func (p *v2Pusher) getImageTags(askedTag string) ([]string, error) {
	logrus.Debugf("Checking %q against %#v", askedTag, p.localRepo)
	if len(askedTag) > 0 {
		if _, ok := p.localRepo[askedTag]; !ok || utils.DigestReference(askedTag) {
			return nil, fmt.Errorf("Tag does not exist for %s", askedTag)
		}
		return []string{askedTag}, nil
	}
	var tags []string
	for tag := range p.localRepo {
		if !utils.DigestReference(tag) {
			tags = append(tags, tag)
		}
	}
	return tags, nil
}

func (s *TagStore) getImageTags(localRepo map[string]string, askedTag string) ([]string, error) {
	log.Debugf("Checking %s against %#v", askedTag, localRepo)
	if len(askedTag) > 0 {
		if _, ok := localRepo[askedTag]; !ok || utils.DigestReference(askedTag) {
			return nil, fmt.Errorf("Tag does not exist: %s", askedTag)
		}
		return []string{askedTag}, nil
	}
	var tags []string
	for tag := range localRepo {
		if !utils.DigestReference(tag) {
			tags = append(tags, tag)
		}
	}
	return tags, nil
}

func (p *v1Puller) Pull(tag string) (fallback bool, err error) {
	if utils.DigestReference(tag) {
		// Allowing fallback, because HTTPS v1 is before HTTP v2
		return true, registry.ErrNoSupport{errors.New("Cannot pull by digest with v1 registry")}
	}

	tlsConfig, err := p.registryService.TLSConfig(p.repoInfo.Index.Name)
	if err != nil {
		return false, err
	}
	// Adds Docker-specific headers as well as user-specified headers (metaHeaders)
	tr := transport.NewTransport(
		// TODO(tiborvass): was ReceiveTimeout
		registry.NewTransport(tlsConfig),
		registry.DockerHeaders(p.config.MetaHeaders)...,
	)
	client := registry.HTTPClient(tr)
	v1Endpoint, err := p.endpoint.ToV1Endpoint(p.config.MetaHeaders)
	if err != nil {
		logrus.Debugf("Could not get v1 endpoint: %v", err)
		return true, err
	}
	p.session, err = registry.NewSession(client, p.config.AuthConfig, v1Endpoint)
	if err != nil {
		// TODO(dmcgowan): Check if should fallback
		logrus.Debugf("Fallback from error: %s", err)
		return true, err
	}
	if err := p.pullRepository(tag); err != nil {
		// TODO(dmcgowan): Check if should fallback
		return false, err
	}
	return false, nil
}

// Retrieve the all the images to be uploaded in the correct order
func (p *v1Pusher) getImageList(requestedTag string) ([]string, map[string][]string, error) {
	var (
		imageList   []string
		imagesSeen  = make(map[string]bool)
		tagsByImage = make(map[string][]string)
	)

	for tag, id := range p.localRepo {
		if requestedTag != "" && requestedTag != tag {
			// Include only the requested tag.
			continue
		}

		if utils.DigestReference(tag) {
			// Ignore digest references.
			continue
		}

		var imageListForThisTag []string

		tagsByImage[id] = append(tagsByImage[id], tag)

		for img, err := p.graph.Get(id); img != nil; img, err = p.graph.GetParent(img) {
			if err != nil {
				return nil, nil, err
			}

			if imagesSeen[img.ID] {
				// This image is already on the list, we can ignore it and all its parents
				break
			}

			imagesSeen[img.ID] = true
			imageListForThisTag = append(imageListForThisTag, img.ID)
		}

		// reverse the image list for this tag (so the "most"-parent image is first)
		for i, j := 0, len(imageListForThisTag)-1; i < j; i, j = i+1, j-1 {
			imageListForThisTag[i], imageListForThisTag[j] = imageListForThisTag[j], imageListForThisTag[i]
		}

		// append to main image list
		imageList = append(imageList, imageListForThisTag...)
	}
	if len(imageList) == 0 {
		return nil, nil, fmt.Errorf("No images found for the requested repository / tag")
	}
	logrus.Debugf("Image list: %v", imageList)
	logrus.Debugf("Tags by image: %v", tagsByImage)

	return imageList, tagsByImage, nil
}

// Lookup looks up an image by name in a TagStore and returns it as an
// ImageInspect structure.
func (s *TagStore) Lookup(name string) (*types.ImageInspect, error) {
	image, err := s.LookupImage(name)
	if err != nil || image == nil {
		return nil, fmt.Errorf("No such image: %s", name)
	}

	var repoTags = make([]string, 0)
	var repoDigests = make([]string, 0)

	s.Lock()
	for repoName, repository := range s.Repositories {
		for ref, id := range repository {
			if id == image.ID {
				imgRef := utils.ImageReference(repoName, ref)
				if utils.DigestReference(ref) {
					repoDigests = append(repoDigests, imgRef)
				} else {
					repoTags = append(repoTags, imgRef)
				}
			}
		}
	}
	s.Unlock()

	imageInspect := &types.ImageInspect{
		ID:              image.ID,
		RepoTags:        repoTags,
		RepoDigests:     repoDigests,
		Parent:          image.Parent,
		Comment:         image.Comment,
		Created:         image.Created.Format(time.RFC3339Nano),
		Container:       image.Container,
		ContainerConfig: &image.ContainerConfig,
		DockerVersion:   image.DockerVersion,
		Author:          image.Author,
		Config:          image.Config,
		Architecture:    image.Architecture,
		Os:              image.OS,
		Size:            image.Size,
		VirtualSize:     s.graph.GetParentsSize(image) + image.Size,
	}

	imageInspect.GraphDriver.Name = s.graph.driver.String()

	graphDriverData, err := s.graph.driver.GetMetadata(image.ID)
	if err != nil {
		return nil, err
	}
	imageInspect.GraphDriver.Data = graphDriverData
	return imageInspect, nil
}

