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Merge pull request #96 from cyphar/add-unpriv-walking

Browse source 
walk: implement "unprivileged manifest generation"
This commit is contained in:
Vincent Batts 2016-12-14 13:32:14 -05:00 committed by GitHub
commit 0dc720e861
10 changed files with 272 additions and 64 deletions
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15
check.go
View file

@ -5,22 +5,17 @@ package mtree
// If keywords is nil, the check all present in the DirectoryHierarchy
//
// This is equivalent to creating a new DirectoryHierarchy with Walk(root, nil,
// keywords) and then doing a Compare(dh, newDh, keywords).
func Check(root string, dh *DirectoryHierarchy, keywords []Keyword) ([]InodeDelta, error) {
// keywords, fs) and then doing a Compare(dh, newDh, keywords).
func Check(root string, dh *DirectoryHierarchy, keywords []Keyword, fs FsEval) ([]InodeDelta, error) {
if keywords == nil {
used := dh.UsedKeywords()
newDh, err := Walk(root, nil, used)
if err != nil {
return nil, err
}
return Compare(dh, newDh, used)
keywords = dh.UsedKeywords()
}
newDh, err := Walk(root, nil, keywords)
newDh, err := Walk(root, nil, keywords, fs)
if err != nil {
return nil, err
}
// TODO: Handle tar_time, if necessary.
return Compare(dh, newDh, keywords)
}

34
check_test.go
View file

@ -12,12 +12,12 @@ import (
// simple walk of current directory, and imediately check it.
// may not be parallelizable.
func TestCheck(t *testing.T) {
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
res, err := Check(".", dh, nil)
res, err := Check(".", dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -43,13 +43,13 @@ func TestCheckKeywords(t *testing.T) {
}
// Walk this tempdir
dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
// Check for sanity. This ought to pass.
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -64,7 +64,7 @@ func TestCheckKeywords(t *testing.T) {
}
// Check again. This ought to fail.
res, err = Check(dir, dh, nil)
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -76,7 +76,7 @@ func TestCheckKeywords(t *testing.T) {
}
// Check again, but only sha1 and mode. This ought to pass.
res, err = Check(dir, dh, []Keyword{"sha1", "mode"})
res, err = Check(dir, dh, []Keyword{"sha1", "mode"}, nil)
if err != nil {
t.Fatal(err)
}
@ -86,12 +86,12 @@ func TestCheckKeywords(t *testing.T) {
}
func ExampleCheck() {
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
// handle error ...
}
res, err := Check(".", dh, nil)
res, err := Check(".", dh, nil, nil)
if err != nil {
// handle error ...
}
@ -103,11 +103,11 @@ func ExampleCheck() {
// Tests default action for evaluating a symlink, which is just to compare the
// link itself, not to follow it
func TestDefaultBrokenLink(t *testing.T) {
dh, err := Walk("./testdata/dirwithbrokenlink", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk("./testdata/dirwithbrokenlink", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
res, err := Check("./testdata/dirwithbrokenlink", dh, nil)
res, err := Check("./testdata/dirwithbrokenlink", dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -155,7 +155,7 @@ func TestTimeComparison(t *testing.T) {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -203,13 +203,13 @@ func TestTarTime(t *testing.T) {
keywords := dh.UsedKeywords()
// make sure "time" keyword works
_, err = Check(dir, dh, keywords)
_, err = Check(dir, dh, keywords, nil)
if err != nil {
t.Error(err)
}
// make sure tar_time wins
res, err := Check(dir, dh, append(keywords, "tar_time"))
res, err := Check(dir, dh, append(keywords, "tar_time"), nil)
if err != nil {
t.Error(err)
}
@ -254,7 +254,7 @@ func TestIgnoreComments(t *testing.T) {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -274,7 +274,7 @@ func TestIgnoreComments(t *testing.T) {
`
dh, err = ParseSpec(bytes.NewBufferString(spec))
res, err = Check(dir, dh, nil)
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -306,11 +306,11 @@ func TestCheckNeedsEncoding(t *testing.T) {
t.Error(err)
}
dh, err := Walk(dir, nil, DefaultKeywords)
dh, err := Walk(dir, nil, DefaultKeywords, nil)
if err != nil {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}

2
cmd/gomtree/main.go
View file

@ -236,7 +236,7 @@ func app() error {
}
} else {
// with a root directory
stateDh, err = mtree.Walk(rootPath, excludes, currentKeywords)
stateDh, err = mtree.Walk(rootPath, excludes, currentKeywords, nil)
if err != nil {
return err
}

