Switch to github.com/golang/dep for vendoring

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

oci/oci.go

@@ -20,7 +20,7 @@ import (
 	"github.com/containernetworking/cni/pkg/ns"
 	"github.com/kubernetes-incubator/cri-o/utils"
 	"golang.org/x/sys/unix"
-	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/apimachinery/pkg/fields"
 	pb "k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
 )
 

server/sandbox.go

@@ -13,7 +13,7 @@ import (
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/kubernetes-incubator/cri-o/oci"
 	"golang.org/x/sys/unix"
-	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/apimachinery/pkg/fields"
 	pb "k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
 )
 

test/bin2img/bin2img.go

@@ -102,7 +102,9 @@ func main() {
 			logrus.Errorf("error opening storage: %v", err)
 			os.Exit(1)
 		}
-		defer store.Shutdown(false)
+		defer func() {
+			_, _ = store.Shutdown(false)
+		}()
 
 		layerBuffer := &bytes.Buffer{}
 		binary, err := os.Open(sourceBinary)
@@ -188,16 +190,15 @@ func main() {
 		manifest := &v1.Manifest{
 			Versioned: specs.Versioned{
 				SchemaVersion: 2,
-				MediaType:     v1.MediaTypeImageManifest,
 			},
 			Config: v1.Descriptor{
 				MediaType: v1.MediaTypeImageConfig,
-				Digest:    configInfo.Digest.String(),
+				Digest:    configInfo.Digest,
 				Size:      int64(len(cbytes)),
 			},
 			Layers: []v1.Descriptor{{
 				MediaType: v1.MediaTypeImageLayer,
-				Digest:    layer.Digest.String(),
+				Digest:    layer.Digest,
 				Size:      layer.Size,
 			}},
 		}

vendor/github.com/BurntSushi/toml/_examples/example.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/BurntSushi/toml"
+)
+
+type tomlConfig struct {
+	Title   string
+	Owner   ownerInfo
+	DB      database `toml:"database"`
+	Servers map[string]server
+	Clients clients
+}
+
+type ownerInfo struct {
+	Name string
+	Org  string `toml:"organization"`
+	Bio  string
+	DOB  time.Time
+}
+
+type database struct {
+	Server  string
+	Ports   []int
+	ConnMax int `toml:"connection_max"`
+	Enabled bool
+}
+
+type server struct {
+	IP string
+	DC string
+}
+
+type clients struct {
+	Data  [][]interface{}
+	Hosts []string
+}
+
+func main() {
+	var config tomlConfig
+	if _, err := toml.DecodeFile("example.toml", &config); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("Title: %s\n", config.Title)
+	fmt.Printf("Owner: %s (%s, %s), Born: %s\n",
+		config.Owner.Name, config.Owner.Org, config.Owner.Bio,
+		config.Owner.DOB)
+	fmt.Printf("Database: %s %v (Max conn. %d), Enabled? %v\n",
+		config.DB.Server, config.DB.Ports, config.DB.ConnMax,
+		config.DB.Enabled)
+	for serverName, server := range config.Servers {
+		fmt.Printf("Server: %s (%s, %s)\n", serverName, server.IP, server.DC)
+	}
+	fmt.Printf("Client data: %v\n", config.Clients.Data)
+	fmt.Printf("Client hosts: %v\n", config.Clients.Hosts)
+}

vendor/github.com/BurntSushi/toml/_examples/example.toml

@@ -0,0 +1,35 @@
+# This is a TOML document. Boom.
+
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+organization = "GitHub"
+bio = "GitHub Cofounder & CEO\nLikes tater tots and beer."
+dob = 1979-05-27T07:32:00Z # First class dates? Why not?
+
+[database]
+server = "192.168.1.1"
+ports = [ 8001, 8001, 8002 ]
+connection_max = 5000
+enabled = true
+
+[servers]
+
+  # You can indent as you please. Tabs or spaces. TOML don't care.
+  [servers.alpha]
+  ip = "10.0.0.1"
+  dc = "eqdc10"
+
+  [servers.beta]
+  ip = "10.0.0.2"
+  dc = "eqdc10"
+
+[clients]
+data = [ ["gamma", "delta"], [1, 2] ] # just an update to make sure parsers support it
+
+# Line breaks are OK when inside arrays
+hosts = [
+  "alpha",
+  "omega"
+]

vendor/github.com/BurntSushi/toml/_examples/hard.toml

@@ -0,0 +1,22 @@
+# Test file for TOML
+# Only this one tries to emulate a TOML file written by a user of the kind of parser writers probably hate
+# This part you'll really hate
+
+[the]
+test_string = "You'll hate me after this - #"          # " Annoying, isn't it?
+
+    [the.hard]
+    test_array = [ "] ", " # "]      # ] There you go, parse this!
+    test_array2 = [ "Test #11 ]proved that", "Experiment #9 was a success" ]
+    # You didn't think it'd as easy as chucking out the last #, did you?
+    another_test_string = " Same thing, but with a string #"
+    harder_test_string = " And when \"'s are in the string, along with # \""   # "and comments are there too"
+    # Things will get harder
+    
+        [the.hard.bit#]
+        what? = "You don't think some user won't do that?"
+        multi_line_array = [
+            "]",
+            # ] Oh yes I did
+            ]
+

vendor/github.com/BurntSushi/toml/_examples/implicit.toml

@@ -0,0 +1,4 @@
+# [x] you
+# [x.y] don't
+# [x.y.z] need these
+[x.y.z.w] # for this to work

vendor/github.com/BurntSushi/toml/_examples/invalid-apples.toml

@@ -0,0 +1,6 @@
+# DO NOT WANT
+[fruit]
+type = "apple"
+
+[fruit.type]
+apple = "yes"

vendor/github.com/BurntSushi/toml/_examples/invalid.toml

@@ -0,0 +1,35 @@
+# This is an INVALID TOML document. Boom.
+# Can you spot the error without help?
+
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+organization = "GitHub"
+bio = "GitHub Cofounder & CEO\nLikes tater tots and beer."
+dob = 1979-05-27T7:32:00Z # First class dates? Why not?
+
+[database]
+server = "192.168.1.1"
+ports = [ 8001, 8001, 8002 ]
+connection_max = 5000
+enabled = true
+
+[servers]
+  # You can indent as you please. Tabs or spaces. TOML don't care.
+  [servers.alpha]
+  ip = "10.0.0.1"
+  dc = "eqdc10"
+
+  [servers.beta]
+  ip = "10.0.0.2"
+  dc = "eqdc10"
+
+[clients]
+data = [ ["gamma", "delta"], [1, 2] ] # just an update to make sure parsers support it
+
+# Line breaks are OK when inside arrays
+hosts = [
+  "alpha",
+  "omega"
+]

vendor/github.com/BurntSushi/toml/_examples/readme1.toml

@@ -0,0 +1,5 @@
+Age = 25
+Cats = [ "Cauchy", "Plato" ]
+Pi = 3.14
+Perfection = [ 6, 28, 496, 8128 ]
+DOB = 1987-07-05T05:45:00Z

vendor/github.com/BurntSushi/toml/_examples/readme2.toml

@@ -0,0 +1 @@
+some_key_NAME = "wat"

vendor/github.com/BurntSushi/toml/cmd/toml-test-decoder/README.md

@@ -0,0 +1,14 @@
+# Implements the TOML test suite interface
+
+This is an implementation of the interface expected by
+[toml-test](https://github.com/BurntSushi/toml-test) for my
+[toml parser written in Go](https://github.com/BurntSushi/toml).
+In particular, it maps TOML data on `stdin` to a JSON format on `stdout`.
+
+
+Compatible with TOML version
+[v0.2.0](https://github.com/mojombo/toml/blob/master/versions/toml-v0.2.0.md)
+
+Compatible with `toml-test` version
+[v0.2.0](https://github.com/BurntSushi/toml-test/tree/v0.2.0)
+

vendor/github.com/BurntSushi/toml/cmd/toml-test-decoder/main.go

@@ -0,0 +1,90 @@
+// Command toml-test-decoder satisfies the toml-test interface for testing
+// TOML decoders. Namely, it accepts TOML on stdin and outputs JSON on stdout.
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"time"
+
+	"github.com/BurntSushi/toml"
+)
+
+func init() {
+	log.SetFlags(0)
+
+	flag.Usage = usage
+	flag.Parse()
+}
+
+func usage() {
+	log.Printf("Usage: %s < toml-file\n", path.Base(os.Args[0]))
+	flag.PrintDefaults()
+
+	os.Exit(1)
+}
+
+func main() {
+	if flag.NArg() != 0 {
+		flag.Usage()
+	}
+
+	var tmp interface{}
+	if _, err := toml.DecodeReader(os.Stdin, &tmp); err != nil {
+		log.Fatalf("Error decoding TOML: %s", err)
+	}
+
+	typedTmp := translate(tmp)
+	if err := json.NewEncoder(os.Stdout).Encode(typedTmp); err != nil {
+		log.Fatalf("Error encoding JSON: %s", err)
+	}
+}
+
+func translate(tomlData interface{}) interface{} {
+	switch orig := tomlData.(type) {
+	case map[string]interface{}:
+		typed := make(map[string]interface{}, len(orig))
+		for k, v := range orig {
+			typed[k] = translate(v)
+		}
+		return typed
+	case []map[string]interface{}:
+		typed := make([]map[string]interface{}, len(orig))
+		for i, v := range orig {
+			typed[i] = translate(v).(map[string]interface{})
+		}
+		return typed
+	case []interface{}:
+		typed := make([]interface{}, len(orig))
+		for i, v := range orig {
+			typed[i] = translate(v)
+		}
+
+		// We don't really need to tag arrays, but let's be future proof.
+		// (If TOML ever supports tuples, we'll need this.)
+		return tag("array", typed)
+	case time.Time:
+		return tag("datetime", orig.Format("2006-01-02T15:04:05Z"))
+	case bool:
+		return tag("bool", fmt.Sprintf("%v", orig))
+	case int64:
+		return tag("integer", fmt.Sprintf("%d", orig))
+	case float64:
+		return tag("float", fmt.Sprintf("%v", orig))
+	case string:
+		return tag("string", orig)
+	}
+
+	panic(fmt.Sprintf("Unknown type: %T", tomlData))
+}
+
+func tag(typeName string, data interface{}) map[string]interface{} {
+	return map[string]interface{}{
+		"type":  typeName,
+		"value": data,
+	}
+}

vendor/github.com/BurntSushi/toml/cmd/toml-test-encoder/README.md

@@ -0,0 +1,14 @@
+# Implements the TOML test suite interface for TOML encoders
+
+This is an implementation of the interface expected by
+[toml-test](https://github.com/BurntSushi/toml-test) for the
+[TOML encoder](https://github.com/BurntSushi/toml).
+In particular, it maps JSON data on `stdin` to a TOML format on `stdout`.
+
+
+Compatible with TOML version
+[v0.2.0](https://github.com/mojombo/toml/blob/master/versions/toml-v0.2.0.md)
+
+Compatible with `toml-test` version
+[v0.2.0](https://github.com/BurntSushi/toml-test/tree/v0.2.0)
+

vendor/github.com/BurntSushi/toml/cmd/toml-test-encoder/main.go

@@ -0,0 +1,131 @@
+// Command toml-test-encoder satisfies the toml-test interface for testing
+// TOML encoders. Namely, it accepts JSON on stdin and outputs TOML on stdout.
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"log"
+	"os"
+	"path"
+	"strconv"
+	"time"
+
+	"github.com/BurntSushi/toml"
+)
+
+func init() {
+	log.SetFlags(0)
+
+	flag.Usage = usage
+	flag.Parse()
+}
+
+func usage() {
+	log.Printf("Usage: %s < json-file\n", path.Base(os.Args[0]))
+	flag.PrintDefaults()
+
+	os.Exit(1)
+}
+
+func main() {
+	if flag.NArg() != 0 {
+		flag.Usage()
+	}
+
+	var tmp interface{}
+	if err := json.NewDecoder(os.Stdin).Decode(&tmp); err != nil {
+		log.Fatalf("Error decoding JSON: %s", err)
+	}
+
+	tomlData := translate(tmp)
+	if err := toml.NewEncoder(os.Stdout).Encode(tomlData); err != nil {
+		log.Fatalf("Error encoding TOML: %s", err)
+	}
+}
+
+func translate(typedJson interface{}) interface{} {
+	switch v := typedJson.(type) {
+	case map[string]interface{}:
+		if len(v) == 2 && in("type", v) && in("value", v) {
+			return untag(v)
+		}
+		m := make(map[string]interface{}, len(v))
+		for k, v2 := range v {
+			m[k] = translate(v2)
+		}
+		return m
+	case []interface{}:
+		tabArray := make([]map[string]interface{}, len(v))
+		for i := range v {
+			if m, ok := translate(v[i]).(map[string]interface{}); ok {
+				tabArray[i] = m
+			} else {
+				log.Fatalf("JSON arrays may only contain objects. This " +
+					"corresponds to only tables being allowed in " +
+					"TOML table arrays.")
+			}
+		}
+		return tabArray
+	}
+	log.Fatalf("Unrecognized JSON format '%T'.", typedJson)
+	panic("unreachable")
+}
+
+func untag(typed map[string]interface{}) interface{} {
+	t := typed["type"].(string)
+	v := typed["value"]
+	switch t {
+	case "string":
+		return v.(string)
+	case "integer":
+		v := v.(string)
+		n, err := strconv.Atoi(v)
+		if err != nil {
+			log.Fatalf("Could not parse '%s' as integer: %s", v, err)
+		}
+		return n
+	case "float":
+		v := v.(string)
+		f, err := strconv.ParseFloat(v, 64)
+		if err != nil {
+			log.Fatalf("Could not parse '%s' as float64: %s", v, err)
+		}
+		return f
+	case "datetime":
+		v := v.(string)
+		t, err := time.Parse("2006-01-02T15:04:05Z", v)
+		if err != nil {
+			log.Fatalf("Could not parse '%s' as a datetime: %s", v, err)
+		}
+		return t
+	case "bool":
+		v := v.(string)
+		switch v {
+		case "true":
+			return true
+		case "false":
+			return false
+		}
+		log.Fatalf("Could not parse '%s' as a boolean.", v)
+	case "array":
+		v := v.([]interface{})
+		array := make([]interface{}, len(v))
+		for i := range v {
+			if m, ok := v[i].(map[string]interface{}); ok {
+				array[i] = untag(m)
+			} else {
+				log.Fatalf("Arrays may only contain other arrays or "+
+					"primitive values, but found a '%T'.", m)
+			}
+		}
+		return array
+	}
+	log.Fatalf("Unrecognized tag type '%s'.", t)
+	panic("unreachable")
+}
+
+func in(key string, m map[string]interface{}) bool {
+	_, ok := m[key]
+	return ok
+}

vendor/github.com/BurntSushi/toml/cmd/tomlv/README.md

@@ -0,0 +1,22 @@
+# TOML Validator
+
+If Go is installed, it's simple to try it out:
+
+```bash
+go get github.com/BurntSushi/toml/cmd/tomlv
+tomlv some-toml-file.toml
+```
+
+You can see the types of every key in a TOML file with:
+
+```bash
+tomlv -types some-toml-file.toml
+```
+
+At the moment, only one error message is reported at a time. Error messages
+include line numbers. No output means that the files given are valid TOML, or 
+there is a bug in `tomlv`.
+
+Compatible with TOML version
+[v0.1.0](https://github.com/mojombo/toml/blob/master/versions/toml-v0.1.0.md)
+

vendor/github.com/BurntSushi/toml/cmd/tomlv/main.go

@@ -0,0 +1,61 @@
+// Command tomlv validates TOML documents and prints each key's type.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/BurntSushi/toml"
+)
+
+var (
+	flagTypes = false
+)
+
+func init() {
+	log.SetFlags(0)
+
+	flag.BoolVar(&flagTypes, "types", flagTypes,
+		"When set, the types of every defined key will be shown.")
+
+	flag.Usage = usage
+	flag.Parse()
+}
+
+func usage() {
+	log.Printf("Usage: %s toml-file [ toml-file ... ]\n",
+		path.Base(os.Args[0]))
+	flag.PrintDefaults()
+
+	os.Exit(1)
+}
+
+func main() {
+	if flag.NArg() < 1 {
+		flag.Usage()
+	}
+	for _, f := range flag.Args() {
+		var tmp interface{}
+		md, err := toml.DecodeFile(f, &tmp)
+		if err != nil {
+			log.Fatalf("Error in '%s': %s", f, err)
+		}
+		if flagTypes {
+			printTypes(md)
+		}
+	}
+}
+
+func printTypes(md toml.MetaData) {
+	tabw := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+	for _, key := range md.Keys() {
+		fmt.Fprintf(tabw, "%s%s\t%s\n",
+			strings.Repeat("    ", len(key)-1), key, md.Type(key...))
+	}
+	tabw.Flush()
+}

vendor/github.com/BurntSushi/toml/encode_test.go

@@ -0,0 +1,590 @@
+package toml
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"net"
+	"testing"
+	"time"
+)
+
+func TestEncodeRoundTrip(t *testing.T) {
+	type Config struct {
+		Age        int
+		Cats       []string
+		Pi         float64
+		Perfection []int
+		DOB        time.Time
+		Ipaddress  net.IP
+	}
+
+	var inputs = Config{
+		13,
+		[]string{"one", "two", "three"},
+		3.145,
+		[]int{11, 2, 3, 4},
+		time.Now(),
+		net.ParseIP("192.168.59.254"),
+	}
+
+	var firstBuffer bytes.Buffer
+	e := NewEncoder(&firstBuffer)
+	err := e.Encode(inputs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var outputs Config
+	if _, err := Decode(firstBuffer.String(), &outputs); err != nil {
+		log.Printf("Could not decode:\n-----\n%s\n-----\n",
+			firstBuffer.String())
+		t.Fatal(err)
+	}
+
+	// could test each value individually, but I'm lazy
+	var secondBuffer bytes.Buffer
+	e2 := NewEncoder(&secondBuffer)
+	err = e2.Encode(outputs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if firstBuffer.String() != secondBuffer.String() {
+		t.Error(
+			firstBuffer.String(),
+			"\n\n is not identical to\n\n",
+			secondBuffer.String())
+	}
+}
+
+// XXX(burntsushi)
+// I think these tests probably should be removed. They are good, but they
+// ought to be obsolete by toml-test.
+func TestEncode(t *testing.T) {
+	type Embedded struct {
+		Int int `toml:"_int"`
+	}
+	type NonStruct int
+
+	date := time.Date(2014, 5, 11, 20, 30, 40, 0, time.FixedZone("IST", 3600))
+	dateStr := "2014-05-11T19:30:40Z"
+
+	tests := map[string]struct {
+		input      interface{}
+		wantOutput string
+		wantError  error
+	}{
+		"bool field": {
+			input: struct {
+				BoolTrue  bool
+				BoolFalse bool
+			}{true, false},
+			wantOutput: "BoolTrue = true\nBoolFalse = false\n",
+		},
+		"int fields": {
+			input: struct {
+				Int   int
+				Int8  int8
+				Int16 int16
+				Int32 int32
+				Int64 int64
+			}{1, 2, 3, 4, 5},
+			wantOutput: "Int = 1\nInt8 = 2\nInt16 = 3\nInt32 = 4\nInt64 = 5\n",
+		},
+		"uint fields": {
+			input: struct {
+				Uint   uint
+				Uint8  uint8
+				Uint16 uint16
+				Uint32 uint32
+				Uint64 uint64
+			}{1, 2, 3, 4, 5},
+			wantOutput: "Uint = 1\nUint8 = 2\nUint16 = 3\nUint32 = 4" +
+				"\nUint64 = 5\n",
+		},
+		"float fields": {
+			input: struct {
+				Float32 float32
+				Float64 float64
+			}{1.5, 2.5},
+			wantOutput: "Float32 = 1.5\nFloat64 = 2.5\n",
+		},
+		"string field": {
+			input:      struct{ String string }{"foo"},
+			wantOutput: "String = \"foo\"\n",
+		},
+		"string field and unexported field": {
+			input: struct {
+				String     string
+				unexported int
+			}{"foo", 0},
+			wantOutput: "String = \"foo\"\n",
+		},
+		"datetime field in UTC": {
+			input:      struct{ Date time.Time }{date},
+			wantOutput: fmt.Sprintf("Date = %s\n", dateStr),
+		},
+		"datetime field as primitive": {
+			// Using a map here to fail if isStructOrMap() returns true for
+			// time.Time.
+			input: map[string]interface{}{
+				"Date": date,
+				"Int":  1,
+			},
+			wantOutput: fmt.Sprintf("Date = %s\nInt = 1\n", dateStr),
+		},
+		"array fields": {
+			input: struct {
+				IntArray0 [0]int
+				IntArray3 [3]int
+			}{[0]int{}, [3]int{1, 2, 3}},
+			wantOutput: "IntArray0 = []\nIntArray3 = [1, 2, 3]\n",
+		},
+		"slice fields": {
+			input: struct{ IntSliceNil, IntSlice0, IntSlice3 []int }{
+				nil, []int{}, []int{1, 2, 3},
+			},
+			wantOutput: "IntSlice0 = []\nIntSlice3 = [1, 2, 3]\n",
+		},
+		"datetime slices": {
+			input: struct{ DatetimeSlice []time.Time }{
+				[]time.Time{date, date},
+			},
+			wantOutput: fmt.Sprintf("DatetimeSlice = [%s, %s]\n",
+				dateStr, dateStr),
+		},
+		"nested arrays and slices": {
+			input: struct {
+				SliceOfArrays         [][2]int
+				ArrayOfSlices         [2][]int
+				SliceOfArraysOfSlices [][2][]int
+				ArrayOfSlicesOfArrays [2][][2]int
+				SliceOfMixedArrays    [][2]interface{}
+				ArrayOfMixedSlices    [2][]interface{}
+			}{
+				[][2]int{{1, 2}, {3, 4}},
+				[2][]int{{1, 2}, {3, 4}},
+				[][2][]int{
+					{
+						{1, 2}, {3, 4},
+					},
+					{
+						{5, 6}, {7, 8},
+					},
+				},
+				[2][][2]int{
+					{
+						{1, 2}, {3, 4},
+					},
+					{
+						{5, 6}, {7, 8},
+					},
+				},
+				[][2]interface{}{
+					{1, 2}, {"a", "b"},
+				},
+				[2][]interface{}{
+					{1, 2}, {"a", "b"},
+				},
+			},
+			wantOutput: `SliceOfArrays = [[1, 2], [3, 4]]
+ArrayOfSlices = [[1, 2], [3, 4]]
+SliceOfArraysOfSlices = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
+ArrayOfSlicesOfArrays = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
+SliceOfMixedArrays = [[1, 2], ["a", "b"]]
+ArrayOfMixedSlices = [[1, 2], ["a", "b"]]
+`,
+		},
+		"empty slice": {
+			input:      struct{ Empty []interface{} }{[]interface{}{}},
+			wantOutput: "Empty = []\n",
+		},
+		"(error) slice with element type mismatch (string and integer)": {
+			input:     struct{ Mixed []interface{} }{[]interface{}{1, "a"}},
+			wantError: errArrayMixedElementTypes,
+		},
+		"(error) slice with element type mismatch (integer and float)": {
+			input:     struct{ Mixed []interface{} }{[]interface{}{1, 2.5}},
+			wantError: errArrayMixedElementTypes,
+		},
+		"slice with elems of differing Go types, same TOML types": {
+			input: struct {
+				MixedInts   []interface{}
+				MixedFloats []interface{}
+			}{
+				[]interface{}{
+					int(1), int8(2), int16(3), int32(4), int64(5),
+					uint(1), uint8(2), uint16(3), uint32(4), uint64(5),
+				},
+				[]interface{}{float32(1.5), float64(2.5)},
+			},
+			wantOutput: "MixedInts = [1, 2, 3, 4, 5, 1, 2, 3, 4, 5]\n" +
+				"MixedFloats = [1.5, 2.5]\n",
+		},
+		"(error) slice w/ element type mismatch (one is nested array)": {
+			input: struct{ Mixed []interface{} }{
+				[]interface{}{1, []interface{}{2}},
+			},
+			wantError: errArrayMixedElementTypes,
+		},
+		"(error) slice with 1 nil element": {
+			input:     struct{ NilElement1 []interface{} }{[]interface{}{nil}},
+			wantError: errArrayNilElement,
+		},
+		"(error) slice with 1 nil element (and other non-nil elements)": {
+			input: struct{ NilElement []interface{} }{
+				[]interface{}{1, nil},
+			},
+			wantError: errArrayNilElement,
+		},
+		"simple map": {
+			input:      map[string]int{"a": 1, "b": 2},
+			wantOutput: "a = 1\nb = 2\n",
+		},
+		"map with interface{} value type": {
+			input:      map[string]interface{}{"a": 1, "b": "c"},
+			wantOutput: "a = 1\nb = \"c\"\n",
+		},
+		"map with interface{} value type, some of which are structs": {
+			input: map[string]interface{}{
+				"a": struct{ Int int }{2},
+				"b": 1,
+			},
+			wantOutput: "b = 1\n\n[a]\n  Int = 2\n",
+		},
+		"nested map": {
+			input: map[string]map[string]int{
+				"a": {"b": 1},
+				"c": {"d": 2},
+			},
+			wantOutput: "[a]\n  b = 1\n\n[c]\n  d = 2\n",
+		},
+		"nested struct": {
+			input: struct{ Struct struct{ Int int } }{
+				struct{ Int int }{1},
+			},
+			wantOutput: "[Struct]\n  Int = 1\n",
+		},
+		"nested struct and non-struct field": {
+			input: struct {
+				Struct struct{ Int int }
+				Bool   bool
+			}{struct{ Int int }{1}, true},
+			wantOutput: "Bool = true\n\n[Struct]\n  Int = 1\n",
+		},
+		"2 nested structs": {
+			input: struct{ Struct1, Struct2 struct{ Int int } }{
+				struct{ Int int }{1}, struct{ Int int }{2},
+			},
+			wantOutput: "[Struct1]\n  Int = 1\n\n[Struct2]\n  Int = 2\n",
+		},
+		"deeply nested structs": {
+			input: struct {
+				Struct1, Struct2 struct{ Struct3 *struct{ Int int } }
+			}{
+				struct{ Struct3 *struct{ Int int } }{&struct{ Int int }{1}},
+				struct{ Struct3 *struct{ Int int } }{nil},
+			},
+			wantOutput: "[Struct1]\n  [Struct1.Struct3]\n    Int = 1" +
+				"\n\n[Struct2]\n",
+		},
+		"nested struct with nil struct elem": {
+			input: struct {
+				Struct struct{ Inner *struct{ Int int } }
+			}{
+				struct{ Inner *struct{ Int int } }{nil},
+			},
+			wantOutput: "[Struct]\n",
+		},
+		"nested struct with no fields": {
+			input: struct {
+				Struct struct{ Inner struct{} }
+			}{
+				struct{ Inner struct{} }{struct{}{}},
+			},
+			wantOutput: "[Struct]\n  [Struct.Inner]\n",
+		},
+		"struct with tags": {
+			input: struct {
+				Struct struct {
+					Int int `toml:"_int"`
+				} `toml:"_struct"`
+				Bool bool `toml:"_bool"`
+			}{
+				struct {
+					Int int `toml:"_int"`
+				}{1}, true,
+			},
+			wantOutput: "_bool = true\n\n[_struct]\n  _int = 1\n",
+		},
+		"embedded struct": {
+			input:      struct{ Embedded }{Embedded{1}},
+			wantOutput: "_int = 1\n",
+		},
+		"embedded *struct": {
+			input:      struct{ *Embedded }{&Embedded{1}},
+			wantOutput: "_int = 1\n",
+		},
+		"nested embedded struct": {
+			input: struct {
+				Struct struct{ Embedded } `toml:"_struct"`
+			}{struct{ Embedded }{Embedded{1}}},
+			wantOutput: "[_struct]\n  _int = 1\n",
+		},
+		"nested embedded *struct": {
+			input: struct {
+				Struct struct{ *Embedded } `toml:"_struct"`
+			}{struct{ *Embedded }{&Embedded{1}}},
+			wantOutput: "[_struct]\n  _int = 1\n",
+		},
+		"embedded non-struct": {
+			input:      struct{ NonStruct }{5},
+			wantOutput: "NonStruct = 5\n",
+		},
+		"array of tables": {
+			input: struct {
+				Structs []*struct{ Int int } `toml:"struct"`
+			}{
+				[]*struct{ Int int }{{1}, {3}},
+			},
+			wantOutput: "[[struct]]\n  Int = 1\n\n[[struct]]\n  Int = 3\n",
+		},
+		"array of tables order": {
+			input: map[string]interface{}{
+				"map": map[string]interface{}{
+					"zero": 5,
+					"arr": []map[string]int{
+						{
+							"friend": 5,
+						},
+					},
+				},
+			},
+			wantOutput: "[map]\n  zero = 5\n\n  [[map.arr]]\n    friend = 5\n",
+		},
+		"(error) top-level slice": {
+			input:     []struct{ Int int }{{1}, {2}, {3}},
+			wantError: errNoKey,
+		},
+		"(error) slice of slice": {
+			input: struct {
+				Slices [][]struct{ Int int }
+			}{
+				[][]struct{ Int int }{{{1}}, {{2}}, {{3}}},
+			},
+			wantError: errArrayNoTable,
+		},
+		"(error) map no string key": {
+			input:     map[int]string{1: ""},
+			wantError: errNonString,
+		},
+		"(error) empty key name": {
+			input:     map[string]int{"": 1},
+			wantError: errAnything,
+		},
+		"(error) empty map name": {
+			input: map[string]interface{}{
+				"": map[string]int{"v": 1},
+			},
+			wantError: errAnything,
+		},
+	}
+	for label, test := range tests {
+		encodeExpected(t, label, test.input, test.wantOutput, test.wantError)
+	}
+}
+
+func TestEncodeNestedTableArrays(t *testing.T) {
+	type song struct {
+		Name string `toml:"name"`
+	}
+	type album struct {
+		Name  string `toml:"name"`
+		Songs []song `toml:"songs"`
+	}
+	type springsteen struct {
+		Albums []album `toml:"albums"`
+	}
+	value := springsteen{
+		[]album{
+			{"Born to Run",
+				[]song{{"Jungleland"}, {"Meeting Across the River"}}},
+			{"Born in the USA",
+				[]song{{"Glory Days"}, {"Dancing in the Dark"}}},
+		},
+	}
+	expected := `[[albums]]
+  name = "Born to Run"
+
+  [[albums.songs]]
+    name = "Jungleland"
+
+  [[albums.songs]]
+    name = "Meeting Across the River"
+
+[[albums]]
+  name = "Born in the USA"
+
+  [[albums.songs]]
+    name = "Glory Days"
+
+  [[albums.songs]]
+    name = "Dancing in the Dark"
+`
+	encodeExpected(t, "nested table arrays", value, expected, nil)
+}
+
+func TestEncodeArrayHashWithNormalHashOrder(t *testing.T) {
+	type Alpha struct {
+		V int
+	}
+	type Beta struct {
+		V int
+	}
+	type Conf struct {
+		V int
+		A Alpha
+		B []Beta
+	}
+
+	val := Conf{
+		V: 1,
+		A: Alpha{2},
+		B: []Beta{{3}},
+	}
+	expected := "V = 1\n\n[A]\n  V = 2\n\n[[B]]\n  V = 3\n"
+	encodeExpected(t, "array hash with normal hash order", val, expected, nil)
+}
+
+func TestEncodeWithOmitEmpty(t *testing.T) {
+	type simple struct {
+		Bool   bool              `toml:"bool,omitempty"`
+		String string            `toml:"string,omitempty"`
+		Array  [0]byte           `toml:"array,omitempty"`
+		Slice  []int             `toml:"slice,omitempty"`
+		Map    map[string]string `toml:"map,omitempty"`
+	}
+
+	var v simple
+	encodeExpected(t, "fields with omitempty are omitted when empty", v, "", nil)
+	v = simple{
+		Bool:   true,
+		String: " ",
+		Slice:  []int{2, 3, 4},
+		Map:    map[string]string{"foo": "bar"},
+	}
+	expected := `bool = true
+string = " "
+slice = [2, 3, 4]
+
+[map]
+  foo = "bar"
+`
+	encodeExpected(t, "fields with omitempty are not omitted when non-empty",
+		v, expected, nil)
+}
+
+func TestEncodeWithOmitZero(t *testing.T) {
+	type simple struct {
+		Number   int     `toml:"number,omitzero"`
+		Real     float64 `toml:"real,omitzero"`
+		Unsigned uint    `toml:"unsigned,omitzero"`
+	}
+
+	value := simple{0, 0.0, uint(0)}
+	expected := ""
+
+	encodeExpected(t, "simple with omitzero, all zero", value, expected, nil)
+
+	value.Number = 10
+	value.Real = 20
+	value.Unsigned = 5
+	expected = `number = 10
+real = 20.0
+unsigned = 5
+`
+	encodeExpected(t, "simple with omitzero, non-zero", value, expected, nil)
+}
+
+func TestEncodeOmitemptyWithEmptyName(t *testing.T) {
+	type simple struct {
+		S []int `toml:",omitempty"`
+	}
+	v := simple{[]int{1, 2, 3}}
+	expected := "S = [1, 2, 3]\n"
+	encodeExpected(t, "simple with omitempty, no name, non-empty field",
+		v, expected, nil)
+}
+
+func TestEncodeAnonymousStructPointerField(t *testing.T) {
+	type Sub struct{}
+	type simple struct {
+		*Sub
+	}
+
+	value := simple{}
+	expected := ""
+	encodeExpected(t, "nil anonymous struct pointer field", value, expected, nil)
+
+	value = simple{Sub: &Sub{}}
+	expected = ""
+	encodeExpected(t, "non-nil anonymous struct pointer field", value, expected, nil)
+}
+
+func TestEncodeIgnoredFields(t *testing.T) {
+	type simple struct {
+		Number int `toml:"-"`
+	}
+	value := simple{}
+	expected := ""
+	encodeExpected(t, "ignored field", value, expected, nil)
+}
+
+func encodeExpected(
+	t *testing.T, label string, val interface{}, wantStr string, wantErr error,
+) {
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	err := enc.Encode(val)
+	if err != wantErr {
+		if wantErr != nil {
+			if wantErr == errAnything && err != nil {
+				return
+			}
+			t.Errorf("%s: want Encode error %v, got %v", label, wantErr, err)
+		} else {
+			t.Errorf("%s: Encode failed: %s", label, err)
+		}
+	}
+	if err != nil {
+		return
+	}
+	if got := buf.String(); wantStr != got {
+		t.Errorf("%s: want\n-----\n%q\n-----\nbut got\n-----\n%q\n-----\n",
+			label, wantStr, got)
+	}
+}
+
+func ExampleEncoder_Encode() {
+	date, _ := time.Parse(time.RFC822, "14 Mar 10 18:00 UTC")
+	var config = map[string]interface{}{
+		"date":   date,
+		"counts": []int{1, 1, 2, 3, 5, 8},
+		"hash": map[string]string{
+			"key1": "val1",
+			"key2": "val2",
+		},
+	}
+	buf := new(bytes.Buffer)
+	if err := NewEncoder(buf).Encode(config); err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(buf.String())
+
+	// Output:
+	// counts = [1, 1, 2, 3, 5, 8]
+	// date = 2010-03-14T18:00:00Z
+	//
+	// [hash]
+	//   key1 = "val1"
+	//   key2 = "val2"
+}

vendor/github.com/Microsoft/go-winio/.gitignore

@@ -0,0 +1 @@
+*.exe

vendor/github.com/Microsoft/go-winio/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Microsoft
+
+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/Microsoft/go-winio/README.md

@@ -0,0 +1,22 @@
+# go-winio
+
+This repository contains utilities for efficiently performing Win32 IO operations in
+Go. Currently, this is focused on accessing named pipes and other file handles, and
+for using named pipes as a net transport.
+
+This code relies on IO completion ports to avoid blocking IO on system threads, allowing Go
+to reuse the thread to schedule another goroutine. This limits support to Windows Vista and
+newer operating systems. This is similar to the implementation of network sockets in Go's net
+package.
+
+Please see the LICENSE file for licensing information.
+
+This project has adopted the [Microsoft Open Source Code of
+Conduct](https://opensource.microsoft.com/codeofconduct/). For more information
+see the [Code of Conduct
+FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact
+[opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional
+questions or comments.
+
+Thanks to natefinch for the inspiration for this library. See https://github.com/natefinch/npipe
+for another named pipe implementation.

vendor/github.com/Microsoft/go-winio/archive/tar/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * 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.
+   * Neither the name of Google Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+OWNER 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.