//.........这里部分代码省略.........

		downloads = append(downloads, d)

		broadcaster, found := p.poolAdd("pull", d.poolKey)
		broadcaster.Add(out)
		d.broadcaster = broadcaster
		if found {
			d.err <- nil
		} else {
			go p.download(d)
		}
	}

	var tagUpdated bool
	for _, d := range downloads {
		if err := <-d.err; err != nil {
			return false, err
		}

		if d.layer == nil {
			// Wait for a different pull to download and extract
			// this layer.
			err = d.broadcaster.Wait()
			if err != nil {
				return false, err
			}
			continue
		}

		d.tmpFile.Seek(0, 0)
		reader := progressreader.New(progressreader.Config{
			In:        d.tmpFile,
			Out:       d.broadcaster,
			Formatter: p.sf,
			Size:      d.size,
			NewLines:  false,
			ID:        stringid.TruncateID(d.img.ID),
			Action:    "Extracting",
		})

		err = p.graph.Register(d.img, reader)
		if err != nil {
			return false, err
		}

		if err := p.graph.SetDigest(d.img.ID, d.digest); err != nil {
			return false, err
		}

		d.broadcaster.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.ID), "Pull complete", nil))
		d.broadcaster.Close()
		tagUpdated = true
	}

	manifestDigest, _, err := digestFromManifest(manifest, p.repoInfo.LocalName)
	if err != nil {
		return false, err
	}

	// Check for new tag if no layers downloaded
	if !tagUpdated {
		repo, err := p.Get(p.repoInfo.LocalName)
		if err != nil {
			return false, err
		}
		if repo != nil {
			if _, exists := repo[tag]; !exists {
				tagUpdated = true
			}
		} else {
			tagUpdated = true
		}
	}

	if verified && tagUpdated {
		out.Write(p.sf.FormatStatus(p.repo.Name()+":"+tag, "The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security."))
	}

	firstID := layerIDs[len(layerIDs)-1]
	if utils.DigestReference(tag) {
		// TODO(stevvooe): Ideally, we should always set the digest so we can
		// use the digest whether we pull by it or not. Unfortunately, the tag
		// store treats the digest as a separate tag, meaning there may be an
		// untagged digest image that would seem to be dangling by a user.
		if err = p.SetDigest(p.repoInfo.LocalName, tag, firstID); err != nil {
			return false, err
		}
	} else {
		// only set the repository/tag -> image ID mapping when pulling by tag (i.e. not by digest)
		if err = p.Tag(p.repoInfo.LocalName, tag, firstID, true); err != nil {
			return false, err
		}
	}

	if manifestDigest != "" {
		out.Write(p.sf.FormatStatus("", "Digest: %s", manifestDigest))
	}

	return tagUpdated, nil
}

//.........这里部分代码省略.........
		go func(di *downloadInfo) {
			di.err <- downloadFunc(di)
		}(&downloads[i])
	}

	var tagUpdated bool
	for i := len(downloads) - 1; i >= 0; i-- {
		d := &downloads[i]
		if d.err != nil {
			if err := <-d.err; err != nil {
				return false, err
			}
		}
		if d.downloaded {
			// if tmpFile is empty assume download and extracted elsewhere
			defer os.Remove(d.tmpFile.Name())
			defer d.tmpFile.Close()
			d.tmpFile.Seek(0, 0)
			if d.tmpFile != nil {
				err = s.graph.Register(d.img,
					progressreader.New(progressreader.Config{
						In:        d.tmpFile,
						Out:       out,
						Formatter: sf,
						Size:      int(d.length),
						ID:        stringid.TruncateID(d.img.ID),
						Action:    "Extracting",
					}))
				if err != nil {
					return false, err
				}

				if err := s.graph.SetDigest(d.img.ID, d.digest); err != nil {
					return false, err
				}

				// FIXME: Pool release here for parallel tag pull (ensures any downloads block until fully extracted)
			}
			out.Write(sf.FormatProgress(stringid.TruncateID(d.img.ID), "Pull complete", nil))
			tagUpdated = true
		} else {
			out.Write(sf.FormatProgress(stringid.TruncateID(d.img.ID), "Already exists", nil))
		}

