Golang RootFS.DiffIDs方法代码示例

func (p *v2Puller) pullSchema2(ctx context.Context, ref reference.Named, mfst *schema2.DeserializedManifest) (imageID image.ID, manifestDigest digest.Digest, err error) {
	manifestDigest, err = schema2ManifestDigest(ref, mfst)
	if err != nil {
		return "", "", err
	}

	target := mfst.Target()
	imageID = image.ID(target.Digest)
	if _, err := p.config.ImageStore.Get(imageID); err == nil {
		// If the image already exists locally, no need to pull
		// anything.
		return imageID, manifestDigest, nil
	}

	configChan := make(chan []byte, 1)
	errChan := make(chan error, 1)
	var cancel func()
	ctx, cancel = context.WithCancel(ctx)

	// Pull the image config
	go func() {
		configJSON, err := p.pullSchema2ImageConfig(ctx, target.Digest)
		if err != nil {
			errChan <- err
			cancel()
			return
		}
		configChan <- configJSON
	}()

	var descriptors []xfer.DownloadDescriptor

	// Note that the order of this loop is in the direction of bottom-most
	// to top-most, so that the downloads slice gets ordered correctly.
	for _, d := range mfst.References() {
		layerDescriptor := &v2LayerDescriptor{
			digest:         d.Digest,
			repo:           p.repo,
			blobSumService: p.blobSumService,
		}

		descriptors = append(descriptors, layerDescriptor)
	}

	var (
		configJSON         []byte       // raw serialized image config
		unmarshalledConfig image.Image  // deserialized image config
		downloadRootFS     image.RootFS // rootFS to use for registering layers.
	)
	if runtime.GOOS == "windows" {
		configJSON, unmarshalledConfig, err = receiveConfig(configChan, errChan)
		if err != nil {
			return "", "", err
		}
		if unmarshalledConfig.RootFS == nil {
			return "", "", errors.New("image config has no rootfs section")
		}
		downloadRootFS = *unmarshalledConfig.RootFS
		downloadRootFS.DiffIDs = []layer.DiffID{}
	} else {
		downloadRootFS = *image.NewRootFS()
	}

	rootFS, release, err := p.config.DownloadManager.Download(ctx, downloadRootFS, descriptors, p.config.ProgressOutput)
	if err != nil {
		if configJSON != nil {
			// Already received the config
			return "", "", err
		}
		select {
		case err = <-errChan:
			return "", "", err
		default:
			cancel()
			select {
			case <-configChan:
			case <-errChan:
			}
			return "", "", err
		}
	}
	defer release()

	if configJSON == nil {
		configJSON, unmarshalledConfig, err = receiveConfig(configChan, errChan)
		if err != nil {
			return "", "", err
		}
	}

	// The DiffIDs returned in rootFS MUST match those in the config.
	// Otherwise the image config could be referencing layers that aren't
	// included in the manifest.
	if len(rootFS.DiffIDs) != len(unmarshalledConfig.RootFS.DiffIDs) {
		return "", "", errRootFSMismatch
	}

	for i := range rootFS.DiffIDs {
		if rootFS.DiffIDs[i] != unmarshalledConfig.RootFS.DiffIDs[i] {
			return "", "", errRootFSMismatch
//.........这里部分代码省略.........

func (l *tarexporter) Load(inTar io.ReadCloser, outStream io.Writer) error {
	tmpDir, err := ioutil.TempDir("", "docker-import-")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tmpDir)

	if err := chrootarchive.Untar(inTar, tmpDir, nil); err != nil {
		return err
	}
	// read manifest, if no file then load in legacy mode
	manifestPath, err := safePath(tmpDir, manifestFileName)
	if err != nil {
		return err
	}
	manifestFile, err := os.Open(manifestPath)
	if err != nil {
		if os.IsNotExist(err) {
			return l.legacyLoad(tmpDir, outStream)
		}
		return manifestFile.Close()
	}
	defer manifestFile.Close()

	var manifest []manifestItem
	if err := json.NewDecoder(manifestFile).Decode(&manifest); err != nil {
		return err
	}

	for _, m := range manifest {
		configPath, err := safePath(tmpDir, m.Config)
		if err != nil {
			return err
		}
		config, err := ioutil.ReadFile(configPath)
		if err != nil {
			return err
		}
		img, err := image.NewFromJSON(config)
		if err != nil {
			return err
		}
		var rootFS image.RootFS
		rootFS = *img.RootFS
		rootFS.DiffIDs = nil

		if expected, actual := len(m.Layers), len(img.RootFS.DiffIDs); expected != actual {
			return fmt.Errorf("invalid manifest, layers length mismatch: expected %q, got %q", expected, actual)
		}

		for i, diffID := range img.RootFS.DiffIDs {
			layerPath, err := safePath(tmpDir, m.Layers[i])
			if err != nil {
				return err
			}
			newLayer, err := l.loadLayer(layerPath, rootFS)
			if err != nil {
				return err
			}
			defer layer.ReleaseAndLog(l.ls, newLayer)
			if expected, actual := diffID, newLayer.DiffID(); expected != actual {
				return fmt.Errorf("invalid diffID for layer %d: expected %q, got %q", i, expected, actual)
			}
			rootFS.Append(diffID)
		}

		imgID, err := l.is.Create(config)
		if err != nil {
			return err
		}

		for _, repoTag := range m.RepoTags {
			named, err := reference.ParseNamed(repoTag)
			if err != nil {
				return err
			}
			ref, ok := named.(reference.NamedTagged)
			if !ok {
				return fmt.Errorf("invalid tag %q", repoTag)
			}
			l.setLoadedTag(ref, imgID, outStream)
		}