vendor/github.com/Microsoft/go-winio/archive/tar/common.go

@@ -0,0 +1,344 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tar implements access to tar archives.
+// It aims to cover most of the variations, including those produced
+// by GNU and BSD tars.
+//
+// References:
+//   http://www.freebsd.org/cgi/man.cgi?query=tar&sektion=5
+//   http://www.gnu.org/software/tar/manual/html_node/Standard.html
+//   http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html
+package tar
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"time"
+)
+
+const (
+	blockSize = 512
+
+	// Types
+	TypeReg           = '0'    // regular file
+	TypeRegA          = '\x00' // regular file
+	TypeLink          = '1'    // hard link
+	TypeSymlink       = '2'    // symbolic link
+	TypeChar          = '3'    // character device node
+	TypeBlock         = '4'    // block device node
+	TypeDir           = '5'    // directory
+	TypeFifo          = '6'    // fifo node
+	TypeCont          = '7'    // reserved
+	TypeXHeader       = 'x'    // extended header
+	TypeXGlobalHeader = 'g'    // global extended header
+	TypeGNULongName   = 'L'    // Next file has a long name
+	TypeGNULongLink   = 'K'    // Next file symlinks to a file w/ a long name
+	TypeGNUSparse     = 'S'    // sparse file
+)
+
+// A Header represents a single header in a tar archive.
+// Some fields may not be populated.
+type Header struct {
+	Name         string    // name of header file entry
+	Mode         int64     // permission and mode bits
+	Uid          int       // user id of owner
+	Gid          int       // group id of owner
+	Size         int64     // length in bytes
+	ModTime      time.Time // modified time
+	Typeflag     byte      // type of header entry
+	Linkname     string    // target name of link
+	Uname        string    // user name of owner
+	Gname        string    // group name of owner
+	Devmajor     int64     // major number of character or block device
+	Devminor     int64     // minor number of character or block device
+	AccessTime   time.Time // access time
+	ChangeTime   time.Time // status change time
+	CreationTime time.Time // creation time
+	Xattrs       map[string]string
+	Winheaders   map[string]string
+}
+
+// File name constants from the tar spec.
+const (
+	fileNameSize       = 100 // Maximum number of bytes in a standard tar name.
+	fileNamePrefixSize = 155 // Maximum number of ustar extension bytes.
+)
+
+// FileInfo returns an os.FileInfo for the Header.
+func (h *Header) FileInfo() os.FileInfo {
+	return headerFileInfo{h}
+}
+
+// headerFileInfo implements os.FileInfo.
+type headerFileInfo struct {
+	h *Header
+}
+
+func (fi headerFileInfo) Size() int64        { return fi.h.Size }
+func (fi headerFileInfo) IsDir() bool        { return fi.Mode().IsDir() }
+func (fi headerFileInfo) ModTime() time.Time { return fi.h.ModTime }
+func (fi headerFileInfo) Sys() interface{}   { return fi.h }
+
+// Name returns the base name of the file.
+func (fi headerFileInfo) Name() string {
+	if fi.IsDir() {
+		return path.Base(path.Clean(fi.h.Name))
+	}
+	return path.Base(fi.h.Name)
+}
+
+// Mode returns the permission and mode bits for the headerFileInfo.
+func (fi headerFileInfo) Mode() (mode os.FileMode) {
+	// Set file permission bits.
+	mode = os.FileMode(fi.h.Mode).Perm()
+
+	// Set setuid, setgid and sticky bits.
+	if fi.h.Mode&c_ISUID != 0 {
+		// setuid
+		mode |= os.ModeSetuid
+	}
+	if fi.h.Mode&c_ISGID != 0 {
+		// setgid
+		mode |= os.ModeSetgid
+	}
+	if fi.h.Mode&c_ISVTX != 0 {
+		// sticky
+		mode |= os.ModeSticky
+	}
+
+	// Set file mode bits.
+	// clear perm, setuid, setgid and sticky bits.
+	m := os.FileMode(fi.h.Mode) &^ 07777
+	if m == c_ISDIR {
+		// directory
+		mode |= os.ModeDir
+	}
+	if m == c_ISFIFO {
+		// named pipe (FIFO)
+		mode |= os.ModeNamedPipe
+	}
+	if m == c_ISLNK {
+		// symbolic link
+		mode |= os.ModeSymlink
+	}
+	if m == c_ISBLK {
+		// device file
+		mode |= os.ModeDevice
+	}
+	if m == c_ISCHR {
+		// Unix character device
+		mode |= os.ModeDevice
+		mode |= os.ModeCharDevice
+	}
+	if m == c_ISSOCK {
+		// Unix domain socket
+		mode |= os.ModeSocket
+	}
+
+	switch fi.h.Typeflag {
+	case TypeSymlink:
+		// symbolic link
+		mode |= os.ModeSymlink
+	case TypeChar:
+		// character device node
+		mode |= os.ModeDevice
+		mode |= os.ModeCharDevice
+	case TypeBlock:
+		// block device node
+		mode |= os.ModeDevice
+	case TypeDir:
+		// directory
+		mode |= os.ModeDir
+	case TypeFifo:
+		// fifo node
+		mode |= os.ModeNamedPipe
+	}
+
+	return mode
+}
+
+// sysStat, if non-nil, populates h from system-dependent fields of fi.
+var sysStat func(fi os.FileInfo, h *Header) error
+
+// Mode constants from the tar spec.
+const (
+	c_ISUID  = 04000   // Set uid
+	c_ISGID  = 02000   // Set gid
+	c_ISVTX  = 01000   // Save text (sticky bit)
+	c_ISDIR  = 040000  // Directory
+	c_ISFIFO = 010000  // FIFO
+	c_ISREG  = 0100000 // Regular file
+	c_ISLNK  = 0120000 // Symbolic link
+	c_ISBLK  = 060000  // Block special file
+	c_ISCHR  = 020000  // Character special file
+	c_ISSOCK = 0140000 // Socket
+)
+
+// Keywords for the PAX Extended Header
+const (
+	paxAtime        = "atime"
+	paxCharset      = "charset"
+	paxComment      = "comment"
+	paxCtime        = "ctime" // please note that ctime is not a valid pax header.
+	paxCreationTime = "LIBARCHIVE.creationtime"
+	paxGid          = "gid"
+	paxGname        = "gname"
+	paxLinkpath     = "linkpath"
+	paxMtime        = "mtime"
+	paxPath         = "path"
+	paxSize         = "size"
+	paxUid          = "uid"
+	paxUname        = "uname"
+	paxXattr        = "SCHILY.xattr."
+	paxWindows      = "MSWINDOWS."
+	paxNone         = ""
+)
+
+// FileInfoHeader creates a partially-populated Header from fi.
+// If fi describes a symlink, FileInfoHeader records link as the link target.
+// If fi describes a directory, a slash is appended to the name.
+// Because os.FileInfo's Name method returns only the base name of
+// the file it describes, it may be necessary to modify the Name field
+// of the returned header to provide the full path name of the file.
+func FileInfoHeader(fi os.FileInfo, link string) (*Header, error) {
+	if fi == nil {
+		return nil, errors.New("tar: FileInfo is nil")
+	}
+	fm := fi.Mode()
+	h := &Header{
+		Name:    fi.Name(),
+		ModTime: fi.ModTime(),
+		Mode:    int64(fm.Perm()), // or'd with c_IS* constants later
+	}
+	switch {
+	case fm.IsRegular():
+		h.Mode |= c_ISREG
+		h.Typeflag = TypeReg
+		h.Size = fi.Size()
+	case fi.IsDir():
+		h.Typeflag = TypeDir
+		h.Mode |= c_ISDIR
+		h.Name += "/"
+	case fm&os.ModeSymlink != 0:
+		h.Typeflag = TypeSymlink
+		h.Mode |= c_ISLNK
+		h.Linkname = link
+	case fm&os.ModeDevice != 0:
+		if fm&os.ModeCharDevice != 0 {
+			h.Mode |= c_ISCHR
+			h.Typeflag = TypeChar
+		} else {
+			h.Mode |= c_ISBLK
+			h.Typeflag = TypeBlock
+		}
+	case fm&os.ModeNamedPipe != 0:
+		h.Typeflag = TypeFifo
+		h.Mode |= c_ISFIFO
+	case fm&os.ModeSocket != 0:
+		h.Mode |= c_ISSOCK
+	default:
+		return nil, fmt.Errorf("archive/tar: unknown file mode %v", fm)
+	}
+	if fm&os.ModeSetuid != 0 {
+		h.Mode |= c_ISUID
+	}
+	if fm&os.ModeSetgid != 0 {
+		h.Mode |= c_ISGID
+	}
+	if fm&os.ModeSticky != 0 {
+		h.Mode |= c_ISVTX
+	}
+	// If possible, populate additional fields from OS-specific
+	// FileInfo fields.
+	if sys, ok := fi.Sys().(*Header); ok {
+		// This FileInfo came from a Header (not the OS). Use the
+		// original Header to populate all remaining fields.
+		h.Uid = sys.Uid
+		h.Gid = sys.Gid
+		h.Uname = sys.Uname
+		h.Gname = sys.Gname
+		h.AccessTime = sys.AccessTime
+		h.ChangeTime = sys.ChangeTime
+		if sys.Xattrs != nil {
+			h.Xattrs = make(map[string]string)
+			for k, v := range sys.Xattrs {
+				h.Xattrs[k] = v
+			}
+		}
+		if sys.Typeflag == TypeLink {
+			// hard link
+			h.Typeflag = TypeLink
+			h.Size = 0
+			h.Linkname = sys.Linkname
+		}
+	}
+	if sysStat != nil {
+		return h, sysStat(fi, h)
+	}
+	return h, nil
+}
+
+var zeroBlock = make([]byte, blockSize)
+
+// POSIX specifies a sum of the unsigned byte values, but the Sun tar uses signed byte values.
+// We compute and return both.
+func checksum(header []byte) (unsigned int64, signed int64) {
+	for i := 0; i < len(header); i++ {
+		if i == 148 {
+			// The chksum field (header[148:156]) is special: it should be treated as space bytes.
+			unsigned += ' ' * 8
+			signed += ' ' * 8
+			i += 7
+			continue
+		}
+		unsigned += int64(header[i])
+		signed += int64(int8(header[i]))
+	}
+	return
+}
+
+type slicer []byte
+
+func (sp *slicer) next(n int) (b []byte) {
+	s := *sp
+	b, *sp = s[0:n], s[n:]
+	return
+}
+
+func isASCII(s string) bool {
+	for _, c := range s {
+		if c >= 0x80 {
+			return false
+		}
+	}
+	return true
+}
+
+func toASCII(s string) string {
+	if isASCII(s) {
+		return s
+	}
+	var buf bytes.Buffer
+	for _, c := range s {
+		if c < 0x80 {
+			buf.WriteByte(byte(c))
+		}
+	}
+	return buf.String()
+}
+
+// isHeaderOnlyType checks if the given type flag is of the type that has no
+// data section even if a size is specified.
+func isHeaderOnlyType(flag byte) bool {
+	switch flag {
+	case TypeLink, TypeSymlink, TypeChar, TypeBlock, TypeDir, TypeFifo:
+		return true
+	default:
+		return false
+	}
+}

vendor/github.com/Microsoft/go-winio/archive/tar/example_test.go

@@ -0,0 +1,80 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar_test
+
+import (
+	"archive/tar"
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func Example() {
+	// Create a buffer to write our archive to.
+	buf := new(bytes.Buffer)
+
+	// Create a new tar archive.
+	tw := tar.NewWriter(buf)
+
+	// Add some files to the archive.
+	var files = []struct {
+		Name, Body string
+	}{
+		{"readme.txt", "This archive contains some text files."},
+		{"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
+		{"todo.txt", "Get animal handling license."},
+	}
+	for _, file := range files {
+		hdr := &tar.Header{
+			Name: file.Name,
+			Mode: 0600,
+			Size: int64(len(file.Body)),
+		}
+		if err := tw.WriteHeader(hdr); err != nil {
+			log.Fatalln(err)
+		}
+		if _, err := tw.Write([]byte(file.Body)); err != nil {
+			log.Fatalln(err)
+		}
+	}
+	// Make sure to check the error on Close.
+	if err := tw.Close(); err != nil {
+		log.Fatalln(err)
+	}
+
+	// Open the tar archive for reading.
+	r := bytes.NewReader(buf.Bytes())
+	tr := tar.NewReader(r)
+
+	// Iterate through the files in the archive.
+	for {
+		hdr, err := tr.Next()
+		if err == io.EOF {
+			// end of tar archive
+			break
+		}
+		if err != nil {
+			log.Fatalln(err)
+		}
+		fmt.Printf("Contents of %s:\n", hdr.Name)
+		if _, err := io.Copy(os.Stdout, tr); err != nil {
+			log.Fatalln(err)
+		}
+		fmt.Println()
+	}
+
+	// Output:
+	// Contents of readme.txt:
+	// This archive contains some text files.
+	// Contents of gopher.txt:
+	// Gopher names:
+	// George
+	// Geoffrey
+	// Gonzo
+	// Contents of todo.txt:
+	// Get animal handling license.
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_atim.go

@@ -0,0 +1,20 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux dragonfly openbsd solaris
+
+package tar
+
+import (
+	"syscall"
+	"time"
+)
+
+func statAtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Atim.Unix())
+}
+
+func statCtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Ctim.Unix())
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_atimespec.go

@@ -0,0 +1,20 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd netbsd
+
+package tar
+
+import (
+	"syscall"
+	"time"
+)
+
+func statAtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Atimespec.Unix())
+}
+
+func statCtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Ctimespec.Unix())
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_unix.go

@@ -0,0 +1,32 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux darwin dragonfly freebsd openbsd netbsd solaris
+
+package tar
+
+import (
+	"os"
+	"syscall"
+)
+
+func init() {
+	sysStat = statUnix
+}
+
+func statUnix(fi os.FileInfo, h *Header) error {
+	sys, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return nil
+	}
+	h.Uid = int(sys.Uid)
+	h.Gid = int(sys.Gid)
+	// TODO(bradfitz): populate username & group.  os/user
+	// doesn't cache LookupId lookups, and lacks group
+	// lookup functions.
+	h.AccessTime = statAtime(sys)
+	h.ChangeTime = statCtime(sys)
+	// TODO(bradfitz): major/minor device numbers?
+	return nil
+}

vendor/github.com/Microsoft/go-winio/archive/tar/tar_test.go

@@ -0,0 +1,325 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestFileInfoHeader(t *testing.T) {
+	fi, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	h, err := FileInfoHeader(fi, "")
+	if err != nil {
+		t.Fatalf("FileInfoHeader: %v", err)
+	}
+	if g, e := h.Name, "small.txt"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	if g, e := h.Mode, int64(fi.Mode().Perm())|c_ISREG; g != e {
+		t.Errorf("Mode = %#o; want %#o", g, e)
+	}
+	if g, e := h.Size, int64(5); g != e {
+		t.Errorf("Size = %v; want %v", g, e)
+	}
+	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
+		t.Errorf("ModTime = %v; want %v", g, e)
+	}
+	// FileInfoHeader should error when passing nil FileInfo
+	if _, err := FileInfoHeader(nil, ""); err == nil {
+		t.Fatalf("Expected error when passing nil to FileInfoHeader")
+	}
+}
+
+func TestFileInfoHeaderDir(t *testing.T) {
+	fi, err := os.Stat("testdata")
+	if err != nil {
+		t.Fatal(err)
+	}
+	h, err := FileInfoHeader(fi, "")
+	if err != nil {
+		t.Fatalf("FileInfoHeader: %v", err)
+	}
+	if g, e := h.Name, "testdata/"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	// Ignoring c_ISGID for golang.org/issue/4867
+	if g, e := h.Mode&^c_ISGID, int64(fi.Mode().Perm())|c_ISDIR; g != e {
+		t.Errorf("Mode = %#o; want %#o", g, e)
+	}
+	if g, e := h.Size, int64(0); g != e {
+		t.Errorf("Size = %v; want %v", g, e)
+	}
+	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
+		t.Errorf("ModTime = %v; want %v", g, e)
+	}
+}
+
+func TestFileInfoHeaderSymlink(t *testing.T) {
+	h, err := FileInfoHeader(symlink{}, "some-target")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if g, e := h.Name, "some-symlink"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	if g, e := h.Linkname, "some-target"; g != e {
+		t.Errorf("Linkname = %q; want %q", g, e)
+	}
+}
+
+type symlink struct{}
+
+func (symlink) Name() string       { return "some-symlink" }
+func (symlink) Size() int64        { return 0 }
+func (symlink) Mode() os.FileMode  { return os.ModeSymlink }
+func (symlink) ModTime() time.Time { return time.Time{} }
+func (symlink) IsDir() bool        { return false }
+func (symlink) Sys() interface{}   { return nil }
+
+func TestRoundTrip(t *testing.T) {
+	data := []byte("some file contents")
+
+	var b bytes.Buffer
+	tw := NewWriter(&b)
+	hdr := &Header{
+		Name:    "file.txt",
+		Uid:     1 << 21, // too big for 8 octal digits
+		Size:    int64(len(data)),
+		ModTime: time.Now(),
+	}
+	// tar only supports second precision.
+	hdr.ModTime = hdr.ModTime.Add(-time.Duration(hdr.ModTime.Nanosecond()) * time.Nanosecond)
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("tw.WriteHeader: %v", err)
+	}
+	if _, err := tw.Write(data); err != nil {
+		t.Fatalf("tw.Write: %v", err)
+	}
+	if err := tw.Close(); err != nil {
+		t.Fatalf("tw.Close: %v", err)
+	}
+
+	// Read it back.
+	tr := NewReader(&b)
+	rHdr, err := tr.Next()
+	if err != nil {
+		t.Fatalf("tr.Next: %v", err)
+	}
+	if !reflect.DeepEqual(rHdr, hdr) {
+		t.Errorf("Header mismatch.\n got %+v\nwant %+v", rHdr, hdr)
+	}
+	rData, err := ioutil.ReadAll(tr)
+	if err != nil {
+		t.Fatalf("Read: %v", err)
+	}
+	if !bytes.Equal(rData, data) {
+		t.Errorf("Data mismatch.\n got %q\nwant %q", rData, data)
+	}
+}
+
+type headerRoundTripTest struct {
+	h  *Header
+	fm os.FileMode
+}
+
+func TestHeaderRoundTrip(t *testing.T) {
+	golden := []headerRoundTripTest{
+		// regular file.
+		{
+			h: &Header{
+				Name:     "test.txt",
+				Mode:     0644 | c_ISREG,
+				Size:     12,
+				ModTime:  time.Unix(1360600916, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0644,
+		},
+		// symbolic link.
+		{
+			h: &Header{
+				Name:     "link.txt",
+				Mode:     0777 | c_ISLNK,
+				Size:     0,
+				ModTime:  time.Unix(1360600852, 0),
+				Typeflag: TypeSymlink,
+			},
+			fm: 0777 | os.ModeSymlink,
+		},
+		// character device node.
+		{
+			h: &Header{
+				Name:     "dev/null",
+				Mode:     0666 | c_ISCHR,
+				Size:     0,
+				ModTime:  time.Unix(1360578951, 0),
+				Typeflag: TypeChar,
+			},
+			fm: 0666 | os.ModeDevice | os.ModeCharDevice,
+		},
+		// block device node.
+		{
+			h: &Header{
+				Name:     "dev/sda",
+				Mode:     0660 | c_ISBLK,
+				Size:     0,
+				ModTime:  time.Unix(1360578954, 0),
+				Typeflag: TypeBlock,
+			},
+			fm: 0660 | os.ModeDevice,
+		},
+		// directory.
+		{
+			h: &Header{
+				Name:     "dir/",
+				Mode:     0755 | c_ISDIR,
+				Size:     0,
+				ModTime:  time.Unix(1360601116, 0),
+				Typeflag: TypeDir,
+			},
+			fm: 0755 | os.ModeDir,
+		},
+		// fifo node.
+		{
+			h: &Header{
+				Name:     "dev/initctl",
+				Mode:     0600 | c_ISFIFO,
+				Size:     0,
+				ModTime:  time.Unix(1360578949, 0),
+				Typeflag: TypeFifo,
+			},
+			fm: 0600 | os.ModeNamedPipe,
+		},
+		// setuid.
+		{
+			h: &Header{
+				Name:     "bin/su",
+				Mode:     0755 | c_ISREG | c_ISUID,
+				Size:     23232,
+				ModTime:  time.Unix(1355405093, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0755 | os.ModeSetuid,
+		},
+		// setguid.
+		{
+			h: &Header{
+				Name:     "group.txt",
+				Mode:     0750 | c_ISREG | c_ISGID,
+				Size:     0,
+				ModTime:  time.Unix(1360602346, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0750 | os.ModeSetgid,
+		},
+		// sticky.
+		{
+			h: &Header{
+				Name:     "sticky.txt",
+				Mode:     0600 | c_ISREG | c_ISVTX,
+				Size:     7,
+				ModTime:  time.Unix(1360602540, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0600 | os.ModeSticky,
+		},
+		// hard link.
+		{
+			h: &Header{
+				Name:     "hard.txt",
+				Mode:     0644 | c_ISREG,
+				Size:     0,
+				Linkname: "file.txt",
+				ModTime:  time.Unix(1360600916, 0),
+				Typeflag: TypeLink,
+			},
+			fm: 0644,
+		},
+		// More information.
+		{
+			h: &Header{
+				Name:     "info.txt",
+				Mode:     0600 | c_ISREG,
+				Size:     0,
+				Uid:      1000,
+				Gid:      1000,
+				ModTime:  time.Unix(1360602540, 0),
+				Uname:    "slartibartfast",
+				Gname:    "users",
+				Typeflag: TypeReg,
+			},
+			fm: 0600,
+		},
+	}
+
+	for i, g := range golden {
+		fi := g.h.FileInfo()
+		h2, err := FileInfoHeader(fi, "")
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if strings.Contains(fi.Name(), "/") {
+			t.Errorf("FileInfo of %q contains slash: %q", g.h.Name, fi.Name())
+		}
+		name := path.Base(g.h.Name)
+		if fi.IsDir() {
+			name += "/"
+		}
+		if got, want := h2.Name, name; got != want {
+			t.Errorf("i=%d: Name: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Size, g.h.Size; got != want {
+			t.Errorf("i=%d: Size: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Uid, g.h.Uid; got != want {
+			t.Errorf("i=%d: Uid: got %d, want %d", i, got, want)
+		}
+		if got, want := h2.Gid, g.h.Gid; got != want {
+			t.Errorf("i=%d: Gid: got %d, want %d", i, got, want)
+		}
+		if got, want := h2.Uname, g.h.Uname; got != want {
+			t.Errorf("i=%d: Uname: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Gname, g.h.Gname; got != want {
+			t.Errorf("i=%d: Gname: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Linkname, g.h.Linkname; got != want {
+			t.Errorf("i=%d: Linkname: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Typeflag, g.h.Typeflag; got != want {
+			t.Logf("%#v %#v", g.h, fi.Sys())
+			t.Errorf("i=%d: Typeflag: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Mode, g.h.Mode; got != want {
+			t.Errorf("i=%d: Mode: got %o, want %o", i, got, want)
+		}
+		if got, want := fi.Mode(), g.fm; got != want {
+			t.Errorf("i=%d: fi.Mode: got %o, want %o", i, got, want)
+		}
+		if got, want := h2.AccessTime, g.h.AccessTime; got != want {
+			t.Errorf("i=%d: AccessTime: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.ChangeTime, g.h.ChangeTime; got != want {
+			t.Errorf("i=%d: ChangeTime: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.ModTime, g.h.ModTime; got != want {
+			t.Errorf("i=%d: ModTime: got %v, want %v", i, got, want)
+		}
+		if sysh, ok := fi.Sys().(*Header); !ok || sysh != g.h {
+			t.Errorf("i=%d: Sys didn't return original *Header", i)
+		}
+	}
+}

vendor/github.com/Microsoft/go-winio/archive/tar/testdata/small.txt

@@ -0,0 +1 @@
+Kilts

vendor/github.com/Microsoft/go-winio/archive/tar/testdata/small2.txt

@@ -0,0 +1 @@
+Google.com

vendor/github.com/Microsoft/go-winio/archive/tar/writer.go

@@ -0,0 +1,444 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+// TODO(dsymonds):
+// - catch more errors (no first header, etc.)
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"path"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	ErrWriteTooLong    = errors.New("archive/tar: write too long")
+	ErrFieldTooLong    = errors.New("archive/tar: header field too long")
+	ErrWriteAfterClose = errors.New("archive/tar: write after close")
+	errInvalidHeader   = errors.New("archive/tar: header field too long or contains invalid values")
+)
+
+// A Writer provides sequential writing of a tar archive in POSIX.1 format.
+// A tar archive consists of a sequence of files.
+// Call WriteHeader to begin a new file, and then call Write to supply that file's data,
+// writing at most hdr.Size bytes in total.
+type Writer struct {
+	w          io.Writer
+	err        error
+	nb         int64 // number of unwritten bytes for current file entry
+	pad        int64 // amount of padding to write after current file entry
+	closed     bool
+	usedBinary bool            // whether the binary numeric field extension was used
+	preferPax  bool            // use pax header instead of binary numeric header
+	hdrBuff    [blockSize]byte // buffer to use in writeHeader when writing a regular header
+	paxHdrBuff [blockSize]byte // buffer to use in writeHeader when writing a pax header
+}
+
+type formatter struct {
+	err error // Last error seen
+}
+
+// NewWriter creates a new Writer writing to w.
+func NewWriter(w io.Writer) *Writer { return &Writer{w: w, preferPax: true} }
+
+// Flush finishes writing the current file (optional).
+func (tw *Writer) Flush() error {
+	if tw.nb > 0 {
+		tw.err = fmt.Errorf("archive/tar: missed writing %d bytes", tw.nb)
+		return tw.err
+	}
+
+	n := tw.nb + tw.pad
+	for n > 0 && tw.err == nil {
+		nr := n
+		if nr > blockSize {
+			nr = blockSize
+		}
+		var nw int
+		nw, tw.err = tw.w.Write(zeroBlock[0:nr])
+		n -= int64(nw)
+	}
+	tw.nb = 0
+	tw.pad = 0
+	return tw.err
+}
+
+// Write s into b, terminating it with a NUL if there is room.
+func (f *formatter) formatString(b []byte, s string) {
+	if len(s) > len(b) {
+		f.err = ErrFieldTooLong
+		return
+	}
+	ascii := toASCII(s)
+	copy(b, ascii)
+	if len(ascii) < len(b) {
+		b[len(ascii)] = 0
+	}
+}
+
+// Encode x as an octal ASCII string and write it into b with leading zeros.
+func (f *formatter) formatOctal(b []byte, x int64) {
+	s := strconv.FormatInt(x, 8)
+	// leading zeros, but leave room for a NUL.
+	for len(s)+1 < len(b) {
+		s = "0" + s
+	}
+	f.formatString(b, s)
+}
+
+// fitsInBase256 reports whether x can be encoded into n bytes using base-256
+// encoding. Unlike octal encoding, base-256 encoding does not require that the
+// string ends with a NUL character. Thus, all n bytes are available for output.
+//
+// If operating in binary mode, this assumes strict GNU binary mode; which means
+// that the first byte can only be either 0x80 or 0xff. Thus, the first byte is
+// equivalent to the sign bit in two's complement form.
+func fitsInBase256(n int, x int64) bool {
+	var binBits = uint(n-1) * 8
+	return n >= 9 || (x >= -1<<binBits && x < 1<<binBits)
+}
+
+// Write x into b, as binary (GNUtar/star extension).
+func (f *formatter) formatNumeric(b []byte, x int64) {
+	if fitsInBase256(len(b), x) {
+		for i := len(b) - 1; i >= 0; i-- {
+			b[i] = byte(x)
+			x >>= 8
+		}
+		b[0] |= 0x80 // Highest bit indicates binary format
+		return
+	}
+
+	f.formatOctal(b, 0) // Last resort, just write zero
+	f.err = ErrFieldTooLong
+}
+
+var (
+	minTime = time.Unix(0, 0)
+	// There is room for 11 octal digits (33 bits) of mtime.
+	maxTime = minTime.Add((1<<33 - 1) * time.Second)
+)
+
+// WriteHeader writes hdr and prepares to accept the file's contents.
+// WriteHeader calls Flush if it is not the first header.
+// Calling after a Close will return ErrWriteAfterClose.
+func (tw *Writer) WriteHeader(hdr *Header) error {
+	return tw.writeHeader(hdr, true)
+}
+
+// WriteHeader writes hdr and prepares to accept the file's contents.
+// WriteHeader calls Flush if it is not the first header.
+// Calling after a Close will return ErrWriteAfterClose.
+// As this method is called internally by writePax header to allow it to
+// suppress writing the pax header.
+func (tw *Writer) writeHeader(hdr *Header, allowPax bool) error {
+	if tw.closed {
+		return ErrWriteAfterClose
+	}
+	if tw.err == nil {
+		tw.Flush()
+	}
+	if tw.err != nil {
+		return tw.err
+	}
+
+	// a map to hold pax header records, if any are needed
+	paxHeaders := make(map[string]string)
+
+	// TODO(shanemhansen): we might want to use PAX headers for
+	// subsecond time resolution, but for now let's just capture
+	// too long fields or non ascii characters
+
+	var f formatter
+	var header []byte
+
+	// We need to select which scratch buffer to use carefully,
+	// since this method is called recursively to write PAX headers.
+	// If allowPax is true, this is the non-recursive call, and we will use hdrBuff.
+	// If allowPax is false, we are being called by writePAXHeader, and hdrBuff is
+	// already being used by the non-recursive call, so we must use paxHdrBuff.
+	header = tw.hdrBuff[:]
+	if !allowPax {
+		header = tw.paxHdrBuff[:]
+	}
+	copy(header, zeroBlock)
+	s := slicer(header)
+
+	// Wrappers around formatter that automatically sets paxHeaders if the
+	// argument extends beyond the capacity of the input byte slice.
+	var formatString = func(b []byte, s string, paxKeyword string) {
+		needsPaxHeader := paxKeyword != paxNone && len(s) > len(b) || !isASCII(s)
+		if needsPaxHeader {
+			paxHeaders[paxKeyword] = s
+			return
+		}
+		f.formatString(b, s)
+	}
+	var formatNumeric = func(b []byte, x int64, paxKeyword string) {
+		// Try octal first.
+		s := strconv.FormatInt(x, 8)
+		if len(s) < len(b) {
+			f.formatOctal(b, x)
+			return
+		}
+
+		// If it is too long for octal, and PAX is preferred, use a PAX header.
+		if paxKeyword != paxNone && tw.preferPax {
+			f.formatOctal(b, 0)
+			s := strconv.FormatInt(x, 10)
+			paxHeaders[paxKeyword] = s
+			return
+		}
+
+		tw.usedBinary = true
+		f.formatNumeric(b, x)
+	}
+	var formatTime = func(b []byte, t time.Time, paxKeyword string) {
+		var unixTime int64
+		if !t.Before(minTime) && !t.After(maxTime) {
+			unixTime = t.Unix()
+		}
+		formatNumeric(b, unixTime, paxNone)
+
+		// Write a PAX header if the time didn't fit precisely.
+		if paxKeyword != "" && tw.preferPax && allowPax && (t.Nanosecond() != 0 || !t.Before(minTime) || !t.After(maxTime)) {
+			paxHeaders[paxKeyword] = formatPAXTime(t)
+		}
+	}
+
+	// keep a reference to the filename to allow to overwrite it later if we detect that we can use ustar longnames instead of pax
+	pathHeaderBytes := s.next(fileNameSize)
+
+	formatString(pathHeaderBytes, hdr.Name, paxPath)
+
+	f.formatOctal(s.next(8), hdr.Mode)               // 100:108
+	formatNumeric(s.next(8), int64(hdr.Uid), paxUid) // 108:116
+	formatNumeric(s.next(8), int64(hdr.Gid), paxGid) // 116:124
+	formatNumeric(s.next(12), hdr.Size, paxSize)     // 124:136
+	formatTime(s.next(12), hdr.ModTime, paxMtime)    // 136:148
+	s.next(8)                                        // chksum (148:156)
+	s.next(1)[0] = hdr.Typeflag                      // 156:157
+
+	formatString(s.next(100), hdr.Linkname, paxLinkpath)
+
+	copy(s.next(8), []byte("ustar\x0000"))          // 257:265
+	formatString(s.next(32), hdr.Uname, paxUname)   // 265:297
+	formatString(s.next(32), hdr.Gname, paxGname)   // 297:329
+	formatNumeric(s.next(8), hdr.Devmajor, paxNone) // 329:337
+	formatNumeric(s.next(8), hdr.Devminor, paxNone) // 337:345
+
+	// keep a reference to the prefix to allow to overwrite it later if we detect that we can use ustar longnames instead of pax
+	prefixHeaderBytes := s.next(155)
+	formatString(prefixHeaderBytes, "", paxNone) // 345:500  prefix
+
+	// Use the GNU magic instead of POSIX magic if we used any GNU extensions.
+	if tw.usedBinary {
+		copy(header[257:265], []byte("ustar  \x00"))
+	}
+
+	_, paxPathUsed := paxHeaders[paxPath]
+	// try to use a ustar header when only the name is too long
+	if !tw.preferPax && len(paxHeaders) == 1 && paxPathUsed {
+		prefix, suffix, ok := splitUSTARPath(hdr.Name)
+		if ok {
+			// Since we can encode in USTAR format, disable PAX header.
+			delete(paxHeaders, paxPath)
+
+			// Update the path fields
+			formatString(pathHeaderBytes, suffix, paxNone)
+			formatString(prefixHeaderBytes, prefix, paxNone)
+		}
+	}
+
+	// The chksum field is terminated by a NUL and a space.
+	// This is different from the other octal fields.
+	chksum, _ := checksum(header)
+	f.formatOctal(header[148:155], chksum) // Never fails
+	header[155] = ' '
+
+	// Check if there were any formatting errors.
+	if f.err != nil {
+		tw.err = f.err
+		return tw.err
+	}
+
+	if allowPax {
+		if !hdr.AccessTime.IsZero() {
+			paxHeaders[paxAtime] = formatPAXTime(hdr.AccessTime)
+		}
+		if !hdr.ChangeTime.IsZero() {
+			paxHeaders[paxCtime] = formatPAXTime(hdr.ChangeTime)
+		}
+		if !hdr.CreationTime.IsZero() {
+			paxHeaders[paxCreationTime] = formatPAXTime(hdr.CreationTime)
+		}
+		for k, v := range hdr.Xattrs {
+			paxHeaders[paxXattr+k] = v
+		}
+		for k, v := range hdr.Winheaders {
+			paxHeaders[paxWindows+k] = v
+		}
+	}
+
+	if len(paxHeaders) > 0 {
+		if !allowPax {
+			return errInvalidHeader
+		}
+		if err := tw.writePAXHeader(hdr, paxHeaders); err != nil {
+			return err
+		}
+	}
+	tw.nb = int64(hdr.Size)
+	tw.pad = (blockSize - (tw.nb % blockSize)) % blockSize
+
+	_, tw.err = tw.w.Write(header)
+	return tw.err
+}
+
+func formatPAXTime(t time.Time) string {
+	sec := t.Unix()
+	usec := t.Nanosecond()
+	s := strconv.FormatInt(sec, 10)
+	if usec != 0 {
+		s = fmt.Sprintf("%s.%09d", s, usec)
+	}
+	return s
+}
+
+// splitUSTARPath splits a path according to USTAR prefix and suffix rules.
+// If the path is not splittable, then it will return ("", "", false).
+func splitUSTARPath(name string) (prefix, suffix string, ok bool) {
+	length := len(name)
+	if length <= fileNameSize || !isASCII(name) {
+		return "", "", false
+	} else if length > fileNamePrefixSize+1 {
+		length = fileNamePrefixSize + 1
+	} else if name[length-1] == '/' {
+		length--
+	}
+
+	i := strings.LastIndex(name[:length], "/")
+	nlen := len(name) - i - 1 // nlen is length of suffix
+	plen := i                 // plen is length of prefix
+	if i <= 0 || nlen > fileNameSize || nlen == 0 || plen > fileNamePrefixSize {
+		return "", "", false
+	}
+	return name[:i], name[i+1:], true
+}
+
+// writePaxHeader writes an extended pax header to the
+// archive.
+func (tw *Writer) writePAXHeader(hdr *Header, paxHeaders map[string]string) error {
+	// Prepare extended header
+	ext := new(Header)
+	ext.Typeflag = TypeXHeader
+	// Setting ModTime is required for reader parsing to
+	// succeed, and seems harmless enough.
+	ext.ModTime = hdr.ModTime
+	// The spec asks that we namespace our pseudo files
+	// with the current pid.  However, this results in differing outputs
+	// for identical inputs.  As such, the constant 0 is now used instead.
+	// golang.org/issue/12358
+	dir, file := path.Split(hdr.Name)
+	fullName := path.Join(dir, "PaxHeaders.0", file)
+
+	ascii := toASCII(fullName)
+	if len(ascii) > 100 {
+		ascii = ascii[:100]
+	}
+	ext.Name = ascii
+	// Construct the body
+	var buf bytes.Buffer
+
+	// Keys are sorted before writing to body to allow deterministic output.
+	var keys []string
+	for k := range paxHeaders {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	for _, k := range keys {
+		fmt.Fprint(&buf, formatPAXRecord(k, paxHeaders[k]))
+	}
+
+	ext.Size = int64(len(buf.Bytes()))
+	if err := tw.writeHeader(ext, false); err != nil {
+		return err
+	}
+	if _, err := tw.Write(buf.Bytes()); err != nil {
+		return err
+	}
+	if err := tw.Flush(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// formatPAXRecord formats a single PAX record, prefixing it with the
+// appropriate length.
+func formatPAXRecord(k, v string) string {
+	const padding = 3 // Extra padding for ' ', '=', and '\n'
+	size := len(k) + len(v) + padding
+	size += len(strconv.Itoa(size))
+	record := fmt.Sprintf("%d %s=%s\n", size, k, v)
+
+	// Final adjustment if adding size field increased the record size.
+	if len(record) != size {
+		size = len(record)
+		record = fmt.Sprintf("%d %s=%s\n", size, k, v)
+	}
+	return record
+}
+
+// Write writes to the current entry in the tar archive.
+// Write returns the error ErrWriteTooLong if more than
+// hdr.Size bytes are written after WriteHeader.
+func (tw *Writer) Write(b []byte) (n int, err error) {
+	if tw.closed {
+		err = ErrWriteAfterClose
+		return
+	}
+	overwrite := false
+	if int64(len(b)) > tw.nb {
+		b = b[0:tw.nb]
+		overwrite = true
+	}
+	n, err = tw.w.Write(b)
+	tw.nb -= int64(n)
+	if err == nil && overwrite {
+		err = ErrWriteTooLong
+		return
+	}
+	tw.err = err
+	return
+}
+
+// Close closes the tar archive, flushing any unwritten
+// data to the underlying writer.
+func (tw *Writer) Close() error {
+	if tw.err != nil || tw.closed {
+		return tw.err
+	}
+	tw.Flush()
+	tw.closed = true
+	if tw.err != nil {
+		return tw.err
+	}
+
+	// trailer: two zero blocks
+	for i := 0; i < 2; i++ {
+		_, tw.err = tw.w.Write(zeroBlock)
+		if tw.err != nil {
+			break
+		}
+	}
+	return tw.err
+}