22
compare_test.go
View file

@ -15,12 +15,12 @@ import (
// simple walk of current directory, and imediately check it.
// may not be parallelizable.
func TestCompare(t *testing.T) {
old, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
old, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
new, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
new, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -59,7 +59,7 @@ func TestCompareModified(t *testing.T) {
}
// Walk the current state.
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -70,7 +70,7 @@ func TestCompareModified(t *testing.T) {
}
// Walk the new state.
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -140,7 +140,7 @@ func TestCompareMissing(t *testing.T) {
}
// Walk the current state.
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -159,7 +159,7 @@ func TestCompareMissing(t *testing.T) {
}
// Walk the new state.
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -215,7 +215,7 @@ func TestCompareExtra(t *testing.T) {
defer os.RemoveAll(dir)
// Walk the current state.
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -237,7 +237,7 @@ func TestCompareExtra(t *testing.T) {
}
// Walk the new state.
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -309,7 +309,7 @@ func TestCompareKeys(t *testing.T) {
}
// Walk the current state.
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -320,7 +320,7 @@ func TestCompareKeys(t *testing.T) {
}
// Walk the new state.
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
new, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -382,7 +382,7 @@ func TestTarCompare(t *testing.T) {
}
// Walk the current state.
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
old, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}

1
creator.go
View file

@ -3,6 +3,7 @@ package mtree
// dhCreator is used in when building a DirectoryHierarchy
type dhCreator struct {
DH *DirectoryHierarchy
fs FsEval
curSet *Entry
curDir *Entry
curEnt *Entry

54
fseval.go Normal file
View file

@ -0,0 +1,54 @@
package mtree
import "os"
// FsEval is a mock-friendly method of specifying to go-mtree how to carry out
// filesystem operations such as opening files and the like. The semantics of
// all of these wrappers MUST be identical to the semantics described here.
type FsEval interface {
// Open must have the same semantics as os.Open.
Open(path string) (*os.File, error)
// Lstat must have the same semantics as os.Lstat.
Lstat(path string) (os.FileInfo, error)
// Readdir must have the same semantics as calling os.Open on the given
// path and then returning the result of (*os.File).Readdir(-1).
Readdir(path string) ([]os.FileInfo, error)
// KeywordFunc must return a wrapper around the provided function (in other
// words, the returned function must refer to the same keyword).
KeywordFunc(fn KeywordFunc) KeywordFunc
}
// DefaultFsEval is the default implementation of FsEval (and is the default
// used if a nil interface is passed to any mtree function). It does not modify
// or wrap any of the methods (they all just call out to os.*).
type DefaultFsEval struct{}
// Open must have the same semantics as os.Open.
func (fs DefaultFsEval) Open(path string) (*os.File, error) {
return os.Open(path)
}
// Lstat must have the same semantics as os.Lstat.
func (fs DefaultFsEval) Lstat(path string) (os.FileInfo, error) {
return os.Lstat(path)
}
// Readdir must have the same semantics as calling os.Open on the given
// path and then returning the result of (*os.File).Readdir(-1).
func (fs DefaultFsEval) Readdir(path string) ([]os.FileInfo, error) {
fh, err := os.Open(path)
if err != nil {
return nil, err
}
defer fh.Close()
return fh.Readdir(-1)
}
// KeywordFunc must return a wrapper around the provided function (in other
// words, the returned function must refer to the same keyword).
func (fs DefaultFsEval) KeywordFunc(fn KeywordFunc) KeywordFunc {
return fn
}