	}

	// Check for new tag if no layers downloaded
	if !tagUpdated {
		repo, err := s.Get(repoInfo.LocalName)
		if err != nil {
			return false, err
		}
		if repo != nil {
			if _, exists := repo[tag]; !exists {
				tagUpdated = true
			}
		} else {
			tagUpdated = true
		}
	}

	if verified && tagUpdated {
		out.Write(sf.FormatStatus(utils.ImageReference(repoInfo.CanonicalName, tag), "The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security."))
	}

	if localDigest != remoteDigest { // this is not a verification check.
		// NOTE(stevvooe): This is a very defensive branch and should never
		// happen, since all manifest digest implementations use the same
		// algorithm.
		logrus.WithFields(
			logrus.Fields{
				"local":  localDigest,
				"remote": remoteDigest,
			}).Debugf("local digest does not match remote")

		out.Write(sf.FormatStatus("", "Remote Digest: %s", remoteDigest))
	}

	out.Write(sf.FormatStatus("", "Digest: %s", localDigest))

	if tag == localDigest.String() {
		// TODO(stevvooe): Ideally, we should always set the digest so we can
		// use the digest whether we pull by it or not. Unfortunately, the tag
		// store treats the digest as a separate tag, meaning there may be an
		// untagged digest image that would seem to be dangling by a user.

		if err = s.SetDigest(repoInfo.LocalName, localDigest.String(), downloads[0].img.ID); err != nil {
			return false, err
		}
	}

	if !utils.DigestReference(tag) {
		// only set the repository/tag -> image ID mapping when pulling by tag (i.e. not by digest)
		if err = s.Tag(repoInfo.LocalName, tag, downloads[0].img.ID, true); err != nil {
			return false, err
		}
	}

	return tagUpdated, nil
}

func (s *TagStore) Pull(image string, tag string, imagePullConfig *ImagePullConfig) error {
	var (
		sf = streamformatter.NewJSONStreamFormatter()
	)

	// Resolve the Repository name from fqn to RepositoryInfo
	repoInfo, err := s.registryService.ResolveRepository(image)
	if err != nil {
		return err
	}

	if err := validateRepoName(repoInfo.LocalName); err != nil {
		return err
	}

	c, err := s.poolAdd("pull", utils.ImageReference(repoInfo.LocalName, tag))
	if err != nil {
		if c != nil {
			// Another pull of the same repository is already taking place; just wait for it to finish
			imagePullConfig.OutStream.Write(sf.FormatStatus("", "Repository %s already being pulled by another client. Waiting.", repoInfo.LocalName))
			<-c
			return nil
		}
		return err
	}
	defer s.poolRemove("pull", utils.ImageReference(repoInfo.LocalName, tag))

	logName := repoInfo.LocalName
	if tag != "" {
		logName = utils.ImageReference(logName, tag)
	}

	// Attempt pulling official content from a provided v2 mirror
	if repoInfo.Index.Official {
		v2mirrorEndpoint, v2mirrorRepoInfo, err := configureV2Mirror(repoInfo, s.registryService)
		if err != nil {
			logrus.Errorf("Error configuring mirrors: %s", err)
			return err
		}

		if v2mirrorEndpoint != nil {
			logrus.Debugf("Attempting to pull from v2 mirror: %s", v2mirrorEndpoint.URL)
			return s.pullFromV2Mirror(v2mirrorEndpoint, v2mirrorRepoInfo, imagePullConfig, tag, sf, logName)
		}
	}

	logrus.Debugf("pulling image from host %q with remote name %q", repoInfo.Index.Name, repoInfo.RemoteName)

	endpoint, err := repoInfo.GetEndpoint(imagePullConfig.MetaHeaders)
	if err != nil {
		return err
	}
	// TODO(tiborvass): reuse client from endpoint?
	// Adds Docker-specific headers as well as user-specified headers (metaHeaders)
	tr := transport.NewTransport(
		registry.NewTransport(registry.ReceiveTimeout, endpoint.IsSecure),
		registry.DockerHeaders(imagePullConfig.MetaHeaders)...,
	)
	client := registry.HTTPClient(tr)
	r, err := registry.NewSession(client, imagePullConfig.AuthConfig, endpoint)
	if err != nil {
		return err
	}

	if len(repoInfo.Index.Mirrors) == 0 && (repoInfo.Index.Official || endpoint.Version == registry.APIVersion2) {
		if repoInfo.Official {
			s.trustService.UpdateBase()
		}

		logrus.Debugf("pulling v2 repository with local name %q", repoInfo.LocalName)
		if err := s.pullV2Repository(r, imagePullConfig.OutStream, repoInfo, tag, sf); err == nil {
			s.eventsService.Log("pull", logName, "")
			return nil
		} else if err != registry.ErrDoesNotExist && err != ErrV2RegistryUnavailable {
			logrus.Errorf("Error from V2 registry: %s", err)
		}

		logrus.Debug("image does not exist on v2 registry, falling back to v1")
	}

	if utils.DigestReference(tag) {
		return fmt.Errorf("pulling with digest reference failed from v2 registry")
	}

	logrus.Debugf("pulling v1 repository with local name %q", repoInfo.LocalName)
	if err = s.pullRepository(r, imagePullConfig.OutStream, repoInfo, tag, sf); err != nil {
		return err
	}

	s.eventsService.Log("pull", logName, "")

	return nil

}

//.........这里部分代码省略.........
			}
		}
		if d.layer != nil {
			// if tmpFile is empty assume download and extracted elsewhere
			defer os.Remove(d.tmpFile.Name())
			defer d.tmpFile.Close()
			d.tmpFile.Seek(0, 0)
			if d.tmpFile != nil {
				err := func() error {
					reader := progressreader.New(progressreader.Config{
						In:        d.tmpFile,
						Out:       out,
						Formatter: p.sf,
						Size:      int(d.size),
						NewLines:  false,
						ID:        stringid.TruncateID(d.img.id),
						Action:    "Extracting",
					})

					p.graph.imageMutex.Lock(d.img.id)
					defer p.graph.imageMutex.Unlock(d.img.id)

