Golang archive.Untar函數代碼示例

func (b *buildFile) Build(context io.Reader) (string, error) {
	// FIXME: @creack "name" is a terrible variable name
	name, err := ioutil.TempDir("", "docker-build")
	if err != nil {
		return "", err
	}
	if err := archive.Untar(context, name, nil); err != nil {
		return "", err
	}
	defer os.RemoveAll(name)
	b.context = name
	filename := path.Join(name, "Dockerfile")
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		return "", fmt.Errorf("Can't build a directory with no Dockerfile")
	}
	fileBytes, err := ioutil.ReadFile(filename)
	if err != nil {
		return "", err
	}
	dockerfile := string(fileBytes)
	dockerfile = lineContinuation.ReplaceAllString(dockerfile, "")
	stepN := 0
	for _, line := range strings.Split(dockerfile, "\n") {
		line = strings.Trim(strings.Replace(line, "\t", " ", -1), " \t\r\n")
		// Skip comments and empty line
		if len(line) == 0 || line[0] == '#' {
			continue
		}
		tmp := strings.SplitN(line, " ", 2)
		if len(tmp) != 2 {
			return "", fmt.Errorf("Invalid Dockerfile format")
		}
		instruction := strings.ToLower(strings.Trim(tmp[0], " "))
		arguments := strings.Trim(tmp[1], " ")

		method, exists := reflect.TypeOf(b).MethodByName("Cmd" + strings.ToUpper(instruction[:1]) + strings.ToLower(instruction[1:]))
		if !exists {
			fmt.Fprintf(b.errStream, "# Skipping unknown instruction %s\n", strings.ToUpper(instruction))
			continue
		}

		stepN += 1
		fmt.Fprintf(b.outStream, "Step %d : %s %s\n", stepN, strings.ToUpper(instruction), arguments)

		ret := method.Func.Call([]reflect.Value{reflect.ValueOf(b), reflect.ValueOf(arguments)})[0].Interface()
		if ret != nil {
			return "", ret.(error)
		}

		fmt.Fprintf(b.outStream, " ---> %s\n", utils.TruncateID(b.image))
	}
	if b.image != "" {
		fmt.Fprintf(b.outStream, "Successfully built %s\n", utils.TruncateID(b.image))
		if b.rm {
			b.clearTmp(b.tmpContainers)
		}
		return b.image, nil
	}
	return "", fmt.Errorf("No image was generated. This may be because the Dockerfile does not, like, do anything.\n")
}

func (b *buildFile) Build(context io.Reader) (string, error) {
	tmpdirPath, err := ioutil.TempDir("", "docker-build")
	if err != nil {
		return "", err
	}

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

	b.context = &utils.TarSum{Reader: decompressedStream, DisableCompression: true}
	if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
		return "", err
	}
	defer os.RemoveAll(tmpdirPath)

	b.contextPath = tmpdirPath
	filename := path.Join(tmpdirPath, "Dockerfile")
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		return "", fmt.Errorf("Can't build a directory with no Dockerfile")
	}
	fileBytes, err := ioutil.ReadFile(filename)
	if err != nil {
		return "", err
	}
	if len(fileBytes) == 0 {
		return "", ErrDockerfileEmpty
	}
	var (
		dockerfile = lineContinuation.ReplaceAllString(stripComments(fileBytes), "")
		stepN      = 0
	)
	for _, line := range strings.Split(dockerfile, "\n") {
		line = strings.Trim(strings.Replace(line, "\t", " ", -1), " \t\r\n")
		if len(line) == 0 {
			continue
		}
		if err := b.BuildStep(fmt.Sprintf("%d", stepN), line); err != nil {
			if b.forceRm {
				b.clearTmp(b.tmpContainers)
			}
			return "", err
		} else if b.rm {
			b.clearTmp(b.tmpContainers)
		}
		stepN += 1
	}
	if b.image != "" {
		fmt.Fprintf(b.outStream, "Successfully built %s\n", utils.TruncateID(b.image))
		return b.image, nil
	}
	return "", fmt.Errorf("No image was generated. This may be because the Dockerfile does not, like, do anything.\n")
}

// Loads a set of images into the repository. This is the complementary of ImageExport.
// The input stream is an uncompressed tar ball containing images and metadata.
func (srv *Server) ImageLoad(in io.Reader) error {
	tmpImageDir, err := ioutil.TempDir("", "docker-import-")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tmpImageDir)

	var (
		repoTarFile = path.Join(tmpImageDir, "repo.tar")
		repoDir     = path.Join(tmpImageDir, "repo")
	)

	tarFile, err := os.Create(repoTarFile)
	if err != nil {
		return err
	}
	if _, err := io.Copy(tarFile, in); err != nil {
		return err
	}
	tarFile.Close()

	repoFile, err := os.Open(repoTarFile)
	if err != nil {
		return err
	}
	if err := os.Mkdir(repoDir, os.ModeDir); err != nil {
		return err
	}
	if err := archive.Untar(repoFile, repoDir); err != nil {
		return err
	}
	repositoriesJson, err := ioutil.ReadFile(path.Join(tmpImageDir, "repo", "repositories"))
	if err != nil {
		return err
	}
	repositories := map[string]Repository{}
	if err := json.Unmarshal(repositoriesJson, &repositories); err != nil {
		return err
	}

	for imageName, tagMap := range repositories {
		for tag, address := range tagMap {
			if err := srv.recursiveLoad(address, tmpImageDir); err != nil {
				return err
			}
			if err := srv.runtime.repositories.Set(imageName, tag, address, true); err != nil {
				return err
			}
		}
	}
	return nil
}

func StoreImage(img *Image, jsonData []byte, layerData archive.Archive, root string) error {
	// Check that root doesn't already exist
	if _, err := os.Stat(root); err == nil {
		return fmt.Errorf("Image %s already exists", img.ID)
	} else if !os.IsNotExist(err) {
		return err
	}
	// Store the layer
	layer := layerPath(root)
	if err := os.MkdirAll(layer, 0755); err != nil {
		return err
	}

	// If layerData is not nil, unpack it into the new layer
	if layerData != nil {
		start := time.Now()
		utils.Debugf("Start untar layer")
		if err := archive.Untar(layerData, layer); err != nil {
			return err
		}
		utils.Debugf("Untar time: %vs", time.Now().Sub(start).Seconds())
	}

	// If raw json is provided, then use it
	if jsonData != nil {
		return ioutil.WriteFile(jsonPath(root), jsonData, 0600)
	}
	// Otherwise, unmarshal the image
	jsonData, err := json.Marshal(img)
	if err != nil {
		return err
	}
	if err := ioutil.WriteFile(jsonPath(root), jsonData, 0600); err != nil {
		return err
	}

	return StoreSize(img, root)
}

func (a *Driver) ApplyDiff(id string, diff archive.ArchiveReader) error {
	return archive.Untar(diff, path.Join(a.rootPath(), "diff", id), nil)
}