160
fseval_test.go Normal file
View file

@ -0,0 +1,160 @@
package mtree
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
)
var mockTime = time.Unix(1337888823, 88288518233)
// Here be some dodgy testing. In particular, we have to mess around with some
// of the FsEval functions. In particular, we change all of the FileInfos to a
// different value.
type mockFileInfo struct {
os.FileInfo
}
func (fi mockFileInfo) Mode() os.FileMode {
return os.FileMode(fi.FileInfo.Mode() | 0777)
}
func (fi mockFileInfo) ModTime() time.Time {
return mockTime
}
type MockFsEval struct {
open, lstat, readdir, keywordFunc int
}
// Open must have the same semantics as os.Open.
func (fs *MockFsEval) Open(path string) (*os.File, error) {
fs.open++
return os.Open(path)
}
// Lstat must have the same semantics as os.Lstat.
func (fs *MockFsEval) Lstat(path string) (os.FileInfo, error) {
fs.lstat++
fi, err := os.Lstat(path)
return mockFileInfo{fi}, err
}
// Readdir must have the same semantics as calling os.Open on the given
// path and then returning the result of (*os.File).Readdir(-1).
func (fs *MockFsEval) Readdir(path string) ([]os.FileInfo, error) {
fs.readdir++
fh, err := os.Open(path)
if err != nil {
return nil, err
}
defer fh.Close()
fis, err := fh.Readdir(-1)
if err != nil {
return nil, err
}
for idx := range fis {
fis[idx] = mockFileInfo{fis[idx]}
}
return fis, nil
}
// KeywordFunc must return a wrapper around the provided function (in other
// words, the returned function must refer to the same keyword).
func (fs *MockFsEval) KeywordFunc(fn KeywordFunc) KeywordFunc {
fs.keywordFunc++
return fn
}
func TestCheckFsEval(t *testing.T) {
dir, err := ioutil.TempDir("", "test-check-fs-eval")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir) // clean up
content := []byte("If you hide your ignorance, no one will hit you and you'll never learn.")
tmpfn := filepath.Join(dir, "tmpfile")
if err := ioutil.WriteFile(tmpfn, content, 0451); err != nil {
t.Fatal(err)
}
// Walk this tempdir
mock := &MockFsEval{}
dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), mock)
if err != nil {
t.Fatal(err)
}
// Make sure that mock functions have been called.
if mock.open == 0 {
t.Errorf("mock.Open not called")
}
if mock.lstat == 0 {
t.Errorf("mock.Lstat not called")
}
if mock.readdir == 0 {
t.Errorf("mock.Readdir not called")
}
if mock.keywordFunc == 0 {
t.Errorf("mock.KeywordFunc not called")
}
// Check for sanity. This ought to pass.
mock = &MockFsEval{}
res, err := Check(dir, dh, nil, mock)
if err != nil {
t.Fatal(err)
}
if len(res) > 0 {
t.Errorf("%#v", res)
}
// Make sure that mock functions have been called.
if mock.open == 0 {
t.Errorf("mock.Open not called")
}
if mock.lstat == 0 {
t.Errorf("mock.Lstat not called")
}
if mock.readdir == 0 {
t.Errorf("mock.Readdir not called")
}
if mock.keywordFunc == 0 {
t.Errorf("mock.KeywordFunc not called")
}
// This should FAIL.
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
if len(res) == 0 {
t.Errorf("expected Check to fail")
}
// Modify the metadata so you can get the right output.
if err := os.Chmod(tmpfn, 0777); err != nil {
t.Fatal(err)
}
if err := os.Chtimes(tmpfn, mockTime, mockTime); err != nil {
t.Fatal(err)
}
if err := os.Chmod(dir, 0777); err != nil {
t.Fatal(err)
}
if err := os.Chtimes(dir, mockTime, mockTime); err != nil {
t.Fatal(err)
}
// It should now succeed.
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
if len(res) > 0 {
t.Errorf("%#v", res)
}
}

10
tar_test.go
View file

@ -26,7 +26,7 @@ func ExampleStreamer() {
// handle error ...
}
res, err := Check("/tmp/dir/", dh, nil)
res, err := Check("/tmp/dir/", dh, nil, nil)
if err != nil {
// handle error ...
}
@ -145,7 +145,7 @@ func TestArchiveCreation(t *testing.T) {
}
// Test the tar manifest against the actual directory
res, err := Check("./testdata/collection", tdh, []Keyword{"sha1"})
res, err := Check("./testdata/collection", tdh, []Keyword{"sha1"}, nil)
if err != nil {
t.Fatal(err)
}
@ -170,7 +170,7 @@ func TestArchiveCreation(t *testing.T) {
}
// Validate the directory manifest against the archive
dh, err := Walk("./testdata/collection", nil, []Keyword{"sha1"})
dh, err := Walk("./testdata/collection", nil, []Keyword{"sha1"}, nil)
if err != nil {
t.Fatal(err)
}
@ -224,7 +224,7 @@ func TestTreeTraversal(t *testing.T) {
}
// top-level "." directory will contain contents of traversal.tar
res, err = Check("./testdata/.", tdh, []Keyword{"sha1"})
res, err = Check("./testdata/.", tdh, []Keyword{"sha1"}, nil)
if err != nil {
t.Fatal(err)
}
@ -262,7 +262,7 @@ func TestTreeTraversal(t *testing.T) {
}
// Implied top-level "." directory will contain the contents of singlefile.tar
res, err = Check("./testdata/.", tdh, []Keyword{"sha1"})
res, err = Check("./testdata/.", tdh, []Keyword{"sha1"}, nil)
if err != nil {
t.Fatal(err)
}