vendor/github.com/Microsoft/go-winio/archive/tar/writer_test.go

@@ -0,0 +1,739 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math"
+	"os"
+	"reflect"
+	"sort"
+	"strings"
+	"testing"
+	"testing/iotest"
+	"time"
+)
+
+type writerTestEntry struct {
+	header   *Header
+	contents string
+}
+
+type writerTest struct {
+	file    string // filename of expected output
+	entries []*writerTestEntry
+}
+
+var writerTests = []*writerTest{
+	// The writer test file was produced with this command:
+	// tar (GNU tar) 1.26
+	//   ln -s small.txt link.txt
+	//   tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt
+	{
+		file: "testdata/writer.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "small.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     5,
+					ModTime:  time.Unix(1246508266, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				contents: "Kilts",
+			},
+			{
+				header: &Header{
+					Name:     "small2.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     11,
+					ModTime:  time.Unix(1245217492, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				contents: "Google.com\n",
+			},
+			{
+				header: &Header{
+					Name:     "link.txt",
+					Mode:     0777,
+					Uid:      1000,
+					Gid:      1000,
+					Size:     0,
+					ModTime:  time.Unix(1314603082, 0),
+					Typeflag: '2',
+					Linkname: "small.txt",
+					Uname:    "strings",
+					Gname:    "strings",
+				},
+				// no contents
+			},
+		},
+	},
+	// The truncated test file was produced using these commands:
+	//   dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt
+	//   tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar
+	{
+		file: "testdata/writer-big.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "tmp/16gig.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     16 << 30,
+					ModTime:  time.Unix(1254699560, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				// fake contents
+				contents: strings.Repeat("\x00", 4<<10),
+			},
+		},
+	},
+	// The truncated test file was produced using these commands:
+	//   dd if=/dev/zero bs=1048576 count=16384 > (longname/)*15 /16gig.txt
+	//   tar -b 1 -c -f- (longname/)*15 /16gig.txt | dd bs=512 count=8 > writer-big-long.tar
+	{
+		file: "testdata/writer-big-long.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     strings.Repeat("longname/", 15) + "16gig.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      1000,
+					Size:     16 << 30,
+					ModTime:  time.Unix(1399583047, 0),
+					Typeflag: '0',
+					Uname:    "guillaume",
+					Gname:    "guillaume",
+				},
+				// fake contents
+				contents: strings.Repeat("\x00", 4<<10),
+			},
+		},
+	},
+	// This file was produced using gnu tar 1.17
+	// gnutar  -b 4 --format=ustar (longname/)*15 + file.txt
+	{
+		file: "testdata/ustar.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     strings.Repeat("longname/", 15) + "file.txt",
+					Mode:     0644,
+					Uid:      0765,
+					Gid:      024,
+					Size:     06,
+					ModTime:  time.Unix(1360135598, 0),
+					Typeflag: '0',
+					Uname:    "shane",
+					Gname:    "staff",
+				},
+				contents: "hello\n",
+			},
+		},
+	},
+	// This file was produced using gnu tar 1.26
+	// echo "Slartibartfast" > file.txt
+	// ln file.txt hard.txt
+	// tar -b 1 --format=ustar -c -f hardlink.tar file.txt hard.txt
+	{
+		file: "testdata/hardlink.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "file.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      100,
+					Size:     15,
+					ModTime:  time.Unix(1425484303, 0),
+					Typeflag: '0',
+					Uname:    "vbatts",
+					Gname:    "users",
+				},
+				contents: "Slartibartfast\n",
+			},
+			{
+				header: &Header{
+					Name:     "hard.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      100,
+					Size:     0,
+					ModTime:  time.Unix(1425484303, 0),
+					Typeflag: '1',
+					Linkname: "file.txt",
+					Uname:    "vbatts",
+					Gname:    "users",
+				},
+				// no contents
+			},
+		},
+	},
+}
+
+// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.
+func bytestr(offset int, b []byte) string {
+	const rowLen = 32
+	s := fmt.Sprintf("%04x ", offset)
+	for _, ch := range b {
+		switch {
+		case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':
+			s += fmt.Sprintf("  %c", ch)
+		default:
+			s += fmt.Sprintf(" %02x", ch)
+		}
+	}
+	return s
+}
+
+// Render a pseudo-diff between two blocks of bytes.
+func bytediff(a []byte, b []byte) string {
+	const rowLen = 32
+	s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))
+	for offset := 0; len(a)+len(b) > 0; offset += rowLen {
+		na, nb := rowLen, rowLen
+		if na > len(a) {
+			na = len(a)
+		}
+		if nb > len(b) {
+			nb = len(b)
+		}
+		sa := bytestr(offset, a[0:na])
+		sb := bytestr(offset, b[0:nb])
+		if sa != sb {
+			s += fmt.Sprintf("-%v\n+%v\n", sa, sb)
+		}
+		a = a[na:]
+		b = b[nb:]
+	}
+	return s
+}
+
+func TestWriter(t *testing.T) {
+testLoop:
+	for i, test := range writerTests {
+		expected, err := ioutil.ReadFile(test.file)
+		if err != nil {
+			t.Errorf("test %d: Unexpected error: %v", i, err)
+			continue
+		}
+
+		buf := new(bytes.Buffer)
+		tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
+		big := false
+		for j, entry := range test.entries {
+			big = big || entry.header.Size > 1<<10
+			if err := tw.WriteHeader(entry.header); err != nil {
+				t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
+				continue testLoop
+			}
+			if _, err := io.WriteString(tw, entry.contents); err != nil {
+				t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)
+				continue testLoop
+			}
+		}
+		// Only interested in Close failures for the small tests.
+		if err := tw.Close(); err != nil && !big {
+			t.Errorf("test %d: Failed closing archive: %v", i, err)
+			continue testLoop
+		}
+
+		actual := buf.Bytes()
+		if !bytes.Equal(expected, actual) {
+			t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",
+				i, bytediff(expected, actual))
+		}
+		if testing.Short() { // The second test is expensive.
+			break
+		}
+	}
+}
+
+func TestPax(t *testing.T) {
+	// Create an archive with a large name
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	// Force a PAX long name to be written
+	longName := strings.Repeat("ab", 100)
+	contents := strings.Repeat(" ", int(hdr.Size))
+	hdr.Name = longName
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != longName {
+		t.Fatal("Couldn't recover long file name")
+	}
+}
+
+func TestPaxSymlink(t *testing.T) {
+	// Create an archive with a large linkname
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	hdr.Typeflag = TypeSymlink
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+	// Force a PAX long linkname to be written
+	longLinkname := strings.Repeat("1234567890/1234567890", 10)
+	hdr.Linkname = longLinkname
+
+	hdr.Size = 0
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Linkname != longLinkname {
+		t.Fatal("Couldn't recover long link name")
+	}
+}
+
+func TestPaxNonAscii(t *testing.T) {
+	// Create an archive with non ascii. These should trigger a pax header
+	// because pax headers have a defined utf-8 encoding.
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+
+	// some sample data
+	chineseFilename := "文件名"
+	chineseGroupname := "組"
+	chineseUsername := "用戶名"
+
+	hdr.Name = chineseFilename
+	hdr.Gname = chineseGroupname
+	hdr.Uname = chineseUsername
+
+	contents := strings.Repeat(" ", int(hdr.Size))
+
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != chineseFilename {
+		t.Fatal("Couldn't recover unicode name")
+	}
+	if hdr.Gname != chineseGroupname {
+		t.Fatal("Couldn't recover unicode group")
+	}
+	if hdr.Uname != chineseUsername {
+		t.Fatal("Couldn't recover unicode user")
+	}
+}
+
+func TestPaxXattrs(t *testing.T) {
+	xattrs := map[string]string{
+		"user.key": "value",
+	}
+
+	// Create an archive with an xattr
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	contents := "Kilts"
+	hdr.Xattrs = xattrs
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Test that we can get the xattrs back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(hdr.Xattrs, xattrs) {
+		t.Fatalf("xattrs did not survive round trip: got %+v, want %+v",
+			hdr.Xattrs, xattrs)
+	}
+}
+
+func TestPaxHeadersSorted(t *testing.T) {
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	contents := strings.Repeat(" ", int(hdr.Size))
+
+	hdr.Xattrs = map[string]string{
+		"foo": "foo",
+		"bar": "bar",
+		"baz": "baz",
+		"qux": "qux",
+	}
+
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+
+	// xattr bar should always appear before others
+	indices := []int{
+		bytes.Index(buf.Bytes(), []byte("bar=bar")),
+		bytes.Index(buf.Bytes(), []byte("baz=baz")),
+		bytes.Index(buf.Bytes(), []byte("foo=foo")),
+		bytes.Index(buf.Bytes(), []byte("qux=qux")),
+	}
+	if !sort.IntsAreSorted(indices) {
+		t.Fatal("PAX headers are not sorted")
+	}
+}
+
+func TestUSTARLongName(t *testing.T) {
+	// Create an archive with a path that failed to split with USTAR extension in previous versions.
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	hdr.Typeflag = TypeDir
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+	// Force a PAX long name to be written. The name was taken from a practical example
+	// that fails and replaced ever char through numbers to anonymize the sample.
+	longName := "/0000_0000000/00000-000000000/0000_0000000/00000-0000000000000/0000_0000000/00000-0000000-00000000/0000_0000000/00000000/0000_0000000/000/0000_0000000/00000000v00/0000_0000000/000000/0000_0000000/0000000/0000_0000000/00000y-00/0000/0000/00000000/0x000000/"
+	hdr.Name = longName
+
+	hdr.Size = 0
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != longName {
+		t.Fatal("Couldn't recover long name")
+	}
+}
+
+func TestValidTypeflagWithPAXHeader(t *testing.T) {
+	var buffer bytes.Buffer
+	tw := NewWriter(&buffer)
+
+	fileName := strings.Repeat("ab", 100)
+
+	hdr := &Header{
+		Name:     fileName,
+		Size:     4,
+		Typeflag: 0,
+	}
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("Failed to write header: %s", err)
+	}
+	if _, err := tw.Write([]byte("fooo")); err != nil {
+		t.Fatalf("Failed to write the file's data: %s", err)
+	}
+	tw.Close()
+
+	tr := NewReader(&buffer)
+
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatalf("Failed to read header: %s", err)
+		}
+		if header.Typeflag != 0 {
+			t.Fatalf("Typeflag should've been 0, found %d", header.Typeflag)
+		}
+	}
+}
+
+func TestWriteAfterClose(t *testing.T) {
+	var buffer bytes.Buffer
+	tw := NewWriter(&buffer)
+
+	hdr := &Header{
+		Name: "small.txt",
+		Size: 5,
+	}
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("Failed to write header: %s", err)
+	}
+	tw.Close()
+	if _, err := tw.Write([]byte("Kilts")); err != ErrWriteAfterClose {
+		t.Fatalf("Write: got %v; want ErrWriteAfterClose", err)
+	}
+}
+
+func TestSplitUSTARPath(t *testing.T) {
+	var sr = strings.Repeat
+
+	var vectors = []struct {
+		input  string // Input path
+		prefix string // Expected output prefix
+		suffix string // Expected output suffix
+		ok     bool   // Split success?
+	}{
+		{"", "", "", false},
+		{"abc", "", "", false},
+		{"用戶名", "", "", false},
+		{sr("a", fileNameSize), "", "", false},
+		{sr("a", fileNameSize) + "/", "", "", false},
+		{sr("a", fileNameSize) + "/a", sr("a", fileNameSize), "a", true},
+		{sr("a", fileNamePrefixSize) + "/", "", "", false},
+		{sr("a", fileNamePrefixSize) + "/a", sr("a", fileNamePrefixSize), "a", true},
+		{sr("a", fileNameSize+1), "", "", false},
+		{sr("/", fileNameSize+1), sr("/", fileNameSize-1), "/", true},
+		{sr("a", fileNamePrefixSize) + "/" + sr("b", fileNameSize),
+			sr("a", fileNamePrefixSize), sr("b", fileNameSize), true},
+		{sr("a", fileNamePrefixSize) + "//" + sr("b", fileNameSize), "", "", false},
+		{sr("a/", fileNameSize), sr("a/", 77) + "a", sr("a/", 22), true},
+	}
+
+	for _, v := range vectors {
+		prefix, suffix, ok := splitUSTARPath(v.input)
+		if prefix != v.prefix || suffix != v.suffix || ok != v.ok {
+			t.Errorf("splitUSTARPath(%q):\ngot  (%q, %q, %v)\nwant (%q, %q, %v)",
+				v.input, prefix, suffix, ok, v.prefix, v.suffix, v.ok)
+		}
+	}
+}
+
+func TestFormatPAXRecord(t *testing.T) {
+	var medName = strings.Repeat("CD", 50)
+	var longName = strings.Repeat("AB", 100)
+
+	var vectors = []struct {
+		inputKey string
+		inputVal string
+		output   string
+	}{
+		{"k", "v", "6 k=v\n"},
+		{"path", "/etc/hosts", "19 path=/etc/hosts\n"},
+		{"path", longName, "210 path=" + longName + "\n"},
+		{"path", medName, "110 path=" + medName + "\n"},
+		{"foo", "ba", "9 foo=ba\n"},
+		{"foo", "bar", "11 foo=bar\n"},
+		{"foo", "b=\nar=\n==\x00", "18 foo=b=\nar=\n==\x00\n"},
+		{"foo", "hello9 foo=ba\nworld", "27 foo=hello9 foo=ba\nworld\n"},
+		{"☺☻☹", "日a本b語ç", "27 ☺☻☹=日a本b語ç\n"},
+		{"\x00hello", "\x00world", "17 \x00hello=\x00world\n"},
+	}
+
+	for _, v := range vectors {
+		output := formatPAXRecord(v.inputKey, v.inputVal)
+		if output != v.output {
+			t.Errorf("formatPAXRecord(%q, %q): got %q, want %q",
+				v.inputKey, v.inputVal, output, v.output)
+		}
+	}
+}
+
+func TestFitsInBase256(t *testing.T) {
+	var vectors = []struct {
+		input int64
+		width int
+		ok    bool
+	}{
+		{+1, 8, true},
+		{0, 8, true},
+		{-1, 8, true},
+		{1 << 56, 8, false},
+		{(1 << 56) - 1, 8, true},
+		{-1 << 56, 8, true},
+		{(-1 << 56) - 1, 8, false},
+		{121654, 8, true},
+		{-9849849, 8, true},
+		{math.MaxInt64, 9, true},
+		{0, 9, true},
+		{math.MinInt64, 9, true},
+		{math.MaxInt64, 12, true},
+		{0, 12, true},
+		{math.MinInt64, 12, true},
+	}
+
+	for _, v := range vectors {
+		ok := fitsInBase256(v.width, v.input)
+		if ok != v.ok {
+			t.Errorf("checkNumeric(%d, %d): got %v, want %v", v.input, v.width, ok, v.ok)
+		}
+	}
+}
+
+func TestFormatNumeric(t *testing.T) {
+	var vectors = []struct {
+		input  int64
+		output string
+		ok     bool
+	}{
+		// Test base-256 (binary) encoded values.
+		{-1, "\xff", true},
+		{-1, "\xff\xff", true},
+		{-1, "\xff\xff\xff", true},
+		{(1 << 0), "0", false},
+		{(1 << 8) - 1, "\x80\xff", true},
+		{(1 << 8), "0\x00", false},
+		{(1 << 16) - 1, "\x80\xff\xff", true},
+		{(1 << 16), "00\x00", false},
+		{-1 * (1 << 0), "\xff", true},
+		{-1*(1<<0) - 1, "0", false},
+		{-1 * (1 << 8), "\xff\x00", true},
+		{-1*(1<<8) - 1, "0\x00", false},
+		{-1 * (1 << 16), "\xff\x00\x00", true},
+		{-1*(1<<16) - 1, "00\x00", false},
+		{537795476381659745, "0000000\x00", false},
+		{537795476381659745, "\x80\x00\x00\x00\x07\x76\xa2\x22\xeb\x8a\x72\x61", true},
+		{-615126028225187231, "0000000\x00", false},
+		{-615126028225187231, "\xff\xff\xff\xff\xf7\x76\xa2\x22\xeb\x8a\x72\x61", true},
+		{math.MaxInt64, "0000000\x00", false},
+		{math.MaxInt64, "\x80\x00\x00\x00\x7f\xff\xff\xff\xff\xff\xff\xff", true},
+		{math.MinInt64, "0000000\x00", false},
+		{math.MinInt64, "\xff\xff\xff\xff\x80\x00\x00\x00\x00\x00\x00\x00", true},
+		{math.MaxInt64, "\x80\x7f\xff\xff\xff\xff\xff\xff\xff", true},
+		{math.MinInt64, "\xff\x80\x00\x00\x00\x00\x00\x00\x00", true},
+	}
+
+	for _, v := range vectors {
+		var f formatter
+		output := make([]byte, len(v.output))
+		f.formatNumeric(output, v.input)
+		ok := (f.err == nil)
+		if ok != v.ok {
+			if v.ok {
+				t.Errorf("formatNumeric(%d): got formatting failure, want success", v.input)
+			} else {
+				t.Errorf("formatNumeric(%d): got formatting success, want failure", v.input)
+			}
+		}
+		if string(output) != v.output {
+			t.Errorf("formatNumeric(%d): got %q, want %q", v.input, output, v.output)
+		}
+	}
+}
+
+func TestFormatPAXTime(t *testing.T) {
+	t1 := time.Date(2000, 1, 1, 11, 0, 0, 0, time.UTC)
+	t2 := time.Date(2000, 1, 1, 11, 0, 0, 100, time.UTC)
+	t3 := time.Date(1960, 1, 1, 11, 0, 0, 0, time.UTC)
+	t4 := time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC)
+	verify := func(time time.Time, s string) {
+		p := formatPAXTime(time)
+		if p != s {
+			t.Errorf("for %v, expected %s, got %s", time, s, p)
+		}
+	}
+	verify(t1, "946724400")
+	verify(t2, "946724400.000000100")
+	verify(t3, "-315579600")
+	verify(t4, "0")
+}

vendor/github.com/Microsoft/go-winio/backup.go

@@ -0,0 +1,268 @@
+// +build windows
+
+package winio
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"runtime"
+	"syscall"
+	"unicode/utf16"
+)
+
+//sys backupRead(h syscall.Handle, b []byte, bytesRead *uint32, abort bool, processSecurity bool, context *uintptr) (err error) = BackupRead
+//sys backupWrite(h syscall.Handle, b []byte, bytesWritten *uint32, abort bool, processSecurity bool, context *uintptr) (err error) = BackupWrite
+
+const (
+	BackupData = uint32(iota + 1)
+	BackupEaData
+	BackupSecurity
+	BackupAlternateData
+	BackupLink
+	BackupPropertyData
+	BackupObjectId
+	BackupReparseData
+	BackupSparseBlock
+	BackupTxfsData
+)
+
+const (
+	StreamSparseAttributes = uint32(8)
+)
+
+const (
+	WRITE_DAC              = 0x40000
+	WRITE_OWNER            = 0x80000
+	ACCESS_SYSTEM_SECURITY = 0x1000000
+)
+
+// BackupHeader represents a backup stream of a file.
+type BackupHeader struct {
+	Id         uint32 // The backup stream ID
+	Attributes uint32 // Stream attributes
+	Size       int64  // The size of the stream in bytes
+	Name       string // The name of the stream (for BackupAlternateData only).
+	Offset     int64  // The offset of the stream in the file (for BackupSparseBlock only).
+}
+
+type win32StreamId struct {
+	StreamId   uint32
+	Attributes uint32
+	Size       uint64
+	NameSize   uint32
+}
+
+// BackupStreamReader reads from a stream produced by the BackupRead Win32 API and produces a series
+// of BackupHeader values.
+type BackupStreamReader struct {
+	r         io.Reader
+	bytesLeft int64
+}
+
+// NewBackupStreamReader produces a BackupStreamReader from any io.Reader.
+func NewBackupStreamReader(r io.Reader) *BackupStreamReader {
+	return &BackupStreamReader{r, 0}
+}
+
+// Next returns the next backup stream and prepares for calls to Write(). It skips the remainder of the current stream if
+// it was not completely read.
+func (r *BackupStreamReader) Next() (*BackupHeader, error) {
+	if r.bytesLeft > 0 {
+		if _, err := io.Copy(ioutil.Discard, r); err != nil {
+			return nil, err
+		}
+	}
+	var wsi win32StreamId
+	if err := binary.Read(r.r, binary.LittleEndian, &wsi); err != nil {
+		return nil, err
+	}
+	hdr := &BackupHeader{
+		Id:         wsi.StreamId,
+		Attributes: wsi.Attributes,
+		Size:       int64(wsi.Size),
+	}
+	if wsi.NameSize != 0 {
+		name := make([]uint16, int(wsi.NameSize/2))
+		if err := binary.Read(r.r, binary.LittleEndian, name); err != nil {
+			return nil, err
+		}
+		hdr.Name = syscall.UTF16ToString(name)
+	}
+	if wsi.StreamId == BackupSparseBlock {
+		if err := binary.Read(r.r, binary.LittleEndian, &hdr.Offset); err != nil {
+			return nil, err
+		}
+		hdr.Size -= 8
+	}
+	r.bytesLeft = hdr.Size
+	return hdr, nil
+}
+
+// Read reads from the current backup stream.
+func (r *BackupStreamReader) Read(b []byte) (int, error) {
+	if r.bytesLeft == 0 {
+		return 0, io.EOF
+	}
+	if int64(len(b)) > r.bytesLeft {
+		b = b[:r.bytesLeft]
+	}
+	n, err := r.r.Read(b)
+	r.bytesLeft -= int64(n)
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	} else if r.bytesLeft == 0 && err == nil {
+		err = io.EOF
+	}
+	return n, err
+}
+
+// BackupStreamWriter writes a stream compatible with the BackupWrite Win32 API.
+type BackupStreamWriter struct {
+	w         io.Writer
+	bytesLeft int64
+}
+
+// NewBackupStreamWriter produces a BackupStreamWriter on top of an io.Writer.
+func NewBackupStreamWriter(w io.Writer) *BackupStreamWriter {
+	return &BackupStreamWriter{w, 0}
+}
+
+// WriteHeader writes the next backup stream header and prepares for calls to Write().
+func (w *BackupStreamWriter) WriteHeader(hdr *BackupHeader) error {
+	if w.bytesLeft != 0 {
+		return fmt.Errorf("missing %d bytes", w.bytesLeft)
+	}
+	name := utf16.Encode([]rune(hdr.Name))
+	wsi := win32StreamId{
+		StreamId:   hdr.Id,
+		Attributes: hdr.Attributes,
+		Size:       uint64(hdr.Size),
+		NameSize:   uint32(len(name) * 2),
+	}
+	if hdr.Id == BackupSparseBlock {
+		// Include space for the int64 block offset
+		wsi.Size += 8
+	}
+	if err := binary.Write(w.w, binary.LittleEndian, &wsi); err != nil {
+		return err
+	}
+	if len(name) != 0 {
+		if err := binary.Write(w.w, binary.LittleEndian, name); err != nil {
+			return err
+		}
+	}
+	if hdr.Id == BackupSparseBlock {
+		if err := binary.Write(w.w, binary.LittleEndian, hdr.Offset); err != nil {
+			return err
+		}
+	}
+	w.bytesLeft = hdr.Size
+	return nil
+}
+
+// Write writes to the current backup stream.
+func (w *BackupStreamWriter) Write(b []byte) (int, error) {
+	if w.bytesLeft < int64(len(b)) {
+		return 0, fmt.Errorf("too many bytes by %d", int64(len(b))-w.bytesLeft)
+	}
+	n, err := w.w.Write(b)
+	w.bytesLeft -= int64(n)
+	return n, err
+}
+
+// BackupFileReader provides an io.ReadCloser interface on top of the BackupRead Win32 API.
+type BackupFileReader struct {
+	f               *os.File
+	includeSecurity bool
+	ctx             uintptr
+}
+
+// NewBackupFileReader returns a new BackupFileReader from a file handle. If includeSecurity is true,
+// Read will attempt to read the security descriptor of the file.
+func NewBackupFileReader(f *os.File, includeSecurity bool) *BackupFileReader {
+	r := &BackupFileReader{f, includeSecurity, 0}
+	runtime.SetFinalizer(r, func(r *BackupFileReader) { r.Close() })
+	return r
+}
+
+// Read reads a backup stream from the file by calling the Win32 API BackupRead().
+func (r *BackupFileReader) Read(b []byte) (int, error) {
+	var bytesRead uint32
+	err := backupRead(syscall.Handle(r.f.Fd()), b, &bytesRead, false, r.includeSecurity, &r.ctx)
+	if err != nil {
+		return 0, &os.PathError{"BackupRead", r.f.Name(), err}
+	}
+	if bytesRead == 0 {
+		return 0, io.EOF
+	}
+	return int(bytesRead), nil
+}
+
+// Close frees Win32 resources associated with the BackupFileReader. It does not close
+// the underlying file.
+func (r *BackupFileReader) Close() error {
+	if r.ctx != 0 {
+		backupRead(syscall.Handle(r.f.Fd()), nil, nil, true, false, &r.ctx)
+		r.ctx = 0
+	}
+	return nil
+}
+
+// BackupFileWriter provides an io.WriteCloser interface on top of the BackupWrite Win32 API.
+type BackupFileWriter struct {
+	f               *os.File
+	includeSecurity bool
+	ctx             uintptr
+}
+
+// NewBackupFileWrtier returns a new BackupFileWriter from a file handle. If includeSecurity is true,
+// Write() will attempt to restore the security descriptor from the stream.
+func NewBackupFileWriter(f *os.File, includeSecurity bool) *BackupFileWriter {
+	w := &BackupFileWriter{f, includeSecurity, 0}
+	runtime.SetFinalizer(w, func(w *BackupFileWriter) { w.Close() })
+	return w
+}
+
+// Write restores a portion of the file using the provided backup stream.
+func (w *BackupFileWriter) Write(b []byte) (int, error) {
+	var bytesWritten uint32
+	err := backupWrite(syscall.Handle(w.f.Fd()), b, &bytesWritten, false, w.includeSecurity, &w.ctx)
+	if err != nil {
+		return 0, &os.PathError{"BackupWrite", w.f.Name(), err}
+	}
+	if int(bytesWritten) != len(b) {
+		return int(bytesWritten), errors.New("not all bytes could be written")
+	}
+	return len(b), nil
+}
+
+// Close frees Win32 resources associated with the BackupFileWriter. It does not
+// close the underlying file.
+func (w *BackupFileWriter) Close() error {
+	if w.ctx != 0 {
+		backupWrite(syscall.Handle(w.f.Fd()), nil, nil, true, false, &w.ctx)
+		w.ctx = 0
+	}
+	return nil
+}
+
+// OpenForBackup opens a file or directory, potentially skipping access checks if the backup
+// or restore privileges have been acquired.
+//
+// If the file opened was a directory, it cannot be used with Readdir().
+func OpenForBackup(path string, access uint32, share uint32, createmode uint32) (*os.File, error) {
+	winPath, err := syscall.UTF16FromString(path)
+	if err != nil {
+		return nil, err
+	}
+	h, err := syscall.CreateFile(&winPath[0], access, share, nil, createmode, syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OPEN_REPARSE_POINT, 0)
+	if err != nil {
+		err = &os.PathError{Op: "open", Path: path, Err: err}
+		return nil, err
+	}
+	return os.NewFile(uintptr(h), path), nil
+}

vendor/github.com/Microsoft/go-winio/backup_test.go

@@ -0,0 +1,255 @@
+package winio
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"syscall"
+	"testing"
+)
+
+var testFileName string
+
+func TestMain(m *testing.M) {
+	f, err := ioutil.TempFile("", "tmp")
+	if err != nil {
+		panic(err)
+	}
+	testFileName = f.Name()
+	f.Close()
+	defer os.Remove(testFileName)
+	os.Exit(m.Run())
+}
+
+func makeTestFile(makeADS bool) error {
+	os.Remove(testFileName)
+	f, err := os.Create(testFileName)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = f.Write([]byte("testing 1 2 3\n"))
+	if err != nil {
+		return err
+	}
+	if makeADS {
+		a, err := os.Create(testFileName + ":ads.txt")
+		if err != nil {
+			return err
+		}
+		defer a.Close()
+		_, err = a.Write([]byte("alternate data stream\n"))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func TestBackupRead(t *testing.T) {
+	err := makeTestFile(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := os.Open(testFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	r := NewBackupFileReader(f, false)
+	defer r.Close()
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(b) == 0 {
+		t.Fatal("no data")
+	}
+}
+
+func TestBackupStreamRead(t *testing.T) {
+	err := makeTestFile(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := os.Open(testFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	r := NewBackupFileReader(f, false)
+	defer r.Close()
+
+	br := NewBackupStreamReader(r)
+	gotData := false
+	gotAltData := false
+	for {
+		hdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		switch hdr.Id {
+		case BackupData:
+			if gotData {
+				t.Fatal("duplicate data")
+			}
+			if hdr.Name != "" {
+				t.Fatalf("unexpected name %s", hdr.Name)
+			}
+			b, err := ioutil.ReadAll(br)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if string(b) != "testing 1 2 3\n" {
+				t.Fatalf("incorrect data %v", b)
+			}
+			gotData = true
+		case BackupAlternateData:
+			if gotAltData {
+				t.Fatal("duplicate alt data")
+			}
+			if hdr.Name != ":ads.txt:$DATA" {
+				t.Fatalf("incorrect name %s", hdr.Name)
+			}
+			b, err := ioutil.ReadAll(br)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if string(b) != "alternate data stream\n" {
+				t.Fatalf("incorrect data %v", b)
+			}
+			gotAltData = true
+		default:
+			t.Fatalf("unknown stream ID %d", hdr.Id)
+		}
+	}
+	if !gotData || !gotAltData {
+		t.Fatal("missing stream")
+	}
+}
+
+func TestBackupStreamWrite(t *testing.T) {
+	f, err := os.Create(testFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	w := NewBackupFileWriter(f, false)
+	defer w.Close()
+
+	data := "testing 1 2 3\n"
+	altData := "alternate stream\n"
+
+	br := NewBackupStreamWriter(w)
+	err = br.WriteHeader(&BackupHeader{Id: BackupData, Size: int64(len(data))})
+	if err != nil {
+		t.Fatal(err)
+	}
+	n, err := br.Write([]byte(data))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != len(data) {
+		t.Fatal("short write")
+	}
+
+	err = br.WriteHeader(&BackupHeader{Id: BackupAlternateData, Size: int64(len(altData)), Name: ":ads.txt:$DATA"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	n, err = br.Write([]byte(altData))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != len(altData) {
+		t.Fatal("short write")
+	}
+
+	f.Close()
+
+	b, err := ioutil.ReadFile(testFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(b) != data {
+		t.Fatalf("wrong data %v", b)
+	}
+
+	b, err = ioutil.ReadFile(testFileName + ":ads.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(b) != altData {
+		t.Fatalf("wrong data %v", b)
+	}
+}
+
+func makeSparseFile() error {
+	os.Remove(testFileName)
+	f, err := os.Create(testFileName)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	const (
+		FSCTL_SET_SPARSE    = 0x000900c4
+		FSCTL_SET_ZERO_DATA = 0x000980c8
+	)
+
+	err = syscall.DeviceIoControl(syscall.Handle(f.Fd()), FSCTL_SET_SPARSE, nil, 0, nil, 0, nil, nil)
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write([]byte("testing 1 2 3\n"))
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Seek(1000000, 0)
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write([]byte("more data later\n"))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func TestBackupSparseFile(t *testing.T) {
+	err := makeSparseFile()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := os.Open(testFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	r := NewBackupFileReader(f, false)
+	defer r.Close()
+
+	br := NewBackupStreamReader(r)
+	for {
+		hdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		t.Log(hdr)
+	}
+}

vendor/github.com/Microsoft/go-winio/backuptar/noop.go

@@ -0,0 +1,4 @@
+// +build !windows
+// This file only exists to allow go get on non-Windows platforms.
+
+package backuptar

vendor/github.com/Microsoft/go-winio/backuptar/tar.go

@@ -0,0 +1,353 @@
+// +build windows
+
+package backuptar
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Microsoft/go-winio/archive/tar" // until archive/tar supports pax extensions in its interface
+)
+
+const (
+	c_ISUID  = 04000   // Set uid
+	c_ISGID  = 02000   // Set gid
+	c_ISVTX  = 01000   // Save text (sticky bit)
+	c_ISDIR  = 040000  // Directory
+	c_ISFIFO = 010000  // FIFO
+	c_ISREG  = 0100000 // Regular file
+	c_ISLNK  = 0120000 // Symbolic link
+	c_ISBLK  = 060000  // Block special file
+	c_ISCHR  = 020000  // Character special file
+	c_ISSOCK = 0140000 // Socket
+)
+
+const (
+	hdrFileAttributes        = "fileattr"
+	hdrSecurityDescriptor    = "sd"
+	hdrRawSecurityDescriptor = "rawsd"
+	hdrMountPoint            = "mountpoint"
+)
+
+func writeZeroes(w io.Writer, count int64) error {
+	buf := make([]byte, 8192)
+	c := len(buf)
+	for i := int64(0); i < count; i += int64(c) {
+		if int64(c) > count-i {
+			c = int(count - i)
+		}
+		_, err := w.Write(buf[:c])
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func copySparse(t *tar.Writer, br *winio.BackupStreamReader) error {
+	curOffset := int64(0)
+	for {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		if err != nil {
+			return err
+		}
+		if bhdr.Id != winio.BackupSparseBlock {
+			return fmt.Errorf("unexpected stream %d", bhdr.Id)
+		}
+
+		// archive/tar does not support writing sparse files
+		// so just write zeroes to catch up to the current offset.
+		err = writeZeroes(t, bhdr.Offset-curOffset)
+		if bhdr.Size == 0 {
+			break
+		}
+		n, err := io.Copy(t, br)
+		if err != nil {
+			return err
+		}
+		curOffset = bhdr.Offset + n
+	}
+	return nil
+}
+
+// BasicInfoHeader creates a tar header from basic file information.
+func BasicInfoHeader(name string, size int64, fileInfo *winio.FileBasicInfo) *tar.Header {
+	hdr := &tar.Header{
+		Name:         filepath.ToSlash(name),
+		Size:         size,
+		Typeflag:     tar.TypeReg,
+		ModTime:      time.Unix(0, fileInfo.LastWriteTime.Nanoseconds()),
+		ChangeTime:   time.Unix(0, fileInfo.ChangeTime.Nanoseconds()),
+		AccessTime:   time.Unix(0, fileInfo.LastAccessTime.Nanoseconds()),
+		CreationTime: time.Unix(0, fileInfo.CreationTime.Nanoseconds()),
+		Winheaders:   make(map[string]string),
+	}
+	hdr.Winheaders[hdrFileAttributes] = fmt.Sprintf("%d", fileInfo.FileAttributes)
+
+	if (fileInfo.FileAttributes & syscall.FILE_ATTRIBUTE_DIRECTORY) != 0 {
+		hdr.Mode |= c_ISDIR
+		hdr.Size = 0
+		hdr.Typeflag = tar.TypeDir
+	}
+	return hdr
+}
+
+// WriteTarFileFromBackupStream writes a file to a tar writer using data from a Win32 backup stream.
+//
+// This encodes Win32 metadata as tar pax vendor extensions starting with MSWINDOWS.
+//
+// The additional Win32 metadata is:
+//
+// MSWINDOWS.fileattr: The Win32 file attributes, as a decimal value
+//
+// MSWINDOWS.rawsd: The Win32 security descriptor, in raw binary format
+//
+// MSWINDOWS.mountpoint: If present, this is a mount point and not a symlink, even though the type is '2' (symlink)
+func WriteTarFileFromBackupStream(t *tar.Writer, r io.Reader, name string, size int64, fileInfo *winio.FileBasicInfo) error {
+	name = filepath.ToSlash(name)
+	hdr := BasicInfoHeader(name, size, fileInfo)
+	br := winio.NewBackupStreamReader(r)
+	var dataHdr *winio.BackupHeader
+	for dataHdr == nil {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		switch bhdr.Id {
+		case winio.BackupData:
+			hdr.Mode |= c_ISREG
+			dataHdr = bhdr
+		case winio.BackupSecurity:
+			sd, err := ioutil.ReadAll(br)
+			if err != nil {
+				return err
+			}
+			hdr.Winheaders[hdrRawSecurityDescriptor] = base64.StdEncoding.EncodeToString(sd)
+
+		case winio.BackupReparseData:
+			hdr.Mode |= c_ISLNK
+			hdr.Typeflag = tar.TypeSymlink
+			reparseBuffer, err := ioutil.ReadAll(br)
+			rp, err := winio.DecodeReparsePoint(reparseBuffer)
+			if err != nil {
+				return err
+			}
+			if rp.IsMountPoint {
+				hdr.Winheaders[hdrMountPoint] = "1"
+			}
+			hdr.Linkname = rp.Target
+		case winio.BackupEaData, winio.BackupLink, winio.BackupPropertyData, winio.BackupObjectId, winio.BackupTxfsData:
+			// ignore these streams
+		default:
+			return fmt.Errorf("%s: unknown stream ID %d", name, bhdr.Id)
+		}
+	}
+
+	err := t.WriteHeader(hdr)
+	if err != nil {
+		return err
+	}
+
+	if dataHdr != nil {
+		// A data stream was found. Copy the data.
+		if (dataHdr.Attributes & winio.StreamSparseAttributes) == 0 {
+			if size != dataHdr.Size {
+				return fmt.Errorf("%s: mismatch between file size %d and header size %d", name, size, dataHdr.Size)
+			}
+			_, err = io.Copy(t, br)
+			if err != nil {
+				return err
+			}
+		} else {
+			err = copySparse(t, br)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	// Look for streams after the data stream. The only ones we handle are alternate data streams.
+	// Other streams may have metadata that could be serialized, but the tar header has already
+	// been written. In practice, this means that we don't get EA or TXF metadata.
+	for {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		switch bhdr.Id {
+		case winio.BackupAlternateData:
+			altName := bhdr.Name
+			if strings.HasSuffix(altName, ":$DATA") {
+				altName = altName[:len(altName)-len(":$DATA")]
+			}
+			if (bhdr.Attributes & winio.StreamSparseAttributes) == 0 {
+				hdr = &tar.Header{
+					Name:       name + altName,
+					Mode:       hdr.Mode,
+					Typeflag:   tar.TypeReg,
+					Size:       bhdr.Size,
+					ModTime:    hdr.ModTime,
+					AccessTime: hdr.AccessTime,
+					ChangeTime: hdr.ChangeTime,
+				}
+				err = t.WriteHeader(hdr)
+				if err != nil {
+					return err
+				}
+				_, err = io.Copy(t, br)
+				if err != nil {
+					return err
+				}
+
+			} else {
+				// Unsupported for now, since the size of the alternate stream is not present
+				// in the backup stream until after the data has been read.
+				return errors.New("tar of sparse alternate data streams is unsupported")
+			}
+		case winio.BackupEaData, winio.BackupLink, winio.BackupPropertyData, winio.BackupObjectId, winio.BackupTxfsData:
+			// ignore these streams
+		default:
+			return fmt.Errorf("%s: unknown stream ID %d after data", name, bhdr.Id)
+		}
+	}
+	return nil
+}
+
+// FileInfoFromHeader retrieves basic Win32 file information from a tar header, using the additional metadata written by
+// WriteTarFileFromBackupStream.
+func FileInfoFromHeader(hdr *tar.Header) (name string, size int64, fileInfo *winio.FileBasicInfo, err error) {
+	name = hdr.Name
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		size = hdr.Size
+	}
+	fileInfo = &winio.FileBasicInfo{
+		LastAccessTime: syscall.NsecToFiletime(hdr.AccessTime.UnixNano()),
+		LastWriteTime:  syscall.NsecToFiletime(hdr.ModTime.UnixNano()),
+		ChangeTime:     syscall.NsecToFiletime(hdr.ChangeTime.UnixNano()),
+		CreationTime:   syscall.NsecToFiletime(hdr.CreationTime.UnixNano()),
+	}
+	if attrStr, ok := hdr.Winheaders[hdrFileAttributes]; ok {
+		attr, err := strconv.ParseUint(attrStr, 10, 32)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		fileInfo.FileAttributes = uintptr(attr)
+	} else {
+		if hdr.Typeflag == tar.TypeDir {
+			fileInfo.FileAttributes |= syscall.FILE_ATTRIBUTE_DIRECTORY
+		}
+	}
+	return
+}
+
+// WriteBackupStreamFromTarFile writes a Win32 backup stream from the current tar file. Since this function may process multiple
+// tar file entries in order to collect all the alternate data streams for the file, it returns the next
+// tar file that was not processed, or io.EOF is there are no more.
+func WriteBackupStreamFromTarFile(w io.Writer, t *tar.Reader, hdr *tar.Header) (*tar.Header, error) {
+	bw := winio.NewBackupStreamWriter(w)
+	var sd []byte
+	var err error
+	// Maintaining old SDDL-based behavior for backward compatibility.  All new tar headers written
+	// by this library will have raw binary for the security descriptor.
+	if sddl, ok := hdr.Winheaders[hdrSecurityDescriptor]; ok {
+		sd, err = winio.SddlToSecurityDescriptor(sddl)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if sdraw, ok := hdr.Winheaders[hdrRawSecurityDescriptor]; ok {
+		sd, err = base64.StdEncoding.DecodeString(sdraw)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if len(sd) != 0 {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupSecurity,
+			Size: int64(len(sd)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(sd)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeSymlink {
+		_, isMountPoint := hdr.Winheaders[hdrMountPoint]
+		rp := winio.ReparsePoint{
+			Target:       filepath.FromSlash(hdr.Linkname),
+			IsMountPoint: isMountPoint,
+		}
+		reparse := winio.EncodeReparsePoint(&rp)
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupReparseData,
+			Size: int64(len(reparse)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(reparse)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupData,
+			Size: hdr.Size,
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// Copy all the alternate data streams and return the next non-ADS header.
+	for {
+		ahdr, err := t.Next()
+		if err != nil {
+			return nil, err
+		}
+		if ahdr.Typeflag != tar.TypeReg || !strings.HasPrefix(ahdr.Name, hdr.Name+":") {
+			return ahdr, nil
+		}
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupAlternateData,
+			Size: ahdr.Size,
+			Name: ahdr.Name[len(hdr.Name)+1:] + ":$DATA",
+		}
+		err = bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+}

vendor/github.com/Microsoft/go-winio/backuptar/tar_test.go

@@ -0,0 +1,84 @@
+package backuptar
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Microsoft/go-winio/archive/tar"
+)
+
+func ensurePresent(t *testing.T, m map[string]string, keys ...string) {
+	for _, k := range keys {
+		if _, ok := m[k]; !ok {
+			t.Error(k, "not present in tar header")
+		}
+	}
+}
+
+func TestRoundTrip(t *testing.T) {
+	f, err := ioutil.TempFile("", "tst")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	defer os.Remove(f.Name())
+
+	if _, err = f.Write([]byte("testing 1 2 3\n")); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err = f.Seek(0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	fi, err := f.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bi, err := winio.GetFileBasicInfo(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	br := winio.NewBackupFileReader(f, true)
+	defer br.Close()
+
+	var buf bytes.Buffer
+	tw := tar.NewWriter(&buf)
+
+	err = WriteTarFileFromBackupStream(tw, br, f.Name(), fi.Size(), bi)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tr := tar.NewReader(&buf)
+	hdr, err := tr.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	name, size, bi2, err := FileInfoFromHeader(hdr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if name != filepath.ToSlash(f.Name()) {
+		t.Errorf("got name %s, expected %s", name, filepath.ToSlash(f.Name()))
+	}
+
+	if size != fi.Size() {
+		t.Errorf("got size %d, expected %d", size, fi.Size())
+	}
+
+	if !reflect.DeepEqual(*bi, *bi2) {
+		t.Errorf("got %#v, expected %#v", *bi, *bi2)
+	}
+
+	ensurePresent(t, hdr.Winheaders, "fileattr", "sd")
+}

