+					for _, kv := range kvs {
+						if kv != "" {
+							s.Keywords = append(s.Keywords, kv)
+						}
 					}
 					if _, err := tmpFile.Seek(0, 0); err != nil {
 						tmpFile.Close()
@@ -248,7 +252,7 @@ func populateTree(root, e *Entry, hdr *tar.Header) error {
 	dirNames := strings.Split(wd, "/")
 	parent := root
 	for _, name := range dirNames[:] {
-		encoded, err := Vis(name, DefaultVisFlags)
+		encoded, err := govis.Vis(name, DefaultVisFlags)
 		if err != nil {
 			return err
 		}
@@ -381,7 +385,7 @@ func resolveHardlinks(root *Entry, hardlinks map[string][]string, countlinks boo
 		if seen, ok := originals[base]; !ok {
 			basefile = root.Find(base)
 			if basefile == nil {
-				log.Printf("%s does not exist in this tree\n", base)
+				logrus.Printf("%s does not exist in this tree\n", base)
 				continue
 			}
 			originals[base] = basefile
@@ -391,7 +395,7 @@ func resolveHardlinks(root *Entry, hardlinks map[string][]string, countlinks boo
 		for _, link := range links {
 			linkfile := root.Find(link)
 			if linkfile == nil {
-				log.Printf("%s does not exist in this tree\n", link)
+				logrus.Printf("%s does not exist in this tree\n", link)
 				continue
 			}
 			linkfile.Keywords = basefile.Keywords

tar_test.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"syscall"
 	"testing"
 	"time"
@@ -78,11 +79,16 @@ func TestTar(t *testing.T) {
 		t.Fatal("expected a DirectoryHierarchy struct, but got nil")
 	}
 
-	fh, err = os.Create("./testdata/test.mtree")
+	testDir, present := os.LookupEnv("MTREE_TESTDIR")
+	if present == false {
+		testDir = "."
+	}
+	testPath := filepath.Join(testDir, "test.mtree")
+	fh, err = os.Create(testPath)
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer os.Remove("./testdata/test.mtree")
+	defer os.Remove(testPath)
 
 	// put output of tar walk into test.mtree
 	_, err = tdh.WriteTo(fh)
@@ -92,7 +98,7 @@ func TestTar(t *testing.T) {
 	fh.Close()
 
 	// now simulate gomtree -T testdata/test.tar -f testdata/test.mtree
-	fh, err = os.Open("./testdata/test.mtree")
+	fh, err = os.Open(testPath)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -103,7 +109,7 @@ func TestTar(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	res, err := TarCheck(tdh, dh, append(DefaultKeywords, "sha1"))
+	res, err := Compare(tdh, dh, append(DefaultKeywords, "sha1"))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -158,7 +164,7 @@ func TestArchiveCreation(t *testing.T) {
 	}
 
 	// Test the tar manifest against itself
-	res, err = TarCheck(tdh, tdh, []Keyword{"sha1"})
+	res, err = Compare(tdh, tdh, []Keyword{"sha1"})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -174,7 +180,7 @@ func TestArchiveCreation(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	res, err = TarCheck(tdh, dh, []Keyword{"sha1"})
+	res, err = Compare(tdh, dh, []Keyword{"sha1"})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -212,7 +218,7 @@ func TestTreeTraversal(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	res, err := TarCheck(tdh, tdh, []Keyword{"sha1"})
+	res, err := Compare(tdh, tdh, []Keyword{"sha1"})
 	if err != nil {
 		t.Fatal(err)
 	}

test/cli.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package main
 
 import (
@@ -5,10 +7,14 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+
+	"github.com/fatih/color"
 )
 
 func main() {
 	flag.Parse()
+	green := color.New(color.FgGreen).SprintFunc()
+	red := color.New(color.FgRed).SprintFunc()
 
 	failed := 0
 	for _, arg := range flag.Args() {
@@ -20,11 +26,12 @@ func main() {
 		cmd.Stdout = os.Stdout
 		if err := cmd.Run(); err != nil {
 			failed++
-			fmt.Fprintf(os.Stderr, "FAILED: %s\n", arg)
+			fmt.Fprintf(os.Stderr, red("FAILED: %s\n"), arg)
 		}
 	}
 	if failed > 0 {
-		fmt.Fprintf(os.Stderr, "%d FAILED tests\n", failed)
+		fmt.Fprintf(os.Stderr, red("%d FAILED tests\n"), failed)
 		os.Exit(1)
 	}
+	fmt.Fprintf(os.Stdout, green("SUCCESS: no cli tests failed\n"))
 }

test/cli/0001.sh

@@ -3,8 +3,8 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${t}"
 # This test is for basic running check of manifest, and check against tar and file system
@@ -12,33 +12,33 @@ echo "[${name}] Running in ${t}"
 
 pushd ${root}
 
-git archive --format=tar HEAD^{tree} . > ${t}/${name}.tar
+git archive --format=tar -o "${t}/${name}.tar" HEAD^{tree}
 
 prev_umask=$(umask)
 umask 0 # this is so the tar command can set the mode's properly
 mkdir -p ${t}/extract
-tar -C ${t}/extract/ -xf ${t}/${name}.tar
+tar -C ${t}/extract/ -xf "${t}/${name}.tar"
 umask ${prev_umask}
 
 # create manifest from tar
-${gomtree} -K sha256digest -c -T ${t}/${name}.tar > ${t}/${name}.mtree
+${gomtree} -K sha256digest -c -T "${t}/${name}.tar" > "${t}/${name}.mtree"
 
 # check tar-manifest against the tar
-${gomtree} -f ${t}/${name}.mtree -T ${t}/${name}.tar
+${gomtree} -f ${t}/${name}.mtree -T "${t}/${name}.tar"
 
 # check tar-manifest against the filesystem
 # git archive makes the uid/gid as 0, so don't check them for this test
-${gomtree} -k size,sha256digest,mode,type -f ${t}/${name}.mtree -p ${t}/extract/
+${gomtree} -k size,sha256digest,mode,type -f "${t}/${name}.mtree" -p ${t}/extract/
 
 # create a manifest from filesystem
-${gomtree} -K sha256digest -c -p ${t}/extract/ > ${t}/${name}.mtree
+${gomtree} -K sha256digest -c -p "${t}/extract/" > "${t}/${name}.mtree"
 
 # check filesystem-manifest against the filesystem
-${gomtree} -f ${t}/${name}.mtree -p ${t}/extract/
+${gomtree} -f "${t}/${name}.mtree" -p "${t}/extract/"
 
 # check filesystem-manifest against the tar
 # git archive makes the uid/gid as 0, so don't check them for this test
-${gomtree} -k size,sha256digest,mode,type -f ${t}/${name}.mtree -T ${t}/${name}.tar
+${gomtree} -k size,sha256digest,mode,type -f "${t}/${name}.mtree" -T "${t}/${name}.tar"
 
 popd
 rm -rf ${t}

test/cli/0002.sh

@@ -3,8 +3,8 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${t}"
 # This test is for basic running check of manifest, and check against tar and file system

test/cli/0003.sh

@@ -3,10 +3,10 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
-setfattr -n user.has.xattrs -v "true" "${t}" || exit 0
+setfattr -n user.has.xattrs -v "true" "${t}"  || exit 0
 
 echo "[${name}] Running in ${t}"
 

test/cli/0004.sh

@@ -4,8 +4,8 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${t}"
 

test/cli/0005.sh

@@ -3,8 +3,8 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${t}"
 

test/cli/0006.sh

@@ -3,8 +3,8 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-t=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${t}"
 # This test is for basic running check of manifest, and check against tar and file system

test/cli/0007.sh

@@ -3,9 +3,9 @@ set -e
 
 name=$(basename $0)
 root="$(dirname $(dirname $(dirname $0)))"
-gomtree=$(readlink -f ${root}/gomtree)
-left=$(mktemp -t -d go-mtree.XXXXXX)
-right=$(mktemp -t -d go-mtree.XXXXXX)
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+left=$(mktemp -d -t go-mtree.XXXXXX)
+right=$(mktemp -d -t go-mtree.XXXXXX)
 
 echo "[${name}] Running in ${left} and ${right}"
 

test/cli/0008.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+name=$(basename $0)
+root="$(dirname $(dirname $(dirname $0)))"
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d /tmp/go-mtree.XXXXXX)
+
+echo "[${name}] Running in ${t}"
+
+pushd ${root}
+mkdir -p ${t}/extract
+git archive --format=tar HEAD^{tree} . | tar -C ${t}/extract/ -x
+
+${gomtree} -K sha256digest -c -p ${t}/extract/ > ${t}/${name}.mtree
+
+## This is a use-case for checking a directory, but by reading the manifest from stdin
+## since the `-f` flag is not provided.
+cat ${t}/${name}.mtree | ${gomtree} -p ${t}/extract/
+
+popd
+rm -rf ${t}

test/cli/0009.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+name=$(basename $0)
+root="$(dirname $(dirname $(dirname $0)))"
+gomtree=$(go run ${root}/test/realpath.go ${root}/gomtree)
+t=$(mktemp -d -t go-mtree.XXXXXX)
+
+echo "[${name}] Running in ${t}"
+
+pushd ${root}
+
+# Create some unicode files.
+mkdir ${t}/root
+echo "some data" > "${t}/root/$(printf 'this file has \u042a some unicode !!')"
+echo "more data" > "${t}/root/$(printf 'even more \x07 unicode \ua4ff characters \udead\ubeef\ucafe')"
+mkdir -p "${t}/root/$(printf '\024 <-- some more weird characters --> \u4f60\u597d\uff0c\u4e16\u754c')"
+ln -s "$(printf '62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u"q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db')" "${t}/root/$(printf 'k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb')"
+printf 'some lovely data 62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r' > "${t}/root/$(printf 'T\u00dcB\u0130TAK_UEKAE_K\u00f6k_Sertifika_Hizmet_Sa\u011flay\u0131c\u0131s\u0131_-_S\u00fcr\u00fcm_3.pem')"
+
+# Create manifest and check it against the same root.
+${gomtree} -k uid,gid,size,type,link,nlink,sha256digest -c -p ${t}/root > ${t}/root.mtree
+${gomtree} -k uid,gid,size,type,link,nlink,sha256digest -f ${t}/root.mtree -p ${t}/root
+
+# Modify it and make sure that it successfully figures out what changed.
+echo "othe data" > "${t}/root/$(printf 'this file has \u042a some unicode !!')"
+! ${gomtree} -k uid,gid,size,type,link,nlink,sha256digest -f ${t}/root.mtree -p ${t}/root
+
+echo "some data" > "${t}/root/$(printf 'this file has \u042a some unicode !!')"
+${gomtree} -k uid,gid,size,type,link,nlink,sha256digest -f ${t}/root.mtree -p ${t}/root
+
+popd
+rm -rf ${t}

test/doc.go

@@ -0,0 +1,3 @@
+package test
+
+// place holder for test helpers

test/realpath.go

@@ -0,0 +1,22 @@
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	flag.Parse()
+	for _, arg := range flag.Args() {
+		path, err := filepath.Abs(arg)
+		if err != nil {
+			fmt.Fprint(os.Stderr, err)
+			os.Exit(1)
+		}
+		fmt.Printf("%s", path)
+	}
+}

testdata/source.casync-mtree

@@ -0,0 +1,800 @@
+. type=dir mode=0775 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1513088963.690901011
+.git type=dir mode=0775 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1513089565.023874273
+.git/FETCH_HEAD type=file mode=0664 size=0 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1513089402.952611958 sha512256digest=c672b8d1ef56ed28ab87c3622c5114069bdd3ad7b8f9737498d0c01ecef0967a
+.git/HEAD type=file mode=0664 size=23 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.419901036 sha512256digest=459551401449a0555a2c1a1ef57f17eab8b70afccd1ae2fb089e1fe216d92041
+.git/branches type=dir mode=0775 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512773804.793867723
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+vendor/golang.org/x/sys/windows/types_windows.go type=file mode=0664 size=31549 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=3f82ee167ab35b67c63619c544e47a05e2d26af92761d799ad5d1d6d99e73294
+vendor/golang.org/x/sys/windows/types_windows_386.go type=file mode=0664 size=478 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=8bb43554de9c8339edfac4c58130193448c774660c9659cb1ae49c2710e6d547
+vendor/golang.org/x/sys/windows/types_windows_amd64.go type=file mode=0664 size=478 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=25469d12b697e94aa4eb902b8643f5fec03108885e1521d470623237962ec497
+vendor/golang.org/x/sys/windows/zsyscall_windows.go type=file mode=0664 size=81066 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=f6c866585ffde0cc4ebedd64b2ea42ef6af9624880c353409ada4d868b895db0
+version.go type=file mode=0664 size=624 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=8653b2bc3523c290f6bd998bb29865c0165ad4e85aaccd0816a34287dc0e04d1
+walk.go type=file mode=0664 size=10410 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=d398fe4bb1bb9af39442dd6f695fa2fc66302ebbcb5bc1adb6418b2f3d5f9ed3
+walk_test.go type=file mode=0664 size=1156 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1513088893.904788061 sha512256digest=227e25157b95da02017dab4d2dcff4199f356219cfc622228a6fe0535a41ab1c
+xattr type=dir mode=0775 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767
+xattr/xattr.go type=file mode=0664 size=984 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=a2700b603df30c3b0a91bdcf9045e64aea42f62647b0128ea154f51a0c48991e
+xattr/xattr_test.go type=file mode=0664 size=859 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=91294ea554801b75f6a9e33c268807c9620b531eb813ea24512dd4eeaf0592e4
+xattr/xattr_unsupported.go type=file mode=0664 size=509 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=81ced06a1cdf88c4936d10bbf8d46edc2d42dc26efeed3691ddbeeb469865f8a
+xattr/xattr_unsupported_test.go type=file mode=0664 size=877 uid=1000 gid=1000 uname=vbatts gname=vbatts time=1512774394.470900767 sha512256digest=46605a03a985c7a3a4ab1a488f81382db4865f77b90b6a2b32693af39a8e1fba

unvis.go

@@ -1,7 +0,0 @@
-package mtree
-
-// Unvis is a wrapper for the C implementation of unvis, which decodes a string
-// that potentially has characters that are encoded with Vis
-func Unvis(src string) (string, error) {
-	return unvis(src)
-}

unvis_c.go

@@ -1,11 +0,0 @@
-// +build cgo,cvis
-
-package mtree
-
-import (
-	"github.com/vbatts/go-mtree/cvis"
-)
-
-func unvis(src string) (string, error) {
-	return cvis.Unvis(src)
-}