					// Must recheck the data on disk if any exists.
					// This protects against races where something
					// else is written to the graph under this ID
					// after attemptIDReuse.
					if p.graph.Exists(d.img.id) {
						if err := p.validateImageInGraph(d.img.id, imgs, i); err != nil {
							return fmt.Errorf("image validation failed: %v", err)
						}
					}

					if err := p.graph.register(d.img, reader); err != nil {
						return err
					}

					if err := p.graph.setLayerDigest(d.img.id, d.digest); err != nil {
						return err
					}

					if err := p.graph.setV1CompatibilityConfig(d.img.id, d.img.v1Compatibility); err != nil {
						return err
					}

					return nil
				}()
				if err != nil {
					return false, err
				}

				// FIXME: Pool release here for parallel tag pull (ensures any downloads block until fully extracted)
			}
			out.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.id), "Pull complete", nil))
			tagUpdated = true
		} else {
			out.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.id), "Already exists", nil))
		}
	}

	manifestDigest, _, err := digestFromManifest(unverifiedManifest, p.repoInfo.LocalName)
	if err != nil {
		return false, err
	}

	// Check for new tag if no layers downloaded
	if !tagUpdated {
		repo, err := p.Get(p.repoInfo.LocalName)
		if err != nil {
			return false, err
		}
		if repo != nil {
			if _, exists := repo[tag]; !exists {
				tagUpdated = true
			}
		} else {
			tagUpdated = true
		}
	}

	if utils.DigestReference(tag) {
		// TODO(stevvooe): Ideally, we should always set the digest so we can
		// use the digest whether we pull by it or not. Unfortunately, the tag
		// store treats the digest as a separate tag, meaning there may be an
		// untagged digest image that would seem to be dangling by a user.
		if err = p.SetDigest(p.repoInfo.LocalName, tag, downloads[0].img.id); err != nil {
			return false, err
		}
	} else {
		// only set the repository/tag -> image ID mapping when pulling by tag (i.e. not by digest)
		if err = p.Tag(p.repoInfo.LocalName, tag, downloads[0].img.id, true); err != nil {
			return false, err
		}
	}

	if manifestDigest != "" {
		out.Write(p.sf.FormatStatus("", "Digest: %s", manifestDigest))
	}

	return tagUpdated, nil
}

//.........这里部分代码省略.........
		// Check if exists
		if p.graph.Exists(img.ID) {
			logrus.Debugf("Image already exists: %s", img.ID)
			continue
		}

		out.Write(p.sf.FormatProgress(stringid.TruncateID(img.ID), "Pulling fs layer", nil))

		downloads[i].err = make(chan error)
		go p.download(&downloads[i])
	}

	var tagUpdated bool
	for i := len(downloads) - 1; i >= 0; i-- {
		d := &downloads[i]
		if d.err != nil {
			if err := <-d.err; err != nil {
				return false, err
			}
		}
		if d.layer != nil {
			// if tmpFile is empty assume download and extracted elsewhere
			defer os.Remove(d.tmpFile.Name())
			defer d.tmpFile.Close()
			d.tmpFile.Seek(0, 0)
			if d.tmpFile != nil {

				reader := progressreader.New(progressreader.Config{
					In:        d.tmpFile,
					Out:       out,
					Formatter: p.sf,
					Size:      int(d.size),
					NewLines:  false,
					ID:        stringid.TruncateID(d.img.ID),
					Action:    "Extracting",
				})

				err = p.graph.Register(d.img, reader)
				if err != nil {
					return false, err
				}

				if err := p.graph.SetDigest(d.img.ID, d.digest); err != nil {
					return false, err
				}

				// FIXME: Pool release here for parallel tag pull (ensures any downloads block until fully extracted)
			}
			out.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.ID), "Pull complete", nil))
			tagUpdated = true
		} else {
			out.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.ID), "Already exists", nil))
		}
	}

	manifestDigest, _, err := digestFromManifest(manifest, p.repoInfo.LocalName)
	if err != nil {
		return false, err
	}

	// Check for new tag if no layers downloaded
	if !tagUpdated {
		repo, err := p.Get(p.repoInfo.LocalName)
		if err != nil {
			return false, err
		}
		if repo != nil {
			if _, exists := repo[tag]; !exists {
				tagUpdated = true
			}
		} else {
			tagUpdated = true
		}
	}

	if verified && tagUpdated {
		out.Write(p.sf.FormatStatus(p.repo.Name()+":"+tag, "The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security."))
	}

	if utils.DigestReference(tag) {
		// TODO(stevvooe): Ideally, we should always set the digest so we can
		// use the digest whether we pull by it or not. Unfortunately, the tag
		// store treats the digest as a separate tag, meaning there may be an
		// untagged digest image that would seem to be dangling by a user.
		if err = p.SetDigest(p.repoInfo.LocalName, tag, downloads[0].img.ID); err != nil {
			return false, err
		}
	} else {
		// only set the repository/tag -> image ID mapping when pulling by tag (i.e. not by digest)
		if err = p.Tag(p.repoInfo.LocalName, tag, downloads[0].img.ID, true); err != nil {
			return false, err
		}
	}