vendor/github.com/Microsoft/go-winio/file.go

@@ -0,0 +1,221 @@
+// +build windows
+
+package winio
+
+import (
+	"errors"
+	"io"
+	"runtime"
+	"sync"
+	"syscall"
+	"time"
+)
+
+//sys cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) = CancelIoEx
+//sys createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintptr, threadCount uint32) (newport syscall.Handle, err error) = CreateIoCompletionPort
+//sys getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) = GetQueuedCompletionStatus
+//sys setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err error) = SetFileCompletionNotificationModes
+//sys timeBeginPeriod(period uint32) (n int32) = winmm.timeBeginPeriod
+
+const (
+	cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS = 1
+	cFILE_SKIP_SET_EVENT_ON_HANDLE        = 2
+)
+
+var (
+	ErrFileClosed = errors.New("file has already been closed")
+	ErrTimeout    = &timeoutError{}
+)
+
+type timeoutError struct{}
+
+func (e *timeoutError) Error() string   { return "i/o timeout" }
+func (e *timeoutError) Timeout() bool   { return true }
+func (e *timeoutError) Temporary() bool { return true }
+
+var ioInitOnce sync.Once
+var ioCompletionPort syscall.Handle
+
+// ioResult contains the result of an asynchronous IO operation
+type ioResult struct {
+	bytes uint32
+	err   error
+}
+
+// ioOperation represents an outstanding asynchronous Win32 IO
+type ioOperation struct {
+	o  syscall.Overlapped
+	ch chan ioResult
+}
+
+func initIo() {
+	h, err := createIoCompletionPort(syscall.InvalidHandle, 0, 0, 0xffffffff)
+	if err != nil {
+		panic(err)
+	}
+	ioCompletionPort = h
+	go ioCompletionProcessor(h)
+}
+
+// win32File implements Reader, Writer, and Closer on a Win32 handle without blocking in a syscall.
+// It takes ownership of this handle and will close it if it is garbage collected.
+type win32File struct {
+	handle        syscall.Handle
+	wg            sync.WaitGroup
+	closing       bool
+	readDeadline  time.Time
+	writeDeadline time.Time
+}
+
+// makeWin32File makes a new win32File from an existing file handle
+func makeWin32File(h syscall.Handle) (*win32File, error) {
+	f := &win32File{handle: h}
+	ioInitOnce.Do(initIo)
+	_, err := createIoCompletionPort(h, ioCompletionPort, 0, 0xffffffff)
+	if err != nil {
+		return nil, err
+	}
+	err = setFileCompletionNotificationModes(h, cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS|cFILE_SKIP_SET_EVENT_ON_HANDLE)
+	if err != nil {
+		return nil, err
+	}
+	runtime.SetFinalizer(f, (*win32File).closeHandle)
+	return f, nil
+}
+
+func MakeOpenFile(h syscall.Handle) (io.ReadWriteCloser, error) {
+	return makeWin32File(h)
+}
+
+// closeHandle closes the resources associated with a Win32 handle
+func (f *win32File) closeHandle() {
+	if !f.closing {
+		// cancel all IO and wait for it to complete
+		f.closing = true
+		cancelIoEx(f.handle, nil)
+		f.wg.Wait()
+		// at this point, no new IO can start
+		syscall.Close(f.handle)
+		f.handle = 0
+	}
+}
+
+// Close closes a win32File.
+func (f *win32File) Close() error {
+	f.closeHandle()
+	runtime.SetFinalizer(f, nil)
+	return nil
+}
+
+// prepareIo prepares for a new IO operation
+func (f *win32File) prepareIo() (*ioOperation, error) {
+	f.wg.Add(1)
+	if f.closing {
+		return nil, ErrFileClosed
+	}
+	c := &ioOperation{}
+	c.ch = make(chan ioResult)
+	return c, nil
+}
+
+// ioCompletionProcessor processes completed async IOs forever
+func ioCompletionProcessor(h syscall.Handle) {
+	// Set the timer resolution to 1. This fixes a performance regression in golang 1.6.
+	timeBeginPeriod(1)
+	for {
+		var bytes uint32
+		var key uintptr
+		var op *ioOperation
+		err := getQueuedCompletionStatus(h, &bytes, &key, &op, syscall.INFINITE)
+		if op == nil {
+			panic(err)
+		}
+		op.ch <- ioResult{bytes, err}
+	}
+}
+
+// asyncIo processes the return value from ReadFile or WriteFile, blocking until
+// the operation has actually completed.
+func (f *win32File) asyncIo(c *ioOperation, deadline time.Time, bytes uint32, err error) (int, error) {
+	if err != syscall.ERROR_IO_PENDING {
+		f.wg.Done()
+		return int(bytes), err
+	} else {
+		var r ioResult
+		wait := true
+		timedout := false
+		if f.closing {
+			cancelIoEx(f.handle, &c.o)
+		} else if !deadline.IsZero() {
+			now := time.Now()
+			if !deadline.After(now) {
+				timedout = true
+			} else {
+				timeout := time.After(deadline.Sub(now))
+				select {
+				case r = <-c.ch:
+					wait = false
+				case <-timeout:
+					timedout = true
+				}
+			}
+		}
+		if timedout {
+			cancelIoEx(f.handle, &c.o)
+		}
+		if wait {
+			r = <-c.ch
+		}
+		err = r.err
+		if err == syscall.ERROR_OPERATION_ABORTED {
+			if f.closing {
+				err = ErrFileClosed
+			} else if timedout {
+				err = ErrTimeout
+			}
+		}
+		f.wg.Done()
+		return int(r.bytes), err
+	}
+}
+
+// Read reads from a file handle.
+func (f *win32File) Read(b []byte) (int, error) {
+	c, err := f.prepareIo()
+	if err != nil {
+		return 0, err
+	}
+	var bytes uint32
+	err = syscall.ReadFile(f.handle, b, &bytes, &c.o)
+	n, err := f.asyncIo(c, f.readDeadline, bytes, err)
+
+	// Handle EOF conditions.
+	if err == nil && n == 0 && len(b) != 0 {
+		return 0, io.EOF
+	} else if err == syscall.ERROR_BROKEN_PIPE {
+		return 0, io.EOF
+	} else {
+		return n, err
+	}
+}
+
+// Write writes to a file handle.
+func (f *win32File) Write(b []byte) (int, error) {
+	c, err := f.prepareIo()
+	if err != nil {
+		return 0, err
+	}
+	var bytes uint32
+	err = syscall.WriteFile(f.handle, b, &bytes, &c.o)
+	return f.asyncIo(c, f.writeDeadline, bytes, err)
+}
+
+func (f *win32File) SetReadDeadline(t time.Time) error {
+	f.readDeadline = t
+	return nil
+}
+
+func (f *win32File) SetWriteDeadline(t time.Time) error {
+	f.writeDeadline = t
+	return nil
+}

vendor/github.com/Microsoft/go-winio/fileinfo.go

@@ -0,0 +1,56 @@
+// +build windows
+
+package winio
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+//sys getFileInformationByHandleEx(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) = GetFileInformationByHandleEx
+//sys setFileInformationByHandle(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) = SetFileInformationByHandle
+
+const (
+	fileBasicInfo = 0
+	fileIDInfo    = 0x12
+)
+
+// FileBasicInfo contains file access time and file attributes information.
+type FileBasicInfo struct {
+	CreationTime, LastAccessTime, LastWriteTime, ChangeTime syscall.Filetime
+	FileAttributes                                          uintptr // includes padding
+}
+
+// GetFileBasicInfo retrieves times and attributes for a file.
+func GetFileBasicInfo(f *os.File) (*FileBasicInfo, error) {
+	bi := &FileBasicInfo{}
+	if err := getFileInformationByHandleEx(syscall.Handle(f.Fd()), fileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
+		return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
+	}
+	return bi, nil
+}
+
+// SetFileBasicInfo sets times and attributes for a file.
+func SetFileBasicInfo(f *os.File, bi *FileBasicInfo) error {
+	if err := setFileInformationByHandle(syscall.Handle(f.Fd()), fileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
+		return &os.PathError{Op: "SetFileInformationByHandle", Path: f.Name(), Err: err}
+	}
+	return nil
+}
+
+// FileIDInfo contains the volume serial number and file ID for a file. This pair should be
+// unique on a system.
+type FileIDInfo struct {
+	VolumeSerialNumber uint64
+	FileID             [16]byte
+}
+
+// GetFileID retrieves the unique (volume, file ID) pair for a file.
+func GetFileID(f *os.File) (*FileIDInfo, error) {
+	fileID := &FileIDInfo{}
+	if err := getFileInformationByHandleEx(syscall.Handle(f.Fd()), fileIDInfo, (*byte)(unsafe.Pointer(fileID)), uint32(unsafe.Sizeof(*fileID))); err != nil {
+		return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
+	}
+	return fileID, nil
+}

vendor/github.com/Microsoft/go-winio/pipe.go

@@ -0,0 +1,400 @@
+// +build windows
+
+package winio
+
+import (
+	"errors"
+	"io"
+	"net"
+	"os"
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+//sys connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) = ConnectNamedPipe
+//sys createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *securityAttributes) (handle syscall.Handle, err error)  [failretval==syscall.InvalidHandle] = CreateNamedPipeW
+//sys createFile(name string, access uint32, mode uint32, sa *securityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) [failretval==syscall.InvalidHandle] = CreateFileW
+//sys waitNamedPipe(name string, timeout uint32) (err error) = WaitNamedPipeW
+//sys getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
+//sys getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
+
+type securityAttributes struct {
+	Length             uint32
+	SecurityDescriptor *byte
+	InheritHandle      uint32
+}
+
+const (
+	cERROR_PIPE_BUSY      = syscall.Errno(231)
+	cERROR_PIPE_CONNECTED = syscall.Errno(535)
+	cERROR_SEM_TIMEOUT    = syscall.Errno(121)
+
+	cPIPE_ACCESS_DUPLEX            = 0x3
+	cFILE_FLAG_FIRST_PIPE_INSTANCE = 0x80000
+	cSECURITY_SQOS_PRESENT         = 0x100000
+	cSECURITY_ANONYMOUS            = 0
+
+	cPIPE_REJECT_REMOTE_CLIENTS = 0x8
+
+	cPIPE_UNLIMITED_INSTANCES = 255
+
+	cNMPWAIT_USE_DEFAULT_WAIT = 0
+	cNMPWAIT_NOWAIT           = 1
+
+	cPIPE_TYPE_MESSAGE = 4
+
+	cPIPE_READMODE_MESSAGE = 2
+)
+
+var (
+	// ErrPipeListenerClosed is returned for pipe operations on listeners that have been closed.
+	// This error should match net.errClosing since docker takes a dependency on its text.
+	ErrPipeListenerClosed = errors.New("use of closed network connection")
+
+	errPipeWriteClosed = errors.New("pipe has been closed for write")
+)
+
+type win32Pipe struct {
+	*win32File
+	path string
+}
+
+type win32MessageBytePipe struct {
+	win32Pipe
+	writeClosed bool
+	readEOF     bool
+}
+
+type pipeAddress string
+
+func (f *win32Pipe) LocalAddr() net.Addr {
+	return pipeAddress(f.path)
+}
+
+func (f *win32Pipe) RemoteAddr() net.Addr {
+	return pipeAddress(f.path)
+}
+
+func (f *win32Pipe) SetDeadline(t time.Time) error {
+	f.SetReadDeadline(t)
+	f.SetWriteDeadline(t)
+	return nil
+}
+
+// CloseWrite closes the write side of a message pipe in byte mode.
+func (f *win32MessageBytePipe) CloseWrite() error {
+	if f.writeClosed {
+		return errPipeWriteClosed
+	}
+	_, err := f.win32File.Write(nil)
+	if err != nil {
+		return err
+	}
+	f.writeClosed = true
+	return nil
+}
+
+// Write writes bytes to a message pipe in byte mode. Zero-byte writes are ignored, since
+// they are used to implement CloseWrite().
+func (f *win32MessageBytePipe) Write(b []byte) (int, error) {
+	if f.writeClosed {
+		return 0, errPipeWriteClosed
+	}
+	if len(b) == 0 {
+		return 0, nil
+	}
+	return f.win32File.Write(b)
+}
+
+// Read reads bytes from a message pipe in byte mode. A read of a zero-byte message on a message
+// mode pipe will return io.EOF, as will all subsequent reads.
+func (f *win32MessageBytePipe) Read(b []byte) (int, error) {
+	if f.readEOF {
+		return 0, io.EOF
+	}
+	n, err := f.win32File.Read(b)
+	if err == io.EOF {
+		// If this was the result of a zero-byte read, then
+		// it is possible that the read was due to a zero-size
+		// message. Since we are simulating CloseWrite with a
+		// zero-byte message, ensure that all future Read() calls
+		// also return EOF.
+		f.readEOF = true
+	}
+	return n, err
+}
+
+func (s pipeAddress) Network() string {
+	return "pipe"
+}
+
+func (s pipeAddress) String() string {
+	return string(s)
+}
+
+// DialPipe connects to a named pipe by path, timing out if the connection
+// takes longer than the specified duration. If timeout is nil, then the timeout
+// is the default timeout established by the pipe server.
+func DialPipe(path string, timeout *time.Duration) (net.Conn, error) {
+	var absTimeout time.Time
+	if timeout != nil {
+		absTimeout = time.Now().Add(*timeout)
+	}
+	var err error
+	var h syscall.Handle
+	for {
+		h, err = createFile(path, syscall.GENERIC_READ|syscall.GENERIC_WRITE, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_OVERLAPPED|cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
+		if err != cERROR_PIPE_BUSY {
+			break
+		}
+		now := time.Now()
+		var ms uint32
+		if absTimeout.IsZero() {
+			ms = cNMPWAIT_USE_DEFAULT_WAIT
+		} else if now.After(absTimeout) {
+			ms = cNMPWAIT_NOWAIT
+		} else {
+			ms = uint32(absTimeout.Sub(now).Nanoseconds() / 1000 / 1000)
+		}
+		err = waitNamedPipe(path, ms)
+		if err != nil {
+			if err == cERROR_SEM_TIMEOUT {
+				return nil, ErrTimeout
+			}
+			break
+		}
+	}
+	if err != nil {
+		return nil, &os.PathError{Op: "open", Path: path, Err: err}
+	}
+
+	var flags uint32
+	err = getNamedPipeInfo(h, &flags, nil, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var state uint32
+	err = getNamedPipeHandleState(h, &state, nil, nil, nil, nil, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	if state&cPIPE_READMODE_MESSAGE != 0 {
+		return nil, &os.PathError{Op: "open", Path: path, Err: errors.New("message readmode pipes not supported")}
+	}
+
+	f, err := makeWin32File(h)
+	if err != nil {
+		syscall.Close(h)
+		return nil, err
+	}
+
+	// If the pipe is in message mode, return a message byte pipe, which
+	// supports CloseWrite().
+	if flags&cPIPE_TYPE_MESSAGE != 0 {
+		return &win32MessageBytePipe{
+			win32Pipe: win32Pipe{win32File: f, path: path},
+		}, nil
+	}
+	return &win32Pipe{win32File: f, path: path}, nil
+}
+
+type acceptResponse struct {
+	f   *win32File
+	err error
+}
+
+type win32PipeListener struct {
+	firstHandle        syscall.Handle
+	path               string
+	securityDescriptor []byte
+	config             PipeConfig
+	acceptCh           chan (chan acceptResponse)
+	closeCh            chan int
+	doneCh             chan int
+}
+
+func makeServerPipeHandle(path string, securityDescriptor []byte, c *PipeConfig, first bool) (syscall.Handle, error) {
+	var flags uint32 = cPIPE_ACCESS_DUPLEX | syscall.FILE_FLAG_OVERLAPPED
+	if first {
+		flags |= cFILE_FLAG_FIRST_PIPE_INSTANCE
+	}
+
+	var mode uint32 = cPIPE_REJECT_REMOTE_CLIENTS
+	if c.MessageMode {
+		mode |= cPIPE_TYPE_MESSAGE
+	}
+
+	var sa securityAttributes
+	sa.Length = uint32(unsafe.Sizeof(sa))
+	if securityDescriptor != nil {
+		sa.SecurityDescriptor = &securityDescriptor[0]
+	}
+	h, err := createNamedPipe(path, flags, mode, cPIPE_UNLIMITED_INSTANCES, uint32(c.OutputBufferSize), uint32(c.InputBufferSize), 0, &sa)
+	if err != nil {
+		return 0, &os.PathError{Op: "open", Path: path, Err: err}
+	}
+	return h, nil
+}
+
+func (l *win32PipeListener) makeServerPipe() (*win32File, error) {
+	h, err := makeServerPipeHandle(l.path, l.securityDescriptor, &l.config, false)
+	if err != nil {
+		return nil, err
+	}
+	f, err := makeWin32File(h)
+	if err != nil {
+		syscall.Close(h)
+		return nil, err
+	}
+	return f, nil
+}
+
+func (l *win32PipeListener) listenerRoutine() {
+	closed := false
+	for !closed {
+		select {
+		case <-l.closeCh:
+			closed = true
+		case responseCh := <-l.acceptCh:
+			p, err := l.makeServerPipe()
+			if err == nil {
+				// Wait for the client to connect.
+				ch := make(chan error)
+				go func() {
+					ch <- connectPipe(p)
+				}()
+				select {
+				case err = <-ch:
+					if err != nil {
+						p.Close()
+						p = nil
+					}
+				case <-l.closeCh:
+					// Abort the connect request by closing the handle.
+					p.Close()
+					p = nil
+					err = <-ch
+					if err == nil || err == ErrFileClosed {
+						err = ErrPipeListenerClosed
+					}
+					closed = true
+				}
+			}
+			responseCh <- acceptResponse{p, err}
+		}
+	}
+	syscall.Close(l.firstHandle)
+	l.firstHandle = 0
+	// Notify Close() and Accept() callers that the handle has been closed.
+	close(l.doneCh)
+}
+
+// PipeConfig contain configuration for the pipe listener.
+type PipeConfig struct {
+	// SecurityDescriptor contains a Windows security descriptor in SDDL format.
+	SecurityDescriptor string
+
+	// MessageMode determines whether the pipe is in byte or message mode. In either
+	// case the pipe is read in byte mode by default. The only practical difference in
+	// this implementation is that CloseWrite() is only supported for message mode pipes;
+	// CloseWrite() is implemented as a zero-byte write, but zero-byte writes are only
+	// transferred to the reader (and returned as io.EOF in this implementation)
+	// when the pipe is in message mode.
+	MessageMode bool
+
+	// InputBufferSize specifies the size the input buffer, in bytes.
+	InputBufferSize int32
+
+	// OutputBufferSize specifies the size the input buffer, in bytes.
+	OutputBufferSize int32
+}
+
+// ListenPipe creates a listener on a Windows named pipe path, e.g. \\.\pipe\mypipe.
+// The pipe must not already exist.
+func ListenPipe(path string, c *PipeConfig) (net.Listener, error) {
+	var (
+		sd  []byte
+		err error
+	)
+	if c == nil {
+		c = &PipeConfig{}
+	}
+	if c.SecurityDescriptor != "" {
+		sd, err = SddlToSecurityDescriptor(c.SecurityDescriptor)
+		if err != nil {
+			return nil, err
+		}
+	}
+	h, err := makeServerPipeHandle(path, sd, c, true)
+	if err != nil {
+		return nil, err
+	}
+	// Immediately open and then close a client handle so that the named pipe is
+	// created but not currently accepting connections.
+	h2, err := createFile(path, 0, 0, nil, syscall.OPEN_EXISTING, cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
+	if err != nil {
+		syscall.Close(h)
+		return nil, err
+	}
+	syscall.Close(h2)
+	l := &win32PipeListener{
+		firstHandle:        h,
+		path:               path,
+		securityDescriptor: sd,
+		config:             *c,
+		acceptCh:           make(chan (chan acceptResponse)),
+		closeCh:            make(chan int),
+		doneCh:             make(chan int),
+	}
+	go l.listenerRoutine()
+	return l, nil
+}
+
+func connectPipe(p *win32File) error {
+	c, err := p.prepareIo()
+	if err != nil {
+		return err
+	}
+	err = connectNamedPipe(p.handle, &c.o)
+	_, err = p.asyncIo(c, time.Time{}, 0, err)
+	if err != nil && err != cERROR_PIPE_CONNECTED {
+		return err
+	}
+	return nil
+}
+
+func (l *win32PipeListener) Accept() (net.Conn, error) {
+	ch := make(chan acceptResponse)
+	select {
+	case l.acceptCh <- ch:
+		response := <-ch
+		err := response.err
+		if err != nil {
+			return nil, err
+		}
+		if l.config.MessageMode {
+			return &win32MessageBytePipe{
+				win32Pipe: win32Pipe{win32File: response.f, path: l.path},
+			}, nil
+		}
+		return &win32Pipe{win32File: response.f, path: l.path}, nil
+	case <-l.doneCh:
+		return nil, ErrPipeListenerClosed
+	}
+}
+
+func (l *win32PipeListener) Close() error {
+	select {
+	case l.closeCh <- 1:
+		<-l.doneCh
+	case <-l.doneCh:
+	}
+	return nil
+}
+
+func (l *win32PipeListener) Addr() net.Addr {
+	return pipeAddress(l.path)
+}

vendor/github.com/Microsoft/go-winio/pipe_test.go

@@ -0,0 +1,262 @@
+package winio
+
+import (
+	"bufio"
+	"io"
+	"net"
+	"os"
+	"syscall"
+	"testing"
+	"time"
+)
+
+var testPipeName = `\\.\pipe\winiotestpipe`
+
+func TestDialUnknownFailsImmediately(t *testing.T) {
+	_, err := DialPipe(testPipeName, nil)
+	if err.(*os.PathError).Err != syscall.ENOENT {
+		t.Fatalf("expected ENOENT got %v", err)
+	}
+}
+
+func TestDialListenerTimesOut(t *testing.T) {
+	l, err := ListenPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+	var d = time.Duration(10 * time.Millisecond)
+	_, err = DialPipe(testPipeName, &d)
+	if err != ErrTimeout {
+		t.Fatalf("expected ErrTimeout, got %v", err)
+	}
+}
+
+func TestDialAccessDeniedWithRestrictedSD(t *testing.T) {
+	c := PipeConfig{
+		SecurityDescriptor: "D:P(A;;0x1200FF;;;WD)",
+	}
+	l, err := ListenPipe(testPipeName, &c)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+	_, err = DialPipe(testPipeName, nil)
+	if err.(*os.PathError).Err != syscall.ERROR_ACCESS_DENIED {
+		t.Fatalf("expected ERROR_ACCESS_DENIED, got %v", err)
+	}
+}
+
+func getConnection(cfg *PipeConfig) (client net.Conn, server net.Conn, err error) {
+	l, err := ListenPipe(testPipeName, cfg)
+	if err != nil {
+		return
+	}
+	defer l.Close()
+
+	type response struct {
+		c   net.Conn
+		err error
+	}
+	ch := make(chan response)
+	go func() {
+		c, err := l.Accept()
+		ch <- response{c, err}
+	}()
+
+	c, err := DialPipe(testPipeName, nil)
+	if err != nil {
+		return
+	}
+
+	r := <-ch
+	if err = r.err; err != nil {
+		c.Close()
+		return
+	}
+
+	client = c
+	server = r.c
+	return
+}
+
+func TestReadTimeout(t *testing.T) {
+	c, s, err := getConnection(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	defer s.Close()
+
+	c.SetReadDeadline(time.Now().Add(10 * time.Millisecond))
+
+	buf := make([]byte, 10)
+	_, err = c.Read(buf)
+	if err != ErrTimeout {
+		t.Fatalf("expected ErrTimeout, got %v", err)
+	}
+}
+
+func server(l net.Listener, ch chan int) {
+	c, err := l.Accept()
+	if err != nil {
+		panic(err)
+	}
+	rw := bufio.NewReadWriter(bufio.NewReader(c), bufio.NewWriter(c))
+	s, err := rw.ReadString('\n')
+	if err != nil {
+		panic(err)
+	}
+	_, err = rw.WriteString("got " + s)
+	if err != nil {
+		panic(err)
+	}
+	err = rw.Flush()
+	if err != nil {
+		panic(err)
+	}
+	c.Close()
+	ch <- 1
+}
+
+func TestFullListenDialReadWrite(t *testing.T) {
+	l, err := ListenPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+
+	ch := make(chan int)
+	go server(l, ch)
+
+	c, err := DialPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+
+	rw := bufio.NewReadWriter(bufio.NewReader(c), bufio.NewWriter(c))
+	_, err = rw.WriteString("hello world\n")
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = rw.Flush()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s, err := rw.ReadString('\n')
+	if err != nil {
+		t.Fatal(err)
+	}
+	ms := "got hello world\n"
+	if s != ms {
+		t.Errorf("expected '%s', got '%s'", ms, s)
+	}
+
+	<-ch
+}
+
+func TestCloseAbortsListen(t *testing.T) {
+	l, err := ListenPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ch := make(chan error)
+	go func() {
+		_, err := l.Accept()
+		ch <- err
+	}()
+
+	time.Sleep(30 * time.Millisecond)
+	l.Close()
+
+	err = <-ch
+	if err != ErrPipeListenerClosed {
+		t.Fatalf("expected ErrPipeListenerClosed, got %v", err)
+	}
+}
+
+func ensureEOFOnClose(t *testing.T, r io.Reader, w io.Closer) {
+	b := make([]byte, 10)
+	w.Close()
+	n, err := r.Read(b)
+	if n > 0 {
+		t.Errorf("unexpected byte count %d", n)
+	}
+	if err != io.EOF {
+		t.Errorf("expected EOF: %v", err)
+	}
+}
+
+func TestCloseClientEOFServer(t *testing.T) {
+	c, s, err := getConnection(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	defer s.Close()
+	ensureEOFOnClose(t, c, s)
+}
+
+func TestCloseServerEOFClient(t *testing.T) {
+	c, s, err := getConnection(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	defer s.Close()
+	ensureEOFOnClose(t, s, c)
+}
+
+func TestCloseWriteEOF(t *testing.T) {
+	cfg := &PipeConfig{
+		MessageMode: true,
+	}
+	c, s, err := getConnection(cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	defer s.Close()
+
+	type closeWriter interface {
+		CloseWrite() error
+	}
+
+	err = c.(closeWriter).CloseWrite()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	b := make([]byte, 10)
+	_, err = s.Read(b)
+	if err != io.EOF {
+		t.Fatal(err)
+	}
+}
+
+func TestAcceptAfterCloseFails(t *testing.T) {
+	l, err := ListenPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	l.Close()
+	_, err = l.Accept()
+	if err != ErrPipeListenerClosed {
+		t.Fatalf("expected ErrPipeListenerClosed, got %v", err)
+	}
+}
+
+func TestDialTimesOutByDefault(t *testing.T) {
+	l, err := ListenPipe(testPipeName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+	_, err = DialPipe(testPipeName, nil)
+	if err != ErrTimeout {
+		t.Fatalf("expected ErrTimeout, got %v", err)
+	}
+}

vendor/github.com/Microsoft/go-winio/privilege.go

@@ -0,0 +1,202 @@
+// +build windows
+
+package winio
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"runtime"
+	"sync"
+	"syscall"
+	"unicode/utf16"
+
+	"golang.org/x/sys/windows"
+)
+
+//sys adjustTokenPrivileges(token windows.Token, releaseAll bool, input *byte, outputSize uint32, output *byte, requiredSize *uint32) (success bool, err error) [true] = advapi32.AdjustTokenPrivileges
+//sys impersonateSelf(level uint32) (err error) = advapi32.ImpersonateSelf
+//sys revertToSelf() (err error) = advapi32.RevertToSelf
+//sys openThreadToken(thread syscall.Handle, accessMask uint32, openAsSelf bool, token *windows.Token) (err error) = advapi32.OpenThreadToken
+//sys getCurrentThread() (h syscall.Handle) = GetCurrentThread
+//sys lookupPrivilegeValue(systemName string, name string, luid *uint64) (err error) = advapi32.LookupPrivilegeValueW
+//sys lookupPrivilegeName(systemName string, luid *uint64, buffer *uint16, size *uint32) (err error) = advapi32.LookupPrivilegeNameW
+//sys lookupPrivilegeDisplayName(systemName string, name *uint16, buffer *uint16, size *uint32, languageId *uint32) (err error) = advapi32.LookupPrivilegeDisplayNameW
+
+const (
+	SE_PRIVILEGE_ENABLED = 2
+
+	ERROR_NOT_ALL_ASSIGNED syscall.Errno = 1300
+
+	SeBackupPrivilege  = "SeBackupPrivilege"
+	SeRestorePrivilege = "SeRestorePrivilege"
+)
+
+const (
+	securityAnonymous = iota
+	securityIdentification
+	securityImpersonation
+	securityDelegation
+)
+
+var (
+	privNames     = make(map[string]uint64)
+	privNameMutex sync.Mutex
+)
+
+// PrivilegeError represents an error enabling privileges.
+type PrivilegeError struct {
+	privileges []uint64
+}
+
+func (e *PrivilegeError) Error() string {
+	s := ""
+	if len(e.privileges) > 1 {
+		s = "Could not enable privileges "
+	} else {
+		s = "Could not enable privilege "
+	}
+	for i, p := range e.privileges {
+		if i != 0 {
+			s += ", "
+		}
+		s += `"`
+		s += getPrivilegeName(p)
+		s += `"`
+	}
+	return s
+}
+
+// RunWithPrivilege enables a single privilege for a function call.
+func RunWithPrivilege(name string, fn func() error) error {
+	return RunWithPrivileges([]string{name}, fn)
+}
+
+// RunWithPrivileges enables privileges for a function call.
+func RunWithPrivileges(names []string, fn func() error) error {
+	privileges, err := mapPrivileges(names)
+	if err != nil {
+		return err
+	}
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	token, err := newThreadToken()
+	if err != nil {
+		return err
+	}
+	defer releaseThreadToken(token)
+	err = adjustPrivileges(token, privileges, SE_PRIVILEGE_ENABLED)
+	if err != nil {
+		return err
+	}
+	return fn()
+}
+
+func mapPrivileges(names []string) ([]uint64, error) {
+	var privileges []uint64
+	privNameMutex.Lock()
+	defer privNameMutex.Unlock()
+	for _, name := range names {
+		p, ok := privNames[name]
+		if !ok {
+			err := lookupPrivilegeValue("", name, &p)
+			if err != nil {
+				return nil, err
+			}
+			privNames[name] = p
+		}
+		privileges = append(privileges, p)
+	}
+	return privileges, nil
+}
+
+// EnableProcessPrivileges enables privileges globally for the process.
+func EnableProcessPrivileges(names []string) error {
+	return enableDisableProcessPrivilege(names, SE_PRIVILEGE_ENABLED)
+}
+
+// DisableProcessPrivileges disables privileges globally for the process.
+func DisableProcessPrivileges(names []string) error {
+	return enableDisableProcessPrivilege(names, 0)
+}
+
+func enableDisableProcessPrivilege(names []string, action uint32) error {
+	privileges, err := mapPrivileges(names)
+	if err != nil {
+		return err
+	}
+
+	p, _ := windows.GetCurrentProcess()
+	var token windows.Token
+	err = windows.OpenProcessToken(p, windows.TOKEN_ADJUST_PRIVILEGES|windows.TOKEN_QUERY, &token)
+	if err != nil {
+		return err
+	}
+
+	defer token.Close()
+	return adjustPrivileges(token, privileges, action)
+}
+
+func adjustPrivileges(token windows.Token, privileges []uint64, action uint32) error {
+	var b bytes.Buffer
+	binary.Write(&b, binary.LittleEndian, uint32(len(privileges)))
+	for _, p := range privileges {
+		binary.Write(&b, binary.LittleEndian, p)
+		binary.Write(&b, binary.LittleEndian, action)
+	}
+	prevState := make([]byte, b.Len())
+	reqSize := uint32(0)
+	success, err := adjustTokenPrivileges(token, false, &b.Bytes()[0], uint32(len(prevState)), &prevState[0], &reqSize)
+	if !success {
+		return err
+	}
+	if err == ERROR_NOT_ALL_ASSIGNED {
+		return &PrivilegeError{privileges}
+	}
+	return nil
+}
+
+func getPrivilegeName(luid uint64) string {
+	var nameBuffer [256]uint16
+	bufSize := uint32(len(nameBuffer))
+	err := lookupPrivilegeName("", &luid, &nameBuffer[0], &bufSize)
+	if err != nil {
+		return fmt.Sprintf("<unknown privilege %d>", luid)
+	}
+
+	var displayNameBuffer [256]uint16
+	displayBufSize := uint32(len(displayNameBuffer))
+	var langID uint32
+	err = lookupPrivilegeDisplayName("", &nameBuffer[0], &displayNameBuffer[0], &displayBufSize, &langID)
+	if err != nil {
+		return fmt.Sprintf("<unknown privilege %s>", string(utf16.Decode(nameBuffer[:bufSize])))
+	}
+
+	return string(utf16.Decode(displayNameBuffer[:displayBufSize]))
+}
+
+func newThreadToken() (windows.Token, error) {
+	err := impersonateSelf(securityImpersonation)
+	if err != nil {
+		return 0, err
+	}
+
+	var token windows.Token
+	err = openThreadToken(getCurrentThread(), syscall.TOKEN_ADJUST_PRIVILEGES|syscall.TOKEN_QUERY, false, &token)
+	if err != nil {
+		rerr := revertToSelf()
+		if rerr != nil {
+			panic(rerr)
+		}
+		return 0, err
+	}
+	return token, nil
+}
+
+func releaseThreadToken(h windows.Token) {
+	err := revertToSelf()
+	if err != nil {
+		panic(err)
+	}
+	h.Close()
+}

vendor/github.com/Microsoft/go-winio/privileges_test.go

@@ -0,0 +1,17 @@
+package winio
+
+import "testing"
+
+func TestRunWithUnavailablePrivilege(t *testing.T) {
+	err := RunWithPrivilege("SeCreateTokenPrivilege", func() error { return nil })
+	if _, ok := err.(*PrivilegeError); err == nil || !ok {
+		t.Fatal("expected PrivilegeError")
+	}
+}
+
+func TestRunWithPrivileges(t *testing.T) {
+	err := RunWithPrivilege("SeShutdownPrivilege", func() error { return nil })
+	if err != nil {
+		t.Fatal(err)
+	}
+}

vendor/github.com/Microsoft/go-winio/reparse.go

@@ -0,0 +1,128 @@
+package winio
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"strings"
+	"unicode/utf16"
+	"unsafe"
+)
+
+const (
+	reparseTagMountPoint = 0xA0000003
+	reparseTagSymlink    = 0xA000000C
+)
+
+type reparseDataBuffer struct {
+	ReparseTag           uint32
+	ReparseDataLength    uint16
+	Reserved             uint16
+	SubstituteNameOffset uint16
+	SubstituteNameLength uint16
+	PrintNameOffset      uint16
+	PrintNameLength      uint16
+}
+
+// ReparsePoint describes a Win32 symlink or mount point.
+type ReparsePoint struct {
+	Target       string
+	IsMountPoint bool
+}
+
+// UnsupportedReparsePointError is returned when trying to decode a non-symlink or
+// mount point reparse point.
+type UnsupportedReparsePointError struct {
+	Tag uint32
+}
+
+func (e *UnsupportedReparsePointError) Error() string {
+	return fmt.Sprintf("unsupported reparse point %x", e.Tag)
+}
+
+// DecodeReparsePoint decodes a Win32 REPARSE_DATA_BUFFER structure containing either a symlink
+// or a mount point.
+func DecodeReparsePoint(b []byte) (*ReparsePoint, error) {
+	tag := binary.LittleEndian.Uint32(b[0:4])
+	return DecodeReparsePointData(tag, b[8:])
+}
+
+func DecodeReparsePointData(tag uint32, b []byte) (*ReparsePoint, error) {
+	isMountPoint := false
+	switch tag {
+	case reparseTagMountPoint:
+		isMountPoint = true
+	case reparseTagSymlink:
+	default:
+		return nil, &UnsupportedReparsePointError{tag}
+	}
+	nameOffset := 8 + binary.LittleEndian.Uint16(b[4:6])
+	if !isMountPoint {
+		nameOffset += 4
+	}
+	nameLength := binary.LittleEndian.Uint16(b[6:8])
+	name := make([]uint16, nameLength/2)
+	err := binary.Read(bytes.NewReader(b[nameOffset:nameOffset+nameLength]), binary.LittleEndian, &name)
+	if err != nil {
+		return nil, err
+	}
+	return &ReparsePoint{string(utf16.Decode(name)), isMountPoint}, nil
+}
+
+func isDriveLetter(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+}
+
+// EncodeReparsePoint encodes a Win32 REPARSE_DATA_BUFFER structure describing a symlink or
+// mount point.
+func EncodeReparsePoint(rp *ReparsePoint) []byte {
+	// Generate an NT path and determine if this is a relative path.
+	var ntTarget string
+	relative := false
+	if strings.HasPrefix(rp.Target, `\\?\`) {
+		ntTarget = `\??\` + rp.Target[4:]
+	} else if strings.HasPrefix(rp.Target, `\\`) {
+		ntTarget = `\??\UNC\` + rp.Target[2:]
+	} else if len(rp.Target) >= 2 && isDriveLetter(rp.Target[0]) && rp.Target[1] == ':' {
+		ntTarget = `\??\` + rp.Target
+	} else {
+		ntTarget = rp.Target
+		relative = true
+	}
+
+	// The paths must be NUL-terminated even though they are counted strings.
+	target16 := utf16.Encode([]rune(rp.Target + "\x00"))
+	ntTarget16 := utf16.Encode([]rune(ntTarget + "\x00"))
+
+	size := int(unsafe.Sizeof(reparseDataBuffer{})) - 8
+	size += len(ntTarget16)*2 + len(target16)*2
+
+	tag := uint32(reparseTagMountPoint)
+	if !rp.IsMountPoint {
+		tag = reparseTagSymlink
+		size += 4 // Add room for symlink flags
+	}
+
+	data := reparseDataBuffer{
+		ReparseTag:           tag,
+		ReparseDataLength:    uint16(size),
+		SubstituteNameOffset: 0,
+		SubstituteNameLength: uint16((len(ntTarget16) - 1) * 2),
+		PrintNameOffset:      uint16(len(ntTarget16) * 2),
+		PrintNameLength:      uint16((len(target16) - 1) * 2),
+	}
+
+	var b bytes.Buffer
+	binary.Write(&b, binary.LittleEndian, &data)
+	if !rp.IsMountPoint {
+		flags := uint32(0)
+		if relative {
+			flags |= 1
+		}
+		binary.Write(&b, binary.LittleEndian, flags)
+	}
+
+	binary.Write(&b, binary.LittleEndian, ntTarget16)
+	binary.Write(&b, binary.LittleEndian, target16)
+	return b.Bytes()
+}

vendor/github.com/Microsoft/go-winio/sd.go

@@ -0,0 +1,98 @@
+// +build windows
+
+package winio
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+//sys lookupAccountName(systemName *uint16, accountName string, sid *byte, sidSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) = advapi32.LookupAccountNameW
+//sys convertSidToStringSid(sid *byte, str **uint16) (err error) = advapi32.ConvertSidToStringSidW
+//sys convertStringSecurityDescriptorToSecurityDescriptor(str string, revision uint32, sd *uintptr, size *uint32) (err error) = advapi32.ConvertStringSecurityDescriptorToSecurityDescriptorW
+//sys convertSecurityDescriptorToStringSecurityDescriptor(sd *byte, revision uint32, secInfo uint32, sddl **uint16, sddlSize *uint32) (err error) = advapi32.ConvertSecurityDescriptorToStringSecurityDescriptorW
+//sys localFree(mem uintptr) = LocalFree
+//sys getSecurityDescriptorLength(sd uintptr) (len uint32) = advapi32.GetSecurityDescriptorLength
+
+const (
+	cERROR_NONE_MAPPED = syscall.Errno(1332)
+)
+
+type AccountLookupError struct {
+	Name string
+	Err  error
+}
+
+func (e *AccountLookupError) Error() string {
+	if e.Name == "" {
+		return "lookup account: empty account name specified"
+	}
+	var s string
+	switch e.Err {
+	case cERROR_NONE_MAPPED:
+		s = "not found"
+	default:
+		s = e.Err.Error()
+	}
+	return "lookup account " + e.Name + ": " + s
+}
+
+type SddlConversionError struct {
+	Sddl string
+	Err  error
+}
+
+func (e *SddlConversionError) Error() string {
+	return "convert " + e.Sddl + ": " + e.Err.Error()
+}
+
+// LookupSidByName looks up the SID of an account by name
+func LookupSidByName(name string) (sid string, err error) {
+	if name == "" {
+		return "", &AccountLookupError{name, cERROR_NONE_MAPPED}
+	}
+
+	var sidSize, sidNameUse, refDomainSize uint32
+	err = lookupAccountName(nil, name, nil, &sidSize, nil, &refDomainSize, &sidNameUse)
+	if err != nil && err != syscall.ERROR_INSUFFICIENT_BUFFER {
+		return "", &AccountLookupError{name, err}
+	}
+	sidBuffer := make([]byte, sidSize)
+	refDomainBuffer := make([]uint16, refDomainSize)
+	err = lookupAccountName(nil, name, &sidBuffer[0], &sidSize, &refDomainBuffer[0], &refDomainSize, &sidNameUse)
+	if err != nil {
+		return "", &AccountLookupError{name, err}
+	}
+	var strBuffer *uint16
+	err = convertSidToStringSid(&sidBuffer[0], &strBuffer)
+	if err != nil {
+		return "", &AccountLookupError{name, err}
+	}
+	sid = syscall.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(strBuffer))[:])
+	localFree(uintptr(unsafe.Pointer(strBuffer)))
+	return sid, nil
+}
+
+func SddlToSecurityDescriptor(sddl string) ([]byte, error) {
+	var sdBuffer uintptr
+	err := convertStringSecurityDescriptorToSecurityDescriptor(sddl, 1, &sdBuffer, nil)
+	if err != nil {
+		return nil, &SddlConversionError{sddl, err}
+	}
+	defer localFree(sdBuffer)
+	sd := make([]byte, getSecurityDescriptorLength(sdBuffer))
+	copy(sd, (*[0xffff]byte)(unsafe.Pointer(sdBuffer))[:len(sd)])
+	return sd, nil
+}
+
+func SecurityDescriptorToSddl(sd []byte) (string, error) {
+	var sddl *uint16
+	// The returned string length seems to including an aribtrary number of terminating NULs.
+	// Don't use it.
+	err := convertSecurityDescriptorToStringSecurityDescriptor(&sd[0], 1, 0xff, &sddl, nil)
+	if err != nil {
+		return "", err
+	}
+	defer localFree(uintptr(unsafe.Pointer(sddl)))
+	return syscall.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(sddl))[:]), nil
+}