unvis_go.go

@@ -1,228 +0,0 @@
-// +build !cvis
-
-package mtree
-
-import "unicode"
-
-func unvis(src string) (string, error) {
-	dst := &[]byte{}
-	var s state
-	for i, r := range src {
-	again:
-		err := unvisRune(dst, r, &s, 0)
-		switch err {
-		case unvisValid:
-			break
-		case unvisValidPush:
-			goto again
-		case unvisNone:
-			fallthrough
-		case unvisNochar:
-			break
-		default:
-			return "", err
-		}
-		if i == len(src)-1 {
-			unvisRune(dst, r, &s, unvisEnd)
-		}
-	}
-	return string(*dst), nil
-}
-
-func unvisRune(dst *[]byte, r rune, s *state, flags VisFlag) error {
-	if (flags & unvisEnd) != 0 {
-		if *s == stateOctal2 || *s == stateOctal3 {
-			*s = stateGround
-			return unvisValid
-		}
-		if *s == stateGround {
-			return unvisNochar
-		}
-		return unvisErrSynbad
-	}
-
-	switch *s & ^stateHTTP {
-	case stateGround:
-		if r == '\\' {
-			*s = stateStart
-			return unvisNone
-		}
-		if flags&VisHttpstyle != 0 && r == '%' {
-			*s = stateStart | stateHTTP
-			return unvisNone
-		}
-		*dst = append(*dst, byte(r))
-		return unvisValid
-	case stateStart:
-		if *s&stateHTTP != 0 && ishex(unicode.ToLower(r)) {
-			if unicode.IsNumber(r) {
-				*dst = append(*dst, byte(r-'0'))
-			} else {
-				*dst = append(*dst, byte(unicode.ToLower(r)-'a'))
-			}
-			*s = stateHex2
-			return unvisNone
-		}
-		switch r {
-		case '\\':
-			*s = stateGround
-			*dst = append(*dst, byte(r))
-			return unvisValid
-		case '0':
-			fallthrough
-		case '1':
-			fallthrough
-		case '2':
-			fallthrough
-		case '3':
-			fallthrough
-		case '4':
-			fallthrough
-		case '5':
-			fallthrough
-		case '6':
-			fallthrough
-		case '7':
-			*s = stateOctal2
-			*dst = append(*dst, byte(r-'0'))
-			return unvisNone
-		case 'M':
-			*s = stateMeta
-			*dst = append(*dst, 0200)
-			return unvisNone
-		case '^':
-			*s = stateCtrl
-			return unvisNone
-		case 'n':
-			*s = stateGround
-			*dst = append(*dst, '\n')
-			return unvisValid
-		case 'r':
-			*s = stateGround
-			*dst = append(*dst, '\r')
-			return unvisValid
-		case 'b':
-			*s = stateGround
-			*dst = append(*dst, '\b')
-			return unvisValid
-		case 'a':
-			*s = stateGround
-			*dst = append(*dst, '\007')
-			return unvisValid
-		case 'v':
-			*s = stateGround
-			*dst = append(*dst, '\v')
-			return unvisValid
-		case 't':
-			*s = stateGround
-			*dst = append(*dst, '\t')
-			return unvisValid
-		case 'f':
-			*s = stateGround
-			*dst = append(*dst, '\f')
-			return unvisValid
-		case 's':
-			*s = stateGround
-			*dst = append(*dst, ' ')
-			return unvisValid
-		case 'E':
-			*s = stateGround
-			*dst = append(*dst, '\033')
-			return unvisValid
-		case '\n':
-			// hidden newline
-			*s = stateGround
-			return unvisNochar
-		case '$':
-			// hidden marker
-			*s = stateGround
-			return unvisNochar
-		}
-		*s = stateGround
-		return unvisErrSynbad
-	case stateMeta:
-		if r == '-' {
-			*s = stateMeta1
-		} else if r == '^' {
-			*s = stateCtrl
-		} else {
-			*s = stateGround
-			return unvisErrSynbad
-		}
-		return unvisNone
-	case stateMeta1:
-		*s = stateGround
-		dp := *dst
-		dp[len(dp)-1] |= byte(r)
-		return unvisValid
-	case stateCtrl:
-		dp := *dst
-		if r == '?' {
-			dp[len(dp)-1] |= 0177
-		} else {
-			dp[len(dp)-1] |= byte(r & 037)
-		}
-		*s = stateGround
-		return unvisValid
-	case stateOctal2:
-		if isoctal(r) {
-			dp := *dst
-			if len(dp) > 0 {
-				last := dp[len(dp)-1]
-				dp[len(dp)-1] = (last << 3) + byte(r-'0')
-			} else {
-				dp = append(dp, byte((0<<3)+(r-'0')))
-			}
-			*s = stateOctal3
-			return unvisNone
-		}
-		*s = stateGround
-		return unvisValidPush
-	case stateOctal3:
-		*s = stateGround
-		if isoctal(r) {
-			dp := *dst
-			if len(dp) > 0 {
-				last := dp[len(dp)-1]
-				dp[len(dp)-1] = (last << 3) + byte(r-'0')
-			} else {
-				dp = append(dp, (0<<3)+byte(r-'0'))
-			}
-			return unvisValid
-		}
-		return unvisValidPush
-	case stateHex2:
-		if ishex(unicode.ToLower(r)) {
-			last := byte(0)
-			dp := *dst
-			if len(dp) > 0 {
-				last = dp[len(dp)-1]
-			}
-			if unicode.IsNumber(r) {
-				dp = append(dp, (last<<4)+byte(r-'0'))
-			} else {
-				dp = append(dp, (last<<4)+byte(unicode.ToLower(r)-'a'+10))
-			}
-		}
-		*s = stateGround
-		return unvisValid
-	}
-
-	*s = stateGround
-	return unvisErrSynbad
-}
-
-type state int
-
-const (
-	stateGround state = iota /* haven't seen escape char */
-	stateStart               /* start decoding special sequence */
-	stateMeta                /* metachar started (M) */
-	stateMeta1               /* metachar more, regular char (-) */
-	stateCtrl                /* control char started (^) */
-	stateOctal2              /* octal digit 2 */
-	stateOctal3              /* octal digit 3 */
-	stateHex2                /* hex digit 2 */
-
-	stateHTTP state = 0x080 /* %HEXHEX escape */
-)

unvis_go_test.go

@@ -1,45 +0,0 @@
-package mtree
-
-import "testing"
-
-type runeCheck func(rune) bool
-
-func TestUnvisHelpers(t *testing.T) {
-	testset := []struct {
-		R      rune
-		Check  runeCheck
-		Expect bool
-	}{
-		{'a', ishex, true},
-		{'A', ishex, true},
-		{'z', ishex, false},
-		{'Z', ishex, false},
-		{'G', ishex, false},
-		{'1', ishex, true},
-		{'0', ishex, true},
-		{'9', ishex, true},
-		{'0', isoctal, true},
-		{'3', isoctal, true},
-		{'7', isoctal, true},
-		{'9', isoctal, false},
-		{'a', isoctal, false},
-		{'z', isoctal, false},
-		{'3', isalnum, true},
-		{'a', isalnum, true},
-		{';', isalnum, false},
-		{'!', isalnum, false},
-		{' ', isalnum, false},
-		{'3', isgraph, true},
-		{'a', isgraph, true},
-		{';', isgraph, true},
-		{'!', isgraph, true},
-		{' ', isgraph, false},
-	}
-
-	for i, ts := range testset {
-		got := ts.Check(ts.R)
-		if got != ts.Expect {
-			t.Errorf("%d: %q expected: %t; got %t", i, string(ts.R), ts.Expect, got)
-		}
-	}
-}

update.go

@@ -0,0 +1,154 @@
+package mtree
+
+import (
+	"container/heap"
+	"os"
+	"sort"
+
+	"github.com/sirupsen/logrus"
+)
+
+// DefaultUpdateKeywords is the default set of keywords that can take updates to the files on disk
+var DefaultUpdateKeywords = []Keyword{
+	"uid",
+	"gid",
+	"mode",
+	"xattr",
+	"link",
+	"time",
+}
+
+// Update attempts to set the attributes of root directory path, given the values of `keywords` in dh DirectoryHierarchy.
+func Update(root string, dh *DirectoryHierarchy, keywords []Keyword, fs FsEval) ([]InodeDelta, error) {
+	creator := dhCreator{DH: dh}
+	curDir, err := os.Getwd()
+	if err == nil {
+		defer os.Chdir(curDir)
+	}
+
+	if err := os.Chdir(root); err != nil {
+		return nil, err
+	}
+	sort.Sort(byPos(creator.DH.Entries))
+
+	// This is for deferring the update of mtimes of directories, to unwind them
+	// in a most specific path first
+	h := &pathUpdateHeap{}
+	heap.Init(h)
+
+	results := []InodeDelta{}
+	for i, e := range creator.DH.Entries {
+		switch e.Type {
+		case SpecialType:
+			if e.Name == "/set" {
+				creator.curSet = &creator.DH.Entries[i]
+			} else if e.Name == "/unset" {
+				creator.curSet = nil
+			}
+			logrus.Debugf("%#v", e)
+			continue
+		case RelativeType, FullType:
+			e.Set = creator.curSet
+			pathname, err := e.Path()
+			if err != nil {
+				return nil, err
+			}
+
+			// filter the keywords to update on the file, from the keywords available for this entry:
+			var kvToUpdate []KeyVal
+			kvToUpdate = keyvalSelector(e.AllKeys(), keywords)
+			logrus.Debugf("kvToUpdate(%q): %#v", pathname, kvToUpdate)
+
+			for _, kv := range kvToUpdate {
+				if !InKeywordSlice(kv.Keyword().Prefix(), keywordPrefixes(keywords)) {
+					continue
+				}
+				logrus.Debugf("finding function for %q (%q)", kv.Keyword(), kv.Keyword().Prefix())
+				ukFunc, ok := UpdateKeywordFuncs[kv.Keyword().Prefix()]
+				if !ok {
+					logrus.Debugf("no UpdateKeywordFunc for %s; skipping", kv.Keyword())
+					continue
+				}
+
+				// TODO check for the type=dir of the entry as well
+				if kv.Keyword().Prefix() == "time" && e.IsDir() {
+					heap.Push(h, pathUpdate{
+						Path: pathname,
+						E:    e,
+						KV:   kv,
+						Func: ukFunc,
+					})
+
+					continue
+				}
+
+				if _, err := ukFunc(pathname, kv); err != nil {
+					results = append(results, InodeDelta{
+						diff: ErrorDifference,
+						path: pathname,
+						old:  e,
+						keys: []KeyDelta{
+							{
+								diff: ErrorDifference,
+								name: kv.Keyword(),
+								err:  err,
+							},
+						}})
+				}
+				// XXX really would be great to have a Check() or Compare() right here,
+				// to compare each entry as it is encountered, rather than just running
+				// Check() on this path after the whole update is finished.
+			}
+		}
+	}
+
+	for h.Len() > 0 {
+		pu := heap.Pop(h).(pathUpdate)
+		if _, err := pu.Func(pu.Path, pu.KV); err != nil {
+			results = append(results, InodeDelta{
+				diff: ErrorDifference,
+				path: pu.Path,
+				old:  pu.E,
+				keys: []KeyDelta{
+					{
+						diff: ErrorDifference,
+						name: pu.KV.Keyword(),
+						err:  err,
+					},
+				}})
+		}
+	}
+	return results, nil
+}
+
+type pathUpdateHeap []pathUpdate
+
+func (h pathUpdateHeap) Len() int      { return len(h) }
+func (h pathUpdateHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
+
+// This may end up looking backwards, but for container/heap, Less evaluates
+// the negative priority. So when popping members of the array, it will be
+// sorted by least. For this use-case, we want the most-qualified-name popped
+// first (the longest path name), such that "." is the last entry popped.
+func (h pathUpdateHeap) Less(i, j int) bool {
+	return len(h[i].Path) > len(h[j].Path)
+}
+
+func (h *pathUpdateHeap) Push(x interface{}) {
+	*h = append(*h, x.(pathUpdate))
+}
+
+func (h *pathUpdateHeap) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}
+
+type pathUpdate struct {
+	Path string
+	E    Entry
+	KV   KeyVal
+	Func UpdateKeywordFunc
+}

update_linux_test.go

@@ -0,0 +1,94 @@
+package mtree
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/vbatts/go-mtree/xattr"
+)
+
+func init() {
+	//logrus.SetLevel(logrus.DebugLevel)
+}
+
+func TestXattrUpdate(t *testing.T) {
+	content := []byte("I know half of you half as well as I ought to")
+	// a bit dirty to create/destory a directory in cwd, but often /tmp is
+	// mounted tmpfs and doesn't support xattrs
+	dir, err := ioutil.TempDir(".", "test.xattr.restore.")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir) // clean up
+
+	tmpfn := filepath.Join(dir, "tmpfile")
+	if err := ioutil.WriteFile(tmpfn, content, 0666); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := xattr.Set(dir, "user.test", []byte("directory")); err != nil {
+		t.Skip(fmt.Sprintf("skipping: %q does not support xattrs", dir))
+	}
+	if err := xattr.Set(tmpfn, "user.test", []byte("regular file")); err != nil {
+		t.Fatal(err)
+	}
+
+	// Walk this tempdir
+	dh, err := Walk(dir, nil, append(DefaultKeywords, []Keyword{"xattr", "sha1"}...), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Now check that we're sane
+	res, err := Check(dir, dh, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) != 0 {
+		t.Errorf("expecting no failures, but got %q", res)
+	}
+
+	if err := xattr.Set(tmpfn, "user.test", []byte("let it fly")); err != nil {
+		t.Fatal(err)
+	}
+
+	// Now check that we fail the check
+	res, err = Check(dir, dh, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) == 0 {
+		t.Error("expected failures (like xattrs), but got none")
+	}
+
+	// restore the xattrs to original
+	res, err = Update(dir, dh, append(DefaultUpdateKeywords, "xattr"), nil)
+	if err != nil {
+		t.Error(err)
+	}
+	if len(res) != 0 {
+		t.Errorf("expecting no failures, but got %q", res)
+	}
+
+	// Now check that we're sane again
+	res, err = Check(dir, dh, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) != 0 {
+		// pretty this shit up
+		buf, err := json.MarshalIndent(res, "", "  ")
+		if err != nil {
+			t.Errorf("expecting no failures, but got %q", res)
+		} else {
+			t.Errorf("expecting no failures, but got %s", string(buf))
+		}
+	}
+
+	// TODO make a test for xattr here. Likely in the user space for privileges. Even still this may be prone to error for some tmpfs don't act right with xattrs. :-\
+	// I'd hate to have to t.Skip() a test rather than fail alltogether.
+}

update_test.go

@@ -0,0 +1,136 @@
+// +build go1.7
+
+package mtree
+
+import (
+	"container/heap"
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+func init() {
+	logrus.SetLevel(logrus.DebugLevel)
+}
+
+func TestUpdate(t *testing.T) {
+	content := []byte("I know half of you half as well as I ought to")
+	dir, err := ioutil.TempDir("", "test-check-keywords")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir) // clean up
+
+	tmpfn := filepath.Join(dir, "tmpfile")
+	if err := ioutil.WriteFile(tmpfn, content, 0666); err != nil {
+		t.Fatal(err)
+	}
+
+	// Walk this tempdir
+	dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Touch a file, so the mtime changes.
+	now := time.Now()
+	if err := os.Chtimes(tmpfn, now, now); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Chmod(tmpfn, os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+
+	// Changing user is a little tough, but the group can be changed by a limited user to any group that the user is a member of. So just choose one that is not the current main group.
+	u, err := user.Current()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ugroups, err := u.GroupIds()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, ugroup := range ugroups {
+		if ugroup == u.Gid {
+			continue
+		}
+		gid, err := strconv.Atoi(ugroup)
+		if err != nil {
+			t.Fatal(ugroup)
+		}
+		if err := os.Lchown(tmpfn, -1, gid); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	// Check for sanity. This ought to have failures
+	res, err := Check(dir, dh, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) == 0 {
+		t.Error("expected failures (like mtimes), but got none")
+	}
+	//dh.WriteTo(os.Stdout)
+
+	res, err = Update(dir, dh, DefaultUpdateKeywords, nil)
+	if err != nil {
+		t.Error(err)
+	}
+	if len(res) > 0 {
+		// pretty this shit up
+		buf, err := json.MarshalIndent(res, "", "  ")
+		if err != nil {
+			t.Errorf("%#v", res)
+		}
+		t.Error(string(buf))
+	}
+
+	// Now check that we're sane again
+	res, err = Check(dir, dh, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// should have no failures now
+	if len(res) > 0 {
+		// pretty this shit up
+		buf, err := json.MarshalIndent(res, "", "  ")
+		if err != nil {
+			t.Errorf("%#v", res)
+		} else {
+			t.Error(string(buf))
+		}
+	}
+
+}
+
+func TestPathUpdateHeap(t *testing.T) {
+	h := &pathUpdateHeap{
+		pathUpdate{Path: "not/the/longest"},
+		pathUpdate{Path: "almost/the/longest"},
+		pathUpdate{Path: "."},
+		pathUpdate{Path: "short"},
+	}
+	heap.Init(h)
+	v := "this/is/one/is/def/the/longest"
+	heap.Push(h, pathUpdate{Path: v})
+
+	longest := len(v)
+	var p string
+	for h.Len() > 0 {
+		p = heap.Pop(h).(pathUpdate).Path
+		if len(p) > longest {
+			t.Errorf("expected next path to be shorter, but it was not %q is longer than %d", p, longest)
+		}
+	}
+	if p != "." {
+		t.Errorf("expected \".\" to be the last, but got %q", p)
+	}
+}

updatefuncs.go

@@ -0,0 +1,201 @@
+package mtree
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/vbatts/go-mtree/pkg/govis"
+)
+
+// UpdateKeywordFunc is the signature for a function that will restore a file's
+// attributes. Where path is relative path to the file, and value to be
+// restored to.
+type UpdateKeywordFunc func(path string, kv KeyVal) (os.FileInfo, error)
+
+// UpdateKeywordFuncs is the registered list of functions to update file attributes.
+// Keyed by the keyword as it would show up in the manifest
+var UpdateKeywordFuncs = map[Keyword]UpdateKeywordFunc{
+	"mode":     modeUpdateKeywordFunc,
+	"time":     timeUpdateKeywordFunc,
+	"tar_time": tartimeUpdateKeywordFunc,
+	"uid":      uidUpdateKeywordFunc,
+	"gid":      gidUpdateKeywordFunc,
+	"xattr":    xattrUpdateKeywordFunc,
+	"link":     linkUpdateKeywordFunc,
+}
+
+func uidUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	uid, err := strconv.Atoi(kv.Value())
+	if err != nil {
+		return nil, err
+	}
+
+	stat, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+	if statIsUID(stat, uid) {
+		return stat, nil
+	}
+
+	if err := os.Lchown(path, uid, -1); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}
+
+func gidUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	gid, err := strconv.Atoi(kv.Value())
+	if err != nil {
+		return nil, err
+	}
+
+	stat, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+	if statIsGID(stat, gid) {
+		return stat, nil
+	}
+
+	if err := os.Lchown(path, -1, gid); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}
+
+func modeUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	info, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	// don't set mode on symlinks, as it passes through to the backing file
+	if info.Mode()&os.ModeSymlink != 0 {
+		return info, nil
+	}
+	vmode, err := strconv.ParseInt(kv.Value(), 8, 32)
+	if err != nil {
+		return nil, err
+	}
+
+	stat, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+	if stat.Mode() == os.FileMode(vmode) {
+		return stat, nil
+	}
+
+	logrus.Debugf("path: %q, kv.Value(): %q, vmode: %o", path, kv.Value(), vmode)
+	if err := os.Chmod(path, os.FileMode(vmode)); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}
+
+// since tar_time will only be second level precision, then when restoring the
+// filepath from a tar_time, then compare the seconds first and only Chtimes if
+// the seconds value is different.
+func tartimeUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	info, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	v := strings.SplitN(kv.Value(), ".", 2)
+	if len(v) != 2 {
+		return nil, fmt.Errorf("expected a number like 1469104727.000000000")
+	}
+	sec, err := strconv.ParseInt(v[0], 10, 64)
+	if err != nil {
+		return nil, fmt.Errorf("expected seconds, but got %q", v[0])
+	}
+
+	// if the seconds are the same, don't do anything, because the file might
+	// have nanosecond value, and if using tar_time it would zero it out.
+	if info.ModTime().Unix() == sec {
+		return info, nil
+	}
+
+	vtime := time.Unix(sec, 0)
+
+	// if times are same then don't modify anything
+	// comparing Unix, since it does not include Nano seconds
+	if info.ModTime().Unix() == vtime.Unix() {
+		return info, nil
+	}
+
+	// symlinks are strange and most of the time passes through to the backing file
+	if info.Mode()&os.ModeSymlink != 0 {
+		if err := lchtimes(path, vtime, vtime); err != nil {
+			return nil, err
+		}
+	} else if err := os.Chtimes(path, vtime, vtime); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}
+
+// this is nano second precision
+func timeUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	info, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	v := strings.SplitN(kv.Value(), ".", 2)
+	if len(v) != 2 {
+		return nil, fmt.Errorf("expected a number like 1469104727.871937272")
+	}
+	nsec, err := strconv.ParseInt(v[0]+v[1], 10, 64)
+	if err != nil {
+		return nil, fmt.Errorf("expected nano seconds, but got %q", v[0]+v[1])
+	}
+	logrus.Debugf("arg: %q; nsec: %d", v[0]+v[1], nsec)
+
+	vtime := time.Unix(0, nsec)
+
+	// if times are same then don't modify anything
+	if info.ModTime().Equal(vtime) {
+		return info, nil
+	}
+
+	// symlinks are strange and most of the time passes through to the backing file
+	if info.Mode()&os.ModeSymlink != 0 {
+		if err := lchtimes(path, vtime, vtime); err != nil {
+			return nil, err
+		}
+	} else if err := os.Chtimes(path, vtime, vtime); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}
+
+func linkUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	linkname, err := govis.Unvis(kv.Value(), DefaultVisFlags)
+	if err != nil {
+		return nil, err
+	}
+	got, err := os.Readlink(path)
+	if err != nil {
+		return nil, err
+	}
+	if got == linkname {
+		return os.Lstat(path)
+	}
+
+	logrus.Debugf("linkUpdateKeywordFunc: removing %q to link to %q", path, linkname)
+	if err := os.Remove(path); err != nil {
+		return nil, err
+	}
+	if err := os.Symlink(linkname, path); err != nil {
+		return nil, err
+	}
+
+	return os.Lstat(path)
+}