	if manifestDigest != "" {
		out.Write(p.sf.FormatStatus("", "Digest: %s", manifestDigest))
	}

	return tagUpdated, nil
}

// loadManifest loads a manifest from a byte array and verifies its content.
// The signature must be verified or an error is returned. If the manifest
// contains no signatures by a trusted key for the name in the manifest, the
// image is not considered verified. The parsed manifest object and a boolean
// for whether the manifest is verified is returned.
func (s *TagStore) loadManifest(eng *engine.Engine, manifestBytes []byte, dgst, ref string) (*registry.ManifestData, bool, error) {
	sig, err := libtrust.ParsePrettySignature(manifestBytes, "signatures")
	if err != nil {
		return nil, false, fmt.Errorf("error parsing payload: %s", err)
	}

	keys, err := sig.Verify()
	if err != nil {
		return nil, false, fmt.Errorf("error verifying payload: %s", err)
	}

	payload, err := sig.Payload()
	if err != nil {
		return nil, false, fmt.Errorf("error retrieving payload: %s", err)
	}

	var manifestDigest digest.Digest

	if dgst != "" {
		manifestDigest, err = digest.ParseDigest(dgst)
		if err != nil {
			return nil, false, fmt.Errorf("invalid manifest digest from registry: %s", err)
		}

		dgstVerifier, err := digest.NewDigestVerifier(manifestDigest)
		if err != nil {
			return nil, false, fmt.Errorf("unable to verify manifest digest from registry: %s", err)
		}

		dgstVerifier.Write(payload)

		if !dgstVerifier.Verified() {
			computedDigest, _ := digest.FromBytes(payload)
			return nil, false, fmt.Errorf("unable to verify manifest digest: registry has %q, computed %q", manifestDigest, computedDigest)
		}
	}

	if utils.DigestReference(ref) && ref != manifestDigest.String() {
		return nil, false, fmt.Errorf("mismatching image manifest digest: got %q, expected %q", manifestDigest, ref)
	}

	var manifest registry.ManifestData
	if err := json.Unmarshal(payload, &manifest); err != nil {
		return nil, false, fmt.Errorf("error unmarshalling manifest: %s", err)
	}
	if manifest.SchemaVersion != 1 {
		return nil, false, fmt.Errorf("unsupported schema version: %d", manifest.SchemaVersion)
	}

	var verified bool
	for _, key := range keys {
		job := eng.Job("trust_key_check")
		b, err := key.MarshalJSON()
		if err != nil {
			return nil, false, fmt.Errorf("error marshalling public key: %s", err)
		}
		namespace := manifest.Name
		if namespace[0] != '/' {
			namespace = "/" + namespace
		}
		stdoutBuffer := bytes.NewBuffer(nil)

		job.Args = append(job.Args, namespace)
		job.Setenv("PublicKey", string(b))
		// Check key has read/write permission (0x03)
		job.SetenvInt("Permission", 0x03)
		job.Stdout.Add(stdoutBuffer)
		if err = job.Run(); err != nil {
			return nil, false, fmt.Errorf("error running key check: %s", err)
		}
		result := engine.Tail(stdoutBuffer, 1)
		logrus.Debugf("Key check result: %q", result)
		if result == "verified" {
			verified = true
		}
	}

	return &manifest, verified, nil
}

// Images returns a filtered list of images. filterArgs is a JSON-encoded set
// of filter arguments which will be interpreted by pkg/parsers/filters.
// filter is a shell glob string applied to repository names. The argument
// named all controls whether all images in the graph are filtered, or just
// the heads.
func (s *TagStore) Images(filterArgs, filter string, all bool) ([]*types.Image, error) {
	var (
		allImages  map[string]*image.Image
		err        error
		filtTagged = true
		filtLabel  = false
	)

	imageFilters, err := filters.FromParam(filterArgs)
	if err != nil {
		return nil, err
	}
	for name := range imageFilters {
		if _, ok := acceptedImageFilterTags[name]; !ok {
			return nil, fmt.Errorf("Invalid filter '%s'", name)
		}
	}

	if i, ok := imageFilters["dangling"]; ok {
		for _, value := range i {
			if strings.ToLower(value) == "true" {
				filtTagged = false
			}
		}
	}

	_, filtLabel = imageFilters["label"]

	if all && filtTagged {
		allImages = s.graph.Map()
	} else {
		allImages = s.graph.Heads()
	}

	lookup := make(map[string]*types.Image)
	s.Lock()
	for repoName, repository := range s.Repositories {
		if filter != "" {
			if match, _ := path.Match(filter, repoName); !match {
				continue
			}
		}
		for ref, id := range repository {
			imgRef := utils.ImageReference(repoName, ref)
			image, err := s.graph.Get(id)
			if err != nil {
				logrus.Warnf("couldn't load %s from %s: %s", id, imgRef, err)
				continue
			}