	}

	return nil
}

func (l *tarexporter) Load(inTar io.ReadCloser, outStream io.Writer, quiet bool) error {
	var (
		sf             = streamformatter.NewJSONStreamFormatter()
		progressOutput progress.Output
	)
	if !quiet {
		progressOutput = sf.NewProgressOutput(outStream, false)
		outStream = &streamformatter.StdoutFormatter{Writer: outStream, StreamFormatter: streamformatter.NewJSONStreamFormatter()}
	}

	tmpDir, err := ioutil.TempDir("", "docker-import-")
	if err != nil {
		return err
	}
	defer os.RemoveAll(tmpDir)

	if err := chrootarchive.Untar(inTar, tmpDir, nil); err != nil {
		return err
	}
	// read manifest, if no file then load in legacy mode
	manifestPath, err := safePath(tmpDir, manifestFileName)
	if err != nil {
		return err
	}
	manifestFile, err := os.Open(manifestPath)
	if err != nil {
		if os.IsNotExist(err) {
			return l.legacyLoad(tmpDir, outStream, progressOutput)
		}
		return manifestFile.Close()
	}
	defer manifestFile.Close()

	var manifest []manifestItem
	if err := json.NewDecoder(manifestFile).Decode(&manifest); err != nil {
		return err
	}

	var parentLinks []parentLink

	for _, m := range manifest {
		configPath, err := safePath(tmpDir, m.Config)
		if err != nil {
			return err
		}
		config, err := ioutil.ReadFile(configPath)
		if err != nil {
			return err
		}
		img, err := image.NewFromJSON(config)
		if err != nil {
			return err
		}
		var rootFS image.RootFS
		rootFS = *img.RootFS
		rootFS.DiffIDs = nil

		if expected, actual := len(m.Layers), len(img.RootFS.DiffIDs); expected != actual {
			return fmt.Errorf("invalid manifest, layers length mismatch: expected %q, got %q", expected, actual)
		}

		for i, diffID := range img.RootFS.DiffIDs {
			layerPath, err := safePath(tmpDir, m.Layers[i])
			if err != nil {
				return err
			}
			r := rootFS
			r.Append(diffID)
			newLayer, err := l.ls.Get(r.ChainID())
			if err != nil {
				newLayer, err = l.loadLayer(layerPath, rootFS, diffID.String(), progressOutput)
				if err != nil {
					return err
				}
			}
			defer layer.ReleaseAndLog(l.ls, newLayer)
			if expected, actual := diffID, newLayer.DiffID(); expected != actual {
				return fmt.Errorf("invalid diffID for layer %d: expected %q, got %q", i, expected, actual)
			}
			rootFS.Append(diffID)
		}

		imgID, err := l.is.Create(config)
		if err != nil {
			return err
		}

		for _, repoTag := range m.RepoTags {
			named, err := reference.ParseNamed(repoTag)
			if err != nil {
				return err
			}
			ref, ok := named.(reference.NamedTagged)
			if !ok {
				return fmt.Errorf("invalid tag %q", repoTag)
			}
			l.setLoadedTag(ref, imgID, outStream)
		}

		parentLinks = append(parentLinks, parentLink{imgID, m.Parent})
//.........这里部分代码省略.........

// SquashImage creates a new image with the diff of the specified image and the specified parent.
// This new image contains only the layers from it's parent + 1 extra layer which contains the diff of all the layers in between.
// The existing image(s) is not destroyed.
// If no parent is specified, a new image with the diff of all the specified image's layers merged into a new layer that has no parents.
func (daemon *Daemon) SquashImage(id, parent string) (string, error) {
	img, err := daemon.imageStore.Get(image.ID(id))
	if err != nil {
		return "", err
	}

	var parentImg *image.Image
	var parentChainID layer.ChainID
	if len(parent) != 0 {
		parentImg, err = daemon.imageStore.Get(image.ID(parent))
		if err != nil {
			return "", errors.Wrap(err, "error getting specified parent layer")
		}
		parentChainID = parentImg.RootFS.ChainID()
	} else {
		rootFS := image.NewRootFS()
		parentImg = &image.Image{RootFS: rootFS}
	}

	l, err := daemon.layerStore.Get(img.RootFS.ChainID())
	if err != nil {
		return "", errors.Wrap(err, "error getting image layer")
	}
	defer daemon.layerStore.Release(l)

	ts, err := l.TarStreamFrom(parentChainID)
	if err != nil {
		return "", errors.Wrapf(err, "error getting tar stream to parent")
	}
	defer ts.Close()

	newL, err := daemon.layerStore.Register(ts, parentChainID)
	if err != nil {
		return "", errors.Wrap(err, "error registering layer")
	}
	defer daemon.layerStore.Release(newL)

	var newImage image.Image
	newImage = *img
	newImage.RootFS = nil

	var rootFS image.RootFS
	rootFS = *parentImg.RootFS
	rootFS.DiffIDs = append(rootFS.DiffIDs, newL.DiffID())
	newImage.RootFS = &rootFS

	for i, hi := range newImage.History {
		if i >= len(parentImg.History) {
			hi.EmptyLayer = true
		}
		newImage.History[i] = hi
	}

	now := time.Now()
	var historyComment string
	if len(parent) > 0 {
		historyComment = fmt.Sprintf("merge %s to %s", id, parent)
	} else {
		historyComment = fmt.Sprintf("create new from %s", id)
	}

	newImage.History = append(newImage.History, image.History{
		Created: now,
		Comment: historyComment,
	})
	newImage.Created = now

	b, err := json.Marshal(&newImage)
	if err != nil {
		return "", errors.Wrap(err, "error marshalling image config")
	}

	newImgID, err := daemon.imageStore.Create(b)
	if err != nil {
		return "", errors.Wrap(err, "error creating new image after squash")
	}
	return string(newImgID), nil
}