updatefuncs_linux.go

@@ -0,0 +1,21 @@
+// +build linux
+
+package mtree
+
+import (
+	"encoding/base64"
+	"os"
+
+	"github.com/vbatts/go-mtree/xattr"
+)
+
+func xattrUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	buf, err := base64.StdEncoding.DecodeString(kv.Value())
+	if err != nil {
+		return nil, err
+	}
+	if err := xattr.Set(path, kv.Keyword().Suffix(), buf); err != nil {
+		return nil, err
+	}
+	return os.Lstat(path)
+}

updatefuncs_unsupported.go

@@ -0,0 +1,11 @@
+// +build !linux
+
+package mtree
+
+import (
+	"os"
+)
+
+func xattrUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
+	return os.Lstat(path)
+}

vendor/github.com/davecgh/go-spew/LICENSE

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2012-2016 Dave Collins <dave@davec.name>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

vendor/github.com/davecgh/go-spew/spew/bypass.go

@@ -0,0 +1,145 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is not running on Google App Engine, compiled by GopherJS, and
+// "-tags safe" is not added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// Go versions prior to 1.4 are disabled because they use a different layout
+// for interfaces which make the implementation of unsafeReflectValue more complex.
+// +build !js,!appengine,!safe,!disableunsafe,go1.4
+
+package spew
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = false
+
+	// ptrSize is the size of a pointer on the current arch.
+	ptrSize = unsafe.Sizeof((*byte)(nil))
+)
+
+type flag uintptr
+
+var (
+	// flagRO indicates whether the value field of a reflect.Value
+	// is read-only.
+	flagRO flag
+
+	// flagAddr indicates whether the address of the reflect.Value's
+	// value may be taken.
+	flagAddr flag
+)
+
+// flagKindMask holds the bits that make up the kind
+// part of the flags field. In all the supported versions,
+// it is in the lower 5 bits.
+const flagKindMask = flag(0x1f)
+
+// Different versions of Go have used different
+// bit layouts for the flags type. This table
+// records the known combinations.
+var okFlags = []struct {
+	ro, addr flag
+}{{
+	// From Go 1.4 to 1.5
+	ro:   1 << 5,
+	addr: 1 << 7,
+}, {
+	// Up to Go tip.
+	ro:   1<<5 | 1<<6,
+	addr: 1 << 8,
+}}
+
+var flagValOffset = func() uintptr {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	return field.Offset
+}()
+
+// flagField returns a pointer to the flag field of a reflect.Value.
+func flagField(v *reflect.Value) *flag {
+	return (*flag)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + flagValOffset))
+}
+
+// unsafeReflectValue converts the passed reflect.Value into a one that bypasses
+// the typical safety restrictions preventing access to unaddressable and
+// unexported data.  It works by digging the raw pointer to the underlying
+// value out of the protected value and generating a new unprotected (unsafe)
+// reflect.Value to it.
+//
+// This allows us to check for implementations of the Stringer and error
+// interfaces to be used for pretty printing ordinarily unaddressable and
+// inaccessible values such as unexported struct fields.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	if !v.IsValid() || (v.CanInterface() && v.CanAddr()) {
+		return v
+	}
+	flagFieldPtr := flagField(&v)
+	*flagFieldPtr &^= flagRO
+	*flagFieldPtr |= flagAddr
+	return v
+}
+
+// Sanity checks against future reflect package changes
+// to the type or semantics of the Value.flag field.
+func init() {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	if field.Type.Kind() != reflect.TypeOf(flag(0)).Kind() {
+		panic("reflect.Value flag field has changed kind")
+	}
+	type t0 int
+	var t struct {
+		A t0
+		// t0 will have flagEmbedRO set.
+		t0
+		// a will have flagStickyRO set
+		a t0
+	}
+	vA := reflect.ValueOf(t).FieldByName("A")
+	va := reflect.ValueOf(t).FieldByName("a")
+	vt0 := reflect.ValueOf(t).FieldByName("t0")
+
+	// Infer flagRO from the difference between the flags
+	// for the (otherwise identical) fields in t.
+	flagPublic := *flagField(&vA)
+	flagWithRO := *flagField(&va) | *flagField(&vt0)
+	flagRO = flagPublic ^ flagWithRO
+
+	// Infer flagAddr from the difference between a value
+	// taken from a pointer and not.
+	vPtrA := reflect.ValueOf(&t).Elem().FieldByName("A")
+	flagNoPtr := *flagField(&vA)
+	flagPtr := *flagField(&vPtrA)
+	flagAddr = flagNoPtr ^ flagPtr
+
+	// Check that the inferred flags tally with one of the known versions.
+	for _, f := range okFlags {
+		if flagRO == f.ro && flagAddr == f.addr {
+			return
+		}
+	}
+	panic("reflect.Value read-only flag has changed semantics")
+}

vendor/github.com/davecgh/go-spew/spew/bypasssafe.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is running on Google App Engine, compiled by GopherJS, or
+// "-tags safe" is added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// +build js appengine safe disableunsafe !go1.4
+
+package spew
+
+import "reflect"
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = true
+)
+
+// unsafeReflectValue typically converts the passed reflect.Value into a one
+// that bypasses the typical safety restrictions preventing access to
+// unaddressable and unexported data.  However, doing this relies on access to
+// the unsafe package.  This is a stub version which simply returns the passed
+// reflect.Value when the unsafe package is not available.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	return v
+}

vendor/github.com/davecgh/go-spew/spew/common.go

@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strconv"
+)
+
+// Some constants in the form of bytes to avoid string overhead.  This mirrors
+// the technique used in the fmt package.
+var (
+	panicBytes            = []byte("(PANIC=")
+	plusBytes             = []byte("+")
+	iBytes                = []byte("i")
+	trueBytes             = []byte("true")
+	falseBytes            = []byte("false")
+	interfaceBytes        = []byte("(interface {})")
+	commaNewlineBytes     = []byte(",\n")
+	newlineBytes          = []byte("\n")
+	openBraceBytes        = []byte("{")
+	openBraceNewlineBytes = []byte("{\n")
+	closeBraceBytes       = []byte("}")
+	asteriskBytes         = []byte("*")
+	colonBytes            = []byte(":")
+	colonSpaceBytes       = []byte(": ")
+	openParenBytes        = []byte("(")
+	closeParenBytes       = []byte(")")
+	spaceBytes            = []byte(" ")
+	pointerChainBytes     = []byte("->")
+	nilAngleBytes         = []byte("<nil>")
+	maxNewlineBytes       = []byte("<max depth reached>\n")
+	maxShortBytes         = []byte("<max>")
+	circularBytes         = []byte("<already shown>")
+	circularShortBytes    = []byte("<shown>")
+	invalidAngleBytes     = []byte("<invalid>")
+	openBracketBytes      = []byte("[")
+	closeBracketBytes     = []byte("]")
+	percentBytes          = []byte("%")
+	precisionBytes        = []byte(".")
+	openAngleBytes        = []byte("<")
+	closeAngleBytes       = []byte(">")
+	openMapBytes          = []byte("map[")
+	closeMapBytes         = []byte("]")
+	lenEqualsBytes        = []byte("len=")
+	capEqualsBytes        = []byte("cap=")
+)
+
+// hexDigits is used to map a decimal value to a hex digit.
+var hexDigits = "0123456789abcdef"
+
+// catchPanic handles any panics that might occur during the handleMethods
+// calls.
+func catchPanic(w io.Writer, v reflect.Value) {
+	if err := recover(); err != nil {
+		w.Write(panicBytes)
+		fmt.Fprintf(w, "%v", err)
+		w.Write(closeParenBytes)
+	}
+}
+
+// handleMethods attempts to call the Error and String methods on the underlying
+// type the passed reflect.Value represents and outputes the result to Writer w.
+//
+// It handles panics in any called methods by catching and displaying the error
+// as the formatted value.
+func handleMethods(cs *ConfigState, w io.Writer, v reflect.Value) (handled bool) {
+	// We need an interface to check if the type implements the error or
+	// Stringer interface.  However, the reflect package won't give us an
+	// interface on certain things like unexported struct fields in order
+	// to enforce visibility rules.  We use unsafe, when it's available,
+	// to bypass these restrictions since this package does not mutate the
+	// values.
+	if !v.CanInterface() {
+		if UnsafeDisabled {
+			return false
+		}
+
+		v = unsafeReflectValue(v)
+	}
+
+	// Choose whether or not to do error and Stringer interface lookups against
+	// the base type or a pointer to the base type depending on settings.
+	// Technically calling one of these methods with a pointer receiver can
+	// mutate the value, however, types which choose to satisify an error or
+	// Stringer interface with a pointer receiver should not be mutating their
+	// state inside these interface methods.
+	if !cs.DisablePointerMethods && !UnsafeDisabled && !v.CanAddr() {
+		v = unsafeReflectValue(v)
+	}
+	if v.CanAddr() {
+		v = v.Addr()
+	}
+
+	// Is it an error or Stringer?
+	switch iface := v.Interface().(type) {
+	case error:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.Error()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+
+		w.Write([]byte(iface.Error()))
+		return true
+
+	case fmt.Stringer:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.String()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+		w.Write([]byte(iface.String()))
+		return true
+	}
+	return false
+}
+
+// printBool outputs a boolean value as true or false to Writer w.
+func printBool(w io.Writer, val bool) {
+	if val {
+		w.Write(trueBytes)
+	} else {
+		w.Write(falseBytes)
+	}
+}
+
+// printInt outputs a signed integer value to Writer w.
+func printInt(w io.Writer, val int64, base int) {
+	w.Write([]byte(strconv.FormatInt(val, base)))
+}
+
+// printUint outputs an unsigned integer value to Writer w.
+func printUint(w io.Writer, val uint64, base int) {
+	w.Write([]byte(strconv.FormatUint(val, base)))
+}
+
+// printFloat outputs a floating point value using the specified precision,
+// which is expected to be 32 or 64bit, to Writer w.
+func printFloat(w io.Writer, val float64, precision int) {
+	w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
+}
+
+// printComplex outputs a complex value using the specified float precision
+// for the real and imaginary parts to Writer w.
+func printComplex(w io.Writer, c complex128, floatPrecision int) {
+	r := real(c)
+	w.Write(openParenBytes)
+	w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
+	i := imag(c)
+	if i >= 0 {
+		w.Write(plusBytes)
+	}
+	w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
+	w.Write(iBytes)
+	w.Write(closeParenBytes)
+}
+
+// printHexPtr outputs a uintptr formatted as hexadecimal with a leading '0x'
+// prefix to Writer w.
+func printHexPtr(w io.Writer, p uintptr) {
+	// Null pointer.
+	num := uint64(p)
+	if num == 0 {
+		w.Write(nilAngleBytes)
+		return
+	}
+
+	// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
+	buf := make([]byte, 18)
+
+	// It's simpler to construct the hex string right to left.
+	base := uint64(16)
+	i := len(buf) - 1
+	for num >= base {
+		buf[i] = hexDigits[num%base]
+		num /= base
+		i--
+	}
+	buf[i] = hexDigits[num]
+
+	// Add '0x' prefix.
+	i--
+	buf[i] = 'x'
+	i--
+	buf[i] = '0'
+
+	// Strip unused leading bytes.
+	buf = buf[i:]
+	w.Write(buf)
+}
+
+// valuesSorter implements sort.Interface to allow a slice of reflect.Value
+// elements to be sorted.
+type valuesSorter struct {
+	values  []reflect.Value
+	strings []string // either nil or same len and values
+	cs      *ConfigState
+}
+
+// newValuesSorter initializes a valuesSorter instance, which holds a set of
+// surrogate keys on which the data should be sorted.  It uses flags in
+// ConfigState to decide if and how to populate those surrogate keys.
+func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
+	vs := &valuesSorter{values: values, cs: cs}
+	if canSortSimply(vs.values[0].Kind()) {
+		return vs
+	}
+	if !cs.DisableMethods {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			b := bytes.Buffer{}
+			if !handleMethods(cs, &b, vs.values[i]) {
+				vs.strings = nil
+				break
+			}
+			vs.strings[i] = b.String()
+		}
+	}
+	if vs.strings == nil && cs.SpewKeys {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
+		}
+	}
+	return vs
+}
+
+// canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
+// directly, or whether it should be considered for sorting by surrogate keys
+// (if the ConfigState allows it).
+func canSortSimply(kind reflect.Kind) bool {
+	// This switch parallels valueSortLess, except for the default case.
+	switch kind {
+	case reflect.Bool:
+		return true
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return true
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return true
+	case reflect.Float32, reflect.Float64:
+		return true
+	case reflect.String:
+		return true
+	case reflect.Uintptr:
+		return true
+	case reflect.Array:
+		return true
+	}
+	return false
+}
+
+// Len returns the number of values in the slice.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Len() int {
+	return len(s.values)
+}
+
+// Swap swaps the values at the passed indices.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Swap(i, j int) {
+	s.values[i], s.values[j] = s.values[j], s.values[i]
+	if s.strings != nil {
+		s.strings[i], s.strings[j] = s.strings[j], s.strings[i]
+	}
+}
+
+// valueSortLess returns whether the first value should sort before the second
+// value.  It is used by valueSorter.Less as part of the sort.Interface
+// implementation.
+func valueSortLess(a, b reflect.Value) bool {
+	switch a.Kind() {
+	case reflect.Bool:
+		return !a.Bool() && b.Bool()
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return a.Int() < b.Int()
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return a.Uint() < b.Uint()
+	case reflect.Float32, reflect.Float64:
+		return a.Float() < b.Float()
+	case reflect.String:
+		return a.String() < b.String()
+	case reflect.Uintptr:
+		return a.Uint() < b.Uint()
+	case reflect.Array:
+		// Compare the contents of both arrays.
+		l := a.Len()
+		for i := 0; i < l; i++ {
+			av := a.Index(i)
+			bv := b.Index(i)
+			if av.Interface() == bv.Interface() {
+				continue
+			}
+			return valueSortLess(av, bv)
+		}
+	}
+	return a.String() < b.String()
+}
+
+// Less returns whether the value at index i should sort before the
+// value at index j.  It is part of the sort.Interface implementation.
+func (s *valuesSorter) Less(i, j int) bool {
+	if s.strings == nil {
+		return valueSortLess(s.values[i], s.values[j])
+	}
+	return s.strings[i] < s.strings[j]
+}
+
+// sortValues is a sort function that handles both native types and any type that
+// can be converted to error or Stringer.  Other inputs are sorted according to
+// their Value.String() value to ensure display stability.
+func sortValues(values []reflect.Value, cs *ConfigState) {
+	if len(values) == 0 {
+		return
+	}
+	sort.Sort(newValuesSorter(values, cs))
+}