			if lImage, exists := lookup[id]; exists {
				if filtTagged {
					if utils.DigestReference(ref) {
						lImage.RepoDigests = append(lImage.RepoDigests, imgRef)
					} else { // Tag Ref.
						lImage.RepoTags = append(lImage.RepoTags, imgRef)
					}
				}
			} else {
				// get the boolean list for if only the untagged images are requested
				delete(allImages, id)
				if !imageFilters.MatchKVList("label", image.ContainerConfig.Labels) {
					continue
				}
				if filtTagged {
					newImage := new(types.Image)
					newImage.ParentID = image.Parent
					newImage.ID = image.ID
					newImage.Created = image.Created.Unix()
					newImage.Size = image.Size
					newImage.VirtualSize = s.graph.GetParentsSize(image) + image.Size
					newImage.Labels = image.ContainerConfig.Labels

					if utils.DigestReference(ref) {
						newImage.RepoTags = []string{}
						newImage.RepoDigests = []string{imgRef}
					} else {
						newImage.RepoTags = []string{imgRef}
						newImage.RepoDigests = []string{}
					}

					lookup[id] = newImage
				}
			}

		}
	}
	s.Unlock()

	images := []*types.Image{}
	for _, value := range lookup {
		images = append(images, value)
	}

	// Display images which aren't part of a repository/tag
//.........这里部分代码省略.........

func (s *TagStore) CmdImages(job *engine.Job) engine.Status {
	var (
		allImages   map[string]*image.Image
		err         error
		filt_tagged = true
		filt_label  = false
	)

	imageFilters, err := filters.FromParam(job.Getenv("filters"))
	if err != nil {
		return job.Error(err)
	}
	for name := range imageFilters {
		if _, ok := acceptedImageFilterTags[name]; !ok {
			return job.Errorf("Invalid filter '%s'", name)
		}
	}

	if i, ok := imageFilters["dangling"]; ok {
		for _, value := range i {
			if strings.ToLower(value) == "true" {
				filt_tagged = false
			}
		}
	}

	_, filt_label = imageFilters["label"]

	if job.GetenvBool("all") && filt_tagged {
		allImages, err = s.graph.Map()
	} else {
		allImages, err = s.graph.Heads()
	}
	if err != nil {
		return job.Error(err)
	}
	lookup := make(map[string]*engine.Env)
	s.Lock()
	for repoName, repository := range s.Repositories {
		if job.Getenv("filter") != "" {
			if match, _ := path.Match(job.Getenv("filter"), repoName); !match {
				continue
			}
		}
		for ref, id := range repository {
			imgRef := utils.ImageReference(repoName, ref)
			image, err := s.graph.Get(id)
			if err != nil {
				log.Printf("Warning: couldn't load %s from %s: %s", id, imgRef, err)
				continue
			}

			if out, exists := lookup[id]; exists {
				if filt_tagged {
					if utils.DigestReference(ref) {
						out.SetList("RepoDigests", append(out.GetList("RepoDigests"), imgRef))
					} else { // Tag Ref.
						out.SetList("RepoTags", append(out.GetList("RepoTags"), imgRef))
					}
				}
			} else {
				// get the boolean list for if only the untagged images are requested
				delete(allImages, id)
				if !imageFilters.MatchKVList("label", image.ContainerConfig.Labels) {
					continue
				}
				if filt_tagged {
					out := &engine.Env{}
					out.SetJson("ParentId", image.Parent)
					out.SetJson("Id", image.ID)
					out.SetInt64("Created", image.Created.Unix())
					out.SetInt64("Size", image.Size)
					out.SetInt64("VirtualSize", image.GetParentsSize(0)+image.Size)
					out.SetJson("Labels", image.ContainerConfig.Labels)

					if utils.DigestReference(ref) {
						out.SetList("RepoTags", []string{})
						out.SetList("RepoDigests", []string{imgRef})
					} else {
						out.SetList("RepoTags", []string{imgRef})
						out.SetList("RepoDigests", []string{})
					}

					lookup[id] = out
				}
			}

		}
	}
	s.Unlock()

	outs := engine.NewTable("Created", len(lookup))
	for _, value := range lookup {
		outs.Add(value)
	}

	// Display images which aren't part of a repository/tag
	if job.Getenv("filter") == "" || filt_label {
		for _, image := range allImages {
			if !imageFilters.MatchKVList("label", image.ContainerConfig.Labels) {
//.........这里部分代码省略.........

// Images returns a filtered list of images. filterArgs is a JSON-encoded set
// of filter arguments which will be interpreted by pkg/parsers/filters.
// filter is a shell glob string applied to repository names. The argument
// named all controls whether all images in the graph are filtered, or just
// the heads.
func (s *TagStore) Images(filterArgs, filter string, all bool) ([]*types.Image, error) {
	var (
		allImages  map[string]*image.Image
		err        error
		filtTagged = true
		filtLabel  = false
	)

	imageFilters, err := filters.FromParam(filterArgs)
	if err != nil {
		return nil, err
	}
	for name := range imageFilters {
		if _, ok := acceptedImageFilterTags[name]; !ok {
			return nil, fmt.Errorf("Invalid filter '%s'", name)
		}
	}

	if i, ok := imageFilters["dangling"]; ok {
		for _, value := range i {
			if v := strings.ToLower(value); v == "true" {
				filtTagged = false
			} else if v != "false" {
				return nil, fmt.Errorf("Invalid filter 'dangling=%s'", v)
			}
		}
	}

