// applyLayerHandler parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`. Returns the size in bytes of the
// contents of the layer.
func applyLayerHandler(dest string, layer archive.Reader, decompress bool) (size int64, err error) {
	dest = filepath.Clean(dest)

	// Ensure it is a Windows-style volume path
	dest = longpath.AddPrefix(dest)

	if decompress {
		decompressed, err := archive.DecompressStream(layer)
		if err != nil {
			return 0, err
		}
		defer decompressed.Close()

		layer = decompressed
	}

	tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract")
	if err != nil {
		return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err)
	}

	s, err := archive.UnpackLayer(dest, layer)
	os.RemoveAll(tmpDir)
	if err != nil {
		return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest)
	}

	return s, nil
}
Exemple #2
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func applyLayer() {
	runtime.LockOSThread()
	flag.Parse()

	if err := chroot(flag.Arg(0)); err != nil {
		fatal(err)
	}

	// We need to be able to set any perms
	oldmask := syscall.Umask(0)
	defer syscall.Umask(oldmask)
	tmpDir, err := ioutil.TempDir("/", "temp-docker-extract")
	if err != nil {
		fatal(err)
	}

	os.Setenv("TMPDIR", tmpDir)
	size, err := archive.UnpackLayer("/", os.Stdin)
	os.RemoveAll(tmpDir)
	if err != nil {
		fatal(err)
	}

	encoder := json.NewEncoder(os.Stdout)
	if err := encoder.Encode(applyLayerResponse{size}); err != nil {
		fatal(fmt.Errorf("unable to encode layerSize JSON: %s", err))
	}

	flush(os.Stdout)
	flush(os.Stdin)
	os.Exit(0)
}
Exemple #3
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// applyLayer is the entry-point for docker-applylayer on re-exec. This is not
// used on Windows as it does not support chroot, hence no point sandboxing
// through chroot and rexec.
func applyLayer() {

	var (
		tmpDir  string
		err     error
		options *archive.TarOptions
	)
	runtime.LockOSThread()
	flag.Parse()

	inUserns := rsystem.RunningInUserNS()
	if err := chroot(flag.Arg(0)); err != nil {
		fatal(err)
	}

	// We need to be able to set any perms
	oldmask, err := system.Umask(0)
	defer system.Umask(oldmask)
	if err != nil {
		fatal(err)
	}

	if err := json.Unmarshal([]byte(os.Getenv("OPT")), &options); err != nil {
		fatal(err)
	}

	if inUserns {
		options.InUserNS = true
	}

	if tmpDir, err = ioutil.TempDir("/", "temp-docker-extract"); err != nil {
		fatal(err)
	}

	os.Setenv("TMPDIR", tmpDir)
	size, err := archive.UnpackLayer("/", os.Stdin, options)
	os.RemoveAll(tmpDir)
	if err != nil {
		fatal(err)
	}

	encoder := json.NewEncoder(os.Stdout)
	if err := encoder.Encode(applyLayerResponse{size}); err != nil {
		fatal(fmt.Errorf("unable to encode layerSize JSON: %s", err))
	}

	if _, err := flush(os.Stdin); err != nil {
		fatal(err)
	}

	os.Exit(0)
}
Exemple #4
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func applyLayer() {

	var (
		root   = "/"
		tmpDir = ""
		err    error
	)

	runtime.LockOSThread()
	flag.Parse()

	if runtime.GOOS != "windows" {
		if err := chroot(flag.Arg(0)); err != nil {
			fatal(err)
		}

		// We need to be able to set any perms
		oldmask, err := system.Umask(0)
		defer system.Umask(oldmask)
		if err != nil {
			fatal(err)
		}
	} else {
		// As Windows does not support chroot or umask, we use the directory
		// passed in which will be <pathto>\docker-buildnnnnnnnn instead of
		// the 'chroot-root', "/"
		root = flag.Arg(0)
	}

	if tmpDir, err = ioutil.TempDir(root, "temp-docker-extract"); err != nil {
		fatal(err)
	}

	os.Setenv("TMPDIR", tmpDir)
	size, err := archive.UnpackLayer(root, os.Stdin)
	os.RemoveAll(tmpDir)
	if err != nil {
		fatal(err)
	}

	encoder := json.NewEncoder(os.Stdout)
	if err := encoder.Encode(applyLayerResponse{size}); err != nil {
		fatal(fmt.Errorf("unable to encode layerSize JSON: %s", err))
	}

	flush(os.Stdout)
	flush(os.Stdin)
	os.Exit(0)
}
Exemple #5
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func ApplyLayer(dest string, layer archive.ArchiveReader) (size int64, err error) {
	dest = filepath.Clean(dest)
	decompressed, err := archive.DecompressStream(layer)
	if err != nil {
		return 0, err
	}
	defer decompressed.Close()

	tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract")
	if err != nil {
		return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err)
	}

	s, err := archive.UnpackLayer(dest, decompressed)
	os.RemoveAll(tmpDir)
	if err != nil {
		return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest)
	}

	return s, nil
}