vendor/github.com/Microsoft/go-winio/sd_test.go

@@ -0,0 +1,26 @@
+package winio
+
+import "testing"
+
+func TestLookupInvalidSid(t *testing.T) {
+	_, err := LookupSidByName(".\\weoifjdsklfj")
+	aerr, ok := err.(*AccountLookupError)
+	if !ok || aerr.Err != cERROR_NONE_MAPPED {
+		t.Fatalf("expected AccountLookupError with ERROR_NONE_MAPPED, got %s", err)
+	}
+}
+
+func TestLookupValidSid(t *testing.T) {
+	sid, err := LookupSidByName("Everyone")
+	if err != nil || sid != "S-1-1-0" {
+		t.Fatal("expected S-1-1-0, got %s, %s", sid, err)
+	}
+}
+
+func TestLookupEmptyNameFails(t *testing.T) {
+	_, err := LookupSidByName(".\\weoifjdsklfj")
+	aerr, ok := err.(*AccountLookupError)
+	if !ok || aerr.Err != cERROR_NONE_MAPPED {
+		t.Fatalf("expected AccountLookupError with ERROR_NONE_MAPPED, got %s", err)
+	}
+}

vendor/github.com/Microsoft/go-winio/syscall.go

@@ -0,0 +1,3 @@
+package winio
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go file.go pipe.go sd.go fileinfo.go privilege.go backup.go

vendor/github.com/Microsoft/go-winio/wim/decompress.go

@@ -0,0 +1,138 @@
+package wim
+
+import (
+	"encoding/binary"
+	"io"
+	"io/ioutil"
+
+	"github.com/Microsoft/go-winio/wim/lzx"
+)
+
+const chunkSize = 32768 // Compressed resource chunk size
+
+type compressedReader struct {
+	r            *io.SectionReader
+	d            io.ReadCloser
+	chunks       []int64
+	curChunk     int
+	originalSize int64
+}
+
+func newCompressedReader(r *io.SectionReader, originalSize int64, offset int64) (*compressedReader, error) {
+	nchunks := (originalSize + chunkSize - 1) / chunkSize
+	var base int64
+	chunks := make([]int64, nchunks)
+	if originalSize <= 0xffffffff {
+		// 32-bit chunk offsets
+		base = (nchunks - 1) * 4
+		chunks32 := make([]uint32, nchunks-1)
+		err := binary.Read(r, binary.LittleEndian, chunks32)
+		if err != nil {
+			return nil, err
+		}
+		for i, n := range chunks32 {
+			chunks[i+1] = int64(n)
+		}
+
+	} else {
+		// 64-bit chunk offsets
+		base = (nchunks - 1) * 8
+		err := binary.Read(r, binary.LittleEndian, chunks[1:])
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for i, c := range chunks {
+		chunks[i] = c + base
+	}
+
+	cr := &compressedReader{
+		r:            r,
+		chunks:       chunks,
+		originalSize: originalSize,
+	}
+
+	err := cr.reset(int(offset / chunkSize))
+	if err != nil {
+		return nil, err
+	}
+
+	suboff := offset % chunkSize
+	if suboff != 0 {
+		_, err := io.CopyN(ioutil.Discard, cr.d, suboff)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return cr, nil
+}
+
+func (r *compressedReader) chunkOffset(n int) int64 {
+	if n == len(r.chunks) {
+		return r.r.Size()
+	}
+	return r.chunks[n]
+}
+
+func (r *compressedReader) chunkSize(n int) int {
+	return int(r.chunkOffset(n+1) - r.chunkOffset(n))
+}
+
+func (r *compressedReader) uncompressedSize(n int) int {
+	if n < len(r.chunks)-1 {
+		return chunkSize
+	}
+	size := int(r.originalSize % chunkSize)
+	if size == 0 {
+		size = chunkSize
+	}
+	return size
+}
+
+func (r *compressedReader) reset(n int) error {
+	if n >= len(r.chunks) {
+		return io.EOF
+	}
+	if r.d != nil {
+		r.d.Close()
+	}
+	r.curChunk = n
+	size := r.chunkSize(n)
+	uncompressedSize := r.uncompressedSize(n)
+	section := io.NewSectionReader(r.r, r.chunkOffset(n), int64(size))
+	if size != uncompressedSize {
+		d, err := lzx.NewReader(section, uncompressedSize)
+		if err != nil {
+			return err
+		}
+		r.d = d
+	} else {
+		r.d = ioutil.NopCloser(section)
+	}
+
+	return nil
+}
+
+func (r *compressedReader) Read(b []byte) (int, error) {
+	for {
+		n, err := r.d.Read(b)
+		if err != io.EOF {
+			return n, err
+		}
+
+		err = r.reset(r.curChunk + 1)
+		if err != nil {
+			return n, err
+		}
+	}
+}
+
+func (r *compressedReader) Close() error {
+	var err error
+	if r.d != nil {
+		err = r.d.Close()
+		r.d = nil
+	}
+	return err
+}

vendor/github.com/Microsoft/go-winio/wim/lzx/lzx.go

@@ -0,0 +1,614 @@
+// Package lzx implements a decompressor for the the WIM variant of the
+// LZX compression algorithm.
+//
+// The LZX algorithm is an earlier variant of LZX DELTA, which is documented
+// at https://msdn.microsoft.com/en-us/library/cc483133(v=exchg.80).aspx.
+package lzx
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+const (
+	maincodecount = 496
+	maincodesplit = 256
+	lencodecount  = 249
+	lenshift      = 9
+	codemask      = 0x1ff
+	tablebits     = 9
+	tablesize     = 1 << tablebits
+
+	maxBlockSize = 32768
+	windowSize   = 32768
+
+	maxTreePathLen = 16
+
+	e8filesize  = 12000000
+	maxe8offset = 0x3fffffff
+
+	verbatimBlock      = 1
+	alignedOffsetBlock = 2
+	uncompressedBlock  = 3
+)
+
+var footerBits = [...]byte{
+	0, 0, 0, 0, 1, 1, 2, 2,
+	3, 3, 4, 4, 5, 5, 6, 6,
+	7, 7, 8, 8, 9, 9, 10, 10,
+	11, 11, 12, 12, 13, 13, 14,
+}
+
+var basePosition = [...]uint16{
+	0, 1, 2, 3, 4, 6, 8, 12,
+	16, 24, 32, 48, 64, 96, 128, 192,
+	256, 384, 512, 768, 1024, 1536, 2048, 3072,
+	4096, 6144, 8192, 12288, 16384, 24576, 32768,
+}
+
+var (
+	errCorrupt = errors.New("LZX data corrupt")
+)
+
+// Reader is an interface used by the decompressor to access
+// the input stream. If the provided io.Reader does not implement
+// Reader, then a bufio.Reader is used.
+type Reader interface {
+	io.Reader
+	io.ByteReader
+}
+
+type decompressor struct {
+	r            io.Reader
+	err          error
+	unaligned    bool
+	nbits        byte
+	c            uint32
+	lru          [3]uint16
+	uncompressed int
+	windowReader *bytes.Reader
+	mainlens     [maincodecount]byte
+	lenlens      [lencodecount]byte
+	window       [windowSize]byte
+	b            []byte
+	bv           int
+	bo           int
+}
+
+//go:noinline
+func (f *decompressor) fail(err error) {
+	if f.err == nil {
+		f.err = err
+	}
+	f.bo = 0
+	f.bv = 0
+}
+
+func (f *decompressor) ensureAtLeast(n int) error {
+	if f.bv-f.bo >= n {
+		return nil
+	}
+
+	if f.err != nil {
+		return f.err
+	}
+
+	if f.bv != f.bo {
+		copy(f.b[:f.bv-f.bo], f.b[f.bo:f.bv])
+	}
+	n, err := io.ReadAtLeast(f.r, f.b[f.bv-f.bo:], n)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		} else {
+			f.fail(err)
+		}
+		return err
+	}
+	f.bv = f.bv - f.bo + n
+	f.bo = 0
+	return nil
+}
+
+// feed retrieves another 16-bit word from the stream and consumes
+// it into f.c. It returns false if there are no more bytes available.
+// Otherwise, on error, it sets f.err.
+func (f *decompressor) feed() bool {
+	err := f.ensureAtLeast(2)
+	if err != nil {
+		if err == io.ErrUnexpectedEOF {
+			return false
+		}
+	}
+	f.c |= (uint32(f.b[f.bo+1])<<8 | uint32(f.b[f.bo])) << (16 - f.nbits)
+	f.nbits += 16
+	f.bo += 2
+	return true
+}
+
+// getBits retrieves the next n bits from the byte stream. n
+// must be <= 16. It sets f.err on error.
+func (f *decompressor) getBits(n byte) uint16 {
+	if f.nbits < n {
+		if !f.feed() {
+			f.fail(io.ErrUnexpectedEOF)
+		}
+	}
+	c := uint16(f.c >> (32 - n))
+	f.c <<= n
+	f.nbits -= n
+	return c
+}
+
+type huffman struct {
+	extra   [][]uint16
+	maxbits byte
+	table   [tablesize]uint16
+}
+
+// buildTable builds a huffman decoding table from a slice of code lengths,
+// one per code, in order. Each code length must be <= maxTreePathLen.
+// See https://en.wikipedia.org/wiki/Canonical_Huffman_code.
+func buildTable(codelens []byte) *huffman {
+	// Determine the number of codes of each length, and the
+	// maximum length.
+	var count [maxTreePathLen + 1]uint
+	var max byte
+	for _, cl := range codelens {
+		count[cl]++
+		if max < cl {
+			max = cl
+		}
+	}
+
+	if max == 0 {
+		return &huffman{}
+	}
+
+	// Determine the first code of each length.
+	var first [maxTreePathLen + 1]uint
+	code := uint(0)
+	for i := byte(1); i <= max; i++ {
+		code <<= 1
+		first[i] = code
+		code += count[i]
+	}
+
+	if code != 1<<max {
+		return nil
+	}
+
+	// Build a table for code lookup. For code sizes < max,
+	// put all possible suffixes for the code into the table, too.
+	// For max > tablebits, split long codes into additional tables
+	// of suffixes of max-tablebits length.
+	h := &huffman{maxbits: max}
+	if max > tablebits {
+		core := first[tablebits+1] / 2 // Number of codes that fit without extra tables
+		nextra := 1<<tablebits - core  // Number of extra entries
+		h.extra = make([][]uint16, nextra)
+		for code := core; code < 1<<tablebits; code++ {
+			h.table[code] = uint16(code - core)
+			h.extra[code-core] = make([]uint16, 1<<(max-tablebits))
+		}
+	}
+
+	for i, cl := range codelens {
+		if cl != 0 {
+			code := first[cl]
+			first[cl]++
+			v := uint16(cl)<<lenshift | uint16(i)
+			if cl <= tablebits {
+				extendedCode := code << (tablebits - cl)
+				for j := uint(0); j < 1<<(tablebits-cl); j++ {
+					h.table[extendedCode+j] = v
+				}
+			} else {
+				prefix := code >> (cl - tablebits)
+				suffix := code & (1<<(cl-tablebits) - 1)
+				extendedCode := suffix << (max - cl)
+				for j := uint(0); j < 1<<(max-cl); j++ {
+					h.extra[h.table[prefix]][extendedCode+j] = v
+				}
+			}
+		}
+	}
+
+	return h
+}
+
+// getCode retrieves the next code using the provided
+// huffman tree. It sets f.err on error.
+func (f *decompressor) getCode(h *huffman) uint16 {
+	if h.maxbits > 0 {
+		if f.nbits < maxTreePathLen {
+			f.feed()
+		}
+
+		// For codes with length < tablebits, it doesn't matter
+		// what the remainder of the bits used for table lookup
+		// are, since entries with all possible suffixes were
+		// added to the table.
+		c := h.table[f.c>>(32-tablebits)]
+		if c >= 1<<lenshift {
+			// The code is already in c.
+		} else {
+			c = h.extra[c][f.c<<tablebits>>(32-(h.maxbits-tablebits))]
+		}
+
+		n := byte(c >> lenshift)
+		if f.nbits >= n {
+			// Only consume the length of the code, not the maximum
+			// code length.
+			f.c <<= n
+			f.nbits -= n
+			return c & codemask
+		}
+
+		f.fail(io.ErrUnexpectedEOF)
+		return 0
+	}
+
+	// This is an empty tree. It should not be used.
+	f.fail(errCorrupt)
+	return 0
+}
+
+// mod17 computes the value mod 17.
+func mod17(b byte) byte {
+	for b >= 17 {
+		b -= 17
+	}
+	return b
+}
+
+// readTree updates the huffman tree path lengths in lens by
+// reading and decoding lengths from the byte stream. lens
+// should be prepopulated with the previous block's tree's path
+// lengths. For the first block, lens should be zero.
+func (f *decompressor) readTree(lens []byte) error {
+	// Get the pre-tree for the main tree.
+	var pretreeLen [20]byte
+	for i := range pretreeLen {
+		pretreeLen[i] = byte(f.getBits(4))
+	}
+	if f.err != nil {
+		return f.err
+	}
+	h := buildTable(pretreeLen[:])
+
+	// The lengths are encoded as a series of huffman codes
+	// encoded by the pre-tree.
+	for i := 0; i < len(lens); {
+		c := byte(f.getCode(h))
+		if f.err != nil {
+			return f.err
+		}
+		switch {
+		case c <= 16: // length is delta from previous length
+			lens[i] = mod17(lens[i] + 17 - c)
+			i++
+		case c == 17: // next n + 4 lengths are zero
+			zeroes := int(f.getBits(4)) + 4
+			if i+zeroes > len(lens) {
+				return errCorrupt
+			}
+			for j := 0; j < zeroes; j++ {
+				lens[i+j] = 0
+			}
+			i += zeroes
+		case c == 18: // next n + 20 lengths are zero
+			zeroes := int(f.getBits(5)) + 20
+			if i+zeroes > len(lens) {
+				return errCorrupt
+			}
+			for j := 0; j < zeroes; j++ {
+				lens[i+j] = 0
+			}
+			i += zeroes
+		case c == 19: // next n + 4 lengths all have the same value
+			same := int(f.getBits(1)) + 4
+			if i+same > len(lens) {
+				return errCorrupt
+			}
+			c = byte(f.getCode(h))
+			if c > 16 {
+				return errCorrupt
+			}
+			l := mod17(lens[i] + 17 - c)
+			for j := 0; j < same; j++ {
+				lens[i+j] = l
+			}
+			i += same
+		default:
+			return errCorrupt
+		}
+	}
+
+	if f.err != nil {
+		return f.err
+	}
+	return nil
+}
+
+func (f *decompressor) readBlockHeader() (byte, uint16, error) {
+	// If the previous block was an unaligned uncompressed block, restore
+	// 2-byte alignment.
+	if f.unaligned {
+		err := f.ensureAtLeast(1)
+		if err != nil {
+			return 0, 0, err
+		}
+		f.bo++
+		f.unaligned = false
+	}
+
+	blockType := f.getBits(3)
+	full := f.getBits(1)
+	var blockSize uint16
+	if full != 0 {
+		blockSize = maxBlockSize
+	} else {
+		blockSize = f.getBits(16)
+		if blockSize > maxBlockSize {
+			return 0, 0, errCorrupt
+		}
+	}
+
+	if f.err != nil {
+		return 0, 0, f.err
+	}
+
+	switch blockType {
+	case verbatimBlock, alignedOffsetBlock:
+		// The caller will read the huffman trees.
+	case uncompressedBlock:
+		if f.nbits > 16 {
+			panic("impossible: more than one 16-bit word remains")
+		}
+
+		// Drop the remaining bits in the current 16-bit word
+		// If there are no bits left, discard a full 16-bit word.
+		n := f.nbits
+		if n == 0 {
+			n = 16
+		}
+
+		f.getBits(n)
+
+		// Read the LRU values for the next block.
+		err := f.ensureAtLeast(12)
+		if err != nil {
+			return 0, 0, err
+		}
+
+		f.lru[0] = uint16(binary.LittleEndian.Uint32(f.b[f.bo : f.bo+4]))
+		f.lru[1] = uint16(binary.LittleEndian.Uint32(f.b[f.bo+4 : f.bo+8]))
+		f.lru[2] = uint16(binary.LittleEndian.Uint32(f.b[f.bo+8 : f.bo+12]))
+		f.bo += 12
+
+	default:
+		return 0, 0, errCorrupt
+	}
+
+	return byte(blockType), blockSize, nil
+}
+
+// readTrees reads the two or three huffman trees for the current block.
+// readAligned specifies whether to read the aligned offset tree.
+func (f *decompressor) readTrees(readAligned bool) (main *huffman, length *huffman, aligned *huffman, err error) {
+	// Aligned offset blocks start with a small aligned offset tree.
+	if readAligned {
+		var alignedLen [8]byte
+		for i := range alignedLen {
+			alignedLen[i] = byte(f.getBits(3))
+		}
+		aligned = buildTable(alignedLen[:])
+		if aligned == nil {
+			err = errors.New("corrupt")
+			return
+		}
+	}
+
+	// The main tree is encoded in two parts.
+	err = f.readTree(f.mainlens[:maincodesplit])
+	if err != nil {
+		return
+	}
+	err = f.readTree(f.mainlens[maincodesplit:])
+	if err != nil {
+		return
+	}
+
+	main = buildTable(f.mainlens[:])
+	if main == nil {
+		err = errors.New("corrupt")
+		return
+	}
+
+	// The length tree is encoding in a single part.
+	err = f.readTree(f.lenlens[:])
+	if err != nil {
+		return
+	}
+
+	length = buildTable(f.lenlens[:])
+	if length == nil {
+		err = errors.New("corrupt")
+		return
+	}
+
+	err = f.err
+	return
+}
+
+// readCompressedBlock decodes a compressed block, writing into the window
+// starting at start and ending at end, and using the provided huffman trees.
+func (f *decompressor) readCompressedBlock(start, end uint16, hmain, hlength, haligned *huffman) (int, error) {
+	i := start
+	for i < end {
+		main := f.getCode(hmain)
+		if f.err != nil {
+			break
+		}
+		if main < 256 {
+			// Literal byte.
+			f.window[i] = byte(main)
+			i++
+			continue
+		}
+
+		// This is a match backward in the window. Determine
+		// the offset and dlength.
+		matchlen := (main - 256) % 8
+		slot := (main - 256) / 8
+
+		// The length is either the low bits of the code,
+		// or if this is 7, is encoded with the length tree.
+		if matchlen == 7 {
+			matchlen += f.getCode(hlength)
+		}
+		matchlen += 2
+
+		var matchoffset uint16
+		if slot < 3 {
+			// The offset is one of the LRU values.
+			matchoffset = f.lru[slot]
+			f.lru[slot] = f.lru[0]
+			f.lru[0] = matchoffset
+		} else {
+			// The offset is encoded as a combination of the
+			// slot and more bits from the bit stream.
+			offsetbits := footerBits[slot]
+			var verbatimbits, alignedbits uint16
+			if offsetbits > 0 {
+				if haligned != nil && offsetbits >= 3 {
+					// This is an aligned offset block. Combine
+					// the bits written verbatim with the aligned
+					// offset tree code.
+					verbatimbits = f.getBits(offsetbits-3) * 8
+					alignedbits = f.getCode(haligned)
+				} else {
+					// There are no aligned offset bits to read,
+					// only verbatim bits.
+					verbatimbits = f.getBits(offsetbits)
+					alignedbits = 0
+				}
+			}
+			matchoffset = basePosition[slot] + verbatimbits + alignedbits - 2
+			// Update the LRU cache.
+			f.lru[2] = f.lru[1]
+			f.lru[1] = f.lru[0]
+			f.lru[0] = matchoffset
+		}
+
+		if matchoffset <= i && matchlen <= end-i {
+			copyend := i + matchlen
+			for ; i < copyend; i++ {
+				f.window[i] = f.window[i-matchoffset]
+			}
+		} else {
+			f.fail(errCorrupt)
+			break
+		}
+	}
+	return int(i - start), f.err
+}
+
+// readBlock decodes the current block and returns the number of uncompressed bytes.
+func (f *decompressor) readBlock(start uint16) (int, error) {
+	blockType, size, err := f.readBlockHeader()
+	if err != nil {
+		return 0, err
+	}
+
+	if blockType == uncompressedBlock {
+		if size%2 == 1 {
+			// Remember to realign the byte stream at the next block.
+			f.unaligned = true
+		}
+		copied := 0
+		if f.bo < f.bv {
+			copied = int(size)
+			s := int(start)
+			if copied > f.bv-f.bo {
+				copied = f.bv - f.bo
+			}
+			copy(f.window[s:s+copied], f.b[f.bo:f.bo+copied])
+			f.bo += copied
+		}
+		n, err := io.ReadFull(f.r, f.window[start+uint16(copied):start+size])
+		return copied + n, err
+	}
+
+	hmain, hlength, haligned, err := f.readTrees(blockType == alignedOffsetBlock)
+	if err != nil {
+		return 0, err
+	}
+
+	return f.readCompressedBlock(start, start+size, hmain, hlength, haligned)
+}
+
+// decodeE8 reverses the 0xe8 x86 instruction encoding that was performed
+// to the uncompressed data before it was compressed.
+func decodeE8(b []byte, off int64) {
+	if off > maxe8offset || len(b) < 10 {
+		return
+	}
+	for i := 0; i < len(b)-10; i++ {
+		if b[i] == 0xe8 {
+			currentPtr := int32(off) + int32(i)
+			abs := int32(binary.LittleEndian.Uint32(b[i+1 : i+5]))
+			if abs >= -currentPtr && abs < e8filesize {
+				var rel int32
+				if abs >= 0 {
+					rel = abs - currentPtr
+				} else {
+					rel = abs + e8filesize
+				}
+				binary.LittleEndian.PutUint32(b[i+1:i+5], uint32(rel))
+			}
+			i += 4
+		}
+	}
+}
+
+func (f *decompressor) Read(b []byte) (int, error) {
+	// Read and uncompress everything.
+	if f.windowReader == nil {
+		n := 0
+		for n < f.uncompressed {
+			k, err := f.readBlock(uint16(n))
+			if err != nil {
+				return 0, err
+			}
+			n += k
+		}
+		decodeE8(f.window[:f.uncompressed], 0)
+		f.windowReader = bytes.NewReader(f.window[:f.uncompressed])
+	}
+
+	// Just read directly from the window.
+	return f.windowReader.Read(b)
+}
+
+func (f *decompressor) Close() error {
+	return nil
+}
+
+// NewReader returns a new io.ReadCloser that decompresses a
+// WIM LZX stream until uncompressedSize bytes have been returned.
+func NewReader(r io.Reader, uncompressedSize int) (io.ReadCloser, error) {
+	if uncompressedSize > windowSize {
+		return nil, errors.New("uncompressed size is limited to 32KB")
+	}
+	f := &decompressor{
+		lru:          [3]uint16{1, 1, 1},
+		uncompressed: uncompressedSize,
+		b:            make([]byte, 4096),
+		r:            r,
+	}
+	return f, nil
+}

vendor/github.com/Microsoft/go-winio/wim/validate/validate.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/Microsoft/go-winio/wim"
+)
+
+func main() {
+	flag.Parse()
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		panic(err)
+	}
+
+	w, err := wim.NewReader(f)
+	if err != nil {
+		panic(err)
+
+	}
+
+	fmt.Printf("%#v\n%#v\n", w.Image[0], w.Image[0].Windows)
+
+	dir, err := w.Image[0].Open()
+	if err != nil {
+		panic(err)
+	}
+
+	err = recur(dir)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func recur(d *wim.File) error {
+	files, err := d.Readdir()
+	if err != nil {
+		return fmt.Errorf("%s: %s", d.Name, err)
+	}
+	for _, f := range files {
+		if f.IsDir() {
+			err = recur(f)
+			if err != nil {
+				return fmt.Errorf("%s: %s", f.Name, err)
+			}
+		}
+	}
+	return nil
+}

vendor/github.com/Microsoft/go-winio/wim/wim.go

@@ -0,0 +1,866 @@
+// Package wim implements a WIM file parser.
+//
+// WIM files are used to distribute Windows file system and container images.
+// They are documented at https://msdn.microsoft.com/en-us/library/windows/desktop/dd861280.aspx.
+package wim
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/binary"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strconv"
+	"sync"
+	"time"
+	"unicode/utf16"
+)
+
+// File attribute constants from Windows.
+const (
+	FILE_ATTRIBUTE_READONLY            = 0x00000001
+	FILE_ATTRIBUTE_HIDDEN              = 0x00000002
+	FILE_ATTRIBUTE_SYSTEM              = 0x00000004
+	FILE_ATTRIBUTE_DIRECTORY           = 0x00000010
+	FILE_ATTRIBUTE_ARCHIVE             = 0x00000020
+	FILE_ATTRIBUTE_DEVICE              = 0x00000040
+	FILE_ATTRIBUTE_NORMAL              = 0x00000080
+	FILE_ATTRIBUTE_TEMPORARY           = 0x00000100
+	FILE_ATTRIBUTE_SPARSE_FILE         = 0x00000200
+	FILE_ATTRIBUTE_REPARSE_POINT       = 0x00000400
+	FILE_ATTRIBUTE_COMPRESSED          = 0x00000800
+	FILE_ATTRIBUTE_OFFLINE             = 0x00001000
+	FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000
+	FILE_ATTRIBUTE_ENCRYPTED           = 0x00004000
+	FILE_ATTRIBUTE_INTEGRITY_STREAM    = 0x00008000
+	FILE_ATTRIBUTE_VIRTUAL             = 0x00010000
+	FILE_ATTRIBUTE_NO_SCRUB_DATA       = 0x00020000
+	FILE_ATTRIBUTE_EA                  = 0x00040000
+)
+
+// Windows processor architectures.
+const (
+	PROCESSOR_ARCHITECTURE_INTEL         = 0
+	PROCESSOR_ARCHITECTURE_MIPS          = 1
+	PROCESSOR_ARCHITECTURE_ALPHA         = 2
+	PROCESSOR_ARCHITECTURE_PPC           = 3
+	PROCESSOR_ARCHITECTURE_SHX           = 4
+	PROCESSOR_ARCHITECTURE_ARM           = 5
+	PROCESSOR_ARCHITECTURE_IA64          = 6
+	PROCESSOR_ARCHITECTURE_ALPHA64       = 7
+	PROCESSOR_ARCHITECTURE_MSIL          = 8
+	PROCESSOR_ARCHITECTURE_AMD64         = 9
+	PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 = 10
+	PROCESSOR_ARCHITECTURE_NEUTRAL       = 11
+	PROCESSOR_ARCHITECTURE_ARM64         = 12
+)
+
+var wimImageTag = [...]byte{'M', 'S', 'W', 'I', 'M', 0, 0, 0}
+
+type guid struct {
+	Data1 uint32
+	Data2 uint16
+	Data3 uint16
+	Data4 [8]byte
+}
+
+func (g guid) String() string {
+	return fmt.Sprintf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", g.Data1, g.Data2, g.Data3, g.Data4[0], g.Data4[1], g.Data4[2], g.Data4[3], g.Data4[4], g.Data4[5], g.Data4[6], g.Data4[7])
+}
+
+type resourceDescriptor struct {
+	FlagsAndCompressedSize uint64
+	Offset                 int64
+	OriginalSize           int64
+}
+
+type resFlag byte
+
+const (
+	resFlagFree resFlag = 1 << iota
+	resFlagMetadata
+	resFlagCompressed
+	resFlagSpanned
+)
+
+const validate = false
+
+const supportedResFlags = resFlagMetadata | resFlagCompressed
+
+func (r *resourceDescriptor) Flags() resFlag {
+	return resFlag(r.FlagsAndCompressedSize >> 56)
+}
+
+func (r *resourceDescriptor) CompressedSize() int64 {
+	return int64(r.FlagsAndCompressedSize & 0xffffffffffffff)
+}
+
+func (r *resourceDescriptor) String() string {
+	s := fmt.Sprintf("%d bytes at %d", r.CompressedSize(), r.Offset)
+	if r.Flags()&4 != 0 {
+		s += fmt.Sprintf(" (uncompresses to %d)", r.OriginalSize)
+	}
+	return s
+}
+
+// SHA1Hash contains the SHA1 hash of a file or stream.
+type SHA1Hash [20]byte
+
+type streamDescriptor struct {
+	resourceDescriptor
+	PartNumber uint16
+	RefCount   uint32
+	Hash       SHA1Hash
+}
+
+type hdrFlag uint32
+
+const (
+	hdrFlagReserved hdrFlag = 1 << iota
+	hdrFlagCompressed
+	hdrFlagReadOnly
+	hdrFlagSpanned
+	hdrFlagResourceOnly
+	hdrFlagMetadataOnly
+	hdrFlagWriteInProgress
+	hdrFlagRpFix
+)
+
+const (
+	hdrFlagCompressReserved hdrFlag = 1 << (iota + 16)
+	hdrFlagCompressXpress
+	hdrFlagCompressLzx
+)
+
+const supportedHdrFlags = hdrFlagRpFix | hdrFlagReadOnly | hdrFlagCompressed | hdrFlagCompressLzx
+
+type wimHeader struct {
+	ImageTag        [8]byte
+	Size            uint32
+	Version         uint32
+	Flags           hdrFlag
+	CompressionSize uint32
+	WIMGuid         guid
+	PartNumber      uint16
+	TotalParts      uint16
+	ImageCount      uint32
+	OffsetTable     resourceDescriptor
+	XMLData         resourceDescriptor
+	BootMetadata    resourceDescriptor
+	BootIndex       uint32
+	Padding         uint32
+	Integrity       resourceDescriptor
+	Unused          [60]byte
+}
+
+type securityblockDisk struct {
+	TotalLength uint32
+	NumEntries  uint32
+}
+
+const securityblockDiskSize = 8
+
+type direntry struct {
+	Attributes       uint32
+	SecurityID       uint32
+	SubdirOffset     int64
+	Unused1, Unused2 int64
+	CreationTime     Filetime
+	LastAccessTime   Filetime
+	LastWriteTime    Filetime
+	Hash             SHA1Hash
+	Padding          uint32
+	ReparseHardLink  int64
+	StreamCount      uint16
+	ShortNameLength  uint16
+	FileNameLength   uint16
+}
+
+var direntrySize = int64(binary.Size(direntry{}) + 8) // includes an 8-byte length prefix
+
+type streamentry struct {
+	Unused     int64
+	Hash       SHA1Hash
+	NameLength int16
+}
+
+var streamentrySize = int64(binary.Size(streamentry{}) + 8) // includes an 8-byte length prefix
+
+// Filetime represents a Windows time.
+type Filetime struct {
+	LowDateTime  uint32
+	HighDateTime uint32
+}
+
+// Time returns the time as time.Time.
+func (ft *Filetime) Time() time.Time {
+	// 100-nanosecond intervals since January 1, 1601
+	nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
+	// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
+	nsec -= 116444736000000000
+	// convert into nanoseconds
+	nsec *= 100
+	return time.Unix(0, nsec)
+}
+
+// UnmarshalXML unmarshals the time from a WIM XML blob.
+func (ft *Filetime) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type time struct {
+		Low  string `xml:"LOWPART"`
+		High string `xml:"HIGHPART"`
+	}
+	var t time
+	err := d.DecodeElement(&t, &start)
+	if err != nil {
+		return err
+	}
+
+	low, err := strconv.ParseUint(t.Low, 0, 32)
+	if err != nil {
+		return err
+	}
+	high, err := strconv.ParseUint(t.High, 0, 32)
+	if err != nil {
+		return err
+	}
+
+	ft.LowDateTime = uint32(low)
+	ft.HighDateTime = uint32(high)
+	return nil
+}
+
+type info struct {
+	Image []ImageInfo `xml:"IMAGE"`
+}
+
+// ImageInfo contains information about the image.
+type ImageInfo struct {
+	Name         string       `xml:"NAME"`
+	Index        int          `xml:"INDEX,attr"`
+	CreationTime Filetime     `xml:"CREATIONTIME"`
+	ModTime      Filetime     `xml:"LASTMODIFICATIONTIME"`
+	Windows      *WindowsInfo `xml:"WINDOWS"`
+}
+
+// WindowsInfo contains information about the Windows installation in the image.
+type WindowsInfo struct {
+	Arch             byte     `xml:"ARCH"`
+	ProductName      string   `xml:"PRODUCTNAME"`
+	EditionID        string   `xml:"EDITIONID"`
+	InstallationType string   `xml:"INSTALLATIONTYPE"`
+	ProductType      string   `xml:"PRODUCTTYPE"`
+	Languages        []string `xml:"LANGUAGES>LANGUAGE"`
+	DefaultLanguage  string   `xml:"LANGUAGES>DEFAULT"`
+	Version          Version  `xml:"VERSION"`
+	SystemRoot       string   `xml:"SYSTEMROOT"`
+}
+
+// Version represents a Windows build version.
+type Version struct {
+	Major   int `xml:"MAJOR"`
+	Minor   int `xml:"MINOR"`
+	Build   int `xml:"BUILD"`
+	SPBuild int `xml:"SPBUILD"`
+	SPLevel int `xml:"SPLEVEL"`
+}
+
+// ParseError is returned when the WIM cannot be parsed.
+type ParseError struct {
+	Oper string
+	Path string
+	Err  error
+}
+
+func (e *ParseError) Error() string {
+	if e.Path == "" {
+		return "WIM parse error at " + e.Oper + ": " + e.Err.Error()
+	}
+	return fmt.Sprintf("WIM parse error: %s %s: %s", e.Oper, e.Path, e.Err.Error())
+}
+
+// Reader provides functions to read a WIM file.
+type Reader struct {
+	hdr      wimHeader
+	r        io.ReaderAt
+	fileData map[SHA1Hash]resourceDescriptor
+
+	XMLInfo string   // The XML information about the WIM.
+	Image   []*Image // The WIM's images.
+}
+
+// Image represents an image within a WIM file.
+type Image struct {
+	wim        *Reader
+	offset     resourceDescriptor
+	sds        [][]byte
+	rootOffset int64
+	r          io.ReadCloser
+	curOffset  int64
+	m          sync.Mutex
+
+	ImageInfo
+}
+
+// StreamHeader contains alternate data stream metadata.
+type StreamHeader struct {
+	Name string
+	Hash SHA1Hash
+	Size int64
+}
+
+// Stream represents an alternate data stream or reparse point data stream.
+type Stream struct {
+	StreamHeader
+	wim    *Reader
+	offset resourceDescriptor
+}
+
+// FileHeader contains file metadata.
+type FileHeader struct {
+	Name               string
+	ShortName          string
+	Attributes         uint32
+	SecurityDescriptor []byte
+	CreationTime       Filetime
+	LastAccessTime     Filetime
+	LastWriteTime      Filetime
+	Hash               SHA1Hash
+	Size               int64
+	LinkID             int64
+	ReparseTag         uint32
+	ReparseReserved    uint32
+}
+
+// File represents a file or directory in a WIM image.
+type File struct {
+	FileHeader
+	Streams      []*Stream
+	offset       resourceDescriptor
+	img          *Image
+	subdirOffset int64
+}
+
+// NewReader returns a Reader that can be used to read WIM file data.
+func NewReader(f io.ReaderAt) (*Reader, error) {
+	r := &Reader{r: f}
+	section := io.NewSectionReader(f, 0, 0xffff)
+	err := binary.Read(section, binary.LittleEndian, &r.hdr)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.hdr.ImageTag != wimImageTag {
+		return nil, &ParseError{Oper: "image tag", Err: errors.New("not a WIM file")}
+	}
+
+	if r.hdr.Flags&^supportedHdrFlags != 0 {
+		return nil, fmt.Errorf("unsupported WIM flags %x", r.hdr.Flags&^supportedHdrFlags)
+	}
+
+	if r.hdr.CompressionSize != 0x8000 {
+		return nil, fmt.Errorf("unsupported compression size %d", r.hdr.CompressionSize)
+	}
+
+	if r.hdr.TotalParts != 1 {
+		return nil, errors.New("multi-part WIM not supported")
+	}
+
+	fileData, images, err := r.readOffsetTable(&r.hdr.OffsetTable)
+	if err != nil {
+		return nil, err
+	}
+
+	xmlinfo, err := r.readXML()
+	if err != nil {
+		return nil, err
+	}
+
+	var info info
+	err = xml.Unmarshal([]byte(xmlinfo), &info)
+	if err != nil {
+		return nil, &ParseError{Oper: "XML info", Err: err}
+	}
+
+	for i, img := range images {
+		for _, imgInfo := range info.Image {
+			if imgInfo.Index == i+1 {
+				img.ImageInfo = imgInfo
+				break
+			}
+		}
+	}
+
+	r.fileData = fileData
+	r.Image = images
+	r.XMLInfo = xmlinfo
+	return r, nil
+}
+
+// Close releases resources associated with the Reader.
+func (r *Reader) Close() error {
+	for _, img := range r.Image {
+		img.reset()
+	}
+	return nil
+}
+
+func (r *Reader) resourceReader(hdr *resourceDescriptor) (io.ReadCloser, error) {
+	return r.resourceReaderWithOffset(hdr, 0)
+}
+
+func (r *Reader) resourceReaderWithOffset(hdr *resourceDescriptor, offset int64) (io.ReadCloser, error) {
+	var sr io.ReadCloser
+	section := io.NewSectionReader(r.r, hdr.Offset, hdr.CompressedSize())
+	if hdr.Flags()&resFlagCompressed == 0 {
+		section.Seek(offset, 0)
+		sr = ioutil.NopCloser(section)
+	} else {
+		cr, err := newCompressedReader(section, hdr.OriginalSize, offset)
+		if err != nil {
+			return nil, err
+		}
+		sr = cr
+	}
+
+	return sr, nil
+}
+
+func (r *Reader) readResource(hdr *resourceDescriptor) ([]byte, error) {
+	rsrc, err := r.resourceReader(hdr)
+	if err != nil {
+		return nil, err
+	}
+	defer rsrc.Close()
+	return ioutil.ReadAll(rsrc)
+}
+
+func (r *Reader) readXML() (string, error) {
+	if r.hdr.XMLData.CompressedSize() == 0 {
+		return "", nil
+	}
+	rsrc, err := r.resourceReader(&r.hdr.XMLData)
+	if err != nil {
+		return "", err
+	}
+	defer rsrc.Close()
+
+	XMLData := make([]uint16, r.hdr.XMLData.OriginalSize/2)
+	err = binary.Read(rsrc, binary.LittleEndian, XMLData)
+	if err != nil {
+		return "", &ParseError{Oper: "XML data", Err: err}
+	}
+
+	// The BOM will always indicate little-endian UTF-16.
+	if XMLData[0] != 0xfeff {
+		return "", &ParseError{Oper: "XML data", Err: errors.New("invalid BOM")}
+	}
+	return string(utf16.Decode(XMLData[1:])), nil
+}
+
+func (r *Reader) readOffsetTable(res *resourceDescriptor) (map[SHA1Hash]resourceDescriptor, []*Image, error) {
+	fileData := make(map[SHA1Hash]resourceDescriptor)
+	var images []*Image
+
+	offsetTable, err := r.readResource(res)
+	if err != nil {
+		return nil, nil, &ParseError{Oper: "offset table", Err: err}
+	}
+
+	br := bytes.NewReader(offsetTable)
+	for i := 0; ; i++ {
+		var res streamDescriptor
+		err := binary.Read(br, binary.LittleEndian, &res)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, nil, &ParseError{Oper: "offset table", Err: err}
+		}
+		if res.Flags()&^supportedResFlags != 0 {
+			return nil, nil, &ParseError{Oper: "offset table", Err: errors.New("unsupported resource flag")}
+		}
+
+		// Validation for ad-hoc testing
+		if validate {
+			sec, err := r.resourceReader(&res.resourceDescriptor)
+			if err != nil {
+				panic(fmt.Sprint(i, err))
+			}
+			hash := sha1.New()
+			_, err = io.Copy(hash, sec)
+			sec.Close()
+			if err != nil {
+				panic(fmt.Sprint(i, err))
+			}
+			var cmphash SHA1Hash
+			copy(cmphash[:], hash.Sum(nil))
+			if cmphash != res.Hash {
+				panic(fmt.Sprint(i, "hash mismatch"))
+			}
+		}
+
+		if res.Flags()&resFlagMetadata != 0 {
+			image := &Image{
+				wim:    r,
+				offset: res.resourceDescriptor,
+			}
+			images = append(images, image)
+		} else {
+			fileData[res.Hash] = res.resourceDescriptor
+		}
+	}
+
+	if len(images) != int(r.hdr.ImageCount) {
+		return nil, nil, &ParseError{Oper: "offset table", Err: errors.New("mismatched image count")}
+	}
+
+	return fileData, images, nil
+}
+
+func (r *Reader) readSecurityDescriptors(rsrc io.Reader) (sds [][]byte, n int64, err error) {
+	var secBlock securityblockDisk
+	err = binary.Read(rsrc, binary.LittleEndian, &secBlock)
+	if err != nil {
+		err = &ParseError{Oper: "security table", Err: err}
+		return
+	}
+
+	n += securityblockDiskSize
+
+	secSizes := make([]int64, secBlock.NumEntries)
+	err = binary.Read(rsrc, binary.LittleEndian, &secSizes)
+	if err != nil {
+		err = &ParseError{Oper: "security table sizes", Err: err}
+		return
+	}
+
+	n += int64(secBlock.NumEntries * 8)
+
+	sds = make([][]byte, secBlock.NumEntries)
+	for i, size := range secSizes {
+		sd := make([]byte, size&0xffffffff)
+		_, err = io.ReadFull(rsrc, sd)
+		if err != nil {
+			err = &ParseError{Oper: "security descriptor", Err: err}
+			return
+		}
+		n += int64(len(sd))
+		sds[i] = sd
+	}
+
+	secsize := int64((secBlock.TotalLength + 7) &^ 7)
+	if n > secsize {
+		err = &ParseError{Oper: "security descriptor", Err: errors.New("security descriptor table too small")}
+		return
+	}
+
+	_, err = io.CopyN(ioutil.Discard, rsrc, secsize-n)
+	if err != nil {
+		return
+	}
+
+	n = secsize
+	return
+}
+
+// Open parses the image and returns the root directory.
+func (img *Image) Open() (*File, error) {
+	if img.sds == nil {
+		rsrc, err := img.wim.resourceReaderWithOffset(&img.offset, img.rootOffset)
+		if err != nil {
+			return nil, err
+		}
+		sds, n, err := img.wim.readSecurityDescriptors(rsrc)
+		if err != nil {
+			rsrc.Close()
+			return nil, err
+		}
+		img.sds = sds
+		img.r = rsrc
+		img.rootOffset = n
+		img.curOffset = n
+	}
+
+	f, err := img.readdir(img.rootOffset)
+	if err != nil {
+		return nil, err
+	}
+	if len(f) != 1 {
+		return nil, &ParseError{Oper: "root directory", Err: errors.New("expected exactly 1 root directory entry")}
+	}
+	return f[0], err
+}
+
+func (img *Image) reset() {
+	if img.r != nil {
+		img.r.Close()
+		img.r = nil
+	}
+	img.curOffset = -1
+}
+
+func (img *Image) readdir(offset int64) ([]*File, error) {
+	img.m.Lock()
+	defer img.m.Unlock()
+
+	if offset < img.curOffset || offset > img.curOffset+chunkSize {
+		// Reset to seek backward or to seek forward very far.
+		img.reset()
+	}
+	if img.r == nil {
+		rsrc, err := img.wim.resourceReaderWithOffset(&img.offset, offset)
+		if err != nil {
+			return nil, err
+		}
+		img.r = rsrc
+		img.curOffset = offset
+	}
+	if offset > img.curOffset {
+		_, err := io.CopyN(ioutil.Discard, img.r, offset-img.curOffset)
+		if err != nil {
+			img.reset()
+			if err == io.EOF {
+				err = io.ErrUnexpectedEOF
+			}
+			return nil, err
+		}
+	}
+
+	var entries []*File
+	for {
+		e, n, err := img.readNextEntry(img.r)
+		img.curOffset += n
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			img.reset()
+			return nil, err
+		}
+		entries = append(entries, e)
+	}
+	return entries, nil
+}
+
+func (img *Image) readNextEntry(r io.Reader) (*File, int64, error) {
+	var length int64
+	err := binary.Read(r, binary.LittleEndian, &length)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "directory length check", Err: err}
+	}
+
+	if length == 0 {
+		return nil, 8, io.EOF
+	}
+
+	left := length
+	if left < direntrySize {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: errors.New("size too short")}
+	}
+
+	var dentry direntry
+	err = binary.Read(r, binary.LittleEndian, &dentry)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: err}
+	}
+
+	left -= direntrySize
+
+	namesLen := int64(dentry.FileNameLength + 2 + dentry.ShortNameLength)
+	if left < namesLen {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: errors.New("size too short for names")}
+	}
+
+	names := make([]uint16, namesLen/2)
+	err = binary.Read(r, binary.LittleEndian, names)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "file name", Err: err}
+	}
+
+	left -= namesLen
+
+	var name, shortName string
+	if dentry.FileNameLength > 0 {
+		name = string(utf16.Decode(names[:dentry.FileNameLength/2]))
+	}
+
+	if dentry.ShortNameLength > 0 {
+		shortName = string(utf16.Decode(names[dentry.FileNameLength/2+1:]))
+	}
+
+	var offset resourceDescriptor
+	zerohash := SHA1Hash{}
+	if dentry.Hash != zerohash {
+		var ok bool
+		offset, ok = img.wim.fileData[dentry.Hash]
+		if !ok {
+			return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: fmt.Errorf("could not find file data matching hash %#v", dentry)}
+		}
+	}
+
+	f := &File{
+		FileHeader: FileHeader{
+			Attributes:     dentry.Attributes,
+			CreationTime:   dentry.CreationTime,
+			LastAccessTime: dentry.LastAccessTime,
+			LastWriteTime:  dentry.LastWriteTime,
+			Hash:           dentry.Hash,
+			Size:           offset.OriginalSize,
+			Name:           name,
+			ShortName:      shortName,
+		},
+
+		offset:       offset,
+		img:          img,
+		subdirOffset: dentry.SubdirOffset,
+	}
+
+	isDir := false
+
+	if dentry.Attributes&FILE_ATTRIBUTE_REPARSE_POINT == 0 {
+		f.LinkID = dentry.ReparseHardLink
+		if dentry.Attributes&FILE_ATTRIBUTE_DIRECTORY != 0 {
+			isDir = true
+		}
+	} else {
+		f.ReparseTag = uint32(dentry.ReparseHardLink)
+		f.ReparseReserved = uint32(dentry.ReparseHardLink >> 32)
+	}
+
+	if isDir && f.subdirOffset == 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("no subdirectory data for directory")}
+	} else if !isDir && f.subdirOffset != 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("unexpected subdirectory data for non-directory")}
+	}
+
+	if dentry.SecurityID != 0xffffffff {
+		f.SecurityDescriptor = img.sds[dentry.SecurityID]
+	}
+
+	_, err = io.CopyN(ioutil.Discard, r, left)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, err
+	}
+
+	if dentry.StreamCount > 0 {
+		var streams []*Stream
+		for i := uint16(0); i < dentry.StreamCount; i++ {
+			s, n, err := img.readNextStream(r)
+			length += n
+			if err != nil {
+				return nil, 0, err
+			}
+			// The first unnamed stream should be treated as the file stream.
+			if i == 0 && s.Name == "" {
+				f.Hash = s.Hash
+				f.Size = s.Size
+				f.offset = s.offset
+			} else if s.Name != "" {
+				streams = append(streams, s)
+			}
+		}
+		f.Streams = streams
+	}
+
+	if dentry.Attributes&FILE_ATTRIBUTE_REPARSE_POINT != 0 && f.Size == 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("reparse point is missing reparse stream")}
+	}
+
+	return f, length, nil
+}
+
+func (img *Image) readNextStream(r io.Reader) (*Stream, int64, error) {
+	var length int64
+	err := binary.Read(r, binary.LittleEndian, &length)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, &ParseError{Oper: "stream length check", Err: err}
+	}
+
+	left := length
+	if left < streamentrySize {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: errors.New("size too short")}
+	}
+
+	var sentry streamentry
+	err = binary.Read(r, binary.LittleEndian, &sentry)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: err}
+	}
+
+	left -= streamentrySize
+
+	if left < int64(sentry.NameLength) {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: errors.New("size too short for name")}
+	}
+
+	names := make([]uint16, sentry.NameLength/2)
+	err = binary.Read(r, binary.LittleEndian, names)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "file name", Err: err}
+	}
+
+	left -= int64(sentry.NameLength)
+	name := string(utf16.Decode(names))
+
+	var offset resourceDescriptor
+	if sentry.Hash != (SHA1Hash{}) {
+		var ok bool
+		offset, ok = img.wim.fileData[sentry.Hash]
+		if !ok {
+			return nil, 0, &ParseError{Oper: "stream entry", Path: name, Err: fmt.Errorf("could not find file data matching hash %v", sentry.Hash)}
+		}
+	}
+
+	s := &Stream{
+		StreamHeader: StreamHeader{
+			Hash: sentry.Hash,
+			Size: offset.OriginalSize,
+			Name: name,
+		},
+		wim:    img.wim,
+		offset: offset,
+	}
+
+	_, err = io.CopyN(ioutil.Discard, r, left)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, err
+	}
+
+	return s, length, nil
+}
+
+// Open returns an io.ReadCloser that can be used to read the stream's contents.
+func (s *Stream) Open() (io.ReadCloser, error) {
+	return s.wim.resourceReader(&s.offset)
+}
+
+// Open returns an io.ReadCloser that can be used to read the file's contents.
+func (f *File) Open() (io.ReadCloser, error) {
+	return f.img.wim.resourceReader(&f.offset)
+}
+
+// Readdir reads the directory entries.
+func (f *File) Readdir() ([]*File, error) {
+	if !f.IsDir() {
+		return nil, errors.New("not a directory")
+	}
+	return f.img.readdir(f.subdirOffset)
+}
+
+// IsDir returns whether the given file is a directory. It returns false when it
+// is a directory reparse point.
+func (f *FileHeader) IsDir() bool {
+	return f.Attributes&(FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_REPARSE_POINT) == FILE_ATTRIBUTE_DIRECTORY
+}