vendor/github.com/davecgh/go-spew/spew/config.go

@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+)
+
+// ConfigState houses the configuration options used by spew to format and
+// display values.  There is a global instance, Config, that is used to control
+// all top-level Formatter and Dump functionality.  Each ConfigState instance
+// provides methods equivalent to the top-level functions.
+//
+// The zero value for ConfigState provides no indentation.  You would typically
+// want to set it to a space or a tab.
+//
+// Alternatively, you can use NewDefaultConfig to get a ConfigState instance
+// with default settings.  See the documentation of NewDefaultConfig for default
+// values.
+type ConfigState struct {
+	// Indent specifies the string to use for each indentation level.  The
+	// global config instance that all top-level functions use set this to a
+	// single space by default.  If you would like more indentation, you might
+	// set this to a tab with "\t" or perhaps two spaces with "  ".
+	Indent string
+
+	// MaxDepth controls the maximum number of levels to descend into nested
+	// data structures.  The default, 0, means there is no limit.
+	//
+	// NOTE: Circular data structures are properly detected, so it is not
+	// necessary to set this value unless you specifically want to limit deeply
+	// nested data structures.
+	MaxDepth int
+
+	// DisableMethods specifies whether or not error and Stringer interfaces are
+	// invoked for types that implement them.
+	DisableMethods bool
+
+	// DisablePointerMethods specifies whether or not to check for and invoke
+	// error and Stringer interfaces on types which only accept a pointer
+	// receiver when the current type is not a pointer.
+	//
+	// NOTE: This might be an unsafe action since calling one of these methods
+	// with a pointer receiver could technically mutate the value, however,
+	// in practice, types which choose to satisify an error or Stringer
+	// interface with a pointer receiver should not be mutating their state
+	// inside these interface methods.  As a result, this option relies on
+	// access to the unsafe package, so it will not have any effect when
+	// running in environments without access to the unsafe package such as
+	// Google App Engine or with the "safe" build tag specified.
+	DisablePointerMethods bool
+
+	// DisablePointerAddresses specifies whether to disable the printing of
+	// pointer addresses. This is useful when diffing data structures in tests.
+	DisablePointerAddresses bool
+
+	// DisableCapacities specifies whether to disable the printing of capacities
+	// for arrays, slices, maps and channels. This is useful when diffing
+	// data structures in tests.
+	DisableCapacities bool
+
+	// ContinueOnMethod specifies whether or not recursion should continue once
+	// a custom error or Stringer interface is invoked.  The default, false,
+	// means it will print the results of invoking the custom error or Stringer
+	// interface and return immediately instead of continuing to recurse into
+	// the internals of the data type.
+	//
+	// NOTE: This flag does not have any effect if method invocation is disabled
+	// via the DisableMethods or DisablePointerMethods options.
+	ContinueOnMethod bool
+
+	// SortKeys specifies map keys should be sorted before being printed. Use
+	// this to have a more deterministic, diffable output.  Note that only
+	// native types (bool, int, uint, floats, uintptr and string) and types
+	// that support the error or Stringer interfaces (if methods are
+	// enabled) are supported, with other types sorted according to the
+	// reflect.Value.String() output which guarantees display stability.
+	SortKeys bool
+
+	// SpewKeys specifies that, as a last resort attempt, map keys should
+	// be spewed to strings and sorted by those strings.  This is only
+	// considered if SortKeys is true.
+	SpewKeys bool
+}
+
+// Config is the active configuration of the top-level functions.
+// The configuration can be changed by modifying the contents of spew.Config.
+var Config = ConfigState{Indent: " "}
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the formatted string as a value that satisfies error.  See NewFormatter
+// for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, c.convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, c.convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, c.convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a Formatter interface returned by c.NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, c.convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(c.convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, c.convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(c.convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprint(a ...interface{}) string {
+	return fmt.Sprint(c.convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, c.convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a Formatter interface returned by c.NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(c.convertArgs(a)...)
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+c.Printf, c.Println, or c.Printf.
+*/
+func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(c, v)
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
+	fdump(c, w, a...)
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by modifying the public members
+of c.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func (c *ConfigState) Dump(a ...interface{}) {
+	fdump(c, os.Stdout, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func (c *ConfigState) Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(c, &buf, a...)
+	return buf.String()
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a spew Formatter interface using
+// the ConfigState associated with s.
+func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = newFormatter(c, arg)
+	}
+	return formatters
+}
+
+// NewDefaultConfig returns a ConfigState with the following default settings.
+//
+// 	Indent: " "
+// 	MaxDepth: 0
+// 	DisableMethods: false
+// 	DisablePointerMethods: false
+// 	ContinueOnMethod: false
+// 	SortKeys: false
+func NewDefaultConfig() *ConfigState {
+	return &ConfigState{Indent: " "}
+}

vendor/github.com/davecgh/go-spew/spew/doc.go

@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+Package spew implements a deep pretty printer for Go data structures to aid in
+debugging.
+
+A quick overview of the additional features spew provides over the built-in
+printing facilities for Go data types are as follows:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output (only when using
+	  Dump style)
+
+There are two different approaches spew allows for dumping Go data structures:
+
+	* Dump style which prints with newlines, customizable indentation,
+	  and additional debug information such as types and all pointer addresses
+	  used to indirect to the final value
+	* A custom Formatter interface that integrates cleanly with the standard fmt
+	  package and replaces %v, %+v, %#v, and %#+v to provide inline printing
+	  similar to the default %v while providing the additional functionality
+	  outlined above and passing unsupported format verbs such as %x and %q
+	  along to fmt
+
+Quick Start
+
+This section demonstrates how to quickly get started with spew.  See the
+sections below for further details on formatting and configuration options.
+
+To dump a variable with full newlines, indentation, type, and pointer
+information use Dump, Fdump, or Sdump:
+	spew.Dump(myVar1, myVar2, ...)
+	spew.Fdump(someWriter, myVar1, myVar2, ...)
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Alternatively, if you would prefer to use format strings with a compacted inline
+printing style, use the convenience wrappers Printf, Fprintf, etc with
+%v (most compact), %+v (adds pointer addresses), %#v (adds types), or
+%#+v (adds types and pointer addresses):
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Fprintf(someWriter, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(someWriter, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+Configuration Options
+
+Configuration of spew is handled by fields in the ConfigState type.  For
+convenience, all of the top-level functions use a global state available
+via the spew.Config global.
+
+It is also possible to create a ConfigState instance that provides methods
+equivalent to the top-level functions.  This allows concurrent configuration
+options.  See the ConfigState documentation for more details.
+
+The following configuration options are available:
+	* Indent
+		String to use for each indentation level for Dump functions.
+		It is a single space by default.  A popular alternative is "\t".
+
+	* MaxDepth
+		Maximum number of levels to descend into nested data structures.
+		There is no limit by default.
+
+	* DisableMethods
+		Disables invocation of error and Stringer interface methods.
+		Method invocation is enabled by default.
+
+	* DisablePointerMethods
+		Disables invocation of error and Stringer interface methods on types
+		which only accept pointer receivers from non-pointer variables.
+		Pointer method invocation is enabled by default.
+
+	* DisablePointerAddresses
+		DisablePointerAddresses specifies whether to disable the printing of
+		pointer addresses. This is useful when diffing data structures in tests.
+
+	* DisableCapacities
+		DisableCapacities specifies whether to disable the printing of
+		capacities for arrays, slices, maps and channels. This is useful when
+		diffing data structures in tests.
+
+	* ContinueOnMethod
+		Enables recursion into types after invoking error and Stringer interface
+		methods. Recursion after method invocation is disabled by default.
+
+	* SortKeys
+		Specifies map keys should be sorted before being printed. Use
+		this to have a more deterministic, diffable output.  Note that
+		only native types (bool, int, uint, floats, uintptr and string)
+		and types which implement error or Stringer interfaces are
+		supported with other types sorted according to the
+		reflect.Value.String() output which guarantees display
+		stability.  Natural map order is used by default.
+
+	* SpewKeys
+		Specifies that, as a last resort attempt, map keys should be
+		spewed to strings and sorted by those strings.  This is only
+		considered if SortKeys is true.
+
+Dump Usage
+
+Simply call spew.Dump with a list of variables you want to dump:
+
+	spew.Dump(myVar1, myVar2, ...)
+
+You may also call spew.Fdump if you would prefer to output to an arbitrary
+io.Writer.  For example, to dump to standard error:
+
+	spew.Fdump(os.Stderr, myVar1, myVar2, ...)
+
+A third option is to call spew.Sdump to get the formatted output as a string:
+
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Sample Dump Output
+
+See the Dump example for details on the setup of the types and variables being
+shown here.
+
+	(main.Foo) {
+	 unexportedField: (*main.Bar)(0xf84002e210)({
+	  flag: (main.Flag) flagTwo,
+	  data: (uintptr) <nil>
+	 }),
+	 ExportedField: (map[interface {}]interface {}) (len=1) {
+	  (string) (len=3) "one": (bool) true
+	 }
+	}
+
+Byte (and uint8) arrays and slices are displayed uniquely like the hexdump -C
+command as shown.
+	([]uint8) (len=32 cap=32) {
+	 00000000  11 12 13 14 15 16 17 18  19 1a 1b 1c 1d 1e 1f 20  |............... |
+	 00000010  21 22 23 24 25 26 27 28  29 2a 2b 2c 2d 2e 2f 30  |!"#$%&'()*+,-./0|
+	 00000020  31 32                                             |12|
+	}
+
+Custom Formatter
+
+Spew provides a custom formatter that implements the fmt.Formatter interface
+so that it integrates cleanly with standard fmt package printing functions. The
+formatter is useful for inline printing of smaller data types similar to the
+standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Custom Formatter Usage
+
+The simplest way to make use of the spew custom formatter is to call one of the
+convenience functions such as spew.Printf, spew.Println, or spew.Printf.  The
+functions have syntax you are most likely already familiar with:
+
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Println(myVar, myVar2)
+	spew.Fprintf(os.Stderr, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(os.Stderr, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+See the Index for the full list convenience functions.
+
+Sample Formatter Output
+
+Double pointer to a uint8:
+	  %v: <**>5
+	 %+v: <**>(0xf8400420d0->0xf8400420c8)5
+	 %#v: (**uint8)5
+	%#+v: (**uint8)(0xf8400420d0->0xf8400420c8)5
+
+Pointer to circular struct with a uint8 field and a pointer to itself:
+	  %v: <*>{1 <*><shown>}
+	 %+v: <*>(0xf84003e260){ui8:1 c:<*>(0xf84003e260)<shown>}
+	 %#v: (*main.circular){ui8:(uint8)1 c:(*main.circular)<shown>}
+	%#+v: (*main.circular)(0xf84003e260){ui8:(uint8)1 c:(*main.circular)(0xf84003e260)<shown>}
+
+See the Printf example for details on the setup of variables being shown
+here.
+
+Errors
+
+Since it is possible for custom Stringer/error interfaces to panic, spew
+detects them and handles them internally by printing the panic information
+inline with the output.  Since spew is intended to provide deep pretty printing
+capabilities on structures, it intentionally does not return any errors.
+*/
+package spew

vendor/github.com/davecgh/go-spew/spew/dump.go

@@ -0,0 +1,509 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var (
+	// uint8Type is a reflect.Type representing a uint8.  It is used to
+	// convert cgo types to uint8 slices for hexdumping.
+	uint8Type = reflect.TypeOf(uint8(0))
+
+	// cCharRE is a regular expression that matches a cgo char.
+	// It is used to detect character arrays to hexdump them.
+	cCharRE = regexp.MustCompile(`^.*\._Ctype_char$`)
+
+	// cUnsignedCharRE is a regular expression that matches a cgo unsigned
+	// char.  It is used to detect unsigned character arrays to hexdump
+	// them.
+	cUnsignedCharRE = regexp.MustCompile(`^.*\._Ctype_unsignedchar$`)
+
+	// cUint8tCharRE is a regular expression that matches a cgo uint8_t.
+	// It is used to detect uint8_t arrays to hexdump them.
+	cUint8tCharRE = regexp.MustCompile(`^.*\._Ctype_uint8_t$`)
+)
+
+// dumpState contains information about the state of a dump operation.
+type dumpState struct {
+	w                io.Writer
+	depth            int
+	pointers         map[uintptr]int
+	ignoreNextType   bool
+	ignoreNextIndent bool
+	cs               *ConfigState
+}
+
+// indent performs indentation according to the depth level and cs.Indent
+// option.
+func (d *dumpState) indent() {
+	if d.ignoreNextIndent {
+		d.ignoreNextIndent = false
+		return
+	}
+	d.w.Write(bytes.Repeat([]byte(d.cs.Indent), d.depth))
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (d *dumpState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface && !v.IsNil() {
+		v = v.Elem()
+	}
+	return v
+}
+
+// dumpPtr handles formatting of pointers by indirecting them as necessary.
+func (d *dumpState) dumpPtr(v reflect.Value) {
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range d.pointers {
+		if depth >= d.depth {
+			delete(d.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by dereferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := d.pointers[addr]; ok && pd < d.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		d.pointers[addr] = d.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type information.
+	d.w.Write(openParenBytes)
+	d.w.Write(bytes.Repeat(asteriskBytes, indirects))
+	d.w.Write([]byte(ve.Type().String()))
+	d.w.Write(closeParenBytes)
+
+	// Display pointer information.
+	if !d.cs.DisablePointerAddresses && len(pointerChain) > 0 {
+		d.w.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				d.w.Write(pointerChainBytes)
+			}
+			printHexPtr(d.w, addr)
+		}
+		d.w.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	d.w.Write(openParenBytes)
+	switch {
+	case nilFound:
+		d.w.Write(nilAngleBytes)
+
+	case cycleFound:
+		d.w.Write(circularBytes)
+
+	default:
+		d.ignoreNextType = true
+		d.dump(ve)
+	}
+	d.w.Write(closeParenBytes)
+}
+
+// dumpSlice handles formatting of arrays and slices.  Byte (uint8 under
+// reflection) arrays and slices are dumped in hexdump -C fashion.
+func (d *dumpState) dumpSlice(v reflect.Value) {
+	// Determine whether this type should be hex dumped or not.  Also,
+	// for types which should be hexdumped, try to use the underlying data
+	// first, then fall back to trying to convert them to a uint8 slice.
+	var buf []uint8
+	doConvert := false
+	doHexDump := false
+	numEntries := v.Len()
+	if numEntries > 0 {
+		vt := v.Index(0).Type()
+		vts := vt.String()
+		switch {
+		// C types that need to be converted.
+		case cCharRE.MatchString(vts):
+			fallthrough
+		case cUnsignedCharRE.MatchString(vts):
+			fallthrough
+		case cUint8tCharRE.MatchString(vts):
+			doConvert = true
+
+		// Try to use existing uint8 slices and fall back to converting
+		// and copying if that fails.
+		case vt.Kind() == reflect.Uint8:
+			// We need an addressable interface to convert the type
+			// to a byte slice.  However, the reflect package won't
+			// give us an interface on certain things like
+			// unexported struct fields in order to enforce
+			// visibility rules.  We use unsafe, when available, to
+			// bypass these restrictions since this package does not
+			// mutate the values.
+			vs := v
+			if !vs.CanInterface() || !vs.CanAddr() {
+				vs = unsafeReflectValue(vs)
+			}
+			if !UnsafeDisabled {
+				vs = vs.Slice(0, numEntries)
+
+				// Use the existing uint8 slice if it can be
+				// type asserted.
+				iface := vs.Interface()
+				if slice, ok := iface.([]uint8); ok {
+					buf = slice
+					doHexDump = true
+					break
+				}
+			}
+
+			// The underlying data needs to be converted if it can't
+			// be type asserted to a uint8 slice.
+			doConvert = true
+		}
+
+		// Copy and convert the underlying type if needed.
+		if doConvert && vt.ConvertibleTo(uint8Type) {
+			// Convert and copy each element into a uint8 byte
+			// slice.
+			buf = make([]uint8, numEntries)
+			for i := 0; i < numEntries; i++ {
+				vv := v.Index(i)
+				buf[i] = uint8(vv.Convert(uint8Type).Uint())
+			}
+			doHexDump = true
+		}
+	}
+
+	// Hexdump the entire slice as needed.
+	if doHexDump {
+		indent := strings.Repeat(d.cs.Indent, d.depth)
+		str := indent + hex.Dump(buf)
+		str = strings.Replace(str, "\n", "\n"+indent, -1)
+		str = strings.TrimRight(str, d.cs.Indent)
+		d.w.Write([]byte(str))
+		return
+	}
+
+	// Recursively call dump for each item.
+	for i := 0; i < numEntries; i++ {
+		d.dump(d.unpackValue(v.Index(i)))
+		if i < (numEntries - 1) {
+			d.w.Write(commaNewlineBytes)
+		} else {
+			d.w.Write(newlineBytes)
+		}
+	}
+}
+
+// dump is the main workhorse for dumping a value.  It uses the passed reflect
+// value to figure out what kind of object we are dealing with and formats it
+// appropriately.  It is a recursive function, however circular data structures
+// are detected and handled properly.
+func (d *dumpState) dump(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		d.w.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		d.indent()
+		d.dumpPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !d.ignoreNextType {
+		d.indent()
+		d.w.Write(openParenBytes)
+		d.w.Write([]byte(v.Type().String()))
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+	d.ignoreNextType = false
+
+	// Display length and capacity if the built-in len and cap functions
+	// work with the value's kind and the len/cap itself is non-zero.
+	valueLen, valueCap := 0, 0
+	switch v.Kind() {
+	case reflect.Array, reflect.Slice, reflect.Chan:
+		valueLen, valueCap = v.Len(), v.Cap()
+	case reflect.Map, reflect.String:
+		valueLen = v.Len()
+	}
+	if valueLen != 0 || !d.cs.DisableCapacities && valueCap != 0 {
+		d.w.Write(openParenBytes)
+		if valueLen != 0 {
+			d.w.Write(lenEqualsBytes)
+			printInt(d.w, int64(valueLen), 10)
+		}
+		if !d.cs.DisableCapacities && valueCap != 0 {
+			if valueLen != 0 {
+				d.w.Write(spaceBytes)
+			}
+			d.w.Write(capEqualsBytes)
+			printInt(d.w, int64(valueCap), 10)
+		}
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+
+	// Call Stringer/error interfaces if they exist and the handle methods flag
+	// is enabled
+	if !d.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(d.cs, d.w, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(d.w, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(d.w, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(d.w, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(d.w, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(d.w, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(d.w, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(d.w, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			d.dumpSlice(v)
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.String:
+		d.w.Write([]byte(strconv.Quote(v.String())))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			numEntries := v.Len()
+			keys := v.MapKeys()
+			if d.cs.SortKeys {
+				sortValues(keys, d.cs)
+			}
+			for i, key := range keys {
+				d.dump(d.unpackValue(key))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.MapIndex(key)))
+				if i < (numEntries - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Struct:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			vt := v.Type()
+			numFields := v.NumField()
+			for i := 0; i < numFields; i++ {
+				d.indent()
+				vtf := vt.Field(i)
+				d.w.Write([]byte(vtf.Name))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.Field(i)))
+				if i < (numFields - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(d.w, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(d.w, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it in case any new
+	// types are added.
+	default:
+		if v.CanInterface() {
+			fmt.Fprintf(d.w, "%v", v.Interface())
+		} else {
+			fmt.Fprintf(d.w, "%v", v.String())
+		}
+	}
+}
+
+// fdump is a helper function to consolidate the logic from the various public
+// methods which take varying writers and config states.
+func fdump(cs *ConfigState, w io.Writer, a ...interface{}) {
+	for _, arg := range a {
+		if arg == nil {
+			w.Write(interfaceBytes)
+			w.Write(spaceBytes)
+			w.Write(nilAngleBytes)
+			w.Write(newlineBytes)
+			continue
+		}
+
+		d := dumpState{w: w, cs: cs}
+		d.pointers = make(map[uintptr]int)
+		d.dump(reflect.ValueOf(arg))
+		d.w.Write(newlineBytes)
+	}
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func Fdump(w io.Writer, a ...interface{}) {
+	fdump(&Config, w, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(&Config, &buf, a...)
+	return buf.String()
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by an exported package global,
+spew.Config.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func Dump(a ...interface{}) {
+	fdump(&Config, os.Stdout, a...)
+}