	_, filtLabel = imageFilters["label"]

	if all && filtTagged {
		allImages = s.graph.Map()
	} else {
		allImages = s.graph.heads()
	}

	lookup := make(map[string]*types.Image)
	s.Lock()
	for repoName, repository := range s.Repositories {
		filterTagName := ""
		if filter != "" {
			filterName := filter
			// Test if the tag was in there, if yes, get the name
			if strings.Contains(filterName, ":") {
				filterWithTag := strings.Split(filter, ":")
				filterName = filterWithTag[0]
				filterTagName = filterWithTag[1]
			}
			if match, _ := path.Match(filterName, repoName); !match {
				continue
			}
			if filterTagName != "" {
				if _, ok := repository[filterTagName]; !ok {
					continue
				}
			}
		}
		for ref, id := range repository {
			imgRef := utils.ImageReference(repoName, ref)
			if !strings.Contains(imgRef, filterTagName) {
				continue
			}
			image, err := s.graph.Get(id)
			if err != nil {
				logrus.Warnf("couldn't load %s from %s: %s", id, imgRef, err)
				continue
			}

			if lImage, exists := lookup[id]; exists {
				if filtTagged {
					if utils.DigestReference(ref) {
						lImage.RepoDigests = append(lImage.RepoDigests, imgRef)
					} else { // Tag Ref.
						lImage.RepoTags = append(lImage.RepoTags, imgRef)
					}
				}
			} else {
				// get the boolean list for if only the untagged images are requested
				delete(allImages, id)

				if len(imageFilters["label"]) > 0 {
					if image.Config == nil {
						// Very old image that do not have image.Config (or even labels)
						continue
					}
					// We are now sure image.Config is not nil
					if !imageFilters.MatchKVList("label", image.Config.Labels) {
						continue
					}
				}
				if filtTagged {
					newImage := newImage(image, s.graph.getParentsSize(image))

					if utils.DigestReference(ref) {
						newImage.RepoTags = []string{}
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		if *flViz {
			fmt.Fprintf(cli.out, "digraph docker {\n")
			printNode = (*DockerCli).printVizNode
		} else {
			printNode = (*DockerCli).printTreeNode
		}

		if startImage != nil {
			root := engine.NewTable("Created", 1)
			root.Add(startImage)
			cli.WalkTree(*noTrunc, root, byParent, "", printNode)
		} else if matchName == "" {
			cli.WalkTree(*noTrunc, roots, byParent, "", printNode)
		}
		if *flViz {
			fmt.Fprintf(cli.out, " base [style=invisible]\n}\n")
		}
	} else {
		v := url.Values{}
		if len(imageFilterArgs) > 0 {
			filterJSON, err := filters.ToParam(imageFilterArgs)
			if err != nil {
				return err
			}
			v.Set("filters", filterJSON)
		}

		if cmd.NArg() == 1 {
			// FIXME rename this parameter, to not be confused with the filters flag
			v.Set("filter", matchName)
		}
		if *all {
			v.Set("all", "1")
		}

		body, _, err := readBody(cli.call("GET", "/images/json?"+v.Encode(), nil, nil))

		if err != nil {
			return err
		}

		outs := engine.NewTable("Created", 0)
		if _, err := outs.ReadListFrom(body); err != nil {
			return err
		}

		w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
		if !*quiet {
			if *showDigests {
				fmt.Fprintln(w, "REPOSITORY\tTAG\tDIGEST\tIMAGE ID\tCREATED\tVIRTUAL SIZE")
			} else {
				fmt.Fprintln(w, "REPOSITORY\tTAG\tIMAGE ID\tCREATED\tVIRTUAL SIZE")
			}
		}

		for _, out := range outs.Data {
			outID := out.Get("Id")
			if !*noTrunc {
				outID = stringid.TruncateID(outID)
			}

			repoTags := out.GetList("RepoTags")
			repoDigests := out.GetList("RepoDigests")

			if len(repoTags) == 1 && repoTags[0] == "<none>:<none>" && len(repoDigests) == 1 && repoDigests[0] == "<none>@<none>" {
				// dangling image - clear out either repoTags or repoDigsts so we only show it once below
				repoDigests = []string{}
			}

			// combine the tags and digests lists
			tagsAndDigests := append(repoTags, repoDigests...)
			for _, repoAndRef := range tagsAndDigests {
				repo, ref := parsers.ParseRepositoryTag(repoAndRef)
				// default tag and digest to none - if there's a value, it'll be set below
				tag := "<none>"
				digest := "<none>"
				if utils.DigestReference(ref) {
					digest = ref
				} else {
					tag = ref
				}

				if !*quiet {
					if *showDigests {
						fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s ago\t%s\n", repo, tag, digest, outID, units.HumanDuration(time.Now().UTC().Sub(time.Unix(out.GetInt64("Created"), 0))), units.HumanSize(float64(out.GetInt64("VirtualSize"))))
					} else {
						fmt.Fprintf(w, "%s\t%s\t%s\t%s ago\t%s\n", repo, tag, outID, units.HumanDuration(time.Now().UTC().Sub(time.Unix(out.GetInt64("Created"), 0))), units.HumanSize(float64(out.GetInt64("VirtualSize"))))
					}
				} else {
					fmt.Fprintln(w, outID)
				}
			}
		}

		if !*quiet {
			w.Flush()
		}
	}
	return nil
}

//.........这里部分代码省略.........
			err = d.broadcaster.Wait()
			if err != nil {
				return false, err
			}
			continue
		}

		d.tmpFile.Seek(0, 0)
		err := func() error {
			reader := progressreader.New(progressreader.Config{
				In:        d.tmpFile,
				Out:       d.broadcaster,
				Formatter: p.sf,
				Size:      d.size,
				NewLines:  false,
				ID:        stringid.TruncateID(d.img.id),
				Action:    "Extracting",
			})

			p.graph.imagesMutex.Lock()
			defer p.graph.imagesMutex.Unlock()

			p.graph.imageMutex.Lock(d.img.id)
			defer p.graph.imageMutex.Unlock(d.img.id)