vendor/github.com/Microsoft/go-winio/zsyscall_windows.go

@@ -0,0 +1,496 @@
+// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package winio
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var _ unsafe.Pointer
+
+var (
+	modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
+	modwinmm    = windows.NewLazySystemDLL("winmm.dll")
+	modadvapi32 = windows.NewLazySystemDLL("advapi32.dll")
+
+	procCancelIoEx                                           = modkernel32.NewProc("CancelIoEx")
+	procCreateIoCompletionPort                               = modkernel32.NewProc("CreateIoCompletionPort")
+	procGetQueuedCompletionStatus                            = modkernel32.NewProc("GetQueuedCompletionStatus")
+	procSetFileCompletionNotificationModes                   = modkernel32.NewProc("SetFileCompletionNotificationModes")
+	proctimeBeginPeriod                                      = modwinmm.NewProc("timeBeginPeriod")
+	procConnectNamedPipe                                     = modkernel32.NewProc("ConnectNamedPipe")
+	procCreateNamedPipeW                                     = modkernel32.NewProc("CreateNamedPipeW")
+	procCreateFileW                                          = modkernel32.NewProc("CreateFileW")
+	procWaitNamedPipeW                                       = modkernel32.NewProc("WaitNamedPipeW")
+	procGetNamedPipeInfo                                     = modkernel32.NewProc("GetNamedPipeInfo")
+	procGetNamedPipeHandleStateW                             = modkernel32.NewProc("GetNamedPipeHandleStateW")
+	procLookupAccountNameW                                   = modadvapi32.NewProc("LookupAccountNameW")
+	procConvertSidToStringSidW                               = modadvapi32.NewProc("ConvertSidToStringSidW")
+	procConvertStringSecurityDescriptorToSecurityDescriptorW = modadvapi32.NewProc("ConvertStringSecurityDescriptorToSecurityDescriptorW")
+	procConvertSecurityDescriptorToStringSecurityDescriptorW = modadvapi32.NewProc("ConvertSecurityDescriptorToStringSecurityDescriptorW")
+	procLocalFree                                            = modkernel32.NewProc("LocalFree")
+	procGetSecurityDescriptorLength                          = modadvapi32.NewProc("GetSecurityDescriptorLength")
+	procGetFileInformationByHandleEx                         = modkernel32.NewProc("GetFileInformationByHandleEx")
+	procSetFileInformationByHandle                           = modkernel32.NewProc("SetFileInformationByHandle")
+	procAdjustTokenPrivileges                                = modadvapi32.NewProc("AdjustTokenPrivileges")
+	procImpersonateSelf                                      = modadvapi32.NewProc("ImpersonateSelf")
+	procRevertToSelf                                         = modadvapi32.NewProc("RevertToSelf")
+	procOpenThreadToken                                      = modadvapi32.NewProc("OpenThreadToken")
+	procGetCurrentThread                                     = modkernel32.NewProc("GetCurrentThread")
+	procLookupPrivilegeValueW                                = modadvapi32.NewProc("LookupPrivilegeValueW")
+	procLookupPrivilegeNameW                                 = modadvapi32.NewProc("LookupPrivilegeNameW")
+	procLookupPrivilegeDisplayNameW                          = modadvapi32.NewProc("LookupPrivilegeDisplayNameW")
+	procBackupRead                                           = modkernel32.NewProc("BackupRead")
+	procBackupWrite                                          = modkernel32.NewProc("BackupWrite")
+)
+
+func cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall(procCancelIoEx.Addr(), 2, uintptr(file), uintptr(unsafe.Pointer(o)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintptr, threadCount uint32) (newport syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall6(procCreateIoCompletionPort.Addr(), 4, uintptr(file), uintptr(port), uintptr(key), uintptr(threadCount), 0, 0)
+	newport = syscall.Handle(r0)
+	if newport == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procGetQueuedCompletionStatus.Addr(), 5, uintptr(port), uintptr(unsafe.Pointer(bytes)), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(o)), uintptr(timeout), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetFileCompletionNotificationModes.Addr(), 2, uintptr(h), uintptr(flags), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func timeBeginPeriod(period uint32) (n int32) {
+	r0, _, _ := syscall.Syscall(proctimeBeginPeriod.Addr(), 1, uintptr(period), 0, 0)
+	n = int32(r0)
+	return
+}
+
+func connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall(procConnectNamedPipe.Addr(), 2, uintptr(pipe), uintptr(unsafe.Pointer(o)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *securityAttributes) (handle syscall.Handle, err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return
+	}
+	return _createNamedPipe(_p0, flags, pipeMode, maxInstances, outSize, inSize, defaultTimeout, sa)
+}
+
+func _createNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *securityAttributes) (handle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall9(procCreateNamedPipeW.Addr(), 8, uintptr(unsafe.Pointer(name)), uintptr(flags), uintptr(pipeMode), uintptr(maxInstances), uintptr(outSize), uintptr(inSize), uintptr(defaultTimeout), uintptr(unsafe.Pointer(sa)), 0)
+	handle = syscall.Handle(r0)
+	if handle == syscall.InvalidHandle {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func createFile(name string, access uint32, mode uint32, sa *securityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return
+	}
+	return _createFile(_p0, access, mode, sa, createmode, attrs, templatefile)
+}
+
+func _createFile(name *uint16, access uint32, mode uint32, sa *securityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall9(procCreateFileW.Addr(), 7, uintptr(unsafe.Pointer(name)), uintptr(access), uintptr(mode), uintptr(unsafe.Pointer(sa)), uintptr(createmode), uintptr(attrs), uintptr(templatefile), 0, 0)
+	handle = syscall.Handle(r0)
+	if handle == syscall.InvalidHandle {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func waitNamedPipe(name string, timeout uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return
+	}
+	return _waitNamedPipe(_p0, timeout)
+}
+
+func _waitNamedPipe(name *uint16, timeout uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procWaitNamedPipeW.Addr(), 2, uintptr(unsafe.Pointer(name)), uintptr(timeout), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procGetNamedPipeInfo.Addr(), 5, uintptr(pipe), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(outSize)), uintptr(unsafe.Pointer(inSize)), uintptr(unsafe.Pointer(maxInstances)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) {
+	r1, _, e1 := syscall.Syscall9(procGetNamedPipeHandleStateW.Addr(), 7, uintptr(pipe), uintptr(unsafe.Pointer(state)), uintptr(unsafe.Pointer(curInstances)), uintptr(unsafe.Pointer(maxCollectionCount)), uintptr(unsafe.Pointer(collectDataTimeout)), uintptr(unsafe.Pointer(userName)), uintptr(maxUserNameSize), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func lookupAccountName(systemName *uint16, accountName string, sid *byte, sidSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(accountName)
+	if err != nil {
+		return
+	}
+	return _lookupAccountName(systemName, _p0, sid, sidSize, refDomain, refDomainSize, sidNameUse)
+}
+
+func _lookupAccountName(systemName *uint16, accountName *uint16, sid *byte, sidSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall9(procLookupAccountNameW.Addr(), 7, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(accountName)), uintptr(unsafe.Pointer(sid)), uintptr(unsafe.Pointer(sidSize)), uintptr(unsafe.Pointer(refDomain)), uintptr(unsafe.Pointer(refDomainSize)), uintptr(unsafe.Pointer(sidNameUse)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func convertSidToStringSid(sid *byte, str **uint16) (err error) {
+	r1, _, e1 := syscall.Syscall(procConvertSidToStringSidW.Addr(), 2, uintptr(unsafe.Pointer(sid)), uintptr(unsafe.Pointer(str)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func convertStringSecurityDescriptorToSecurityDescriptor(str string, revision uint32, sd *uintptr, size *uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(str)
+	if err != nil {
+		return
+	}
+	return _convertStringSecurityDescriptorToSecurityDescriptor(_p0, revision, sd, size)
+}
+
+func _convertStringSecurityDescriptorToSecurityDescriptor(str *uint16, revision uint32, sd *uintptr, size *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procConvertStringSecurityDescriptorToSecurityDescriptorW.Addr(), 4, uintptr(unsafe.Pointer(str)), uintptr(revision), uintptr(unsafe.Pointer(sd)), uintptr(unsafe.Pointer(size)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func convertSecurityDescriptorToStringSecurityDescriptor(sd *byte, revision uint32, secInfo uint32, sddl **uint16, sddlSize *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procConvertSecurityDescriptorToStringSecurityDescriptorW.Addr(), 5, uintptr(unsafe.Pointer(sd)), uintptr(revision), uintptr(secInfo), uintptr(unsafe.Pointer(sddl)), uintptr(unsafe.Pointer(sddlSize)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func localFree(mem uintptr) {
+	syscall.Syscall(procLocalFree.Addr(), 1, uintptr(mem), 0, 0)
+	return
+}
+
+func getSecurityDescriptorLength(sd uintptr) (len uint32) {
+	r0, _, _ := syscall.Syscall(procGetSecurityDescriptorLength.Addr(), 1, uintptr(sd), 0, 0)
+	len = uint32(r0)
+	return
+}
+
+func getFileInformationByHandleEx(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procGetFileInformationByHandleEx.Addr(), 4, uintptr(h), uintptr(class), uintptr(unsafe.Pointer(buffer)), uintptr(size), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setFileInformationByHandle(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetFileInformationByHandle.Addr(), 4, uintptr(h), uintptr(class), uintptr(unsafe.Pointer(buffer)), uintptr(size), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func adjustTokenPrivileges(token windows.Token, releaseAll bool, input *byte, outputSize uint32, output *byte, requiredSize *uint32) (success bool, err error) {
+	var _p0 uint32
+	if releaseAll {
+		_p0 = 1
+	} else {
+		_p0 = 0
+	}
+	r0, _, e1 := syscall.Syscall6(procAdjustTokenPrivileges.Addr(), 6, uintptr(token), uintptr(_p0), uintptr(unsafe.Pointer(input)), uintptr(outputSize), uintptr(unsafe.Pointer(output)), uintptr(unsafe.Pointer(requiredSize)))
+	success = r0 != 0
+	if true {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func impersonateSelf(level uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procImpersonateSelf.Addr(), 1, uintptr(level), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func revertToSelf() (err error) {
+	r1, _, e1 := syscall.Syscall(procRevertToSelf.Addr(), 0, 0, 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func openThreadToken(thread syscall.Handle, accessMask uint32, openAsSelf bool, token *windows.Token) (err error) {
+	var _p0 uint32
+	if openAsSelf {
+		_p0 = 1
+	} else {
+		_p0 = 0
+	}
+	r1, _, e1 := syscall.Syscall6(procOpenThreadToken.Addr(), 4, uintptr(thread), uintptr(accessMask), uintptr(_p0), uintptr(unsafe.Pointer(token)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func getCurrentThread() (h syscall.Handle) {
+	r0, _, _ := syscall.Syscall(procGetCurrentThread.Addr(), 0, 0, 0, 0)
+	h = syscall.Handle(r0)
+	return
+}
+
+func lookupPrivilegeValue(systemName string, name string, luid *uint64) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(systemName)
+	if err != nil {
+		return
+	}
+	var _p1 *uint16
+	_p1, err = syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return
+	}
+	return _lookupPrivilegeValue(_p0, _p1, luid)
+}
+
+func _lookupPrivilegeValue(systemName *uint16, name *uint16, luid *uint64) (err error) {
+	r1, _, e1 := syscall.Syscall(procLookupPrivilegeValueW.Addr(), 3, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(luid)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func lookupPrivilegeName(systemName string, luid *uint64, buffer *uint16, size *uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(systemName)
+	if err != nil {
+		return
+	}
+	return _lookupPrivilegeName(_p0, luid, buffer, size)
+}
+
+func _lookupPrivilegeName(systemName *uint16, luid *uint64, buffer *uint16, size *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLookupPrivilegeNameW.Addr(), 4, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(luid)), uintptr(unsafe.Pointer(buffer)), uintptr(unsafe.Pointer(size)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func lookupPrivilegeDisplayName(systemName string, name *uint16, buffer *uint16, size *uint32, languageId *uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(systemName)
+	if err != nil {
+		return
+	}
+	return _lookupPrivilegeDisplayName(_p0, name, buffer, size, languageId)
+}
+
+func _lookupPrivilegeDisplayName(systemName *uint16, name *uint16, buffer *uint16, size *uint32, languageId *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLookupPrivilegeDisplayNameW.Addr(), 5, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(buffer)), uintptr(unsafe.Pointer(size)), uintptr(unsafe.Pointer(languageId)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func backupRead(h syscall.Handle, b []byte, bytesRead *uint32, abort bool, processSecurity bool, context *uintptr) (err error) {
+	var _p0 *byte
+	if len(b) > 0 {
+		_p0 = &b[0]
+	}
+	var _p1 uint32
+	if abort {
+		_p1 = 1
+	} else {
+		_p1 = 0
+	}
+	var _p2 uint32
+	if processSecurity {
+		_p2 = 1
+	} else {
+		_p2 = 0
+	}
+	r1, _, e1 := syscall.Syscall9(procBackupRead.Addr(), 7, uintptr(h), uintptr(unsafe.Pointer(_p0)), uintptr(len(b)), uintptr(unsafe.Pointer(bytesRead)), uintptr(_p1), uintptr(_p2), uintptr(unsafe.Pointer(context)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func backupWrite(h syscall.Handle, b []byte, bytesWritten *uint32, abort bool, processSecurity bool, context *uintptr) (err error) {
+	var _p0 *byte
+	if len(b) > 0 {
+		_p0 = &b[0]
+	}
+	var _p1 uint32
+	if abort {
+		_p1 = 1
+	} else {
+		_p1 = 0
+	}
+	var _p2 uint32
+	if processSecurity {
+		_p2 = 1
+	} else {
+		_p2 = 0
+	}
+	r1, _, e1 := syscall.Syscall9(procBackupWrite.Addr(), 7, uintptr(h), uintptr(unsafe.Pointer(_p0)), uintptr(len(b)), uintptr(unsafe.Pointer(bytesWritten)), uintptr(_p1), uintptr(_p2), uintptr(unsafe.Pointer(context)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}

vendor/github.com/Microsoft/hcsshim/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Microsoft
+
+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/Microsoft/hcsshim/README.md

@@ -0,0 +1,12 @@
+# hcsshim
+
+This package supports launching Windows Server containers from Go. It is
+primarily used in the [Docker Engine](https://github.com/docker/docker) project,
+but it can be freely used by other projects as well.
+
+This project has adopted the [Microsoft Open Source Code of
+Conduct](https://opensource.microsoft.com/codeofconduct/). For more information
+see the [Code of Conduct
+FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact
+[opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional
+questions or comments.

vendor/github.com/Microsoft/hcsshim/activatelayer.go

@@ -0,0 +1,28 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// ActivateLayer will find the layer with the given id and mount it's filesystem.
+// For a read/write layer, the mounted filesystem will appear as a volume on the
+// host, while a read-only layer is generally expected to be a no-op.
+// An activated layer must later be deactivated via DeactivateLayer.
+func ActivateLayer(info DriverInfo, id string) error {
+	title := "hcsshim::ActivateLayer "
+	logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = activateLayer(&infop, id)
+	if err != nil {
+		err = makeErrorf(err, title, "id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+" - succeeded id=%s flavour=%d", id, info.Flavour)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/baselayer.go

@@ -0,0 +1,183 @@
+package hcsshim
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"syscall"
+
+	"github.com/Microsoft/go-winio"
+)
+
+type baseLayerWriter struct {
+	root         string
+	f            *os.File
+	bw           *winio.BackupFileWriter
+	err          error
+	hasUtilityVM bool
+	dirInfo      []dirInfo
+}
+
+type dirInfo struct {
+	path     string
+	fileInfo winio.FileBasicInfo
+}
+
+// reapplyDirectoryTimes reapplies directory modification, creation, etc. times
+// after processing of the directory tree has completed. The times are expected
+// to be ordered such that parent directories come before child directories.
+func reapplyDirectoryTimes(dis []dirInfo) error {
+	for i := range dis {
+		di := &dis[len(dis)-i-1] // reverse order: process child directories first
+		f, err := winio.OpenForBackup(di.path, syscall.GENERIC_READ|syscall.GENERIC_WRITE, syscall.FILE_SHARE_READ, syscall.OPEN_EXISTING)
+		if err != nil {
+			return err
+		}
+
+		err = winio.SetFileBasicInfo(f, &di.fileInfo)
+		f.Close()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (w *baseLayerWriter) closeCurrentFile() error {
+	if w.f != nil {
+		err := w.bw.Close()
+		err2 := w.f.Close()
+		w.f = nil
+		w.bw = nil
+		if err != nil {
+			return err
+		}
+		if err2 != nil {
+			return err2
+		}
+	}
+	return nil
+}
+
+func (w *baseLayerWriter) Add(name string, fileInfo *winio.FileBasicInfo) (err error) {
+	defer func() {
+		if err != nil {
+			w.err = err
+		}
+	}()
+
+	err = w.closeCurrentFile()
+	if err != nil {
+		return err
+	}
+
+	if filepath.ToSlash(name) == `UtilityVM/Files` {
+		w.hasUtilityVM = true
+	}
+
+	path := filepath.Join(w.root, name)
+	path, err = makeLongAbsPath(path)
+	if err != nil {
+		return err
+	}
+
+	var f *os.File
+	defer func() {
+		if f != nil {
+			f.Close()
+		}
+	}()
+
+	createmode := uint32(syscall.CREATE_NEW)
+	if fileInfo.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
+		err := os.Mkdir(path, 0)
+		if err != nil && !os.IsExist(err) {
+			return err
+		}
+		createmode = syscall.OPEN_EXISTING
+		if fileInfo.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT == 0 {
+			w.dirInfo = append(w.dirInfo, dirInfo{path, *fileInfo})
+		}
+	}
+
+	mode := uint32(syscall.GENERIC_READ | syscall.GENERIC_WRITE | winio.WRITE_DAC | winio.WRITE_OWNER | winio.ACCESS_SYSTEM_SECURITY)
+	f, err = winio.OpenForBackup(path, mode, syscall.FILE_SHARE_READ, createmode)
+	if err != nil {
+		return makeError(err, "Failed to OpenForBackup", path)
+	}
+
+	err = winio.SetFileBasicInfo(f, fileInfo)
+	if err != nil {
+		return makeError(err, "Failed to SetFileBasicInfo", path)
+	}
+
+	w.f = f
+	w.bw = winio.NewBackupFileWriter(f, true)
+	f = nil
+	return nil
+}
+
+func (w *baseLayerWriter) AddLink(name string, target string) (err error) {
+	defer func() {
+		if err != nil {
+			w.err = err
+		}
+	}()
+
+	err = w.closeCurrentFile()
+	if err != nil {
+		return err
+	}
+
+	linkpath, err := makeLongAbsPath(filepath.Join(w.root, name))
+	if err != nil {
+		return err
+	}
+
+	linktarget, err := makeLongAbsPath(filepath.Join(w.root, target))
+	if err != nil {
+		return err
+	}
+
+	return os.Link(linktarget, linkpath)
+}
+
+func (w *baseLayerWriter) Remove(name string) error {
+	return errors.New("base layer cannot have tombstones")
+}
+
+func (w *baseLayerWriter) Write(b []byte) (int, error) {
+	n, err := w.bw.Write(b)
+	if err != nil {
+		w.err = err
+	}
+	return n, err
+}
+
+func (w *baseLayerWriter) Close() error {
+	err := w.closeCurrentFile()
+	if err != nil {
+		return err
+	}
+	if w.err == nil {
+		// Restore the file times of all the directories, since they may have
+		// been modified by creating child directories.
+		err = reapplyDirectoryTimes(w.dirInfo)
+		if err != nil {
+			return err
+		}
+
+		err = ProcessBaseLayer(w.root)
+		if err != nil {
+			return err
+		}
+
+		if w.hasUtilityVM {
+			err = ProcessUtilityVMImage(filepath.Join(w.root, "UtilityVM"))
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return w.err
+}

vendor/github.com/Microsoft/hcsshim/callback.go

@@ -0,0 +1,79 @@
+package hcsshim
+
+import (
+	"sync"
+	"syscall"
+)
+
+var (
+	nextCallback    uintptr
+	callbackMap     = map[uintptr]*notifcationWatcherContext{}
+	callbackMapLock = sync.RWMutex{}
+
+	notificationWatcherCallback = syscall.NewCallback(notificationWatcher)
+
+	// Notifications for HCS_SYSTEM handles
+	hcsNotificationSystemExited          hcsNotification = 0x00000001
+	hcsNotificationSystemCreateCompleted hcsNotification = 0x00000002
+	hcsNotificationSystemStartCompleted  hcsNotification = 0x00000003
+	hcsNotificationSystemPauseCompleted  hcsNotification = 0x00000004
+	hcsNotificationSystemResumeCompleted hcsNotification = 0x00000005
+
+	// Notifications for HCS_PROCESS handles
+	hcsNotificationProcessExited hcsNotification = 0x00010000
+
+	// Common notifications
+	hcsNotificationInvalid           hcsNotification = 0x00000000
+	hcsNotificationServiceDisconnect hcsNotification = 0x01000000
+)
+
+type hcsNotification uint32
+type notificationChannel chan error
+
+type notifcationWatcherContext struct {
+	channels notificationChannels
+	handle   hcsCallback
+}
+
+type notificationChannels map[hcsNotification]notificationChannel
+
+func newChannels() notificationChannels {
+	channels := make(notificationChannels)
+
+	channels[hcsNotificationSystemExited] = make(notificationChannel, 1)
+	channels[hcsNotificationSystemCreateCompleted] = make(notificationChannel, 1)
+	channels[hcsNotificationSystemStartCompleted] = make(notificationChannel, 1)
+	channels[hcsNotificationSystemPauseCompleted] = make(notificationChannel, 1)
+	channels[hcsNotificationSystemResumeCompleted] = make(notificationChannel, 1)
+	channels[hcsNotificationProcessExited] = make(notificationChannel, 1)
+	channels[hcsNotificationServiceDisconnect] = make(notificationChannel, 1)
+	return channels
+}
+func closeChannels(channels notificationChannels) {
+	close(channels[hcsNotificationSystemExited])
+	close(channels[hcsNotificationSystemCreateCompleted])
+	close(channels[hcsNotificationSystemStartCompleted])
+	close(channels[hcsNotificationSystemPauseCompleted])
+	close(channels[hcsNotificationSystemResumeCompleted])
+	close(channels[hcsNotificationProcessExited])
+	close(channels[hcsNotificationServiceDisconnect])
+}
+
+func notificationWatcher(notificationType hcsNotification, callbackNumber uintptr, notificationStatus uintptr, notificationData *uint16) uintptr {
+	var result error
+	if int32(notificationStatus) < 0 {
+		result = syscall.Errno(win32FromHresult(notificationStatus))
+	}
+
+	callbackMapLock.RLock()
+	context := callbackMap[callbackNumber]
+	callbackMapLock.RUnlock()
+
+	if context == nil {
+		return 0
+	}
+
+	context.channels[notificationType] <- result
+
+	return 0
+}

vendor/github.com/Microsoft/hcsshim/cgo.go

@@ -0,0 +1,7 @@
+package hcsshim
+
+import "C"
+
+// This import is needed to make the library compile as CGO because HCSSHIM
+// only works with CGO due to callbacks from HCS comming back from a C thread
+// which is not supported without CGO. See https://github.com/golang/go/issues/10973