vendor/github.com/davecgh/go-spew/spew/format.go

@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// supportedFlags is a list of all the character flags supported by fmt package.
+const supportedFlags = "0-+# "
+
+// formatState implements the fmt.Formatter interface and contains information
+// about the state of a formatting operation.  The NewFormatter function can
+// be used to get a new Formatter which can be used directly as arguments
+// in standard fmt package printing calls.
+type formatState struct {
+	value          interface{}
+	fs             fmt.State
+	depth          int
+	pointers       map[uintptr]int
+	ignoreNextType bool
+	cs             *ConfigState
+}
+
+// buildDefaultFormat recreates the original format string without precision
+// and width information to pass in to fmt.Sprintf in the case of an
+// unrecognized type.  Unless new types are added to the language, this
+// function won't ever be called.
+func (f *formatState) buildDefaultFormat() (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	buf.WriteRune('v')
+
+	format = buf.String()
+	return format
+}
+
+// constructOrigFormat recreates the original format string including precision
+// and width information to pass along to the standard fmt package.  This allows
+// automatic deferral of all format strings this package doesn't support.
+func (f *formatState) constructOrigFormat(verb rune) (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	if width, ok := f.fs.Width(); ok {
+		buf.WriteString(strconv.Itoa(width))
+	}
+
+	if precision, ok := f.fs.Precision(); ok {
+		buf.Write(precisionBytes)
+		buf.WriteString(strconv.Itoa(precision))
+	}
+
+	buf.WriteRune(verb)
+
+	format = buf.String()
+	return format
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible and
+// ensures that types for values which have been unpacked from an interface
+// are displayed when the show types flag is also set.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (f *formatState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface {
+		f.ignoreNextType = false
+		if !v.IsNil() {
+			v = v.Elem()
+		}
+	}
+	return v
+}
+
+// formatPtr handles formatting of pointers by indirecting them as necessary.
+func (f *formatState) formatPtr(v reflect.Value) {
+	// Display nil if top level pointer is nil.
+	showTypes := f.fs.Flag('#')
+	if v.IsNil() && (!showTypes || f.ignoreNextType) {
+		f.fs.Write(nilAngleBytes)
+		return
+	}
+
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range f.pointers {
+		if depth >= f.depth {
+			delete(f.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to possibly show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by derferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		f.pointers[addr] = f.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type or indirection level depending on flags.
+	if showTypes && !f.ignoreNextType {
+		f.fs.Write(openParenBytes)
+		f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
+		f.fs.Write([]byte(ve.Type().String()))
+		f.fs.Write(closeParenBytes)
+	} else {
+		if nilFound || cycleFound {
+			indirects += strings.Count(ve.Type().String(), "*")
+		}
+		f.fs.Write(openAngleBytes)
+		f.fs.Write([]byte(strings.Repeat("*", indirects)))
+		f.fs.Write(closeAngleBytes)
+	}
+
+	// Display pointer information depending on flags.
+	if f.fs.Flag('+') && (len(pointerChain) > 0) {
+		f.fs.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				f.fs.Write(pointerChainBytes)
+			}
+			printHexPtr(f.fs, addr)
+		}
+		f.fs.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	switch {
+	case nilFound:
+		f.fs.Write(nilAngleBytes)
+
+	case cycleFound:
+		f.fs.Write(circularShortBytes)
+
+	default:
+		f.ignoreNextType = true
+		f.format(ve)
+	}
+}
+
+// format is the main workhorse for providing the Formatter interface.  It
+// uses the passed reflect value to figure out what kind of object we are
+// dealing with and formats it appropriately.  It is a recursive function,
+// however circular data structures are detected and handled properly.
+func (f *formatState) format(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		f.fs.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		f.formatPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !f.ignoreNextType && f.fs.Flag('#') {
+		f.fs.Write(openParenBytes)
+		f.fs.Write([]byte(v.Type().String()))
+		f.fs.Write(closeParenBytes)
+	}
+	f.ignoreNextType = false
+
+	// Call Stringer/error interfaces if they exist and the handle methods
+	// flag is enabled.
+	if !f.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(f.cs, f.fs, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(f.fs, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(f.fs, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(f.fs, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(f.fs, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(f.fs, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(f.fs, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(f.fs, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		f.fs.Write(openBracketBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			numEntries := v.Len()
+			for i := 0; i < numEntries; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.Index(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBracketBytes)
+
+	case reflect.String:
+		f.fs.Write([]byte(v.String()))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+
+		f.fs.Write(openMapBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			keys := v.MapKeys()
+			if f.cs.SortKeys {
+				sortValues(keys, f.cs)
+			}
+			for i, key := range keys {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(key))
+				f.fs.Write(colonBytes)
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.MapIndex(key)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeMapBytes)
+
+	case reflect.Struct:
+		numFields := v.NumField()
+		f.fs.Write(openBraceBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			vt := v.Type()
+			for i := 0; i < numFields; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				vtf := vt.Field(i)
+				if f.fs.Flag('+') || f.fs.Flag('#') {
+					f.fs.Write([]byte(vtf.Name))
+					f.fs.Write(colonBytes)
+				}
+				f.format(f.unpackValue(v.Field(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(f.fs, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(f.fs, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it if any get added.
+	default:
+		format := f.buildDefaultFormat()
+		if v.CanInterface() {
+			fmt.Fprintf(f.fs, format, v.Interface())
+		} else {
+			fmt.Fprintf(f.fs, format, v.String())
+		}
+	}
+}
+
+// Format satisfies the fmt.Formatter interface. See NewFormatter for usage
+// details.
+func (f *formatState) Format(fs fmt.State, verb rune) {
+	f.fs = fs
+
+	// Use standard formatting for verbs that are not v.
+	if verb != 'v' {
+		format := f.constructOrigFormat(verb)
+		fmt.Fprintf(fs, format, f.value)
+		return
+	}
+
+	if f.value == nil {
+		if fs.Flag('#') {
+			fs.Write(interfaceBytes)
+		}
+		fs.Write(nilAngleBytes)
+		return
+	}
+
+	f.format(reflect.ValueOf(f.value))
+}
+
+// newFormatter is a helper function to consolidate the logic from the various
+// public methods which take varying config states.
+func newFormatter(cs *ConfigState, v interface{}) fmt.Formatter {
+	fs := &formatState{value: v, cs: cs}
+	fs.pointers = make(map[uintptr]int)
+	return fs
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+Printf, Println, or Fprintf.
+*/
+func NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(&Config, v)
+}

vendor/github.com/davecgh/go-spew/spew/spew.go

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"fmt"
+	"io"
+)
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the formatted string as a value that satisfies error.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a default Formatter interface returned by NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))
+func Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))
+func Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprint(a ...interface{}) string {
+	return fmt.Sprint(convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(convertArgs(a)...)
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a default spew Formatter interface.
+func convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = NewFormatter(arg)
+	}
+	return formatters
+}

vendor/github.com/sirupsen/logrus/.gitignore

@@ -0,0 +1,4 @@
+logrus
+vendor
+
+.idea/

vendor/github.com/sirupsen/logrus/.golangci.yml

@@ -0,0 +1,40 @@
+run:
+  # do not run on test files yet
+  tests: false
+
+# all available settings of specific linters
+linters-settings:
+  errcheck:
+    # report about not checking of errors in type assetions: `a := b.(MyStruct)`;
+    # default is false: such cases aren't reported by default.
+    check-type-assertions: false
+
+    # report about assignment of errors to blank identifier: `num, _ := strconv.Atoi(numStr)`;
+    # default is false: such cases aren't reported by default.
+    check-blank: false
+
+  lll:
+    line-length: 100
+    tab-width: 4
+
+  prealloc:
+    simple: false
+    range-loops: false
+    for-loops: false
+
+  whitespace:
+    multi-if: false   # Enforces newlines (or comments) after every multi-line if statement
+    multi-func: false # Enforces newlines (or comments) after every multi-line function signature
+
+linters:
+  enable:
+    - megacheck
+    - govet
+  disable:
+    - maligned
+    - prealloc
+  disable-all: false
+  presets:
+    - bugs
+    - unused
+  fast: false

vendor/github.com/sirupsen/logrus/.travis.yml

@@ -0,0 +1,17 @@
+language: go
+go_import_path: github.com/sirupsen/logrus
+git:
+  depth: 1
+env:
+  - GO111MODULE=on
+go: [1.13.x, 1.14.x]
+os: [linux, osx]
+install:
+  - ./travis/install.sh
+script:
+  - ./travis/cross_build.sh
+  - ./travis/lint.sh
+  - export GOMAXPROCS=4
+  - export GORACE=halt_on_error=1
+  - go test -race -v ./...
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then go test -race -v -tags appengine ./... ; fi

vendor/github.com/sirupsen/logrus/CHANGELOG.md

@@ -0,0 +1,223 @@
+# 1.6.0
+Fixes:
+  * end of line cleanup
+  * revert the entry concurrency bug fix whic leads to deadlock under some circumstances
+  * update dependency on go-windows-terminal-sequences to fix a crash with go 1.14
+
+Features:
+  * add an option to the `TextFormatter` to completely disable fields quoting
+
+# 1.5.0
+Code quality:
+  * add golangci linter run on travis
+
+Fixes:
+  * add mutex for hooks concurrent access on `Entry` data
+  * caller function field for go1.14
+  * fix build issue for gopherjs target
+
+Feature:
+  * add an hooks/writer sub-package whose goal is to split output on different stream depending on the trace level
+  * add a `DisableHTMLEscape` option in the `JSONFormatter`
+  * add `ForceQuote` and `PadLevelText` options in the `TextFormatter`
+
+# 1.4.2
+  * Fixes build break for plan9, nacl, solaris
+# 1.4.1
+This new release introduces:
+  * Enhance TextFormatter to not print caller information when they are empty (#944)
+  * Remove dependency on golang.org/x/crypto (#932, #943)
+
+Fixes:
+  * Fix Entry.WithContext method to return a copy of the initial entry (#941)
+
+# 1.4.0
+This new release introduces:
+  * Add `DeferExitHandler`, similar to `RegisterExitHandler` but prepending the handler to the list of handlers (semantically like `defer`) (#848).
+  * Add `CallerPrettyfier` to `JSONFormatter` and `TextFormatter` (#909, #911)
+  * Add `Entry.WithContext()` and `Entry.Context`, to set a context on entries to be used e.g. in hooks (#919).
+
+Fixes:
+  * Fix wrong method calls `Logger.Print` and `Logger.Warningln` (#893).
+  * Update `Entry.Logf` to not do string formatting unless the log level is enabled (#903)
+  * Fix infinite recursion on unknown `Level.String()` (#907)
+  * Fix race condition in `getCaller` (#916).
+
+
+# 1.3.0
+This new release introduces:
+  * Log, Logf, Logln functions for Logger and Entry that take a Level
+
+Fixes:
+  * Building prometheus node_exporter on AIX (#840)
+  * Race condition in TextFormatter (#468)
+  * Travis CI import path (#868)
+  * Remove coloured output on Windows (#862)
+  * Pointer to func as field in JSONFormatter (#870)
+  * Properly marshal Levels (#873)
+
+# 1.2.0
+This new release introduces:
+  * A new method `SetReportCaller` in the `Logger` to enable the file, line and calling function from which the trace has been issued
+  * A new trace level named `Trace` whose level is below `Debug`
+  * A configurable exit function to be called upon a Fatal trace
+  * The `Level` object now implements `encoding.TextUnmarshaler` interface
+
+# 1.1.1
+This is a bug fix release.
+  * fix the build break on Solaris
+  * don't drop a whole trace in JSONFormatter when a field param is a function pointer which can not be serialized
+
+# 1.1.0
+This new release introduces:
+  * several fixes:
+    * a fix for a race condition on entry formatting
+    * proper cleanup of previously used entries before putting them back in the pool
+    * the extra new line at the end of message in text formatter has been removed
+  * a new global public API to check if a level is activated: IsLevelEnabled
+  * the following methods have been added to the Logger object
+    * IsLevelEnabled
+    * SetFormatter
+    * SetOutput
+    * ReplaceHooks
+  * introduction of go module
+  * an indent configuration for the json formatter
+  * output colour support for windows
+  * the field sort function is now configurable for text formatter
+  * the CLICOLOR and CLICOLOR\_FORCE environment variable support in text formater
+
+# 1.0.6
+
+This new release introduces:
+  * a new api WithTime which allows to easily force the time of the log entry
+    which is mostly useful for logger wrapper
+  * a fix reverting the immutability of the entry given as parameter to the hooks
+    a new configuration field of the json formatter in order to put all the fields
+    in a nested dictionnary
+  * a new SetOutput method in the Logger
+  * a new configuration of the textformatter to configure the name of the default keys
+  * a new configuration of the text formatter to disable the level truncation
+
+# 1.0.5
+
+* Fix hooks race (#707)
+* Fix panic deadlock (#695)
+
+# 1.0.4
+
+* Fix race when adding hooks (#612)
+* Fix terminal check in AppEngine (#635)
+
+# 1.0.3
+
+* Replace example files with testable examples
+
+# 1.0.2
+
+* bug: quote non-string values in text formatter (#583)
+* Make (*Logger) SetLevel a public method
+
+# 1.0.1
+
+* bug: fix escaping in text formatter (#575)
+
+# 1.0.0
+
+* Officially changed name to lower-case
+* bug: colors on Windows 10 (#541)
+* bug: fix race in accessing level (#512)
+
+# 0.11.5
+
+* feature: add writer and writerlevel to entry (#372)
+
+# 0.11.4
+
+* bug: fix undefined variable on solaris (#493)
+
+# 0.11.3
+
+* formatter: configure quoting of empty values (#484)
+* formatter: configure quoting character (default is `"`) (#484)
+* bug: fix not importing io correctly in non-linux environments (#481)
+
+# 0.11.2
+
+* bug: fix windows terminal detection (#476)
+
+# 0.11.1
+
+* bug: fix tty detection with custom out (#471)
+
+# 0.11.0
+
+* performance: Use bufferpool to allocate (#370)
+* terminal: terminal detection for app-engine (#343)
+* feature: exit handler (#375)
+
+# 0.10.0
+
+* feature: Add a test hook (#180)
+* feature: `ParseLevel` is now case-insensitive (#326)
+* feature: `FieldLogger` interface that generalizes `Logger` and `Entry` (#308)
+* performance: avoid re-allocations on `WithFields` (#335)
+
+# 0.9.0
+
+* logrus/text_formatter: don't emit empty msg
+* logrus/hooks/airbrake: move out of main repository
+* logrus/hooks/sentry: move out of main repository
+* logrus/hooks/papertrail: move out of main repository
+* logrus/hooks/bugsnag: move out of main repository
+* logrus/core: run tests with `-race`
+* logrus/core: detect TTY based on `stderr`
+* logrus/core: support `WithError` on logger
+* logrus/core: Solaris support
+
+# 0.8.7
+
+* logrus/core: fix possible race (#216)
+* logrus/doc: small typo fixes and doc improvements
+
+
+# 0.8.6
+
+* hooks/raven: allow passing an initialized client
+
+# 0.8.5
+
+* logrus/core: revert #208
+
+# 0.8.4
+
+* formatter/text: fix data race (#218)
+
+# 0.8.3
+
+* logrus/core: fix entry log level (#208)
+* logrus/core: improve performance of text formatter by 40%
+* logrus/core: expose `LevelHooks` type
+* logrus/core: add support for DragonflyBSD and NetBSD
+* formatter/text: print structs more verbosely
+
+# 0.8.2
+
+* logrus: fix more Fatal family functions
+
+# 0.8.1
+
+* logrus: fix not exiting on `Fatalf` and `Fatalln`
+
+# 0.8.0
+
+* logrus: defaults to stderr instead of stdout
+* hooks/sentry: add special field for `*http.Request`
+* formatter/text: ignore Windows for colors
+
+# 0.7.3
+
+* formatter/\*: allow configuration of timestamp layout
+
+# 0.7.2
+
+* formatter/text: Add configuration option for time format (#158)

vendor/github.com/sirupsen/logrus/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Simon Eskildsen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/github.com/sirupsen/logrus/README.md

