Golang ID.Digest方法代码示例

// TagImageWithReference adds the given reference to the image ID provided.
func (daemon *Daemon) TagImageWithReference(imageID image.ID, newTag reference.Named) error {
	if err := daemon.referenceStore.AddTag(newTag, imageID.Digest(), true); err != nil {
		return err
	}

	daemon.LogImageEvent(imageID.String(), newTag.String(), "tag")
	return nil
}

func (s *saveSession) saveImage(id image.ID) (map[layer.DiffID]distribution.Descriptor, error) {
	img, err := s.is.Get(id)
	if err != nil {
		return nil, err
	}

	if len(img.RootFS.DiffIDs) == 0 {
		return nil, fmt.Errorf("empty export - not implemented")
	}

	var parent digest.Digest
	var layers []string
	var foreignSrcs map[layer.DiffID]distribution.Descriptor
	for i := range img.RootFS.DiffIDs {
		v1Img := image.V1Image{
			Created: img.Created,
		}
		if i == len(img.RootFS.DiffIDs)-1 {
			v1Img = img.V1Image
		}
		rootFS := *img.RootFS
		rootFS.DiffIDs = rootFS.DiffIDs[:i+1]
		v1ID, err := v1.CreateID(v1Img, rootFS.ChainID(), parent)
		if err != nil {
			return nil, err
		}

		v1Img.ID = v1ID.Hex()
		if parent != "" {
			v1Img.Parent = parent.Hex()
		}

		src, err := s.saveLayer(rootFS.ChainID(), v1Img, img.Created)
		if err != nil {
			return nil, err
		}
		layers = append(layers, v1Img.ID)
		parent = v1ID
		if src.Digest != "" {
			if foreignSrcs == nil {
				foreignSrcs = make(map[layer.DiffID]distribution.Descriptor)
			}
			foreignSrcs[img.RootFS.DiffIDs[i]] = src
		}
	}

	configFile := filepath.Join(s.outDir, id.Digest().Hex()+".json")
	if err := ioutil.WriteFile(configFile, img.RawJSON(), 0644); err != nil {
		return nil, err
	}
	if err := system.Chtimes(configFile, img.Created, img.Created); err != nil {
		return nil, err
	}

	s.images[id].layers = layers
	return foreignSrcs, nil
}

// checkImageDeleteConflict determines whether there are any conflicts
// preventing deletion of the given image from this daemon. A hard conflict is
// any image which has the given image as a parent or any running container
// using the image. A soft conflict is any tags/digest referencing the given
// image or any stopped container using the image. If ignoreSoftConflicts is
// true, this function will not check for soft conflict conditions.
func (daemon *Daemon) checkImageDeleteConflict(imgID image.ID, mask conflictType) *imageDeleteConflict {
	// Check if the image has any descendant images.
	if mask&conflictDependentChild != 0 && len(daemon.imageStore.Children(imgID)) > 0 {
		return &imageDeleteConflict{
			hard:    true,
			imgID:   imgID,
			message: "image has dependent child images",
		}
	}

	if mask&conflictRunningContainer != 0 {
		// Check if any running container is using the image.
		running := func(c *container.Container) bool {
			return c.IsRunning() && c.ImageID == imgID
		}
		if container := daemon.containers.First(running); container != nil {
			return &imageDeleteConflict{
				imgID:   imgID,
				hard:    true,
				used:    true,
				message: fmt.Sprintf("image is being used by running container %s", stringid.TruncateID(container.ID)),
			}
		}
	}

	// Check if any repository tags/digest reference this image.
	if mask&conflictActiveReference != 0 && len(daemon.referenceStore.References(imgID.Digest())) > 0 {
		return &imageDeleteConflict{
			imgID:   imgID,
			message: "image is referenced in multiple repositories",
		}
	}

	if mask&conflictStoppedContainer != 0 {
		// Check if any stopped containers reference this image.
		stopped := func(c *container.Container) bool {
			return !c.IsRunning() && c.ImageID == imgID
		}
		if container := daemon.containers.First(stopped); container != nil {
			return &imageDeleteConflict{
				imgID:   imgID,
				used:    true,
				message: fmt.Sprintf("image is being used by stopped container %s", stringid.TruncateID(container.ID)),
			}
		}
	}

	return nil
}

// removeAllReferencesToImageID attempts to remove every reference to the given
// imgID from this daemon's store of repository tag/digest references. Returns
// on the first encountered error. Removed references are logged to this
// daemon's event service. An "Untagged" types.ImageDelete is added to the
// given list of records.
func (daemon *Daemon) removeAllReferencesToImageID(imgID image.ID, records *[]types.ImageDelete) error {
	imageRefs := daemon.referenceStore.References(imgID.Digest())

	for _, imageRef := range imageRefs {
		parsedRef, err := daemon.removeImageRef(imageRef)
		if err != nil {
			return err
		}

		untaggedRecord := types.ImageDelete{Untagged: parsedRef.String()}

		daemon.LogImageEvent(imgID.String(), imgID.String(), "untag")
		*records = append(*records, untaggedRecord)
	}

	return nil
}

func newV1TopImage(imageID image.ID, img *image.Image, l layer.Layer, parent *v1DependencyImage) (*v1TopImage, error) {
	v1ID := imageID.Digest().Hex()
	parentV1ID := ""
	if parent != nil {
		parentV1ID = parent.V1ID()
	}

	config, err := v1.MakeV1ConfigFromConfig(img, v1ID, parentV1ID, false)
	if err != nil {
		return nil, err
	}

	return &v1TopImage{
		v1ImageCommon: v1ImageCommon{
			v1ID:   v1ID,
			config: config,
			layer:  l,
		},
		imageID: imageID,
	}, nil
}

// imageIsDangling returns whether the given image is "dangling" which means
// that there are no repository references to the given image and it has no
// child images.
func (daemon *Daemon) imageIsDangling(imgID image.ID) bool {
	return !(len(daemon.referenceStore.References(imgID.Digest())) > 0 || len(daemon.imageStore.Children(imgID)) > 0)
}