Exemple #1
0
func exportChanges(rootfs string, diff []byte) (archive.Archive, error) {
	var changes []archive.Change

	scanner := bufio.NewScanner(bytes.NewReader(diff))
	for scanner.Scan() {
		line := scanner.Text()
		dType := strings.SplitN(line, "\t", 2)[0]
		path := "/" + strings.SplitN(line, "\t", 2)[1] // important to consider the / for ExportChanges

		change := archive.Change{Path: path}

		switch dType {
		case DIFF_MODIFIED:
			change.Kind = archive.ChangeModify
		case DIFF_ADDED:
			change.Kind = archive.ChangeAdd
		case DIFF_DELETED:
			change.Kind = archive.ChangeDelete
		}

		changes = append(changes, change)

		if err := scanner.Err(); err != nil {
			return nil, err
		}
	}
	if len(changes) == 0 {
		return nil, ErrNoChange
	}
	return archive.ExportChanges(rootfs, changes)
}
Exemple #2
0
func diff(id, parent string) (diff archive.Archive, err error) {

	// create pod

	// start or replace pod
	glog.Infof("Diff between %s and %s", id, parent)
	layerFs := "/tmp/test1"
	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			return err
		}), nil
	}

	parentFs := "/tmp/test2"

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		return err
	}), nil
}
Exemple #3
0
func Diff(mainPath, parentPath string) (arch io.ReadCloser, err error) {
	changes, err := archive.ChangesDirs(mainPath, parentPath)
	if err != nil {
		return nil, err
	}

	return archive.ExportChanges(mainPath, changes, nil, nil)
}
Exemple #4
0
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (gdw *NaiveDiffDriver) Diff(id, parent string) (arch archive.Archive, err error) {
	startTime := time.Now()
	driver := gdw.ProtoDriver

	layerFs, err := driver.Get(id, "")
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			driver.Put(id)
		}
	}()

	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			driver.Put(id)
			return err
		}), nil
	}

	parentFs, err := driver.Get(parent, "")
	if err != nil {
		return nil, err
	}
	defer driver.Put(parent)

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes, gdw.uidMaps, gdw.gidMaps)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(id)

		// NaiveDiffDriver compares file metadata with parent layers. Parent layers
		// are extracted from tar's with full second precision on modified time.
		// We need this hack here to make sure calls within same second receive
		// correct result.
		time.Sleep(startTime.Truncate(time.Second).Add(time.Second).Sub(time.Now()))
		return err
	}), nil
}
func main() {
	flag.Usage = func() {
		fmt.Println("Produce a tar from comparing two directory paths. By default a demo tar is created of around 200 files (including hardlinks)")
		fmt.Printf("%s [OPTIONS]\n", os.Args[0])
		flag.PrintDefaults()
	}
	flag.Parse()
	log.Out = os.Stderr
	if (len(os.Getenv("DEBUG")) > 0) || *flDebug {
		logrus.SetLevel(logrus.DebugLevel)
	}
	var newDir, oldDir string

	if len(*flNewDir) == 0 {
		var err error
		newDir, err = ioutil.TempDir("", "docker-test-newDir")
		if err != nil {
			log.Fatal(err)
		}
		defer os.RemoveAll(newDir)
		if _, err := prepareUntarSourceDirectory(100, newDir, true); err != nil {
			log.Fatal(err)
		}
	} else {
		newDir = *flNewDir
	}

	if len(*flOldDir) == 0 {
		oldDir, err := ioutil.TempDir("", "docker-test-oldDir")
		if err != nil {
			log.Fatal(err)
		}
		defer os.RemoveAll(oldDir)
	} else {
		oldDir = *flOldDir
	}

	changes, err := archive.ChangesDirs(newDir, oldDir)
	if err != nil {
		log.Fatal(err)
	}

	a, err := archive.ExportChanges(newDir, changes)
	if err != nil {
		log.Fatal(err)
	}
	defer a.Close()

	i, err := io.Copy(os.Stdout, a)
	if err != nil && err != io.EOF {
		log.Fatal(err)
	}
	fmt.Fprintf(os.Stderr, "wrote archive of %d bytes", i)
}
Exemple #6
0
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (gdw *naiveDiffDriver) Diff(id, parent string) (arch archive.Archive, err error) {
	driver := gdw.ProtoDriver

	layerFs, err := driver.Get(id, "")
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			driver.Put(id)
		}
	}()

	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			driver.Put(id)
			return err
		}), nil
	}

	parentFs, err := driver.Get(parent, "")
	if err != nil {
		return nil, err
	}
	defer driver.Put(parent)

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(id)
		return err
	}), nil
}
Exemple #7
0
func (r *gitRepo) exportChangeSet(br branch) (archive.Archive, error) {
	currentBr, err := r.currentBranch()
	if err != nil {
		return nil, err
	}

	_, err = r.checkout(br)
	if err != nil {
		return nil, err
	}

	defer func() {
		r.checkout(currentBr)
	}()

	branches, err := r.branch()
	if err != nil {
		return nil, err
	}

	switch br.number() {
	case 0:
		changes, err := archive.ChangesDirs(r.Path, "")
		if err != nil {
			return nil, err
		}
		var curatedChanges []archive.Change
		for _, ch := range changes {
			if !strings.HasPrefix(ch.Path, "/.git") {
				curatedChanges = append(curatedChanges, ch)
			}
		}
		return archive.ExportChanges(r.Path, curatedChanges)
	default:
		parentBr := branches[br.number()-1]
		diff, _ := r.diff(parentBr, br)
		return exportChanges(r.Path, diff)
	}
}