@@ -0,0 +1,513 @@
+# Logrus <img src="http://i.imgur.com/hTeVwmJ.png" width="40" height="40" alt=":walrus:" class="emoji" title=":walrus:"/> [![Build Status](https://travis-ci.org/sirupsen/logrus.svg?branch=master)](https://travis-ci.org/sirupsen/logrus) [![GoDoc](https://godoc.org/github.com/sirupsen/logrus?status.svg)](https://godoc.org/github.com/sirupsen/logrus)
+
+Logrus is a structured logger for Go (golang), completely API compatible with
+the standard library logger.
+
+**Logrus is in maintenance-mode.** We will not be introducing new features. It's
+simply too hard to do in a way that won't break many people's projects, which is
+the last thing you want from your Logging library (again...).
+
+This does not mean Logrus is dead. Logrus will continue to be maintained for
+security, (backwards compatible) bug fixes, and performance (where we are
+limited by the interface). 
+
+I believe Logrus' biggest contribution is to have played a part in today's
+widespread use of structured logging in Golang. There doesn't seem to be a
+reason to do a major, breaking iteration into Logrus V2, since the fantastic Go
+community has built those independently. Many fantastic alternatives have sprung
+up. Logrus would look like those, had it been re-designed with what we know
+about structured logging in Go today. Check out, for example,
+[Zerolog][zerolog], [Zap][zap], and [Apex][apex].
+
+[zerolog]: https://github.com/rs/zerolog
+[zap]: https://github.com/uber-go/zap
+[apex]: https://github.com/apex/log
+
+**Seeing weird case-sensitive problems?** It's in the past been possible to
+import Logrus as both upper- and lower-case. Due to the Go package environment,
+this caused issues in the community and we needed a standard. Some environments
+experienced problems with the upper-case variant, so the lower-case was decided.
+Everything using `logrus` will need to use the lower-case:
+`github.com/sirupsen/logrus`. Any package that isn't, should be changed.
+
+To fix Glide, see [these
+comments](https://github.com/sirupsen/logrus/issues/553#issuecomment-306591437).
+For an in-depth explanation of the casing issue, see [this
+comment](https://github.com/sirupsen/logrus/issues/570#issuecomment-313933276).
+
+Nicely color-coded in development (when a TTY is attached, otherwise just
+plain text):
+
+![Colored](http://i.imgur.com/PY7qMwd.png)
+
+With `log.SetFormatter(&log.JSONFormatter{})`, for easy parsing by logstash
+or Splunk:
+
+```json
+{"animal":"walrus","level":"info","msg":"A group of walrus emerges from the
+ocean","size":10,"time":"2014-03-10 19:57:38.562264131 -0400 EDT"}
+
+{"level":"warning","msg":"The group's number increased tremendously!",
+"number":122,"omg":true,"time":"2014-03-10 19:57:38.562471297 -0400 EDT"}
+
+{"animal":"walrus","level":"info","msg":"A giant walrus appears!",
+"size":10,"time":"2014-03-10 19:57:38.562500591 -0400 EDT"}
+
+{"animal":"walrus","level":"info","msg":"Tremendously sized cow enters the ocean.",
+"size":9,"time":"2014-03-10 19:57:38.562527896 -0400 EDT"}
+
+{"level":"fatal","msg":"The ice breaks!","number":100,"omg":true,
+"time":"2014-03-10 19:57:38.562543128 -0400 EDT"}
+```
+
+With the default `log.SetFormatter(&log.TextFormatter{})` when a TTY is not
+attached, the output is compatible with the
+[logfmt](http://godoc.org/github.com/kr/logfmt) format:
+
+```text
+time="2015-03-26T01:27:38-04:00" level=debug msg="Started observing beach" animal=walrus number=8
+time="2015-03-26T01:27:38-04:00" level=info msg="A group of walrus emerges from the ocean" animal=walrus size=10
+time="2015-03-26T01:27:38-04:00" level=warning msg="The group's number increased tremendously!" number=122 omg=true
+time="2015-03-26T01:27:38-04:00" level=debug msg="Temperature changes" temperature=-4
+time="2015-03-26T01:27:38-04:00" level=panic msg="It's over 9000!" animal=orca size=9009
+time="2015-03-26T01:27:38-04:00" level=fatal msg="The ice breaks!" err=&{0x2082280c0 map[animal:orca size:9009] 2015-03-26 01:27:38.441574009 -0400 EDT panic It's over 9000!} number=100 omg=true
+```
+To ensure this behaviour even if a TTY is attached, set your formatter as follows:
+
+```go
+	log.SetFormatter(&log.TextFormatter{
+		DisableColors: true,
+		FullTimestamp: true,
+	})
+```
+
+#### Logging Method Name
+
+If you wish to add the calling method as a field, instruct the logger via:
+```go
+log.SetReportCaller(true)
+```
+This adds the caller as 'method' like so:
+
+```json
+{"animal":"penguin","level":"fatal","method":"github.com/sirupsen/arcticcreatures.migrate","msg":"a penguin swims by",
+"time":"2014-03-10 19:57:38.562543129 -0400 EDT"}
+```
+
+```text
+time="2015-03-26T01:27:38-04:00" level=fatal method=github.com/sirupsen/arcticcreatures.migrate msg="a penguin swims by" animal=penguin
+```
+Note that this does add measurable overhead - the cost will depend on the version of Go, but is
+between 20 and 40% in recent tests with 1.6 and 1.7.  You can validate this in your
+environment via benchmarks: 
+```
+go test -bench=.*CallerTracing
+```
+
+
+#### Case-sensitivity
+
+The organization's name was changed to lower-case--and this will not be changed
+back. If you are getting import conflicts due to case sensitivity, please use
+the lower-case import: `github.com/sirupsen/logrus`.
+
+#### Example
+
+The simplest way to use Logrus is simply the package-level exported logger:
+
+```go
+package main
+
+import (
+  log "github.com/sirupsen/logrus"
+)
+
+func main() {
+  log.WithFields(log.Fields{
+    "animal": "walrus",
+  }).Info("A walrus appears")
+}
+```
+
+Note that it's completely api-compatible with the stdlib logger, so you can
+replace your `log` imports everywhere with `log "github.com/sirupsen/logrus"`
+and you'll now have the flexibility of Logrus. You can customize it all you
+want:
+
+```go
+package main
+
+import (
+  "os"
+  log "github.com/sirupsen/logrus"
+)
+
+func init() {
+  // Log as JSON instead of the default ASCII formatter.
+  log.SetFormatter(&log.JSONFormatter{})
+
+  // Output to stdout instead of the default stderr
+  // Can be any io.Writer, see below for File example
+  log.SetOutput(os.Stdout)
+
+  // Only log the warning severity or above.
+  log.SetLevel(log.WarnLevel)
+}
+
+func main() {
+  log.WithFields(log.Fields{
+    "animal": "walrus",
+    "size":   10,
+  }).Info("A group of walrus emerges from the ocean")
+
+  log.WithFields(log.Fields{
+    "omg":    true,
+    "number": 122,
+  }).Warn("The group's number increased tremendously!")
+
+  log.WithFields(log.Fields{
+    "omg":    true,
+    "number": 100,
+  }).Fatal("The ice breaks!")
+
+  // A common pattern is to re-use fields between logging statements by re-using
+  // the logrus.Entry returned from WithFields()
+  contextLogger := log.WithFields(log.Fields{
+    "common": "this is a common field",
+    "other": "I also should be logged always",
+  })
+
+  contextLogger.Info("I'll be logged with common and other field")
+  contextLogger.Info("Me too")
+}
+```
+
+For more advanced usage such as logging to multiple locations from the same
+application, you can also create an instance of the `logrus` Logger:
+
+```go
+package main
+
+import (
+  "os"
+  "github.com/sirupsen/logrus"
+)
+
+// Create a new instance of the logger. You can have any number of instances.
+var log = logrus.New()
+
+func main() {
+  // The API for setting attributes is a little different than the package level
+  // exported logger. See Godoc.
+  log.Out = os.Stdout
+
+  // You could set this to any `io.Writer` such as a file
+  // file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+  // if err == nil {
+  //  log.Out = file
+  // } else {
+  //  log.Info("Failed to log to file, using default stderr")
+  // }
+
+  log.WithFields(logrus.Fields{
+    "animal": "walrus",
+    "size":   10,
+  }).Info("A group of walrus emerges from the ocean")
+}
+```
+
+#### Fields
+
+Logrus encourages careful, structured logging through logging fields instead of
+long, unparseable error messages. For example, instead of: `log.Fatalf("Failed
+to send event %s to topic %s with key %d")`, you should log the much more
+discoverable:
+
+```go
+log.WithFields(log.Fields{
+  "event": event,
+  "topic": topic,
+  "key": key,
+}).Fatal("Failed to send event")
+```
+
+We've found this API forces you to think about logging in a way that produces
+much more useful logging messages. We've been in countless situations where just
+a single added field to a log statement that was already there would've saved us
+hours. The `WithFields` call is optional.
+
+In general, with Logrus using any of the `printf`-family functions should be
+seen as a hint you should add a field, however, you can still use the
+`printf`-family functions with Logrus.
+
+#### Default Fields
+
+Often it's helpful to have fields _always_ attached to log statements in an
+application or parts of one. For example, you may want to always log the
+`request_id` and `user_ip` in the context of a request. Instead of writing
+`log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip})` on
+every line, you can create a `logrus.Entry` to pass around instead:
+
+```go
+requestLogger := log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip})
+requestLogger.Info("something happened on that request") # will log request_id and user_ip
+requestLogger.Warn("something not great happened")
+```
+
+#### Hooks
+
+You can add hooks for logging levels. For example to send errors to an exception
+tracking service on `Error`, `Fatal` and `Panic`, info to StatsD or log to
+multiple places simultaneously, e.g. syslog.
+
+Logrus comes with [built-in hooks](hooks/). Add those, or your custom hook, in
+`init`:
+
+```go
+import (
+  log "github.com/sirupsen/logrus"
+  "gopkg.in/gemnasium/logrus-airbrake-hook.v2" // the package is named "airbrake"
+  logrus_syslog "github.com/sirupsen/logrus/hooks/syslog"
+  "log/syslog"
+)
+
+func init() {
+
+  // Use the Airbrake hook to report errors that have Error severity or above to
+  // an exception tracker. You can create custom hooks, see the Hooks section.
+  log.AddHook(airbrake.NewHook(123, "xyz", "production"))
+
+  hook, err := logrus_syslog.NewSyslogHook("udp", "localhost:514", syslog.LOG_INFO, "")
+  if err != nil {
+    log.Error("Unable to connect to local syslog daemon")
+  } else {
+    log.AddHook(hook)
+  }
+}
+```
+Note: Syslog hook also support connecting to local syslog (Ex. "/dev/log" or "/var/run/syslog" or "/var/run/log"). For the detail, please check the [syslog hook README](hooks/syslog/README.md).
+
+A list of currently known service hooks can be found in this wiki [page](https://github.com/sirupsen/logrus/wiki/Hooks)
+
+
+#### Level logging
+
+Logrus has seven logging levels: Trace, Debug, Info, Warning, Error, Fatal and Panic.
+
+```go
+log.Trace("Something very low level.")
+log.Debug("Useful debugging information.")
+log.Info("Something noteworthy happened!")
+log.Warn("You should probably take a look at this.")
+log.Error("Something failed but I'm not quitting.")
+// Calls os.Exit(1) after logging
+log.Fatal("Bye.")
+// Calls panic() after logging
+log.Panic("I'm bailing.")
+```
+
+You can set the logging level on a `Logger`, then it will only log entries with
+that severity or anything above it:
+
+```go
+// Will log anything that is info or above (warn, error, fatal, panic). Default.
+log.SetLevel(log.InfoLevel)
+```
+
+It may be useful to set `log.Level = logrus.DebugLevel` in a debug or verbose
+environment if your application has that.
+
+#### Entries
+
+Besides the fields added with `WithField` or `WithFields` some fields are
+automatically added to all logging events:
+
+1. `time`. The timestamp when the entry was created.
+2. `msg`. The logging message passed to `{Info,Warn,Error,Fatal,Panic}` after
+   the `AddFields` call. E.g. `Failed to send event.`
+3. `level`. The logging level. E.g. `info`.
+
+#### Environments
+
+Logrus has no notion of environment.
+
+If you wish for hooks and formatters to only be used in specific environments,
+you should handle that yourself. For example, if your application has a global
+variable `Environment`, which is a string representation of the environment you
+could do:
+
+```go
+import (
+  log "github.com/sirupsen/logrus"
+)
+
+init() {
+  // do something here to set environment depending on an environment variable
+  // or command-line flag
+  if Environment == "production" {
+    log.SetFormatter(&log.JSONFormatter{})
+  } else {
+    // The TextFormatter is default, you don't actually have to do this.
+    log.SetFormatter(&log.TextFormatter{})
+  }
+}
+```
+
+This configuration is how `logrus` was intended to be used, but JSON in
+production is mostly only useful if you do log aggregation with tools like
+Splunk or Logstash.
+
+#### Formatters
+
+The built-in logging formatters are:
+
+* `logrus.TextFormatter`. Logs the event in colors if stdout is a tty, otherwise
+  without colors.
+  * *Note:* to force colored output when there is no TTY, set the `ForceColors`
+    field to `true`.  To force no colored output even if there is a TTY  set the
+    `DisableColors` field to `true`. For Windows, see
+    [github.com/mattn/go-colorable](https://github.com/mattn/go-colorable).
+  * When colors are enabled, levels are truncated to 4 characters by default. To disable
+    truncation set the `DisableLevelTruncation` field to `true`.
+  * When outputting to a TTY, it's often helpful to visually scan down a column where all the levels are the same width. Setting the `PadLevelText` field to `true` enables this behavior, by adding padding to the level text.
+  * All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#TextFormatter).
+* `logrus.JSONFormatter`. Logs fields as JSON.
+  * All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#JSONFormatter).
+
+Third party logging formatters:
+
+* [`FluentdFormatter`](https://github.com/joonix/log). Formats entries that can be parsed by Kubernetes and Google Container Engine.
+* [`GELF`](https://github.com/fabienm/go-logrus-formatters). Formats entries so they comply to Graylog's [GELF 1.1 specification](http://docs.graylog.org/en/2.4/pages/gelf.html).
+* [`logstash`](https://github.com/bshuster-repo/logrus-logstash-hook). Logs fields as [Logstash](http://logstash.net) Events.
+* [`prefixed`](https://github.com/x-cray/logrus-prefixed-formatter). Displays log entry source along with alternative layout.
+* [`zalgo`](https://github.com/aybabtme/logzalgo). Invoking the Power of Zalgo.
+* [`nested-logrus-formatter`](https://github.com/antonfisher/nested-logrus-formatter). Converts logrus fields to a nested structure.
+* [`powerful-logrus-formatter`](https://github.com/zput/zxcTool). get fileName, log's line number and the latest function's name when print log; Sava log to files.
+* [`caption-json-formatter`](https://github.com/nolleh/caption_json_formatter). logrus's message json formatter with human-readable caption added.
+
+You can define your formatter by implementing the `Formatter` interface,
+requiring a `Format` method. `Format` takes an `*Entry`. `entry.Data` is a
+`Fields` type (`map[string]interface{}`) with all your fields as well as the
+default ones (see Entries section above):
+
+```go
+type MyJSONFormatter struct {
+}
+
+log.SetFormatter(new(MyJSONFormatter))
+
+func (f *MyJSONFormatter) Format(entry *Entry) ([]byte, error) {
+  // Note this doesn't include Time, Level and Message which are available on
+  // the Entry. Consult `godoc` on information about those fields or read the
+  // source of the official loggers.
+  serialized, err := json.Marshal(entry.Data)
+    if err != nil {
+      return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
+    }
+  return append(serialized, '\n'), nil
+}
+```
+
+#### Logger as an `io.Writer`
+
+Logrus can be transformed into an `io.Writer`. That writer is the end of an `io.Pipe` and it is your responsibility to close it.
+
+```go
+w := logger.Writer()
+defer w.Close()
+
+srv := http.Server{
+    // create a stdlib log.Logger that writes to
+    // logrus.Logger.
+    ErrorLog: log.New(w, "", 0),
+}
+```
+
+Each line written to that writer will be printed the usual way, using formatters
+and hooks. The level for those entries is `info`.
+
+This means that we can override the standard library logger easily:
+
+```go
+logger := logrus.New()
+logger.Formatter = &logrus.JSONFormatter{}
+
+// Use logrus for standard log output
+// Note that `log` here references stdlib's log
+// Not logrus imported under the name `log`.
+log.SetOutput(logger.Writer())
+```
+
+#### Rotation
+
+Log rotation is not provided with Logrus. Log rotation should be done by an
+external program (like `logrotate(8)`) that can compress and delete old log
+entries. It should not be a feature of the application-level logger.
+
+#### Tools
+
+| Tool | Description |
+| ---- | ----------- |
+|[Logrus Mate](https://github.com/gogap/logrus_mate)|Logrus mate is a tool for Logrus to manage loggers, you can initial logger's level, hook and formatter by config file, the logger will be generated with different configs in different environments.|
+|[Logrus Viper Helper](https://github.com/heirko/go-contrib/tree/master/logrusHelper)|An Helper around Logrus to wrap with spf13/Viper to load configuration with fangs! And to simplify Logrus configuration use some behavior of [Logrus Mate](https://github.com/gogap/logrus_mate). [sample](https://github.com/heirko/iris-contrib/blob/master/middleware/logrus-logger/example) |
+
+#### Testing
+
+Logrus has a built in facility for asserting the presence of log messages. This is implemented through the `test` hook and provides:
+
+* decorators for existing logger (`test.NewLocal` and `test.NewGlobal`) which basically just adds the `test` hook
+* a test logger (`test.NewNullLogger`) that just records log messages (and does not output any):
+
+```go
+import(
+  "github.com/sirupsen/logrus"
+  "github.com/sirupsen/logrus/hooks/test"
+  "github.com/stretchr/testify/assert"
+  "testing"
+)
+
+func TestSomething(t*testing.T){
+  logger, hook := test.NewNullLogger()
+  logger.Error("Helloerror")
+
+  assert.Equal(t, 1, len(hook.Entries))
+  assert.Equal(t, logrus.ErrorLevel, hook.LastEntry().Level)
+  assert.Equal(t, "Helloerror", hook.LastEntry().Message)
+
+  hook.Reset()
+  assert.Nil(t, hook.LastEntry())
+}
+```
+
+#### Fatal handlers
+
+Logrus can register one or more functions that will be called when any `fatal`
+level message is logged. The registered handlers will be executed before
+logrus performs an `os.Exit(1)`. This behavior may be helpful if callers need
+to gracefully shutdown. Unlike a `panic("Something went wrong...")` call which can be intercepted with a deferred `recover` a call to `os.Exit(1)` can not be intercepted.
+
+```
+...
+handler := func() {
+  // gracefully shutdown something...
+}
+logrus.RegisterExitHandler(handler)
+...
+```
+
+#### Thread safety
+
+By default, Logger is protected by a mutex for concurrent writes. The mutex is held when calling hooks and writing logs.
+If you are sure such locking is not needed, you can call logger.SetNoLock() to disable the locking.
+
+Situation when locking is not needed includes:
+
+* You have no hooks registered, or hooks calling is already thread-safe.
+
+* Writing to logger.Out is already thread-safe, for example:
+
+  1) logger.Out is protected by locks.
+
+  2) logger.Out is an os.File handler opened with `O_APPEND` flag, and every write is smaller than 4k. (This allows multi-thread/multi-process writing)
+
+     (Refer to http://www.notthewizard.com/2014/06/17/are-files-appends-really-atomic/)

