Beispiel #1
0
// Handler for teasing out the automatic decompression
func untarHandler(tarArchive io.Reader, dest string, options *archive.TarOptions, decompress bool) error {

	if tarArchive == nil {
		return fmt.Errorf("Empty archive")
	}
	if options == nil {
		options = &archive.TarOptions{}
	}
	if options.ExcludePatterns == nil {
		options.ExcludePatterns = []string{}
	}

	dest = filepath.Clean(dest)
	if _, err := os.Stat(dest); os.IsNotExist(err) {
		if err := system.MkdirAll(dest, 0777); err != nil {
			return err
		}
	}

	r := ioutil.NopCloser(tarArchive)
	if decompress {
		decompressedArchive, err := archive.DecompressStream(tarArchive)
		if err != nil {
			return err
		}
		defer decompressedArchive.Close()
		r = decompressedArchive
	}

	return invokeUnpack(r, dest, options)
}
Beispiel #2
0
func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
	if tarArchive == nil {
		return fmt.Errorf("Empty archive")
	}
	if options == nil {
		options = &archive.TarOptions{}
	}
	if options.ExcludePatterns == nil {
		options.ExcludePatterns = []string{}
	}

	dest = filepath.Clean(dest)
	if _, err := os.Stat(dest); os.IsNotExist(err) {
		if err := os.MkdirAll(dest, 0777); err != nil {
			return err
		}
	}

	// We can't pass the exclude list directly via cmd line
	// because we easily overrun the shell max argument list length
	// when the full image list is passed (e.g. when this is used
	// by `docker load`). Instead we will add the JSON marshalled
	// and placed in the env, which has significantly larger
	// max size
	data, err := json.Marshal(options)
	if err != nil {
		return fmt.Errorf("Untar json encode: %v", err)
	}
	decompressedArchive, err := archive.DecompressStream(tarArchive)
	if err != nil {
		return err
	}
	defer decompressedArchive.Close()

	cmd := reexec.Command("docker-untar", dest)
	cmd.Stdin = decompressedArchive
	cmd.Env = append(cmd.Env, fmt.Sprintf("OPT=%s", data))
	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("Untar %s %s", err, out)
	}
	return nil
}
Beispiel #3
0
// 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, options *archive.TarOptions, decompress bool) (size int64, err error) {
	dest = filepath.Clean(dest)
	if decompress {
		decompressed, err := archive.DecompressStream(layer)
		if err != nil {
			return 0, err
		}
		defer decompressed.Close()

		layer = decompressed
	}
	if options == nil {
		options = &archive.TarOptions{}
	}
	if options.ExcludePatterns == nil {
		options.ExcludePatterns = []string{}
	}

	data, err := json.Marshal(options)
	if err != nil {
		return 0, fmt.Errorf("ApplyLayer json encode: %v", err)
	}

	cmd := reexec.Command("docker-applyLayer", dest)
	cmd.Stdin = layer
	cmd.Env = append(cmd.Env, fmt.Sprintf("OPT=%s", data))

	outBuf, errBuf := new(bytes.Buffer), new(bytes.Buffer)
	cmd.Stdout, cmd.Stderr = outBuf, errBuf

	if err = cmd.Run(); err != nil {
		return 0, fmt.Errorf("ApplyLayer %s stdout: %s stderr: %s", err, outBuf, errBuf)
	}

	// Stdout should be a valid JSON struct representing an applyLayerResponse.
	response := applyLayerResponse{}
	decoder := json.NewDecoder(outBuf)
	if err = decoder.Decode(&response); err != nil {
		return 0, fmt.Errorf("unable to decode ApplyLayer JSON response: %s", err)
	}

	return response.LayerSize, nil
}
Beispiel #4
0
func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
	if tarArchive == nil {
		return fmt.Errorf("Empty archive")
	}
	if options == nil {
		options = &archive.TarOptions{}
	}
	if options.Excludes == nil {
		options.Excludes = []string{}
	}

	var (
		buf bytes.Buffer
		enc = json.NewEncoder(&buf)
	)
	if err := enc.Encode(options); err != nil {
		return fmt.Errorf("Untar json encode: %v", err)
	}
	if _, err := os.Stat(dest); os.IsNotExist(err) {
		if err := os.MkdirAll(dest, 0777); err != nil {
			return err
		}
	}
	dest = filepath.Clean(dest)
	decompressedArchive, err := archive.DecompressStream(tarArchive)
	if err != nil {
		return err
	}
	defer decompressedArchive.Close()

	cmd := reexec.Command("docker-untar", dest, buf.String())
	cmd.Stdin = decompressedArchive
	out, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("Untar %s %s", err, out)
	}
	return nil
}