vendor/github.com/Microsoft/hcsshim/container.go

@@ -0,0 +1,626 @@
+package hcsshim
+
+import (
+	"encoding/json"
+	"runtime"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+)
+
+var (
+	defaultTimeout = time.Minute * 4
+)
+
+const (
+	pendingUpdatesQuery = `{ "PropertyTypes" : ["PendingUpdates"]}`
+	statisticsQuery     = `{ "PropertyTypes" : ["Statistics"]}`
+	processListQuery    = `{ "PropertyTypes" : ["ProcessList"]}`
+)
+
+type container struct {
+	handleLock     sync.RWMutex
+	handle         hcsSystem
+	id             string
+	callbackNumber uintptr
+}
+
+// ContainerProperties holds the properties for a container and the processes running in that container
+type ContainerProperties struct {
+	ID                string `json:"Id"`
+	Name              string
+	SystemType        string
+	Owner             string
+	SiloGUID          string            `json:"SiloGuid,omitempty"`
+	IsDummy           bool              `json:",omitempty"`
+	RuntimeID         string            `json:"RuntimeId,omitempty"`
+	IsRuntimeTemplate bool              `json:",omitempty"`
+	RuntimeImagePath  string            `json:",omitempty"`
+	Stopped           bool              `json:",omitempty"`
+	ExitType          string            `json:",omitempty"`
+	AreUpdatesPending bool              `json:",omitempty"`
+	ObRoot            string            `json:",omitempty"`
+	Statistics        Statistics        `json:",omitempty"`
+	ProcessList       []ProcessListItem `json:",omitempty"`
+}
+
+// MemoryStats holds the memory statistics for a container
+type MemoryStats struct {
+	UsageCommitBytes            uint64 `json:"MemoryUsageCommitBytes,omitempty"`
+	UsageCommitPeakBytes        uint64 `json:"MemoryUsageCommitPeakBytes,omitempty"`
+	UsagePrivateWorkingSetBytes uint64 `json:"MemoryUsagePrivateWorkingSetBytes,omitempty"`
+}
+
+// ProcessorStats holds the processor statistics for a container
+type ProcessorStats struct {
+	TotalRuntime100ns  uint64 `json:",omitempty"`
+	RuntimeUser100ns   uint64 `json:",omitempty"`
+	RuntimeKernel100ns uint64 `json:",omitempty"`
+}
+
+// StorageStats holds the storage statistics for a container
+type StorageStats struct {
+	ReadCountNormalized  uint64 `json:",omitempty"`
+	ReadSizeBytes        uint64 `json:",omitempty"`
+	WriteCountNormalized uint64 `json:",omitempty"`
+	WriteSizeBytes       uint64 `json:",omitempty"`
+}
+
+// NetworkStats holds the network statistics for a container
+type NetworkStats struct {
+	BytesReceived          uint64 `json:",omitempty"`
+	BytesSent              uint64 `json:",omitempty"`
+	PacketsReceived        uint64 `json:",omitempty"`
+	PacketsSent            uint64 `json:",omitempty"`
+	DroppedPacketsIncoming uint64 `json:",omitempty"`
+	DroppedPacketsOutgoing uint64 `json:",omitempty"`
+	EndpointId             string `json:",omitempty"`
+	InstanceId             string `json:",omitempty"`
+}
+
+// Statistics is the structure returned by a statistics call on a container
+type Statistics struct {
+	Timestamp          time.Time      `json:",omitempty"`
+	ContainerStartTime time.Time      `json:",omitempty"`
+	Uptime100ns        uint64         `json:",omitempty"`
+	Memory             MemoryStats    `json:",omitempty"`
+	Processor          ProcessorStats `json:",omitempty"`
+	Storage            StorageStats   `json:",omitempty"`
+	Network            []NetworkStats `json:",omitempty"`
+}
+
+// ProcessList is the structure of an item returned by a ProcessList call on a container
+type ProcessListItem struct {
+	CreateTimestamp              time.Time `json:",omitempty"`
+	ImageName                    string    `json:",omitempty"`
+	KernelTime100ns              uint64    `json:",omitempty"`
+	MemoryCommitBytes            uint64    `json:",omitempty"`
+	MemoryWorkingSetPrivateBytes uint64    `json:",omitempty"`
+	MemoryWorkingSetSharedBytes  uint64    `json:",omitempty"`
+	ProcessId                    uint32    `json:",omitempty"`
+	UserTime100ns                uint64    `json:",omitempty"`
+}
+
+// CreateContainer creates a new container with the given configuration but does not start it.
+func CreateContainer(id string, c *ContainerConfig) (Container, error) {
+	operation := "CreateContainer"
+	title := "HCSShim::" + operation
+
+	container := &container{
+		id: id,
+	}
+
+	configurationb, err := json.Marshal(c)
+	if err != nil {
+		return nil, err
+	}
+
+	configuration := string(configurationb)
+	logrus.Debugf(title+" id=%s config=%s", id, configuration)
+
+	var (
+		resultp  *uint16
+		identity syscall.Handle
+	)
+	createError := hcsCreateComputeSystem(id, configuration, identity, &container.handle, &resultp)
+
+	if createError == nil || IsPending(createError) {
+		if err := container.registerCallback(); err != nil {
+			return nil, makeContainerError(container, operation, "", err)
+		}
+	}
+
+	err = processAsyncHcsResult(createError, resultp, container.callbackNumber, hcsNotificationSystemCreateCompleted, &defaultTimeout)
+	if err != nil {
+		return nil, makeContainerError(container, operation, configuration, err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s handle=%d", id, container.handle)
+	runtime.SetFinalizer(container, closeContainer)
+	return container, nil
+}
+
+// OpenContainer opens an existing container by ID.
+func OpenContainer(id string) (Container, error) {
+	operation := "OpenContainer"
+	title := "HCSShim::" + operation
+	logrus.Debugf(title+" id=%s", id)
+
+	container := &container{
+		id: id,
+	}
+
+	var (
+		handle  hcsSystem
+		resultp *uint16
+	)
+	err := hcsOpenComputeSystem(id, &handle, &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	container.handle = handle
+
+	if err := container.registerCallback(); err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s handle=%d", id, handle)
+	runtime.SetFinalizer(container, closeContainer)
+	return container, nil
+}
+
+// GetContainers gets a list of the containers on the system that match the query
+func GetContainers(q ComputeSystemQuery) ([]ContainerProperties, error) {
+	operation := "GetContainers"
+	title := "HCSShim::" + operation
+
+	queryb, err := json.Marshal(q)
+	if err != nil {
+		return nil, err
+	}
+
+	query := string(queryb)
+	logrus.Debugf(title+" query=%s", query)
+
+	var (
+		resultp         *uint16
+		computeSystemsp *uint16
+	)
+	err = hcsEnumerateComputeSystems(query, &computeSystemsp, &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return nil, err
+	}
+
+	if computeSystemsp == nil {
+		return nil, ErrUnexpectedValue
+	}
+	computeSystemsRaw := convertAndFreeCoTaskMemBytes(computeSystemsp)
+	computeSystems := []ContainerProperties{}
+	if err := json.Unmarshal(computeSystemsRaw, &computeSystems); err != nil {
+		return nil, err
+	}
+
+	logrus.Debugf(title + " succeeded")
+	return computeSystems, nil
+}
+
+// Start synchronously starts the container.
+func (container *container) Start() error {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Start"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	var resultp *uint16
+	err := hcsStartComputeSystem(container.handle, "", &resultp)
+	err = processAsyncHcsResult(err, resultp, container.callbackNumber, hcsNotificationSystemStartCompleted, &defaultTimeout)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// Shutdown requests a container shutdown, if IsPending() on the error returned is true,
+// it may not actually be shut down until Wait() succeeds.
+func (container *container) Shutdown() error {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Shutdown"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	var resultp *uint16
+	err := hcsShutdownComputeSystem(container.handle, "", &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// Terminate requests a container terminate, if IsPending() on the error returned is true,
+// it may not actually be shut down until Wait() succeeds.
+func (container *container) Terminate() error {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Terminate"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	var resultp *uint16
+	err := hcsTerminateComputeSystem(container.handle, "", &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// Wait synchronously waits for the container to shutdown or terminate.
+func (container *container) Wait() error {
+	operation := "Wait"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	err := waitForNotification(container.callbackNumber, hcsNotificationSystemExited, nil)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// WaitTimeout synchronously waits for the container to terminate or the duration to elapse.
+// If the timeout expires, IsTimeout(err) == true
+func (container *container) WaitTimeout(timeout time.Duration) error {
+	operation := "WaitTimeout"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	err := waitForNotification(container.callbackNumber, hcsNotificationSystemExited, &timeout)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+func (container *container) properties(query string) (*ContainerProperties, error) {
+	var (
+		resultp     *uint16
+		propertiesp *uint16
+	)
+	err := hcsGetComputeSystemProperties(container.handle, query, &propertiesp, &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return nil, err
+	}
+
+	if propertiesp == nil {
+		return nil, ErrUnexpectedValue
+	}
+	propertiesRaw := convertAndFreeCoTaskMemBytes(propertiesp)
+	properties := &ContainerProperties{}
+	if err := json.Unmarshal(propertiesRaw, properties); err != nil {
+		return nil, err
+	}
+	return properties, nil
+}
+
+// HasPendingUpdates returns true if the container has updates pending to install
+func (container *container) HasPendingUpdates() (bool, error) {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "HasPendingUpdates"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return false, makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	properties, err := container.properties(pendingUpdatesQuery)
+	if err != nil {
+		return false, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return properties.AreUpdatesPending, nil
+}
+
+// Statistics returns statistics for the container
+func (container *container) Statistics() (Statistics, error) {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Statistics"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return Statistics{}, makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	properties, err := container.properties(statisticsQuery)
+	if err != nil {
+		return Statistics{}, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return properties.Statistics, nil
+}
+
+// ProcessList returns an array of ProcessListItems for the container
+func (container *container) ProcessList() ([]ProcessListItem, error) {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "ProcessList"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return nil, makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	properties, err := container.properties(processListQuery)
+	if err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return properties.ProcessList, nil
+}
+
+// Pause pauses the execution of the container. This feature is not enabled in TP5.
+func (container *container) Pause() error {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Pause"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	var resultp *uint16
+	err := hcsPauseComputeSystem(container.handle, "", &resultp)
+	err = processAsyncHcsResult(err, resultp, container.callbackNumber, hcsNotificationSystemPauseCompleted, &defaultTimeout)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// Resume resumes the execution of the container. This feature is not enabled in TP5.
+func (container *container) Resume() error {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "Resume"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	if container.handle == 0 {
+		return makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	var resultp *uint16
+	err := hcsResumeComputeSystem(container.handle, "", &resultp)
+	err = processAsyncHcsResult(err, resultp, container.callbackNumber, hcsNotificationSystemResumeCompleted, &defaultTimeout)
+	if err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// CreateProcess launches a new process within the container.
+func (container *container) CreateProcess(c *ProcessConfig) (Process, error) {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "CreateProcess"
+	title := "HCSShim::Container::" + operation
+	var (
+		processInfo   hcsProcessInformation
+		processHandle hcsProcess
+		resultp       *uint16
+	)
+
+	if container.handle == 0 {
+		return nil, makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	// If we are not emulating a console, ignore any console size passed to us
+	if !c.EmulateConsole {
+		c.ConsoleSize[0] = 0
+		c.ConsoleSize[1] = 0
+	}
+
+	configurationb, err := json.Marshal(c)
+	if err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	configuration := string(configurationb)
+	logrus.Debugf(title+" id=%s config=%s", container.id, configuration)
+
+	err = hcsCreateProcess(container.handle, configuration, &processInfo, &processHandle, &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return nil, makeContainerError(container, operation, configuration, err)
+	}
+
+	process := &process{
+		handle:    processHandle,
+		processID: int(processInfo.ProcessId),
+		container: container,
+		cachedPipes: &cachedPipes{
+			stdIn:  processInfo.StdInput,
+			stdOut: processInfo.StdOutput,
+			stdErr: processInfo.StdError,
+		},
+	}
+
+	if err := process.registerCallback(); err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s processid=%s", container.id, process.processID)
+	runtime.SetFinalizer(process, closeProcess)
+	return process, nil
+}
+
+// OpenProcess gets an interface to an existing process within the container.
+func (container *container) OpenProcess(pid int) (Process, error) {
+	container.handleLock.RLock()
+	defer container.handleLock.RUnlock()
+	operation := "OpenProcess"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s, processid=%d", container.id, pid)
+	var (
+		processHandle hcsProcess
+		resultp       *uint16
+	)
+
+	if container.handle == 0 {
+		return nil, makeContainerError(container, operation, "", ErrAlreadyClosed)
+	}
+
+	err := hcsOpenProcess(container.handle, uint32(pid), &processHandle, &resultp)
+	err = processHcsResult(err, resultp)
+	if err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	process := &process{
+		handle:    processHandle,
+		processID: pid,
+		container: container,
+	}
+
+	if err := process.registerCallback(); err != nil {
+		return nil, makeContainerError(container, operation, "", err)
+	}
+
+	logrus.Debugf(title+" succeeded id=%s processid=%s", container.id, process.processID)
+	runtime.SetFinalizer(process, closeProcess)
+	return process, nil
+}
+
+// Close cleans up any state associated with the container but does not terminate or wait for it.
+func (container *container) Close() error {
+	container.handleLock.Lock()
+	defer container.handleLock.Unlock()
+	operation := "Close"
+	title := "HCSShim::Container::" + operation
+	logrus.Debugf(title+" id=%s", container.id)
+
+	// Don't double free this
+	if container.handle == 0 {
+		return nil
+	}
+
+	if err := container.unregisterCallback(); err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	if err := hcsCloseComputeSystem(container.handle); err != nil {
+		return makeContainerError(container, operation, "", err)
+	}
+
+	container.handle = 0
+	runtime.SetFinalizer(container, nil)
+
+	logrus.Debugf(title+" succeeded id=%s", container.id)
+	return nil
+}
+
+// closeContainer wraps container.Close for use by a finalizer
+func closeContainer(container *container) {
+	container.Close()
+}
+
+func (container *container) registerCallback() error {
+	context := &notifcationWatcherContext{
+		channels: newChannels(),
+	}
+
+	callbackMapLock.Lock()
+	callbackNumber := nextCallback
+	nextCallback++
+	callbackMap[callbackNumber] = context
+	callbackMapLock.Unlock()
+
+	var callbackHandle hcsCallback
+	err := hcsRegisterComputeSystemCallback(container.handle, notificationWatcherCallback, callbackNumber, &callbackHandle)
+	if err != nil {
+		return err
+	}
+	context.handle = callbackHandle
+	container.callbackNumber = callbackNumber
+
+	return nil
+}
+
+func (container *container) unregisterCallback() error {
+	callbackNumber := container.callbackNumber
+
+	callbackMapLock.RLock()
+	context := callbackMap[callbackNumber]
+	callbackMapLock.RUnlock()
+
+	if context == nil {
+		return nil
+	}
+
+	handle := context.handle
+
+	if handle == 0 {
+		return nil
+	}
+
+	// hcsUnregisterComputeSystemCallback has its own syncronization
+	// to wait for all callbacks to complete. We must NOT hold the callbackMapLock.
+	err := hcsUnregisterComputeSystemCallback(handle)
+	if err != nil {
+		return err
+	}
+
+	closeChannels(context.channels)
+
+	callbackMapLock.Lock()
+	callbackMap[callbackNumber] = nil
+	callbackMapLock.Unlock()
+
+	handle = 0
+
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/createlayer.go

@@ -0,0 +1,27 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// CreateLayer creates a new, empty, read-only layer on the filesystem based on
+// the parent layer provided.
+func CreateLayer(info DriverInfo, id, parent string) error {
+	title := "hcsshim::CreateLayer "
+	logrus.Debugf(title+"Flavour %d ID %s parent %s", info.Flavour, id, parent)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = createLayer(&infop, id, parent)
+	if err != nil {
+		err = makeErrorf(err, title, "id=%s parent=%s flavour=%d", id, parent, info.Flavour)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+" - succeeded id=%s parent=%s flavour=%d", id, parent, info.Flavour)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/createsandboxlayer.go

@@ -0,0 +1,35 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// CreateSandboxLayer creates and populates new read-write layer for use by a container.
+// This requires both the id of the direct parent layer, as well as the full list
+// of paths to all parent layers up to the base (and including the direct parent
+// whose id was provided).
+func CreateSandboxLayer(info DriverInfo, layerId, parentId string, parentLayerPaths []string) error {
+	title := "hcsshim::CreateSandboxLayer "
+	logrus.Debugf(title+"layerId %s parentId %s", layerId, parentId)
+
+	// Generate layer descriptors
+	layers, err := layerPathsToDescriptors(parentLayerPaths)
+	if err != nil {
+		return err
+	}
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = createSandboxLayer(&infop, layerId, parentId, layers)
+	if err != nil {
+		err = makeErrorf(err, title, "layerId=%s parentId=%s", layerId, parentId)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"- succeeded layerId=%s parentId=%s", layerId, parentId)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/deactivatelayer.go

@@ -0,0 +1,26 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// DeactivateLayer will dismount a layer that was mounted via ActivateLayer.
+func DeactivateLayer(info DriverInfo, id string) error {
+	title := "hcsshim::DeactivateLayer "
+	logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = deactivateLayer(&infop, id)
+	if err != nil {
+		err = makeErrorf(err, title, "id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"succeeded flavour=%d id=%s", info.Flavour, id)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/destroylayer.go

@@ -0,0 +1,27 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// DestroyLayer will remove the on-disk files representing the layer with the given
+// id, including that layer's containing folder, if any.
+func DestroyLayer(info DriverInfo, id string) error {
+	title := "hcsshim::DestroyLayer "
+	logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = destroyLayer(&infop, id)
+	if err != nil {
+		err = makeErrorf(err, title, "id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"succeeded flavour=%d id=%s", info.Flavour, id)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/errors.go

@@ -0,0 +1,205 @@
+package hcsshim
+
+import (
+	"errors"
+	"fmt"
+	"syscall"
+)
+
+var (
+	// ErrComputeSystemDoesNotExist is an error encountered when the container being operated on no longer exists
+	ErrComputeSystemDoesNotExist = syscall.Errno(0xc037010e)
+
+	// ErrElementNotFound is an error encountered when the object being referenced does not exist
+	ErrElementNotFound = syscall.Errno(0x490)
+
+	// ErrHandleClose is an error encountered when the handle generating the notification being waited on has been closed
+	ErrHandleClose = errors.New("hcsshim: the handle generating this notification has been closed")
+
+	// ErrAlreadyClosed is an error encountered when using a handle that has been closed by the Close method
+	ErrAlreadyClosed = errors.New("hcsshim: the handle has already been closed")
+
+	// ErrInvalidNotificationType is an error encountered when an invalid notification type is used
+	ErrInvalidNotificationType = errors.New("hcsshim: invalid notification type")
+
+	// ErrInvalidProcessState is an error encountered when the process is not in a valid state for the requested operation
+	ErrInvalidProcessState = errors.New("the process is in an invalid state for the attempted operation")
+
+	// ErrTimeout is an error encountered when waiting on a notification times out
+	ErrTimeout = errors.New("hcsshim: timeout waiting for notification")
+
+	// ErrUnexpectedContainerExit is the error encountered when a container exits while waiting for
+	// a different expected notification
+	ErrUnexpectedContainerExit = errors.New("unexpected container exit")
+
+	// ErrUnexpectedProcessAbort is the error encountered when communication with the compute service
+	// is lost while waiting for a notification
+	ErrUnexpectedProcessAbort = errors.New("lost communication with compute service")
+
+	// ErrUnexpectedValue is an error encountered when hcs returns an invalid value
+	ErrUnexpectedValue = errors.New("unexpected value returned from hcs")
+
+	// ErrVmcomputeAlreadyStopped is an error encountered when a shutdown or terminate request is made on a stopped container
+	ErrVmcomputeAlreadyStopped = syscall.Errno(0xc0370110)
+
+	// ErrVmcomputeOperationPending is an error encountered when the operation is being completed asynchronously
+	ErrVmcomputeOperationPending = syscall.Errno(0xC0370103)
+
+	// ErrVmcomputeOperationInvalidState is an error encountered when the compute system is not in a valid state for the requested operation
+	ErrVmcomputeOperationInvalidState = syscall.Errno(0xc0370105)
+
+	// ErrProcNotFound is an error encountered when the the process cannot be found
+	ErrProcNotFound = syscall.Errno(0x7f)
+)
+
+// ProcessError is an error encountered in HCS during an operation on a Process object
+type ProcessError struct {
+	Process   *process
+	Operation string
+	ExtraInfo string
+	Err       error
+}
+
+// ContainerError is an error encountered in HCS during an operation on a Container object
+type ContainerError struct {
+	Container *container
+	Operation string
+	ExtraInfo string
+	Err       error
+}
+
+func (e *ContainerError) Error() string {
+	if e == nil {
+		return "<nil>"
+	}
+
+	if e.Container == nil {
+		return "unexpected nil container for error: " + e.Err.Error()
+	}
+
+	s := "container " + e.Container.id
+
+	if e.Operation != "" {
+		s += " encountered an error during " + e.Operation
+	}
+
+	switch e.Err.(type) {
+	case nil:
+		break
+	case syscall.Errno:
+		s += fmt.Sprintf(": failure in a Windows system call: %s (0x%x)", e.Err, win32FromError(e.Err))
+	default:
+		s += fmt.Sprintf(": %s", e.Err.Error())
+	}
+
+	if e.ExtraInfo != "" {
+		s += " extra info: " + e.ExtraInfo
+	}
+
+	return s
+}
+
+func makeContainerError(container *container, operation string, extraInfo string, err error) error {
+	// Don't double wrap errors
+	if _, ok := err.(*ContainerError); ok {
+		return err
+	}
+	containerError := &ContainerError{Container: container, Operation: operation, ExtraInfo: extraInfo, Err: err}
+	return containerError
+}
+
+func (e *ProcessError) Error() string {
+	if e == nil {
+		return "<nil>"
+	}
+
+	if e.Process == nil {
+		return "Unexpected nil process for error: " + e.Err.Error()
+	}
+
+	s := fmt.Sprintf("process %d", e.Process.processID)
+
+	if e.Process.container != nil {
+		s += " in container " + e.Process.container.id
+	}
+
+	if e.Operation != "" {
+		s += " encountered an error during " + e.Operation
+	}
+
+	switch e.Err.(type) {
+	case nil:
+		break
+	case syscall.Errno:
+		s += fmt.Sprintf(": failure in a Windows system call: %s (0x%x)", e.Err, win32FromError(e.Err))
+	default:
+		s += fmt.Sprintf(": %s", e.Err.Error())
+	}
+
+	return s
+}
+
+func makeProcessError(process *process, operation string, extraInfo string, err error) error {
+	// Don't double wrap errors
+	if _, ok := err.(*ProcessError); ok {
+		return err
+	}
+	processError := &ProcessError{Process: process, Operation: operation, ExtraInfo: extraInfo, Err: err}
+	return processError
+}
+
+// IsNotExist checks if an error is caused by the Container or Process not existing.
+// Note: Currently, ErrElementNotFound can mean that a Process has either
+// already exited, or does not exist. Both IsAlreadyStopped and IsNotExist
+// will currently return true when the error is ErrElementNotFound or ErrProcNotFound.
+func IsNotExist(err error) bool {
+	err = getInnerError(err)
+	return err == ErrComputeSystemDoesNotExist ||
+		err == ErrElementNotFound ||
+		err == ErrProcNotFound
+}
+
+// IsAlreadyClosed checks if an error is caused by the Container or Process having been
+// already closed by a call to the Close() method.
+func IsAlreadyClosed(err error) bool {
+	err = getInnerError(err)
+	return err == ErrAlreadyClosed
+}
+
+// IsPending returns a boolean indicating whether the error is that
+// the requested operation is being completed in the background.
+func IsPending(err error) bool {
+	err = getInnerError(err)
+	return err == ErrVmcomputeOperationPending
+}
+
+// IsTimeout returns a boolean indicating whether the error is caused by
+// a timeout waiting for the operation to complete.
+func IsTimeout(err error) bool {
+	err = getInnerError(err)
+	return err == ErrTimeout
+}
+
+// IsAlreadyStopped returns a boolean indicating whether the error is caused by
+// a Container or Process being already stopped.
+// Note: Currently, ErrElementNotFound can mean that a Process has either
+// already exited, or does not exist. Both IsAlreadyStopped and IsNotExist
+// will currently return true when the error is ErrElementNotFound or ErrProcNotFound.
+func IsAlreadyStopped(err error) bool {
+	err = getInnerError(err)
+	return err == ErrVmcomputeAlreadyStopped ||
+		err == ErrElementNotFound ||
+		err == ErrProcNotFound
+}
+
+func getInnerError(err error) error {
+	switch pe := err.(type) {
+	case nil:
+		return nil
+	case *ContainerError:
+		err = pe.Err
+	case *ProcessError:
+		err = pe.Err
+	}
+	return err
+}

vendor/github.com/Microsoft/hcsshim/expandsandboxsize.go

@@ -0,0 +1,26 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// ExpandSandboxSize expands the size of a layer to at least size bytes.
+func ExpandSandboxSize(info DriverInfo, layerId string, size uint64) error {
+	title := "hcsshim::ExpandSandboxSize "
+	logrus.Debugf(title+"layerId=%s size=%d", layerId, size)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = expandSandboxSize(&infop, layerId, size)
+	if err != nil {
+		err = makeErrorf(err, title, "layerId=%s  size=%d", layerId, size)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"- succeeded layerId=%s size=%d", layerId, size)
+	return nil
+}

vendor/github.com/Microsoft/hcsshim/exportlayer.go

@@ -0,0 +1,158 @@
+package hcsshim
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"runtime"
+	"syscall"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Sirupsen/logrus"
+)
+
+// ExportLayer will create a folder at exportFolderPath and fill that folder with
+// the transport format version of the layer identified by layerId. This transport
+// format includes any metadata required for later importing the layer (using
+// ImportLayer), and requires the full list of parent layer paths in order to
+// perform the export.
+func ExportLayer(info DriverInfo, layerId string, exportFolderPath string, parentLayerPaths []string) error {
+	title := "hcsshim::ExportLayer "
+	logrus.Debugf(title+"flavour %d layerId %s folder %s", info.Flavour, layerId, exportFolderPath)
+
+	// Generate layer descriptors
+	layers, err := layerPathsToDescriptors(parentLayerPaths)
+	if err != nil {
+		return err
+	}
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = exportLayer(&infop, layerId, exportFolderPath, layers)
+	if err != nil {
+		err = makeErrorf(err, title, "layerId=%s flavour=%d folder=%s", layerId, info.Flavour, exportFolderPath)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"succeeded flavour=%d layerId=%s folder=%s", info.Flavour, layerId, exportFolderPath)
+	return nil
+}
+
+type LayerReader interface {
+	Next() (string, int64, *winio.FileBasicInfo, error)
+	Read(b []byte) (int, error)
+	Close() error
+}
+
+// FilterLayerReader provides an interface for extracting the contents of an on-disk layer.
+type FilterLayerReader struct {
+	context uintptr
+}
+
+// Next reads the next available file from a layer, ensuring that parent directories are always read
+// before child files and directories.
+//
+// Next returns the file's relative path, size, and basic file metadata. Read() should be used to
+// extract a Win32 backup stream with the remainder of the metadata and the data.
+func (r *FilterLayerReader) Next() (string, int64, *winio.FileBasicInfo, error) {
+	var fileNamep *uint16
+	fileInfo := &winio.FileBasicInfo{}
+	var deleted uint32
+	var fileSize int64
+	err := exportLayerNext(r.context, &fileNamep, fileInfo, &fileSize, &deleted)
+	if err != nil {
+		if err == syscall.ERROR_NO_MORE_FILES {
+			err = io.EOF
+		} else {
+			err = makeError(err, "ExportLayerNext", "")
+		}
+		return "", 0, nil, err
+	}
+	fileName := convertAndFreeCoTaskMemString(fileNamep)
+	if deleted != 0 {
+		fileInfo = nil
+	}
+	if fileName[0] == '\\' {
+		fileName = fileName[1:]
+	}
+	return fileName, fileSize, fileInfo, nil
+}
+
+// Read reads from the current file's Win32 backup stream.
+func (r *FilterLayerReader) Read(b []byte) (int, error) {
+	var bytesRead uint32
+	err := exportLayerRead(r.context, b, &bytesRead)
+	if err != nil {
+		return 0, makeError(err, "ExportLayerRead", "")
+	}
+	if bytesRead == 0 {
+		return 0, io.EOF
+	}
+	return int(bytesRead), nil
+}
+
+// Close frees resources associated with the layer reader. It will return an
+// error if there was an error while reading the layer or of the layer was not
+// completely read.
+func (r *FilterLayerReader) Close() (err error) {
+	if r.context != 0 {
+		err = exportLayerEnd(r.context)
+		if err != nil {
+			err = makeError(err, "ExportLayerEnd", "")
+		}
+		r.context = 0
+	}
+	return
+}
+
+// NewLayerReader returns a new layer reader for reading the contents of an on-disk layer.
+// The caller must have taken the SeBackupPrivilege privilege
+// to call this and any methods on the resulting LayerReader.
+func NewLayerReader(info DriverInfo, layerID string, parentLayerPaths []string) (LayerReader, error) {
+	if procExportLayerBegin.Find() != nil {
+		// The new layer reader is not available on this Windows build. Fall back to the
+		// legacy export code path.
+		path, err := ioutil.TempDir("", "hcs")
+		if err != nil {
+			return nil, err
+		}
+		err = ExportLayer(info, layerID, path, parentLayerPaths)
+		if err != nil {
+			os.RemoveAll(path)
+			return nil, err
+		}
+		return &legacyLayerReaderWrapper{newLegacyLayerReader(path)}, nil
+	}
+
+	layers, err := layerPathsToDescriptors(parentLayerPaths)
+	if err != nil {
+		return nil, err
+	}
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		return nil, err
+	}
+	r := &FilterLayerReader{}
+	err = exportLayerBegin(&infop, layerID, layers, &r.context)
+	if err != nil {
+		return nil, makeError(err, "ExportLayerBegin", "")
+	}
+	runtime.SetFinalizer(r, func(r *FilterLayerReader) { r.Close() })
+	return r, err
+}
+
+type legacyLayerReaderWrapper struct {
+	*legacyLayerReader
+}
+
+func (r *legacyLayerReaderWrapper) Close() error {
+	err := r.legacyLayerReader.Close()
+	os.RemoveAll(r.root)
+	return err
+}

vendor/github.com/Microsoft/hcsshim/getlayermountpath.go

@@ -0,0 +1,55 @@
+package hcsshim
+
+import (
+	"syscall"
+
+	"github.com/Sirupsen/logrus"
+)
+
+// GetLayerMountPath will look for a mounted layer with the given id and return
+// the path at which that layer can be accessed.  This path may be a volume path
+// if the layer is a mounted read-write layer, otherwise it is expected to be the
+// folder path at which the layer is stored.
+func GetLayerMountPath(info DriverInfo, id string) (string, error) {
+	title := "hcsshim::GetLayerMountPath "
+	logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return "", err
+	}
+
+	var mountPathLength uintptr
+	mountPathLength = 0
+
+	// Call the procedure itself.
+	logrus.Debugf("Calling proc (1)")
+	err = getLayerMountPath(&infop, id, &mountPathLength, nil)
+	if err != nil {
+		err = makeErrorf(err, title, "(first call) id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return "", err
+	}
+
+	// Allocate a mount path of the returned length.
+	if mountPathLength == 0 {
+		return "", nil
+	}
+	mountPathp := make([]uint16, mountPathLength)
+	mountPathp[0] = 0
+
+	// Call the procedure again
+	logrus.Debugf("Calling proc (2)")
+	err = getLayerMountPath(&infop, id, &mountPathLength, &mountPathp[0])
+	if err != nil {
+		err = makeErrorf(err, title, "(second call) id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return "", err
+	}
+
+	path := syscall.UTF16ToString(mountPathp[0:])
+	logrus.Debugf(title+"succeeded flavour=%d id=%s path=%s", info.Flavour, id, path)
+	return path, nil
+}

vendor/github.com/Microsoft/hcsshim/getsharedbaseimages.go

@@ -0,0 +1,22 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// GetSharedBaseImages will enumerate the images stored in the common central
+// image store and return descriptive info about those images for the purpose
+// of registering them with the graphdriver, graph, and tagstore.
+func GetSharedBaseImages() (imageData string, err error) {
+	title := "hcsshim::GetSharedBaseImages "
+
+	logrus.Debugf("Calling proc")
+	var buffer *uint16
+	err = getBaseImages(&buffer)
+	if err != nil {
+		err = makeError(err, title, "")
+		logrus.Error(err)
+		return
+	}
+	imageData = convertAndFreeCoTaskMemString(buffer)
+	logrus.Debugf(title+" - succeeded output=%s", imageData)
+	return
+}

vendor/github.com/Microsoft/hcsshim/guid.go

@@ -0,0 +1,19 @@
+package hcsshim
+
+import (
+	"crypto/sha1"
+	"fmt"
+)
+
+type GUID [16]byte
+
+func NewGUID(source string) *GUID {
+	h := sha1.Sum([]byte(source))
+	var g GUID
+	copy(g[0:], h[0:16])
+	return &g
+}
+
+func (g *GUID) ToString() string {
+	return fmt.Sprintf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x-%02x", g[3], g[2], g[1], g[0], g[5], g[4], g[7], g[6], g[8:10], g[10:])
+}

vendor/github.com/Microsoft/hcsshim/hcsshim.go

@@ -0,0 +1,166 @@
+// Shim for the Host Compute Service (HCS) to manage Windows Server
+// containers and Hyper-V containers.
+
+package hcsshim
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+
+	"github.com/Sirupsen/logrus"
+)
+
+//go:generate go run mksyscall_windows.go -output zhcsshim.go hcsshim.go
+
+//sys coTaskMemFree(buffer unsafe.Pointer) = ole32.CoTaskMemFree
+//sys SetCurrentThreadCompartmentId(compartmentId uint32) (hr error) = iphlpapi.SetCurrentThreadCompartmentId
+
+//sys activateLayer(info *driverInfo, id string) (hr error) = vmcompute.ActivateLayer?
+//sys copyLayer(info *driverInfo, srcId string, dstId string, descriptors []WC_LAYER_DESCRIPTOR) (hr error) = vmcompute.CopyLayer?
+//sys createLayer(info *driverInfo, id string, parent string) (hr error) = vmcompute.CreateLayer?
+//sys createSandboxLayer(info *driverInfo, id string, parent string, descriptors []WC_LAYER_DESCRIPTOR) (hr error) = vmcompute.CreateSandboxLayer?
+//sys expandSandboxSize(info *driverInfo, id string, size uint64) (hr error) = vmcompute.ExpandSandboxSize?
+//sys deactivateLayer(info *driverInfo, id string) (hr error) = vmcompute.DeactivateLayer?
+//sys destroyLayer(info *driverInfo, id string) (hr error) = vmcompute.DestroyLayer?
+//sys exportLayer(info *driverInfo, id string, path string, descriptors []WC_LAYER_DESCRIPTOR) (hr error) = vmcompute.ExportLayer?
+//sys getLayerMountPath(info *driverInfo, id string, length *uintptr, buffer *uint16) (hr error) = vmcompute.GetLayerMountPath?
+//sys getBaseImages(buffer **uint16) (hr error) = vmcompute.GetBaseImages?
+//sys importLayer(info *driverInfo, id string, path string, descriptors []WC_LAYER_DESCRIPTOR) (hr error) = vmcompute.ImportLayer?
+//sys layerExists(info *driverInfo, id string, exists *uint32) (hr error) = vmcompute.LayerExists?
+//sys nameToGuid(name string, guid *GUID) (hr error) = vmcompute.NameToGuid?
+//sys prepareLayer(info *driverInfo, id string, descriptors []WC_LAYER_DESCRIPTOR) (hr error) = vmcompute.PrepareLayer?
+//sys unprepareLayer(info *driverInfo, id string) (hr error) = vmcompute.UnprepareLayer?
+//sys processBaseImage(path string) (hr error) = vmcompute.ProcessBaseImage?
+//sys processUtilityImage(path string) (hr error) = vmcompute.ProcessUtilityImage?
+
+//sys importLayerBegin(info *driverInfo, id string, descriptors []WC_LAYER_DESCRIPTOR, context *uintptr) (hr error) = vmcompute.ImportLayerBegin?
+//sys importLayerNext(context uintptr, fileName string, fileInfo *winio.FileBasicInfo) (hr error) = vmcompute.ImportLayerNext?
+//sys importLayerWrite(context uintptr, buffer []byte) (hr error) = vmcompute.ImportLayerWrite?
+//sys importLayerEnd(context uintptr) (hr error) = vmcompute.ImportLayerEnd?
+
+//sys exportLayerBegin(info *driverInfo, id string, descriptors []WC_LAYER_DESCRIPTOR, context *uintptr) (hr error) = vmcompute.ExportLayerBegin?
+//sys exportLayerNext(context uintptr, fileName **uint16, fileInfo *winio.FileBasicInfo, fileSize *int64, deleted *uint32) (hr error) = vmcompute.ExportLayerNext?
+//sys exportLayerRead(context uintptr, buffer []byte, bytesRead *uint32) (hr error) = vmcompute.ExportLayerRead?
+//sys exportLayerEnd(context uintptr) (hr error) = vmcompute.ExportLayerEnd?
+
+//sys hcsEnumerateComputeSystems(query string, computeSystems **uint16, result **uint16) (hr error) = vmcompute.HcsEnumerateComputeSystems?
+//sys hcsCreateComputeSystem(id string, configuration string, identity syscall.Handle, computeSystem *hcsSystem, result **uint16) (hr error) = vmcompute.HcsCreateComputeSystem?
+//sys hcsOpenComputeSystem(id string, computeSystem *hcsSystem, result **uint16) (hr error) = vmcompute.HcsOpenComputeSystem?
+//sys hcsCloseComputeSystem(computeSystem hcsSystem) (hr error) = vmcompute.HcsCloseComputeSystem?
+//sys hcsStartComputeSystem(computeSystem hcsSystem, options string, result **uint16) (hr error) = vmcompute.HcsStartComputeSystem?
+//sys hcsShutdownComputeSystem(computeSystem hcsSystem, options string, result **uint16) (hr error) = vmcompute.HcsShutdownComputeSystem?
+//sys hcsTerminateComputeSystem(computeSystem hcsSystem, options string, result **uint16) (hr error) = vmcompute.HcsTerminateComputeSystem?
+//sys hcsPauseComputeSystem(computeSystem hcsSystem, options string, result **uint16) (hr error) = vmcompute.HcsPauseComputeSystem?
+//sys hcsResumeComputeSystem(computeSystem hcsSystem, options string, result **uint16) (hr error) = vmcompute.HcsResumeComputeSystem?
+//sys hcsGetComputeSystemProperties(computeSystem hcsSystem, propertyQuery string, properties **uint16, result **uint16) (hr error) = vmcompute.HcsGetComputeSystemProperties?
+//sys hcsModifyComputeSystem(computeSystem hcsSystem, configuration string, result **uint16) (hr error) = vmcompute.HcsModifyComputeSystem?
+//sys hcsRegisterComputeSystemCallback(computeSystem hcsSystem, callback uintptr, context uintptr, callbackHandle *hcsCallback) (hr error) = vmcompute.HcsRegisterComputeSystemCallback?
+//sys hcsUnregisterComputeSystemCallback(callbackHandle hcsCallback) (hr error) = vmcompute.HcsUnregisterComputeSystemCallback?
+
+//sys hcsCreateProcess(computeSystem hcsSystem, processParameters string, processInformation *hcsProcessInformation, process *hcsProcess, result **uint16) (hr error) = vmcompute.HcsCreateProcess?
+//sys hcsOpenProcess(computeSystem hcsSystem, pid uint32, process *hcsProcess, result **uint16) (hr error) = vmcompute.HcsOpenProcess?
+//sys hcsCloseProcess(process hcsProcess) (hr error) = vmcompute.HcsCloseProcess?
+//sys hcsTerminateProcess(process hcsProcess, result **uint16) (hr error) = vmcompute.HcsTerminateProcess?
+//sys hcsGetProcessInfo(process hcsProcess, processInformation *hcsProcessInformation, result **uint16) (hr error) = vmcompute.HcsGetProcessInfo?
+//sys hcsGetProcessProperties(process hcsProcess, processProperties **uint16, result **uint16) (hr error) = vmcompute.HcsGetProcessProperties?
+//sys hcsModifyProcess(process hcsProcess, settings string, result **uint16) (hr error) = vmcompute.HcsModifyProcess?
+//sys hcsGetServiceProperties(propertyQuery string, properties **uint16, result **uint16) (hr error) = vmcompute.HcsGetServiceProperties?
+//sys hcsRegisterProcessCallback(process hcsProcess, callback uintptr, context uintptr, callbackHandle *hcsCallback) (hr error) = vmcompute.HcsRegisterProcessCallback?
+//sys hcsUnregisterProcessCallback(callbackHandle hcsCallback) (hr error) = vmcompute.HcsUnregisterProcessCallback?
+
+//sys hcsModifyServiceSettings(settings string, result **uint16) (hr error) = vmcompute.HcsModifyServiceSettings?
+
+//sys _hnsCall(method string, path string, object string, response **uint16) (hr error) = vmcompute.HNSCall?
+
+const (
+	// Specific user-visible exit codes
+	WaitErrExecFailed = 32767
+
+	ERROR_GEN_FAILURE          = syscall.Errno(31)
+	ERROR_SHUTDOWN_IN_PROGRESS = syscall.Errno(1115)
+	WSAEINVAL                  = syscall.Errno(10022)
+
+	// Timeout on wait calls
+	TimeoutInfinite = 0xFFFFFFFF
+)
+
+type HcsError struct {
+	title string
+	rest  string
+	Err   error
+}
+
+type hcsSystem syscall.Handle
+type hcsProcess syscall.Handle
+type hcsCallback syscall.Handle
+
+type hcsProcessInformation struct {
+	ProcessId uint32
+	Reserved  uint32
+	StdInput  syscall.Handle
+	StdOutput syscall.Handle
+	StdError  syscall.Handle
+}
+
+func makeError(err error, title, rest string) error {
+	// Pass through DLL errors directly since they do not originate from HCS.
+	if _, ok := err.(*syscall.DLLError); ok {
+		return err
+	}
+	return &HcsError{title, rest, err}
+}
+
+func makeErrorf(err error, title, format string, a ...interface{}) error {
+	return makeError(err, title, fmt.Sprintf(format, a...))
+}
+
+func win32FromError(err error) uint32 {
+	if herr, ok := err.(*HcsError); ok {
+		return win32FromError(herr.Err)
+	}
+	if code, ok := err.(syscall.Errno); ok {
+		return uint32(code)
+	}
+	return uint32(ERROR_GEN_FAILURE)
+}
+
+func win32FromHresult(hr uintptr) uintptr {
+	if hr&0x1fff0000 == 0x00070000 {
+		return hr & 0xffff
+	}
+	return hr
+}
+
+func (e *HcsError) Error() string {
+	s := e.title
+	if len(s) > 0 && s[len(s)-1] != ' ' {
+		s += " "
+	}
+	s += fmt.Sprintf("failed in Win32: %s (0x%x)", e.Err, win32FromError(e.Err))
+	if e.rest != "" {
+		if e.rest[0] != ' ' {
+			s += " "
+		}
+		s += e.rest
+	}
+	return s
+}
+
+func convertAndFreeCoTaskMemString(buffer *uint16) string {
+	str := syscall.UTF16ToString((*[1 << 30]uint16)(unsafe.Pointer(buffer))[:])
+	coTaskMemFree(unsafe.Pointer(buffer))
+	return str
+}
+
+func convertAndFreeCoTaskMemBytes(buffer *uint16) []byte {
+	return []byte(convertAndFreeCoTaskMemString(buffer))
+}
+
+func processHcsResult(err error, resultp *uint16) error {
+	if resultp != nil {
+		result := convertAndFreeCoTaskMemString(resultp)
+		logrus.Debugf("Result: %s", result)
+	}
+	return err
+}

vendor/github.com/Microsoft/hcsshim/hnsfuncs.go

@@ -0,0 +1,160 @@
+package hcsshim
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+
+	"github.com/Sirupsen/logrus"
+)
+
+type NatPolicy struct {
+	Type         string
+	Protocol     string
+	InternalPort uint16
+	ExternalPort uint16
+}
+
+type QosPolicy struct {
+	Type                            string
+	MaximumOutgoingBandwidthInBytes uint64
+}
+
+type VlanPolicy struct {
+	Type string
+	VLAN uint
+}
+
+type VsidPolicy struct {
+	Type string
+	VSID uint
+}
+
+type PaPolicy struct {
+	Type string
+	PA   string
+}
+
+// Subnet is assoicated with a network and represents a list
+// of subnets available to the network
+type Subnet struct {
+	AddressPrefix  string            `json:",omitempty"`
+	GatewayAddress string            `json:",omitempty"`
+	Policies       []json.RawMessage `json:",omitempty"`
+}
+
+// MacPool is assoicated with a network and represents a list
+// of macaddresses available to the network
+type MacPool struct {
+	StartMacAddress string `json:",omitempty"`
+	EndMacAddress   string `json:",omitempty"`
+}
+
+// HNSNetwork represents a network in HNS
+type HNSNetwork struct {
+	Id                   string            `json:"ID,omitempty"`
+	Name                 string            `json:",omitempty"`
+	Type                 string            `json:",omitempty"`
+	NetworkAdapterName   string            `json:",omitempty"`
+	SourceMac            string            `json:",omitempty"`
+	Policies             []json.RawMessage `json:",omitempty"`
+	MacPools             []MacPool         `json:",omitempty"`
+	Subnets              []Subnet          `json:",omitempty"`
+	DNSSuffix            string            `json:",omitempty"`
+	DNSServerList        string            `json:",omitempty"`
+	DNSServerCompartment uint32            `json:",omitempty"`
+	ManagementIP         string            `json:",omitempty"`
+}
+
+// HNSEndpoint represents a network endpoint in HNS
+type HNSEndpoint struct {
+	Id                 string            `json:"ID,omitempty"`
+	Name               string            `json:",omitempty"`
+	VirtualNetwork     string            `json:",omitempty"`
+	VirtualNetworkName string            `json:",omitempty"`
+	Policies           []json.RawMessage `json:",omitempty"`
+	MacAddress         string            `json:",omitempty"`
+	IPAddress          net.IP            `json:",omitempty"`
+	DNSSuffix          string            `json:",omitempty"`
+	DNSServerList      string            `json:",omitempty"`
+	GatewayAddress     string            `json:",omitempty"`
+	EnableInternalDNS  bool              `json:",omitempty"`
+	DisableICC         bool              `json:",omitempty"`
+	PrefixLength       uint8             `json:",omitempty"`
+	IsRemoteEndpoint   bool              `json:",omitempty"`
+}
+
+type hnsNetworkResponse struct {
+	Success bool
+	Error   string
+	Output  HNSNetwork
+}
+
+type hnsResponse struct {
+	Success bool
+	Error   string
+	Output  json.RawMessage
+}
+
+func hnsCall(method, path, request string, returnResponse interface{}) error {
+	var responseBuffer *uint16
+	err := _hnsCall(method, path, request, &responseBuffer)
+	if err != nil {
+		return makeError(err, "hnsCall ", "")
+	}
+	response := convertAndFreeCoTaskMemString(responseBuffer)
+
+	hnsresponse := &hnsResponse{}
+	if err = json.Unmarshal([]byte(response), &hnsresponse); err != nil {
+		return err
+	}
+
+	if !hnsresponse.Success {
+		return fmt.Errorf("HNS failed with error : %s", hnsresponse.Error)
+	}
+
+	if len(hnsresponse.Output) == 0 {
+		return nil
+	}
+
+	logrus.Debugf("Network Response : %s", hnsresponse.Output)
+	err = json.Unmarshal(hnsresponse.Output, returnResponse)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// HNSNetworkRequest makes a call into HNS to update/query a single network
+func HNSNetworkRequest(method, path, request string) (*HNSNetwork, error) {
+	var network HNSNetwork
+	err := hnsCall(method, "/networks/"+path, request, &network)
+	if err != nil {
+		return nil, err
+	}
+
+	return &network, nil
+}
+
+// HNSListNetworkRequest makes a HNS call to query the list of available networks
+func HNSListNetworkRequest(method, path, request string) ([]HNSNetwork, error) {
+	var network []HNSNetwork
+	err := hnsCall(method, "/networks/"+path, request, &network)
+	if err != nil {
+		return nil, err
+	}
+
+	return network, nil
+}
+
+// HNSEndpointRequest makes a HNS call to modify/query a network endpoint
+func HNSEndpointRequest(method, path, request string) (*HNSEndpoint, error) {
+	endpoint := &HNSEndpoint{}
+	err := hnsCall(method, "/endpoints/"+path, request, &endpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	return endpoint, nil
+}