vendor/github.com/sirupsen/logrus/alt_exit.go

@@ -0,0 +1,76 @@
+package logrus
+
+// The following code was sourced and modified from the
+// https://github.com/tebeka/atexit package governed by the following license:
+//
+// Copyright (c) 2012 Miki Tebeka <miki.tebeka@gmail.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import (
+	"fmt"
+	"os"
+)
+
+var handlers = []func(){}
+
+func runHandler(handler func()) {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Fprintln(os.Stderr, "Error: Logrus exit handler error:", err)
+		}
+	}()
+
+	handler()
+}
+
+func runHandlers() {
+	for _, handler := range handlers {
+		runHandler(handler)
+	}
+}
+
+// Exit runs all the Logrus atexit handlers and then terminates the program using os.Exit(code)
+func Exit(code int) {
+	runHandlers()
+	os.Exit(code)
+}
+
+// RegisterExitHandler appends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func RegisterExitHandler(handler func()) {
+	handlers = append(handlers, handler)
+}
+
+// DeferExitHandler prepends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func DeferExitHandler(handler func()) {
+	handlers = append([]func(){handler}, handlers...)
+}

vendor/github.com/sirupsen/logrus/appveyor.yml

@@ -0,0 +1,14 @@
+version: "{build}"
+platform: x64
+clone_folder: c:\gopath\src\github.com\sirupsen\logrus
+environment:
+  GOPATH: c:\gopath
+branches:
+  only:
+    - master
+install:
+  - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+  - go version
+build_script:
+  - go get -t
+  - go test

vendor/github.com/sirupsen/logrus/buffer_pool.go

@@ -0,0 +1,52 @@
+package logrus
+
+import (
+	"bytes"
+	"sync"
+)
+
+var (
+	bufferPool BufferPool
+)
+
+type BufferPool interface {
+	Put(*bytes.Buffer)
+	Get() *bytes.Buffer
+}
+
+type defaultPool struct {
+	pool *sync.Pool
+}
+
+func (p *defaultPool) Put(buf *bytes.Buffer) {
+	p.pool.Put(buf)
+}
+
+func (p *defaultPool) Get() *bytes.Buffer {
+	return p.pool.Get().(*bytes.Buffer)
+}
+
+func getBuffer() *bytes.Buffer {
+	return bufferPool.Get()
+}
+
+func putBuffer(buf *bytes.Buffer) {
+	buf.Reset()
+	bufferPool.Put(buf)
+}
+
+// SetBufferPool allows to replace the default logrus buffer pool
+// to better meets the specific needs of an application.
+func SetBufferPool(bp BufferPool) {
+	bufferPool = bp
+}
+
+func init() {
+	SetBufferPool(&defaultPool{
+		pool: &sync.Pool{
+			New: func() interface{} {
+				return new(bytes.Buffer)
+			},
+		},
+	})
+}

vendor/github.com/sirupsen/logrus/doc.go

@@ -0,0 +1,26 @@
+/*
+Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
+
+
+The simplest way to use Logrus is simply the package-level exported logger:
+
+  package main
+
+  import (
+    log "github.com/sirupsen/logrus"
+  )
+
+  func main() {
+    log.WithFields(log.Fields{
+      "animal": "walrus",
+      "number": 1,
+      "size":   10,
+    }).Info("A walrus appears")
+  }
+
+Output:
+  time="2015-09-07T08:48:33Z" level=info msg="A walrus appears" animal=walrus number=1 size=10
+
+For a full guide visit https://github.com/sirupsen/logrus
+*/
+package logrus

vendor/github.com/sirupsen/logrus/entry.go

@@ -0,0 +1,422 @@
+package logrus
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os"
+	"reflect"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+)
+
+var (
+
+	// qualified package name, cached at first use
+	logrusPackage string
+
+	// Positions in the call stack when tracing to report the calling method
+	minimumCallerDepth int
+
+	// Used for caller information initialisation
+	callerInitOnce sync.Once
+)
+
+const (
+	maximumCallerDepth int = 25
+	knownLogrusFrames  int = 4
+)
+
+func init() {
+	// start at the bottom of the stack before the package-name cache is primed
+	minimumCallerDepth = 1
+}
+
+// Defines the key when adding errors using WithError.
+var ErrorKey = "error"
+
+// An entry is the final or intermediate Logrus logging entry. It contains all
+// the fields passed with WithField{,s}. It's finally logged when Trace, Debug,
+// Info, Warn, Error, Fatal or Panic is called on it. These objects can be
+// reused and passed around as much as you wish to avoid field duplication.
+type Entry struct {
+	Logger *Logger
+
+	// Contains all the fields set by the user.
+	Data Fields
+
+	// Time at which the log entry was created
+	Time time.Time
+
+	// Level the log entry was logged at: Trace, Debug, Info, Warn, Error, Fatal or Panic
+	// This field will be set on entry firing and the value will be equal to the one in Logger struct field.
+	Level Level
+
+	// Calling method, with package name
+	Caller *runtime.Frame
+
+	// Message passed to Trace, Debug, Info, Warn, Error, Fatal or Panic
+	Message string
+
+	// When formatter is called in entry.log(), a Buffer may be set to entry
+	Buffer *bytes.Buffer
+
+	// Contains the context set by the user. Useful for hook processing etc.
+	Context context.Context
+
+	// err may contain a field formatting error
+	err string
+}
+
+func NewEntry(logger *Logger) *Entry {
+	return &Entry{
+		Logger: logger,
+		// Default is three fields, plus one optional.  Give a little extra room.
+		Data: make(Fields, 6),
+	}
+}
+
+// Returns the bytes representation of this entry from the formatter.
+func (entry *Entry) Bytes() ([]byte, error) {
+	return entry.Logger.Formatter.Format(entry)
+}
+
+// Returns the string representation from the reader and ultimately the
+// formatter.
+func (entry *Entry) String() (string, error) {
+	serialized, err := entry.Bytes()
+	if err != nil {
+		return "", err
+	}
+	str := string(serialized)
+	return str, nil
+}
+
+// Add an error as single field (using the key defined in ErrorKey) to the Entry.
+func (entry *Entry) WithError(err error) *Entry {
+	return entry.WithField(ErrorKey, err)
+}
+
+// Add a context to the Entry.
+func (entry *Entry) WithContext(ctx context.Context) *Entry {
+	dataCopy := make(Fields, len(entry.Data))
+	for k, v := range entry.Data {
+		dataCopy[k] = v
+	}
+	return &Entry{Logger: entry.Logger, Data: dataCopy, Time: entry.Time, err: entry.err, Context: ctx}
+}
+
+// Add a single field to the Entry.
+func (entry *Entry) WithField(key string, value interface{}) *Entry {
+	return entry.WithFields(Fields{key: value})
+}
+
+// Add a map of fields to the Entry.
+func (entry *Entry) WithFields(fields Fields) *Entry {
+	data := make(Fields, len(entry.Data)+len(fields))
+	for k, v := range entry.Data {
+		data[k] = v
+	}
+	fieldErr := entry.err
+	for k, v := range fields {
+		isErrField := false
+		if t := reflect.TypeOf(v); t != nil {
+			switch t.Kind() {
+			case reflect.Func:
+				isErrField = true
+			case reflect.Ptr:
+				isErrField = t.Elem().Kind() == reflect.Func
+			}
+		}
+		if isErrField {
+			tmp := fmt.Sprintf("can not add field %q", k)
+			if fieldErr != "" {
+				fieldErr = entry.err + ", " + tmp
+			} else {
+				fieldErr = tmp
+			}
+		} else {
+			data[k] = v
+		}
+	}
+	return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr, Context: entry.Context}
+}
+
+// Overrides the time of the Entry.
+func (entry *Entry) WithTime(t time.Time) *Entry {
+	dataCopy := make(Fields, len(entry.Data))
+	for k, v := range entry.Data {
+		dataCopy[k] = v
+	}
+	return &Entry{Logger: entry.Logger, Data: dataCopy, Time: t, err: entry.err, Context: entry.Context}
+}
+
+// getPackageName reduces a fully qualified function name to the package name
+// There really ought to be to be a better way...
+func getPackageName(f string) string {
+	for {
+		lastPeriod := strings.LastIndex(f, ".")
+		lastSlash := strings.LastIndex(f, "/")
+		if lastPeriod > lastSlash {
+			f = f[:lastPeriod]
+		} else {
+			break
+		}
+	}
+
+	return f
+}
+
+// getCaller retrieves the name of the first non-logrus calling function
+func getCaller() *runtime.Frame {
+	// cache this package's fully-qualified name
+	callerInitOnce.Do(func() {
+		pcs := make([]uintptr, maximumCallerDepth)
+		_ = runtime.Callers(0, pcs)
+
+		// dynamic get the package name and the minimum caller depth
+		for i := 0; i < maximumCallerDepth; i++ {
+			funcName := runtime.FuncForPC(pcs[i]).Name()
+			if strings.Contains(funcName, "getCaller") {
+				logrusPackage = getPackageName(funcName)
+				break
+			}
+		}
+
+		minimumCallerDepth = knownLogrusFrames
+	})
+
+	// Restrict the lookback frames to avoid runaway lookups
+	pcs := make([]uintptr, maximumCallerDepth)
+	depth := runtime.Callers(minimumCallerDepth, pcs)
+	frames := runtime.CallersFrames(pcs[:depth])
+
+	for f, again := frames.Next(); again; f, again = frames.Next() {
+		pkg := getPackageName(f.Function)
+
+		// If the caller isn't part of this package, we're done
+		if pkg != logrusPackage {
+			return &f //nolint:scopelint
+		}
+	}
+
+	// if we got here, we failed to find the caller's context
+	return nil
+}
+
+func (entry Entry) HasCaller() (has bool) {
+	return entry.Logger != nil &&
+		entry.Logger.ReportCaller &&
+		entry.Caller != nil
+}
+
+// This function is not declared with a pointer value because otherwise
+// race conditions will occur when using multiple goroutines
+func (entry Entry) log(level Level, msg string) {
+	var buffer *bytes.Buffer
+
+	// Default to now, but allow users to override if they want.
+	//
+	// We don't have to worry about polluting future calls to Entry#log()
+	// with this assignment because this function is declared with a
+	// non-pointer receiver.
+	if entry.Time.IsZero() {
+		entry.Time = time.Now()
+	}
+
+	entry.Level = level
+	entry.Message = msg
+	entry.Logger.mu.Lock()
+	if entry.Logger.ReportCaller {
+		entry.Caller = getCaller()
+	}
+	entry.Logger.mu.Unlock()
+
+	entry.fireHooks()
+
+	buffer = getBuffer()
+	defer func() {
+		entry.Buffer = nil
+		putBuffer(buffer)
+	}()
+	buffer.Reset()
+	entry.Buffer = buffer
+
+	entry.write()
+
+	entry.Buffer = nil
+
+	// To avoid Entry#log() returning a value that only would make sense for
+	// panic() to use in Entry#Panic(), we avoid the allocation by checking
+	// directly here.
+	if level <= PanicLevel {
+		panic(&entry)
+	}
+}
+
+func (entry *Entry) fireHooks() {
+	entry.Logger.mu.Lock()
+	defer entry.Logger.mu.Unlock()
+	err := entry.Logger.Hooks.Fire(entry.Level, entry)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to fire hook: %v\n", err)
+	}
+}
+
+func (entry *Entry) write() {
+	entry.Logger.mu.Lock()
+	defer entry.Logger.mu.Unlock()
+	serialized, err := entry.Logger.Formatter.Format(entry)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to obtain reader, %v\n", err)
+		return
+	}
+	if _, err = entry.Logger.Out.Write(serialized); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to write to log, %v\n", err)
+	}
+}
+
+func (entry *Entry) Log(level Level, args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(level) {
+		entry.log(level, fmt.Sprint(args...))
+	}
+}
+
+func (entry *Entry) Trace(args ...interface{}) {
+	entry.Log(TraceLevel, args...)
+}
+
+func (entry *Entry) Debug(args ...interface{}) {
+	entry.Log(DebugLevel, args...)
+}
+
+func (entry *Entry) Print(args ...interface{}) {
+	entry.Info(args...)
+}
+
+func (entry *Entry) Info(args ...interface{}) {
+	entry.Log(InfoLevel, args...)
+}
+
+func (entry *Entry) Warn(args ...interface{}) {
+	entry.Log(WarnLevel, args...)
+}
+
+func (entry *Entry) Warning(args ...interface{}) {
+	entry.Warn(args...)
+}
+
+func (entry *Entry) Error(args ...interface{}) {
+	entry.Log(ErrorLevel, args...)
+}
+
+func (entry *Entry) Fatal(args ...interface{}) {
+	entry.Log(FatalLevel, args...)
+	entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panic(args ...interface{}) {
+	entry.Log(PanicLevel, args...)
+	panic(fmt.Sprint(args...))
+}
+
+// Entry Printf family functions
+
+func (entry *Entry) Logf(level Level, format string, args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(level) {
+		entry.Log(level, fmt.Sprintf(format, args...))
+	}
+}
+
+func (entry *Entry) Tracef(format string, args ...interface{}) {
+	entry.Logf(TraceLevel, format, args...)
+}
+
+func (entry *Entry) Debugf(format string, args ...interface{}) {
+	entry.Logf(DebugLevel, format, args...)
+}
+
+func (entry *Entry) Infof(format string, args ...interface{}) {
+	entry.Logf(InfoLevel, format, args...)
+}
+
+func (entry *Entry) Printf(format string, args ...interface{}) {
+	entry.Infof(format, args...)
+}
+
+func (entry *Entry) Warnf(format string, args ...interface{}) {
+	entry.Logf(WarnLevel, format, args...)
+}
+
+func (entry *Entry) Warningf(format string, args ...interface{}) {
+	entry.Warnf(format, args...)
+}
+
+func (entry *Entry) Errorf(format string, args ...interface{}) {
+	entry.Logf(ErrorLevel, format, args...)
+}
+
+func (entry *Entry) Fatalf(format string, args ...interface{}) {
+	entry.Logf(FatalLevel, format, args...)
+	entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panicf(format string, args ...interface{}) {
+	entry.Logf(PanicLevel, format, args...)
+}
+
+// Entry Println family functions
+
+func (entry *Entry) Logln(level Level, args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(level) {
+		entry.Log(level, entry.sprintlnn(args...))
+	}
+}
+
+func (entry *Entry) Traceln(args ...interface{}) {
+	entry.Logln(TraceLevel, args...)
+}
+
+func (entry *Entry) Debugln(args ...interface{}) {
+	entry.Logln(DebugLevel, args...)
+}
+
+func (entry *Entry) Infoln(args ...interface{}) {
+	entry.Logln(InfoLevel, args...)
+}
+
+func (entry *Entry) Println(args ...interface{}) {
+	entry.Infoln(args...)
+}
+
+func (entry *Entry) Warnln(args ...interface{}) {
+	entry.Logln(WarnLevel, args...)
+}
+
+func (entry *Entry) Warningln(args ...interface{}) {
+	entry.Warnln(args...)
+}
+
+func (entry *Entry) Errorln(args ...interface{}) {
+	entry.Logln(ErrorLevel, args...)
+}
+
+func (entry *Entry) Fatalln(args ...interface{}) {
+	entry.Logln(FatalLevel, args...)
+	entry.Logger.Exit(1)
+}
+
+func (entry *Entry) Panicln(args ...interface{}) {
+	entry.Logln(PanicLevel, args...)
+}
+
+// Sprintlnn => Sprint no newline. This is to get the behavior of how
+// fmt.Sprintln where spaces are always added between operands, regardless of
+// their type. Instead of vendoring the Sprintln implementation to spare a
+// string allocation, we do the simplest thing.
+func (entry *Entry) sprintlnn(args ...interface{}) string {
+	msg := fmt.Sprintln(args...)
+	return msg[:len(msg)-1]
+}

