Exemple #1
0
// Untar reads a stream of bytes from `archive`, parses it as a tar archive,
// and unpacks it into the directory at `dest`.
// The archive may be compressed with one of the following algorithms:
//  identity (uncompressed), gzip, bzip2, xz.
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 := system.MkdirAll(dest, 0777); err != nil {
			glog.Error(err.Error())
			return err
		}
	}

	decompressedArchive, err := archive.DecompressStream(tarArchive)
	if err != nil {
		glog.Error(err.Error())
		return err
	}
	defer decompressedArchive.Close()

	return invokeUnpack(decompressedArchive, dest, options)
}
Exemple #2
0
func (b *Builder) readContext(context io.Reader) error {
	tmpdirPath, err := ioutil.TempDir("", "docker-build")
	if err != nil {
		glog.Error(err.Error())
		return err
	}

	decompressedStream, err := archive.DecompressStream(context)
	if err != nil {
		glog.Error(err.Error())
		return err
	}

	if b.context, err = tarsum.NewTarSum(decompressedStream, true, tarsum.Version0); err != nil {
		glog.Error(err.Error())
		return err
	}

	if err := chrootarchive.Untar(b.context, tmpdirPath, nil); err != nil {
		glog.Error(err.Error())
		return err
	}

	b.contextPath = tmpdirPath
	return nil
}
Exemple #3
0
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()

	cmd := reexec.Command("docker-applyLayer", dest)
	cmd.Stdin = decompressed

	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)
	}
	fmt.Printf("\n\nApplyLayer stdout: %s stderr: %s\n\n", 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
}