vendor/github.com/Microsoft/hcsshim/importlayer.go

@@ -0,0 +1,214 @@
+package hcsshim
+
+import (
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"runtime"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Sirupsen/logrus"
+)
+
+// ImportLayer will take the contents of the folder at importFolderPath and import
+// that into a layer with the id layerId.  Note that in order to correctly populate
+// the layer and interperet the transport format, all parent layers must already
+// be present on the system at the paths provided in parentLayerPaths.
+func ImportLayer(info DriverInfo, layerID string, importFolderPath string, parentLayerPaths []string) error {
+	title := "hcsshim::ImportLayer "
+	logrus.Debugf(title+"flavour %d layerId %s folder %s", info.Flavour, layerID, importFolderPath)
+
+	// Generate layer descriptors
+	layers, err := layerPathsToDescriptors(parentLayerPaths)
+	if err != nil {
+		return err
+	}
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return err
+	}
+
+	err = importLayer(&infop, layerID, importFolderPath, layers)
+	if err != nil {
+		err = makeErrorf(err, title, "layerId=%s flavour=%d folder=%s", layerID, info.Flavour, importFolderPath)
+		logrus.Error(err)
+		return err
+	}
+
+	logrus.Debugf(title+"succeeded flavour=%d layerId=%s folder=%s", info.Flavour, layerID, importFolderPath)
+	return nil
+}
+
+// LayerWriter is an interface that supports writing a new container image layer.
+type LayerWriter interface {
+	// Add adds a file to the layer with given metadata.
+	Add(name string, fileInfo *winio.FileBasicInfo) error
+	// AddLink adds a hard link to the layer. The target must already have been added.
+	AddLink(name string, target string) error
+	// Remove removes a file that was present in a parent layer from the layer.
+	Remove(name string) error
+	// Write writes data to the current file. The data must be in the format of a Win32
+	// backup stream.
+	Write(b []byte) (int, error)
+	// Close finishes the layer writing process and releases any resources.
+	Close() error
+}
+
+// FilterLayerWriter provides an interface to write the contents of a layer to the file system.
+type FilterLayerWriter struct {
+	context uintptr
+}
+
+// Add adds a file or directory to the layer. The file's parent directory must have already been added.
+//
+// name contains the file's relative path. fileInfo contains file times and file attributes; the rest
+// of the file metadata and the file data must be written as a Win32 backup stream to the Write() method.
+// winio.BackupStreamWriter can be used to facilitate this.
+func (w *FilterLayerWriter) Add(name string, fileInfo *winio.FileBasicInfo) error {
+	if name[0] != '\\' {
+		name = `\` + name
+	}
+	err := importLayerNext(w.context, name, fileInfo)
+	if err != nil {
+		return makeError(err, "ImportLayerNext", "")
+	}
+	return nil
+}
+
+// AddLink adds a hard link to the layer. The target of the link must have already been added.
+func (w *FilterLayerWriter) AddLink(name string, target string) error {
+	return errors.New("hard links not yet supported")
+}
+
+// Remove removes a file from the layer. The file must have been present in the parent layer.
+//
+// name contains the file's relative path.
+func (w *FilterLayerWriter) Remove(name string) error {
+	if name[0] != '\\' {
+		name = `\` + name
+	}
+	err := importLayerNext(w.context, name, nil)
+	if err != nil {
+		return makeError(err, "ImportLayerNext", "")
+	}
+	return nil
+}
+
+// Write writes more backup stream data to the current file.
+func (w *FilterLayerWriter) Write(b []byte) (int, error) {
+	err := importLayerWrite(w.context, b)
+	if err != nil {
+		err = makeError(err, "ImportLayerWrite", "")
+		return 0, err
+	}
+	return len(b), err
+}
+
+// Close completes the layer write operation. The error must be checked to ensure that the
+// operation was successful.
+func (w *FilterLayerWriter) Close() (err error) {
+	if w.context != 0 {
+		err = importLayerEnd(w.context)
+		if err != nil {
+			err = makeError(err, "ImportLayerEnd", "")
+		}
+		w.context = 0
+	}
+	return
+}
+
+type legacyLayerWriterWrapper struct {
+	*legacyLayerWriter
+	info             DriverInfo
+	layerID          string
+	path             string
+	parentLayerPaths []string
+}
+
+func (r *legacyLayerWriterWrapper) Close() error {
+	defer os.RemoveAll(r.root)
+	err := r.legacyLayerWriter.Close()
+	if err != nil {
+		return err
+	}
+
+	// Use the original path here because ImportLayer does not support long paths for the source in TP5.
+	// But do use a long path for the destination to work around another bug with directories
+	// with MAX_PATH - 12 < length < MAX_PATH.
+	info := r.info
+	fullPath, err := makeLongAbsPath(filepath.Join(info.HomeDir, r.layerID))
+	if err != nil {
+		return err
+	}
+
+	info.HomeDir = ""
+	if err = ImportLayer(info, fullPath, r.path, r.parentLayerPaths); err != nil {
+		return err
+	}
+	// Add any hard links that were collected.
+	for _, lnk := range r.PendingLinks {
+		if err = os.Remove(lnk.Path); err != nil && !os.IsNotExist(err) {
+			return err
+		}
+		if err = os.Link(lnk.Target, lnk.Path); err != nil {
+			return err
+		}
+	}
+	// Prepare the utility VM for use if one is present in the layer.
+	if r.HasUtilityVM {
+		err = ProcessUtilityVMImage(filepath.Join(fullPath, "UtilityVM"))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// NewLayerWriter returns a new layer writer for creating a layer on disk.
+// The caller must have taken the SeBackupPrivilege and SeRestorePrivilege privileges
+// to call this and any methods on the resulting LayerWriter.
+func NewLayerWriter(info DriverInfo, layerID string, parentLayerPaths []string) (LayerWriter, error) {
+	if len(parentLayerPaths) == 0 {
+		// This is a base layer. It gets imported differently.
+		return &baseLayerWriter{
+			root: filepath.Join(info.HomeDir, layerID),
+		}, nil
+	}
+
+	if procImportLayerBegin.Find() != nil {
+		// The new layer reader is not available on this Windows build. Fall back to the
+		// legacy export code path.
+		path, err := ioutil.TempDir("", "hcs")
+		if err != nil {
+			return nil, err
+		}
+		return &legacyLayerWriterWrapper{
+			legacyLayerWriter: newLegacyLayerWriter(path, parentLayerPaths, filepath.Join(info.HomeDir, layerID)),
+			info:              info,
+			layerID:           layerID,
+			path:              path,
+			parentLayerPaths:  parentLayerPaths,
+		}, nil
+	}
+	layers, err := layerPathsToDescriptors(parentLayerPaths)
+	if err != nil {
+		return nil, err
+	}
+
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		return nil, err
+	}
+
+	w := &FilterLayerWriter{}
+	err = importLayerBegin(&infop, layerID, layers, &w.context)
+	if err != nil {
+		return nil, makeError(err, "ImportLayerStart", "")
+	}
+	runtime.SetFinalizer(w, func(w *FilterLayerWriter) { w.Close() })
+	return w, nil
+}

vendor/github.com/Microsoft/hcsshim/interface.go

@@ -0,0 +1,156 @@
+package hcsshim
+
+import (
+	"io"
+	"time"
+)
+
+// ProcessConfig is used as both the input of Container.CreateProcess
+// and to convert the parameters to JSON for passing onto the HCS
+type ProcessConfig struct {
+	ApplicationName  string
+	CommandLine      string
+	User             string
+	WorkingDirectory string
+	Environment      map[string]string
+	EmulateConsole   bool
+	CreateStdInPipe  bool
+	CreateStdOutPipe bool
+	CreateStdErrPipe bool
+	ConsoleSize      [2]uint
+}
+
+type Layer struct {
+	ID   string
+	Path string
+}
+
+type MappedDir struct {
+	HostPath         string
+	ContainerPath    string
+	ReadOnly         bool
+	BandwidthMaximum uint64
+	IOPSMaximum      uint64
+}
+
+type HvRuntime struct {
+	ImagePath    string `json:",omitempty"`
+	SkipTemplate bool   `json:",omitempty"`
+}
+
+// ContainerConfig is used as both the input of CreateContainer
+// and to convert the parameters to JSON for passing onto the HCS
+type ContainerConfig struct {
+	SystemType                 string      // HCS requires this to be hard-coded to "Container"
+	Name                       string      // Name of the container. We use the docker ID.
+	Owner                      string      // The management platform that created this container
+	IsDummy                    bool        // Used for development purposes.
+	VolumePath                 string      `json:",omitempty"` // Windows volume path for scratch space. Used by Windows Server Containers only. Format \\?\\Volume{GUID}
+	IgnoreFlushesDuringBoot    bool        // Optimization hint for container startup in Windows
+	LayerFolderPath            string      `json:",omitempty"` // Where the layer folders are located. Used by Windows Server Containers only. Format  %root%\windowsfilter\containerID
+	Layers                     []Layer     // List of storage layers. Required for Windows Server and Hyper-V Containers. Format ID=GUID;Path=%root%\windowsfilter\layerID
+	Credentials                string      `json:",omitempty"` // Credentials information
+	ProcessorCount             uint32      `json:",omitempty"` // Number of processors to assign to the container.
+	ProcessorWeight            uint64      `json:",omitempty"` // CPU Shares 0..10000 on Windows; where 0 will be omitted and HCS will default.
+	ProcessorMaximum           int64       `json:",omitempty"` // CPU maximum usage percent 1..100
+	StorageIOPSMaximum         uint64      `json:",omitempty"` // Maximum Storage IOPS
+	StorageBandwidthMaximum    uint64      `json:",omitempty"` // Maximum Storage Bandwidth in bytes per second
+	StorageSandboxSize         uint64      `json:",omitempty"` // Size in bytes that the container system drive should be expanded to if smaller
+	MemoryMaximumInMB          int64       `json:",omitempty"` // Maximum memory available to the container in Megabytes
+	HostName                   string      // Hostname
+	MappedDirectories          []MappedDir // List of mapped directories (volumes/mounts)
+	SandboxPath                string      `json:",omitempty"` // Location of unmounted sandbox. Used by Hyper-V containers only. Format %root%\windowsfilter
+	HvPartition                bool        // True if it a Hyper-V Container
+	EndpointList               []string    // List of networking endpoints to be attached to container
+	NetworkSharedContainerName string      `json:",omitempty"` // Name (ID) of the container that we will share the network stack with.
+	HvRuntime                  *HvRuntime  `json:",omitempty"` // Hyper-V container settings. Used by Hyper-V containers only. Format ImagePath=%root%\BaseLayerID\UtilityVM
+	Servicing                  bool        // True if this container is for servicing
+	AllowUnqualifiedDNSQuery   bool        // True to allow unqualified DNS name resolution
+	DNSSearchList              string      `json:",omitempty"` // Comma seperated list of DNS suffixes to use for name resolution
+}
+
+type ComputeSystemQuery struct {
+	IDs    []string `json:"Ids,omitempty"`
+	Types  []string `json:",omitempty"`
+	Names  []string `json:",omitempty"`
+	Owners []string `json:",omitempty"`
+}
+
+// Container represents a created (but not necessarily running) container.
+type Container interface {
+	// Start synchronously starts the container.
+	Start() error
+
+	// Shutdown requests a container shutdown, but it may not actually be shutdown until Wait() succeeds.
+	Shutdown() error
+
+	// Terminate requests a container terminate, but it may not actually be terminated until Wait() succeeds.
+	Terminate() error
+
+	// Waits synchronously waits for the container to shutdown or terminate.
+	Wait() error
+
+	// WaitTimeout synchronously waits for the container to terminate or the duration to elapse. It
+	// returns false if timeout occurs.
+	WaitTimeout(time.Duration) error
+
+	// Pause pauses the execution of a container.
+	Pause() error
+
+	// Resume resumes the execution of a container.
+	Resume() error
+
+	// HasPendingUpdates returns true if the container has updates pending to install.
+	HasPendingUpdates() (bool, error)
+
+	// Statistics returns statistics for a container.
+	Statistics() (Statistics, error)
+
+	// ProcessList returns details for the processes in a container.
+	ProcessList() ([]ProcessListItem, error)
+
+	// CreateProcess launches a new process within the container.
+	CreateProcess(c *ProcessConfig) (Process, error)
+
+	// OpenProcess gets an interface to an existing process within the container.
+	OpenProcess(pid int) (Process, error)
+
+	// Close cleans up any state associated with the container but does not terminate or wait for it.
+	Close() error
+}
+
+// Process represents a running or exited process.
+type Process interface {
+	// Pid returns the process ID of the process within the container.
+	Pid() int
+
+	// Kill signals the process to terminate but does not wait for it to finish terminating.
+	Kill() error
+
+	// Wait waits for the process to exit.
+	Wait() error
+
+	// WaitTimeout waits for the process to exit or the duration to elapse. It returns
+	// false if timeout occurs.
+	WaitTimeout(time.Duration) error
+
+	// ExitCode returns the exit code of the process. The process must have
+	// already terminated.
+	ExitCode() (int, error)
+
+	// ResizeConsole resizes the console of the process.
+	ResizeConsole(width, height uint16) error
+
+	// Stdio returns the stdin, stdout, and stderr pipes, respectively. Closing
+	// these pipes does not close the underlying pipes; it should be possible to
+	// call this multiple times to get multiple interfaces.
+	Stdio() (io.WriteCloser, io.ReadCloser, io.ReadCloser, error)
+
+	// CloseStdin closes the write side of the stdin pipe so that the process is
+	// notified on the read side that there is no more data in stdin.
+	CloseStdin() error
+
+	// Close cleans up any state associated with the process but does not kill
+	// or wait on it.
+	Close() error
+}

vendor/github.com/Microsoft/hcsshim/layerexists.go

@@ -0,0 +1,30 @@
+package hcsshim
+
+import "github.com/Sirupsen/logrus"
+
+// LayerExists will return true if a layer with the given id exists and is known
+// to the system.
+func LayerExists(info DriverInfo, id string) (bool, error) {
+	title := "hcsshim::LayerExists "
+	logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+	// Convert info to API calling convention
+	infop, err := convertDriverInfo(info)
+	if err != nil {
+		logrus.Error(err)
+		return false, err
+	}
+
+	// Call the procedure itself.
+	var exists uint32
+
+	err = layerExists(&infop, id, &exists)
+	if err != nil {
+		err = makeErrorf(err, title, "id=%s flavour=%d", id, info.Flavour)
+		logrus.Error(err)
+		return false, err
+	}
+
+	logrus.Debugf(title+"succeeded flavour=%d id=%s exists=%d", info.Flavour, id, exists)
+	return exists != 0, nil
+}

vendor/github.com/Microsoft/hcsshim/layerutils.go

@@ -0,0 +1,111 @@
+package hcsshim
+
+// This file contains utility functions to support storage (graph) related
+// functionality.
+
+import (
+	"path/filepath"
+	"syscall"
+
+	"github.com/Sirupsen/logrus"
+)
+
+/* To pass into syscall, we need a struct matching the following:
+enum GraphDriverType
+{
+    DiffDriver,
+    FilterDriver
+};
+
+struct DriverInfo {
+    GraphDriverType Flavour;
+    LPCWSTR HomeDir;
+};
+*/
+type DriverInfo struct {
+	Flavour int
+	HomeDir string
+}
+
+type driverInfo struct {
+	Flavour  int
+	HomeDirp *uint16
+}
+
+func convertDriverInfo(info DriverInfo) (driverInfo, error) {
+	homedirp, err := syscall.UTF16PtrFromString(info.HomeDir)
+	if err != nil {
+		logrus.Debugf("Failed conversion of home to pointer for driver info: %s", err.Error())
+		return driverInfo{}, err
+	}
+
+	return driverInfo{
+		Flavour:  info.Flavour,
+		HomeDirp: homedirp,
+	}, nil
+}
+
+/* To pass into syscall, we need a struct matching the following:
+typedef struct _WC_LAYER_DESCRIPTOR {
+
+    //
+    // The ID of the layer
+    //
+
+    GUID LayerId;
+
+    //
+    // Additional flags
+    //
+
+    union {
+        struct {
+            ULONG Reserved : 31;
+            ULONG Dirty : 1;    // Created from sandbox as a result of snapshot
+        };
+        ULONG Value;
+    } Flags;
+
+    //
+    // Path to the layer root directory, null-terminated
+    //
+
+    PCWSTR Path;
+
+} WC_LAYER_DESCRIPTOR, *PWC_LAYER_DESCRIPTOR;
+*/
+type WC_LAYER_DESCRIPTOR struct {
+	LayerId GUID
+	Flags   uint32
+	Pathp   *uint16
+}
+
+func layerPathsToDescriptors(parentLayerPaths []string) ([]WC_LAYER_DESCRIPTOR, error) {
+	// Array of descriptors that gets constructed.
+	var layers []WC_LAYER_DESCRIPTOR
+
+	for i := 0; i < len(parentLayerPaths); i++ {
+		// Create a layer descriptor, using the folder name
+		// as the source for a GUID LayerId
+		_, folderName := filepath.Split(parentLayerPaths[i])
+		g, err := NameToGuid(folderName)
+		if err != nil {
+			logrus.Debugf("Failed to convert name to guid %s", err)
+			return nil, err
+		}
+
+		p, err := syscall.UTF16PtrFromString(parentLayerPaths[i])
+		if err != nil {
+			logrus.Debugf("Failed conversion of parentLayerPath to pointer %s", err)
+			return nil, err
+		}
+
+		layers = append(layers, WC_LAYER_DESCRIPTOR{
+			LayerId: g,
+			Flags:   0,
+			Pathp:   p,
+		})
+	}
+
+	return layers, nil
+}

vendor/github.com/Microsoft/hcsshim/legacy.go

@@ -0,0 +1,723 @@
+package hcsshim
+
+import (
+	"bufio"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"github.com/Microsoft/go-winio"
+)
+
+var errorIterationCanceled = errors.New("")
+
+var mutatedUtilityVMFiles = map[string]bool{
+	`EFI\Microsoft\Boot\BCD`:      true,
+	`EFI\Microsoft\Boot\BCD.LOG`:  true,
+	`EFI\Microsoft\Boot\BCD.LOG1`: true,
+	`EFI\Microsoft\Boot\BCD.LOG2`: true,
+}
+
+func openFileOrDir(path string, mode uint32, createDisposition uint32) (file *os.File, err error) {
+	return winio.OpenForBackup(path, mode, syscall.FILE_SHARE_READ, createDisposition)
+}
+
+func makeLongAbsPath(path string) (string, error) {
+	if strings.HasPrefix(path, `\\?\`) || strings.HasPrefix(path, `\\.\`) {
+		return path, nil
+	}
+	if !filepath.IsAbs(path) {
+		absPath, err := filepath.Abs(path)
+		if err != nil {
+			return "", err
+		}
+		path = absPath
+	}
+	if strings.HasPrefix(path, `\\`) {
+		return `\\?\UNC\` + path[2:], nil
+	}
+	return `\\?\` + path, nil
+}
+
+type fileEntry struct {
+	path string
+	fi   os.FileInfo
+	err  error
+}
+
+type legacyLayerReader struct {
+	root         string
+	result       chan *fileEntry
+	proceed      chan bool
+	currentFile  *os.File
+	backupReader *winio.BackupFileReader
+}
+
+// newLegacyLayerReader returns a new LayerReader that can read the Windows
+// container layer transport format from disk.
+func newLegacyLayerReader(root string) *legacyLayerReader {
+	r := &legacyLayerReader{
+		root:    root,
+		result:  make(chan *fileEntry),
+		proceed: make(chan bool),
+	}
+	go r.walk()
+	return r
+}
+
+func readTombstones(path string) (map[string]([]string), error) {
+	tf, err := os.Open(filepath.Join(path, "tombstones.txt"))
+	if err != nil {
+		return nil, err
+	}
+	defer tf.Close()
+	s := bufio.NewScanner(tf)
+	if !s.Scan() || s.Text() != "\xef\xbb\xbfVersion 1.0" {
+		return nil, errors.New("Invalid tombstones file")
+	}
+
+	ts := make(map[string]([]string))
+	for s.Scan() {
+		t := filepath.Join("Files", s.Text()[1:]) // skip leading `\`
+		dir := filepath.Dir(t)
+		ts[dir] = append(ts[dir], t)
+	}
+	if err = s.Err(); err != nil {
+		return nil, err
+	}
+
+	return ts, nil
+}
+
+func (r *legacyLayerReader) walkUntilCancelled() error {
+	root, err := makeLongAbsPath(r.root)
+	if err != nil {
+		return err
+	}
+
+	r.root = root
+	ts, err := readTombstones(r.root)
+	if err != nil {
+		return err
+	}
+
+	err = filepath.Walk(r.root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if path == r.root || path == filepath.Join(r.root, "tombstones.txt") || strings.HasSuffix(path, ".$wcidirs$") {
+			return nil
+		}
+
+		r.result <- &fileEntry{path, info, nil}
+		if !<-r.proceed {
+			return errorIterationCanceled
+		}
+
+		// List all the tombstones.
+		if info.IsDir() {
+			relPath, err := filepath.Rel(r.root, path)
+			if err != nil {
+				return err
+			}
+			if dts, ok := ts[relPath]; ok {
+				for _, t := range dts {
+					r.result <- &fileEntry{filepath.Join(r.root, t), nil, nil}
+					if !<-r.proceed {
+						return errorIterationCanceled
+					}
+				}
+			}
+		}
+		return nil
+	})
+	if err == errorIterationCanceled {
+		return nil
+	}
+	if err == nil {
+		return io.EOF
+	}
+	return err
+}
+
+func (r *legacyLayerReader) walk() {
+	defer close(r.result)
+	if !<-r.proceed {
+		return
+	}
+
+	err := r.walkUntilCancelled()
+	if err != nil {
+		for {
+			r.result <- &fileEntry{err: err}
+			if !<-r.proceed {
+				return
+			}
+		}
+	}
+}
+
+func (r *legacyLayerReader) reset() {
+	if r.backupReader != nil {
+		r.backupReader.Close()
+		r.backupReader = nil
+	}
+	if r.currentFile != nil {
+		r.currentFile.Close()
+		r.currentFile = nil
+	}
+}
+
+func findBackupStreamSize(r io.Reader) (int64, error) {
+	br := winio.NewBackupStreamReader(r)
+	for {
+		hdr, err := br.Next()
+		if err != nil {
+			if err == io.EOF {
+				err = nil
+			}
+			return 0, err
+		}
+		if hdr.Id == winio.BackupData {
+			return hdr.Size, nil
+		}
+	}
+}
+
+func (r *legacyLayerReader) Next() (path string, size int64, fileInfo *winio.FileBasicInfo, err error) {
+	r.reset()
+	r.proceed <- true
+	fe := <-r.result
+	if fe == nil {
+		err = errors.New("LegacyLayerReader closed")
+		return
+	}
+	if fe.err != nil {
+		err = fe.err
+		return
+	}
+
+	path, err = filepath.Rel(r.root, fe.path)
+	if err != nil {
+		return
+	}
+
+	if fe.fi == nil {
+		// This is a tombstone. Return a nil fileInfo.
+		return
+	}
+
+	if fe.fi.IsDir() && strings.HasPrefix(path, `Files\`) {
+		fe.path += ".$wcidirs$"
+	}
+
+	f, err := openFileOrDir(fe.path, syscall.GENERIC_READ, syscall.OPEN_EXISTING)
+	if err != nil {
+		return
+	}
+	defer func() {
+		if f != nil {
+			f.Close()
+		}
+	}()
+
+	fileInfo, err = winio.GetFileBasicInfo(f)
+	if err != nil {
+		return
+	}
+
+	if !strings.HasPrefix(path, `Files\`) {
+		size = fe.fi.Size()
+		r.backupReader = winio.NewBackupFileReader(f, false)
+		if path == "Hives" || path == "Files" {
+			// The Hives directory has a non-deterministic file time because of the
+			// nature of the import process. Use the times from System_Delta.
+			var g *os.File
+			g, err = os.Open(filepath.Join(r.root, `Hives\System_Delta`))
+			if err != nil {
+				return
+			}
+			attr := fileInfo.FileAttributes
+			fileInfo, err = winio.GetFileBasicInfo(g)
+			g.Close()
+			if err != nil {
+				return
+			}
+			fileInfo.FileAttributes = attr
+		}
+
+		// The creation time and access time get reset for files outside of the Files path.
+		fileInfo.CreationTime = fileInfo.LastWriteTime
+		fileInfo.LastAccessTime = fileInfo.LastWriteTime
+
+	} else {
+		// The file attributes are written before the backup stream.
+		var attr uint32
+		err = binary.Read(f, binary.LittleEndian, &attr)
+		if err != nil {
+			return
+		}
+		fileInfo.FileAttributes = uintptr(attr)
+		beginning := int64(4)
+
+		// Find the accurate file size.
+		if !fe.fi.IsDir() {
+			size, err = findBackupStreamSize(f)
+			if err != nil {
+				err = &os.PathError{Op: "findBackupStreamSize", Path: fe.path, Err: err}
+				return
+			}
+		}
+
+		// Return back to the beginning of the backup stream.
+		_, err = f.Seek(beginning, 0)
+		if err != nil {
+			return
+		}
+	}
+
+	r.currentFile = f
+	f = nil
+	return
+}
+
+func (r *legacyLayerReader) Read(b []byte) (int, error) {
+	if r.backupReader == nil {
+		if r.currentFile == nil {
+			return 0, io.EOF
+		}
+		return r.currentFile.Read(b)
+	}
+	return r.backupReader.Read(b)
+}
+
+func (r *legacyLayerReader) Close() error {
+	r.proceed <- false
+	<-r.result
+	r.reset()
+	return nil
+}
+
+type pendingLink struct {
+	Path, Target string
+}
+
+type legacyLayerWriter struct {
+	root         string
+	parentRoots  []string
+	destRoot     string
+	currentFile  *os.File
+	backupWriter *winio.BackupFileWriter
+	tombstones   []string
+	pathFixed    bool
+	HasUtilityVM bool
+	uvmDi        []dirInfo
+	addedFiles   map[string]bool
+	PendingLinks []pendingLink
+}
+
+// newLegacyLayerWriter returns a LayerWriter that can write the contaler layer
+// transport format to disk.
+func newLegacyLayerWriter(root string, parentRoots []string, destRoot string) *legacyLayerWriter {
+	return &legacyLayerWriter{
+		root:        root,
+		parentRoots: parentRoots,
+		destRoot:    destRoot,
+		addedFiles:  make(map[string]bool),
+	}
+}
+
+func (w *legacyLayerWriter) init() error {
+	if !w.pathFixed {
+		path, err := makeLongAbsPath(w.root)
+		if err != nil {
+			return err
+		}
+		for i, p := range w.parentRoots {
+			w.parentRoots[i], err = makeLongAbsPath(p)
+			if err != nil {
+				return err
+			}
+		}
+		destPath, err := makeLongAbsPath(w.destRoot)
+		if err != nil {
+			return err
+		}
+		w.root = path
+		w.destRoot = destPath
+		w.pathFixed = true
+	}
+	return nil
+}
+
+func (w *legacyLayerWriter) initUtilityVM() error {
+	if !w.HasUtilityVM {
+		err := os.Mkdir(filepath.Join(w.destRoot, `UtilityVM`), 0)
+		if err != nil {
+			return err
+		}
+		// Server 2016 does not support multiple layers for the utility VM, so
+		// clone the utility VM from the parent layer into this layer. Use hard
+		// links to avoid unnecessary copying, since most of the files are
+		// immutable.
+		err = cloneTree(filepath.Join(w.parentRoots[0], `UtilityVM\Files`), filepath.Join(w.destRoot, `UtilityVM\Files`), mutatedUtilityVMFiles)
+		if err != nil {
+			return fmt.Errorf("cloning the parent utility VM image failed: %s", err)
+		}
+		w.HasUtilityVM = true
+	}
+	return nil
+}
+
+func (w *legacyLayerWriter) reset() {
+	if w.backupWriter != nil {
+		w.backupWriter.Close()
+		w.backupWriter = nil
+	}
+	if w.currentFile != nil {
+		w.currentFile.Close()
+		w.currentFile = nil
+	}
+}
+
+// copyFileWithMetadata copies a file using the backup/restore APIs in order to preserve metadata
+func copyFileWithMetadata(srcPath, destPath string, isDir bool) (fileInfo *winio.FileBasicInfo, err error) {
+	createDisposition := uint32(syscall.CREATE_NEW)
+	if isDir {
+		err = os.Mkdir(destPath, 0)
+		if err != nil {
+			return nil, err
+		}
+		createDisposition = syscall.OPEN_EXISTING
+	}
+
+	src, err := openFileOrDir(srcPath, syscall.GENERIC_READ|winio.ACCESS_SYSTEM_SECURITY, syscall.OPEN_EXISTING)
+	if err != nil {
+		return nil, err
+	}
+	defer src.Close()
+	srcr := winio.NewBackupFileReader(src, true)
+	defer srcr.Close()
+
+	fileInfo, err = winio.GetFileBasicInfo(src)
+	if err != nil {
+		return nil, err
+	}
+
+	dest, err := openFileOrDir(destPath, syscall.GENERIC_READ|syscall.GENERIC_WRITE|winio.WRITE_DAC|winio.WRITE_OWNER|winio.ACCESS_SYSTEM_SECURITY, createDisposition)
+	if err != nil {
+		return nil, err
+	}
+	defer dest.Close()
+
+	err = winio.SetFileBasicInfo(dest, fileInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	destw := winio.NewBackupFileWriter(dest, true)
+	defer func() {
+		cerr := destw.Close()
+		if err == nil {
+			err = cerr
+		}
+	}()
+
+	_, err = io.Copy(destw, srcr)
+	if err != nil {
+		return nil, err
+	}
+
+	return fileInfo, nil
+}
+
+// cloneTree clones a directory tree using hard links. It skips hard links for
+// the file names in the provided map and just copies those files.
+func cloneTree(srcPath, destPath string, mutatedFiles map[string]bool) error {
+	var di []dirInfo
+	err := filepath.Walk(srcPath, func(srcFilePath string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		relPath, err := filepath.Rel(srcPath, srcFilePath)
+		if err != nil {
+			return err
+		}
+		destFilePath := filepath.Join(destPath, relPath)
+
+		// Directories, reparse points, and files that will be mutated during
+		// utility VM import must be copied. All other files can be hard linked.
+		isReparsePoint := info.Sys().(*syscall.Win32FileAttributeData).FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0
+		if info.IsDir() || isReparsePoint || mutatedFiles[relPath] {
+			fi, err := copyFileWithMetadata(srcFilePath, destFilePath, info.IsDir())
+			if err != nil {
+				return err
+			}
+			if info.IsDir() && !isReparsePoint {
+				di = append(di, dirInfo{path: destFilePath, fileInfo: *fi})
+			}
+		} else {
+			err = os.Link(srcFilePath, destFilePath)
+			if err != nil {
+				return err
+			}
+		}
+
+		// Don't recurse on reparse points.
+		if info.IsDir() && isReparsePoint {
+			return filepath.SkipDir
+		}
+
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	return reapplyDirectoryTimes(di)
+}
+
+func (w *legacyLayerWriter) Add(name string, fileInfo *winio.FileBasicInfo) error {
+	w.reset()
+	err := w.init()
+	if err != nil {
+		return err
+	}
+
+	if name == `UtilityVM` {
+		return w.initUtilityVM()
+	}
+
+	if strings.HasPrefix(name, `UtilityVM\`) {
+		if !w.HasUtilityVM {
+			return errors.New("missing UtilityVM directory")
+		}
+		if !strings.HasPrefix(name, `UtilityVM\Files\`) && name != `UtilityVM\Files` {
+			return errors.New("invalid UtilityVM layer")
+		}
+		path := filepath.Join(w.destRoot, name)
+		createDisposition := uint32(syscall.OPEN_EXISTING)
+		if (fileInfo.FileAttributes & syscall.FILE_ATTRIBUTE_DIRECTORY) != 0 {
+			st, err := os.Lstat(path)
+			if err != nil && !os.IsNotExist(err) {
+				return err
+			}
+			if st != nil {
+				// Delete the existing file/directory if it is not the same type as this directory.
+				existingAttr := st.Sys().(*syscall.Win32FileAttributeData).FileAttributes
+				if (uint32(fileInfo.FileAttributes)^existingAttr)&(syscall.FILE_ATTRIBUTE_DIRECTORY|syscall.FILE_ATTRIBUTE_REPARSE_POINT) != 0 {
+					if err = os.RemoveAll(path); err != nil {
+						return err
+					}
+					st = nil
+				}
+			}
+			if st == nil {
+				if err = os.Mkdir(path, 0); err != nil {
+					return err
+				}
+			}
+			if fileInfo.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT == 0 {
+				w.uvmDi = append(w.uvmDi, dirInfo{path: path, fileInfo: *fileInfo})
+			}
+		} else {
+			// Overwrite any existing hard link.
+			err = os.Remove(path)
+			if err != nil && !os.IsNotExist(err) {
+				return err
+			}
+			createDisposition = syscall.CREATE_NEW
+		}
+
+		f, err := openFileOrDir(path, syscall.GENERIC_READ|syscall.GENERIC_WRITE|winio.WRITE_DAC|winio.WRITE_OWNER|winio.ACCESS_SYSTEM_SECURITY, createDisposition)
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if f != nil {
+				f.Close()
+				os.Remove(path)
+			}
+		}()
+
+		err = winio.SetFileBasicInfo(f, fileInfo)
+		if err != nil {
+			return err
+		}
+
+		w.backupWriter = winio.NewBackupFileWriter(f, true)
+		w.currentFile = f
+		w.addedFiles[name] = true
+		f = nil
+		return nil
+	}
+
+	path := filepath.Join(w.root, name)
+	if (fileInfo.FileAttributes & syscall.FILE_ATTRIBUTE_DIRECTORY) != 0 {
+		err := os.Mkdir(path, 0)
+		if err != nil {
+			return err
+		}
+		path += ".$wcidirs$"
+	}
+
+	f, err := openFileOrDir(path, syscall.GENERIC_READ|syscall.GENERIC_WRITE, syscall.CREATE_NEW)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if f != nil {
+			f.Close()
+			os.Remove(path)
+		}
+	}()
+
+	strippedFi := *fileInfo
+	strippedFi.FileAttributes = 0
+	err = winio.SetFileBasicInfo(f, &strippedFi)
+	if err != nil {
+		return err
+	}
+
+	if strings.HasPrefix(name, `Hives\`) {
+		w.backupWriter = winio.NewBackupFileWriter(f, false)
+	} else {
+		// The file attributes are written before the stream.
+		err = binary.Write(f, binary.LittleEndian, uint32(fileInfo.FileAttributes))
+		if err != nil {
+			return err
+		}
+	}
+
+	w.currentFile = f
+	w.addedFiles[name] = true
+	f = nil
+	return nil
+}
+
+func (w *legacyLayerWriter) AddLink(name string, target string) error {
+	w.reset()
+	err := w.init()
+	if err != nil {
+		return err
+	}
+
+	var requiredPrefix string
+	var roots []string
+	if prefix := `Files\`; strings.HasPrefix(name, prefix) {
+		requiredPrefix = prefix
+		// Look for cross-layer hard link targets in the parent layers, since
+		// nothing is in the destination path yet.
+		roots = w.parentRoots
+	} else if prefix := `UtilityVM\Files\`; strings.HasPrefix(name, prefix) {
+		requiredPrefix = prefix
+		// Since the utility VM is fully cloned into the destination path
+		// already, look for cross-layer hard link targets directly in the
+		// destination path.
+		roots = []string{w.destRoot}
+	}
+
+	if requiredPrefix == "" || !strings.HasPrefix(target, requiredPrefix) {
+		return errors.New("invalid hard link in layer")
+	}
+
+	// Find to try the target of the link in a previously added file. If that
+	// fails, search in parent layers.
+	var selectedRoot string
+	if _, ok := w.addedFiles[target]; ok {
+		selectedRoot = w.destRoot
+	} else {
+		for _, r := range roots {
+			if _, err = os.Lstat(filepath.Join(r, target)); err != nil {
+				if !os.IsNotExist(err) {
+					return err
+				}
+			} else {
+				selectedRoot = r
+				break
+			}
+		}
+		if selectedRoot == "" {
+			return fmt.Errorf("failed to find link target for '%s' -> '%s'", name, target)
+		}
+	}
+	// The link can't be written until after the ImportLayer call.
+	w.PendingLinks = append(w.PendingLinks, pendingLink{
+		Path:   filepath.Join(w.destRoot, name),
+		Target: filepath.Join(selectedRoot, target),
+	})
+	w.addedFiles[name] = true
+	return nil
+}
+
+func (w *legacyLayerWriter) Remove(name string) error {
+	if strings.HasPrefix(name, `Files\`) {
+		w.tombstones = append(w.tombstones, name[len(`Files\`):])
+	} else if strings.HasPrefix(name, `UtilityVM\Files\`) {
+		err := w.initUtilityVM()
+		if err != nil {
+			return err
+		}
+		// Make sure the path exists; os.RemoveAll will not fail if the file is
+		// already gone, and this needs to be a fatal error for diagnostics
+		// purposes.
+		path := filepath.Join(w.destRoot, name)
+		if _, err := os.Lstat(path); err != nil {
+			return err
+		}
+		err = os.RemoveAll(path)
+		if err != nil {
+			return err
+		}
+	} else {
+		return fmt.Errorf("invalid tombstone %s", name)
+	}
+
+	return nil
+}
+
+func (w *legacyLayerWriter) Write(b []byte) (int, error) {
+	if w.backupWriter == nil {
+		if w.currentFile == nil {
+			return 0, errors.New("closed")
+		}
+		return w.currentFile.Write(b)
+	}
+	return w.backupWriter.Write(b)
+}
+
+func (w *legacyLayerWriter) Close() error {
+	w.reset()
+	err := w.init()
+	if err != nil {
+		return err
+	}
+	tf, err := os.Create(filepath.Join(w.root, "tombstones.txt"))
+	if err != nil {
+		return err
+	}
+	defer tf.Close()
+	_, err = tf.Write([]byte("\xef\xbb\xbfVersion 1.0\n"))
+	if err != nil {
+		return err
+	}
+	for _, t := range w.tombstones {
+		_, err = tf.Write([]byte(filepath.Join(`\`, t) + "\n"))
+		if err != nil {
+			return err
+		}
+	}
+	if w.HasUtilityVM {
+		err = reapplyDirectoryTimes(w.uvmDi)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}