vendor/github.com/sirupsen/logrus/exported.go

@@ -0,0 +1,270 @@
+package logrus
+
+import (
+	"context"
+	"io"
+	"time"
+)
+
+var (
+	// std is the name of the standard logger in stdlib `log`
+	std = New()
+)
+
+func StandardLogger() *Logger {
+	return std
+}
+
+// SetOutput sets the standard logger output.
+func SetOutput(out io.Writer) {
+	std.SetOutput(out)
+}
+
+// SetFormatter sets the standard logger formatter.
+func SetFormatter(formatter Formatter) {
+	std.SetFormatter(formatter)
+}
+
+// SetReportCaller sets whether the standard logger will include the calling
+// method as a field.
+func SetReportCaller(include bool) {
+	std.SetReportCaller(include)
+}
+
+// SetLevel sets the standard logger level.
+func SetLevel(level Level) {
+	std.SetLevel(level)
+}
+
+// GetLevel returns the standard logger level.
+func GetLevel() Level {
+	return std.GetLevel()
+}
+
+// IsLevelEnabled checks if the log level of the standard logger is greater than the level param
+func IsLevelEnabled(level Level) bool {
+	return std.IsLevelEnabled(level)
+}
+
+// AddHook adds a hook to the standard logger hooks.
+func AddHook(hook Hook) {
+	std.AddHook(hook)
+}
+
+// WithError creates an entry from the standard logger and adds an error to it, using the value defined in ErrorKey as key.
+func WithError(err error) *Entry {
+	return std.WithField(ErrorKey, err)
+}
+
+// WithContext creates an entry from the standard logger and adds a context to it.
+func WithContext(ctx context.Context) *Entry {
+	return std.WithContext(ctx)
+}
+
+// WithField creates an entry from the standard logger and adds a field to
+// it. If you want multiple fields, use `WithFields`.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithField(key string, value interface{}) *Entry {
+	return std.WithField(key, value)
+}
+
+// WithFields creates an entry from the standard logger and adds multiple
+// fields to it. This is simply a helper for `WithField`, invoking it
+// once for each field.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithFields(fields Fields) *Entry {
+	return std.WithFields(fields)
+}
+
+// WithTime creates an entry from the standard logger and overrides the time of
+// logs generated with it.
+//
+// Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal
+// or Panic on the Entry it returns.
+func WithTime(t time.Time) *Entry {
+	return std.WithTime(t)
+}
+
+// Trace logs a message at level Trace on the standard logger.
+func Trace(args ...interface{}) {
+	std.Trace(args...)
+}
+
+// Debug logs a message at level Debug on the standard logger.
+func Debug(args ...interface{}) {
+	std.Debug(args...)
+}
+
+// Print logs a message at level Info on the standard logger.
+func Print(args ...interface{}) {
+	std.Print(args...)
+}
+
+// Info logs a message at level Info on the standard logger.
+func Info(args ...interface{}) {
+	std.Info(args...)
+}
+
+// Warn logs a message at level Warn on the standard logger.
+func Warn(args ...interface{}) {
+	std.Warn(args...)
+}
+
+// Warning logs a message at level Warn on the standard logger.
+func Warning(args ...interface{}) {
+	std.Warning(args...)
+}
+
+// Error logs a message at level Error on the standard logger.
+func Error(args ...interface{}) {
+	std.Error(args...)
+}
+
+// Panic logs a message at level Panic on the standard logger.
+func Panic(args ...interface{}) {
+	std.Panic(args...)
+}
+
+// Fatal logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatal(args ...interface{}) {
+	std.Fatal(args...)
+}
+
+// TraceFn logs a message from a func at level Trace on the standard logger.
+func TraceFn(fn LogFunction) {
+	std.TraceFn(fn)
+}
+
+// DebugFn logs a message from a func at level Debug on the standard logger.
+func DebugFn(fn LogFunction) {
+	std.DebugFn(fn)
+}
+
+// PrintFn logs a message from a func at level Info on the standard logger.
+func PrintFn(fn LogFunction) {
+	std.PrintFn(fn)
+}
+
+// InfoFn logs a message from a func at level Info on the standard logger.
+func InfoFn(fn LogFunction) {
+	std.InfoFn(fn)
+}
+
+// WarnFn logs a message from a func at level Warn on the standard logger.
+func WarnFn(fn LogFunction) {
+	std.WarnFn(fn)
+}
+
+// WarningFn logs a message from a func at level Warn on the standard logger.
+func WarningFn(fn LogFunction) {
+	std.WarningFn(fn)
+}
+
+// ErrorFn logs a message from a func at level Error on the standard logger.
+func ErrorFn(fn LogFunction) {
+	std.ErrorFn(fn)
+}
+
+// PanicFn logs a message from a func at level Panic on the standard logger.
+func PanicFn(fn LogFunction) {
+	std.PanicFn(fn)
+}
+
+// FatalFn logs a message from a func at level Fatal on the standard logger then the process will exit with status set to 1.
+func FatalFn(fn LogFunction) {
+	std.FatalFn(fn)
+}
+
+// Tracef logs a message at level Trace on the standard logger.
+func Tracef(format string, args ...interface{}) {
+	std.Tracef(format, args...)
+}
+
+// Debugf logs a message at level Debug on the standard logger.
+func Debugf(format string, args ...interface{}) {
+	std.Debugf(format, args...)
+}
+
+// Printf logs a message at level Info on the standard logger.
+func Printf(format string, args ...interface{}) {
+	std.Printf(format, args...)
+}
+
+// Infof logs a message at level Info on the standard logger.
+func Infof(format string, args ...interface{}) {
+	std.Infof(format, args...)
+}
+
+// Warnf logs a message at level Warn on the standard logger.
+func Warnf(format string, args ...interface{}) {
+	std.Warnf(format, args...)
+}
+
+// Warningf logs a message at level Warn on the standard logger.
+func Warningf(format string, args ...interface{}) {
+	std.Warningf(format, args...)
+}
+
+// Errorf logs a message at level Error on the standard logger.
+func Errorf(format string, args ...interface{}) {
+	std.Errorf(format, args...)
+}
+
+// Panicf logs a message at level Panic on the standard logger.
+func Panicf(format string, args ...interface{}) {
+	std.Panicf(format, args...)
+}
+
+// Fatalf logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatalf(format string, args ...interface{}) {
+	std.Fatalf(format, args...)
+}
+
+// Traceln logs a message at level Trace on the standard logger.
+func Traceln(args ...interface{}) {
+	std.Traceln(args...)
+}
+
+// Debugln logs a message at level Debug on the standard logger.
+func Debugln(args ...interface{}) {
+	std.Debugln(args...)
+}
+
+// Println logs a message at level Info on the standard logger.
+func Println(args ...interface{}) {
+	std.Println(args...)
+}
+
+// Infoln logs a message at level Info on the standard logger.
+func Infoln(args ...interface{}) {
+	std.Infoln(args...)
+}
+
+// Warnln logs a message at level Warn on the standard logger.
+func Warnln(args ...interface{}) {
+	std.Warnln(args...)
+}
+
+// Warningln logs a message at level Warn on the standard logger.
+func Warningln(args ...interface{}) {
+	std.Warningln(args...)
+}
+
+// Errorln logs a message at level Error on the standard logger.
+func Errorln(args ...interface{}) {
+	std.Errorln(args...)
+}
+
+// Panicln logs a message at level Panic on the standard logger.
+func Panicln(args ...interface{}) {
+	std.Panicln(args...)
+}
+
+// Fatalln logs a message at level Fatal on the standard logger then the process will exit with status set to 1.
+func Fatalln(args ...interface{}) {
+	std.Fatalln(args...)
+}

vendor/github.com/sirupsen/logrus/formatter.go

@@ -0,0 +1,78 @@
+package logrus
+
+import "time"
+
+// Default key names for the default fields
+const (
+	defaultTimestampFormat = time.RFC3339
+	FieldKeyMsg            = "msg"
+	FieldKeyLevel          = "level"
+	FieldKeyTime           = "time"
+	FieldKeyLogrusError    = "logrus_error"
+	FieldKeyFunc           = "func"
+	FieldKeyFile           = "file"
+)
+
+// The Formatter interface is used to implement a custom Formatter. It takes an
+// `Entry`. It exposes all the fields, including the default ones:
+//
+// * `entry.Data["msg"]`. The message passed from Info, Warn, Error ..
+// * `entry.Data["time"]`. The timestamp.
+// * `entry.Data["level"]. The level the entry was logged at.
+//
+// Any additional fields added with `WithField` or `WithFields` are also in
+// `entry.Data`. Format is expected to return an array of bytes which are then
+// logged to `logger.Out`.
+type Formatter interface {
+	Format(*Entry) ([]byte, error)
+}
+
+// This is to not silently overwrite `time`, `msg`, `func` and `level` fields when
+// dumping it. If this code wasn't there doing:
+//
+//  logrus.WithField("level", 1).Info("hello")
+//
+// Would just silently drop the user provided level. Instead with this code
+// it'll logged as:
+//
+//  {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."}
+//
+// It's not exported because it's still using Data in an opinionated way. It's to
+// avoid code duplication between the two default formatters.
+func prefixFieldClashes(data Fields, fieldMap FieldMap, reportCaller bool) {
+	timeKey := fieldMap.resolve(FieldKeyTime)
+	if t, ok := data[timeKey]; ok {
+		data["fields."+timeKey] = t
+		delete(data, timeKey)
+	}
+
+	msgKey := fieldMap.resolve(FieldKeyMsg)
+	if m, ok := data[msgKey]; ok {
+		data["fields."+msgKey] = m
+		delete(data, msgKey)
+	}
+
+	levelKey := fieldMap.resolve(FieldKeyLevel)
+	if l, ok := data[levelKey]; ok {
+		data["fields."+levelKey] = l
+		delete(data, levelKey)
+	}
+
+	logrusErrKey := fieldMap.resolve(FieldKeyLogrusError)
+	if l, ok := data[logrusErrKey]; ok {
+		data["fields."+logrusErrKey] = l
+		delete(data, logrusErrKey)
+	}
+
+	// If reportCaller is not set, 'func' will not conflict.
+	if reportCaller {
+		funcKey := fieldMap.resolve(FieldKeyFunc)
+		if l, ok := data[funcKey]; ok {
+			data["fields."+funcKey] = l
+		}
+		fileKey := fieldMap.resolve(FieldKeyFile)
+		if l, ok := data[fileKey]; ok {
+			data["fields."+fileKey] = l
+		}
+	}
+}

vendor/github.com/sirupsen/logrus/go.mod

@@ -0,0 +1,10 @@
+module github.com/sirupsen/logrus
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/sys v0.0.0-20191026070338-33540a1f6037
+)
+
+go 1.13

vendor/github.com/sirupsen/logrus/go.sum

@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

vendor/github.com/sirupsen/logrus/hooks.go

@@ -0,0 +1,34 @@
+package logrus
+
+// A hook to be fired when logging on the logging levels returned from
+// `Levels()` on your implementation of the interface. Note that this is not
+// fired in a goroutine or a channel with workers, you should handle such
+// functionality yourself if your call is non-blocking and you don't wish for
+// the logging calls for levels returned from `Levels()` to block.
+type Hook interface {
+	Levels() []Level
+	Fire(*Entry) error
+}
+
+// Internal type for storing the hooks on a logger instance.
+type LevelHooks map[Level][]Hook
+
+// Add a hook to an instance of logger. This is called with
+// `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.
+func (hooks LevelHooks) Add(hook Hook) {
+	for _, level := range hook.Levels() {
+		hooks[level] = append(hooks[level], hook)
+	}
+}
+
+// Fire all the hooks for the passed level. Used by `entry.log` to fire
+// appropriate hooks for a log entry.
+func (hooks LevelHooks) Fire(level Level, entry *Entry) error {
+	for _, hook := range hooks[level] {
+		if err := hook.Fire(entry); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

vendor/github.com/sirupsen/logrus/json_formatter.go

@@ -0,0 +1,125 @@
+package logrus
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"runtime"
+)
+
+type fieldKey string
+
+// FieldMap allows customization of the key names for default fields.
+type FieldMap map[fieldKey]string
+
+func (f FieldMap) resolve(key fieldKey) string {
+	if k, ok := f[key]; ok {
+		return k
+	}
+
+	return string(key)
+}
+
+// JSONFormatter formats logs into parsable json
+type JSONFormatter struct {
+	// TimestampFormat sets the format used for marshaling timestamps.
+	TimestampFormat string
+
+	// DisableTimestamp allows disabling automatic timestamps in output
+	DisableTimestamp bool
+
+	// DisableHTMLEscape allows disabling html escaping in output
+	DisableHTMLEscape bool
+
+	// DataKey allows users to put all the log entry parameters into a nested dictionary at a given key.
+	DataKey string
+
+	// FieldMap allows users to customize the names of keys for default fields.
+	// As an example:
+	// formatter := &JSONFormatter{
+	//   	FieldMap: FieldMap{
+	// 		 FieldKeyTime:  "@timestamp",
+	// 		 FieldKeyLevel: "@level",
+	// 		 FieldKeyMsg:   "@message",
+	// 		 FieldKeyFunc:  "@caller",
+	//    },
+	// }
+	FieldMap FieldMap
+
+	// CallerPrettyfier can be set by the user to modify the content
+	// of the function and file keys in the json data when ReportCaller is
+	// activated. If any of the returned value is the empty string the
+	// corresponding key will be removed from json fields.
+	CallerPrettyfier func(*runtime.Frame) (function string, file string)
+
+	// PrettyPrint will indent all json logs
+	PrettyPrint bool
+}
+
+// Format renders a single log entry
+func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
+	data := make(Fields, len(entry.Data)+4)
+	for k, v := range entry.Data {
+		switch v := v.(type) {
+		case error:
+			// Otherwise errors are ignored by `encoding/json`
+			// https://github.com/sirupsen/logrus/issues/137
+			data[k] = v.Error()
+		default:
+			data[k] = v
+		}
+	}
+
+	if f.DataKey != "" {
+		newData := make(Fields, 4)
+		newData[f.DataKey] = data
+		data = newData
+	}
+
+	prefixFieldClashes(data, f.FieldMap, entry.HasCaller())
+
+	timestampFormat := f.TimestampFormat
+	if timestampFormat == "" {
+		timestampFormat = defaultTimestampFormat
+	}
+
+	if entry.err != "" {
+		data[f.FieldMap.resolve(FieldKeyLogrusError)] = entry.err
+	}
+	if !f.DisableTimestamp {
+		data[f.FieldMap.resolve(FieldKeyTime)] = entry.Time.Format(timestampFormat)
+	}
+	data[f.FieldMap.resolve(FieldKeyMsg)] = entry.Message
+	data[f.FieldMap.resolve(FieldKeyLevel)] = entry.Level.String()
+	if entry.HasCaller() {
+		funcVal := entry.Caller.Function
+		fileVal := fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+		if f.CallerPrettyfier != nil {
+			funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+		}
+		if funcVal != "" {
+			data[f.FieldMap.resolve(FieldKeyFunc)] = funcVal
+		}
+		if fileVal != "" {
+			data[f.FieldMap.resolve(FieldKeyFile)] = fileVal
+		}
+	}
+
+	var b *bytes.Buffer
+	if entry.Buffer != nil {
+		b = entry.Buffer
+	} else {
+		b = &bytes.Buffer{}
+	}
+
+	encoder := json.NewEncoder(b)
+	encoder.SetEscapeHTML(!f.DisableHTMLEscape)
+	if f.PrettyPrint {
+		encoder.SetIndent("", "  ")
+	}
+	if err := encoder.Encode(data); err != nil {
+		return nil, fmt.Errorf("failed to marshal fields to JSON, %v", err)
+	}
+
+	return b.Bytes(), nil
+}