34
walk.go
View file

@ -26,8 +26,11 @@ var defaultSetKeywords = []KeyVal{"type=file", "nlink=1", "flags=none", "mode=06
// Walk from root directory and assemble the DirectoryHierarchy. excludes
// provided are used to skip paths. keywords are the set to collect from the
// walked paths. The recommended default list is DefaultKeywords.
func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHierarchy, error) {
creator := dhCreator{DH: &DirectoryHierarchy{}}
func Walk(root string, excludes []ExcludeFunc, keywords []Keyword, fsEval FsEval) (*DirectoryHierarchy, error) {
if fsEval == nil {
fsEval = DefaultFsEval{}
}
creator := dhCreator{DH: &DirectoryHierarchy{}, fs: fsEval}
// insert signature and metadata comments first (user, machine, tree, date)
for _, e := range signatureEntries(root) {
e.Pos = len(creator.DH.Entries)
@ -88,7 +91,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
err := func() error {
var r io.Reader
if info.Mode().IsRegular() {
fh, err := os.Open(path)
fh, err := creator.fs.Open(path)
if err != nil {
return err
}
@ -99,7 +102,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
if !ok {
return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
}
if str, err := keywordFunc(path, info, r); err == nil && str != "" {
if str, err := creator.fs.KeywordFunc(keywordFunc)(path, info, r); err == nil && str != "" {
e.Keywords = append(e.Keywords, str)
} else if err != nil {
return err
@ -119,7 +122,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
err := func() error {
var r io.Reader
if info.Mode().IsRegular() {
fh, err := os.Open(path)
fh, err := creator.fs.Open(path)
if err != nil {
return err
}
@ -130,7 +133,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
if !ok {
return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
}
str, err := keywordFunc(path, info, r)
str, err := creator.fs.KeywordFunc(keywordFunc)(path, info, r)
if err != nil {
return err
}
@ -177,7 +180,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
err := func() error {
var r io.Reader
if info.Mode().IsRegular() {
fh, err := os.Open(path)
fh, err := creator.fs.Open(path)
if err != nil {
return err
}
@ -188,7 +191,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
if !ok {
return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
}
str, err := keywordFunc(path, info, r)
str, err := creator.fs.KeywordFunc(keywordFunc)(path, info, r)
if err != nil {
return err
}
@ -227,7 +230,7 @@ func Walk(root string, excludes []ExcludeFunc, keywords []Keyword) (*DirectoryHi
// large directories Walk can be inefficient.
// Walk does not follow symbolic links.
func startWalk(c *dhCreator, root string, walkFn filepath.WalkFunc) error {
info, err := os.Lstat(root)
info, err := c.fs.Lstat(root)
if err != nil {
return walkFn(root, nil, err)
}
@ -248,14 +251,14 @@ func walk(c *dhCreator, path string, info os.FileInfo, walkFn filepath.WalkFunc)
return nil
}
names, err := readOrderedDirNames(path)
names, err := readOrderedDirNames(c, path)
if err != nil {
return walkFn(path, info, err)
}
for _, name := range names {
filename := filepath.Join(path, name)
fileInfo, err := os.Lstat(filename)
fileInfo, err := c.fs.Lstat(filename)
if err != nil {
if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
return err
@ -282,13 +285,8 @@ func walk(c *dhCreator, path string, info os.FileInfo, walkFn filepath.WalkFunc)
// readOrderedDirNames reads the directory and returns a sorted list of all
// entries with non-directories first, followed by directories.
func readOrderedDirNames(dirname string) ([]string, error) {
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
infos, err := f.Readdir(-1)
f.Close()
func readOrderedDirNames(c *dhCreator, dirname string) ([]string, error) {
infos, err := c.fs.Readdir(dirname)
if err != nil {
return nil, err
}

4
walk_test.go
View file

@ -7,7 +7,7 @@ import (
)
func TestWalk(t *testing.T) {
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
@ -37,7 +37,7 @@ func TestWalk(t *testing.T) {
}
func TestWalkDirectory(t *testing.T) {
dh, err := Walk(".", []ExcludeFunc{ExcludeNonDirectories}, []Keyword{"type"})
dh, err := Walk(".", []ExcludeFunc{ExcludeNonDirectories}, []Keyword{"type"}, nil)
if err != nil {
t.Fatal(err)
}