			// Must recheck the data on disk if any exists.
			// This protects against races where something
			// else is written to the graph under this ID
			// after attemptIDReuse.
			if p.graph.Exists(d.img.id) {
				if err := p.validateImageInGraph(d.img.id, imgs, d.imgIndex); err != nil {
					return fmt.Errorf("image validation failed: %v", err)
				}
			}

			if err := p.graph.register(d.img, reader); err != nil {
				return err
			}

			if err := p.graph.setLayerDigest(d.img.id, d.digest); err != nil {
				return err
			}

			if err := p.graph.setV1CompatibilityConfig(d.img.id, d.img.v1Compatibility); err != nil {
				return err
			}

			return nil
		}()
		if err != nil {
			return false, err
		}

		d.broadcaster.Write(p.sf.FormatProgress(stringid.TruncateID(d.img.id), "Pull complete", nil))
		d.broadcaster.Close()
		tagUpdated = true
	}

	manifestDigest, _, err := digestFromManifest(unverifiedManifest, p.repoInfo.LocalName)
	if err != nil {
		return false, err
	}

	// Check for new tag if no layers downloaded
	if !tagUpdated {
		repo, err := p.Get(p.repoInfo.LocalName)
		if err != nil {
			return false, err
		}
		if repo != nil {
			if _, exists := repo[tag]; !exists {
				tagUpdated = true
			}
		} else {
			tagUpdated = true
		}
	}

	firstID := layerIDs[len(layerIDs)-1]
	if utils.DigestReference(tag) {
		// TODO(stevvooe): Ideally, we should always set the digest so we can
		// use the digest whether we pull by it or not. Unfortunately, the tag
		// store treats the digest as a separate tag, meaning there may be an
		// untagged digest image that would seem to be dangling by a user.
		if err = p.SetDigest(p.repoInfo.LocalName, tag, firstID); err != nil {
			return false, err
		}
	} else {
		// only set the repository/tag -> image ID mapping when pulling by tag (i.e. not by digest)
		if err = p.Tag(p.repoInfo.LocalName, tag, firstID, true); err != nil {
			return false, err
		}
	}

	if manifestDigest != "" {
		out.Write(p.sf.FormatStatus("", "Digest: %s", manifestDigest))
	}

	return tagUpdated, nil
}

// CmdImages lists the images in a specified repository, or all top-level images if no repository is specified.
//
// Usage: docker images [OPTIONS] [REPOSITORY]
func (cli *DockerCli) CmdImages(args ...string) error {
	cmd := Cli.Subcmd("images", []string{"[REPOSITORY[:TAG]]"}, Cli.DockerCommands["images"].Description, true)
	quiet := cmd.Bool([]string{"q", "-quiet"}, false, "Only show numeric IDs")
	all := cmd.Bool([]string{"a", "-all"}, false, "Show all images (default hides intermediate images)")
	noTrunc := cmd.Bool([]string{"#notrunc", "-no-trunc"}, false, "Don't truncate output")
	showDigests := cmd.Bool([]string{"-digests"}, false, "Show digests")

	flFilter := opts.NewListOpts(nil)
	cmd.Var(&flFilter, []string{"f", "-filter"}, "Filter output based on conditions provided")
	cmd.Require(flag.Max, 1)

	cmd.ParseFlags(args, true)

	// Consolidate all filter flags, and sanity check them early.
	// They'll get process in the daemon/server.
	imageFilterArgs := filters.Args{}
	for _, f := range flFilter.GetAll() {
		var err error
		imageFilterArgs, err = filters.ParseFlag(f, imageFilterArgs)
		if err != nil {
			return err
		}
	}

	matchName := cmd.Arg(0)
	v := url.Values{}
	if len(imageFilterArgs) > 0 {
		filterJSON, err := filters.ToParam(imageFilterArgs)
		if err != nil {
			return err
		}
		v.Set("filters", filterJSON)
	}

	if cmd.NArg() == 1 {
		// FIXME rename this parameter, to not be confused with the filters flag
		v.Set("filter", matchName)
	}
	if *all {
		v.Set("all", "1")
	}

	serverResp, err := cli.call("GET", "/images/json?"+v.Encode(), nil, nil)
	if err != nil {
		return err
	}

	defer serverResp.body.Close()

	images := []types.Image{}
	if err := json.NewDecoder(serverResp.body).Decode(&images); err != nil {
		return err
	}

	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
	if !*quiet {
		if *showDigests {
			fmt.Fprintln(w, "REPOSITORY\tTAG\tDIGEST\tIMAGE ID\tCREATED\tVIRTUAL SIZE")
		} else {
			fmt.Fprintln(w, "REPOSITORY\tTAG\tIMAGE ID\tCREATED\tVIRTUAL SIZE")
		}
	}

	for _, image := range images {
		ID := image.ID
		if !*noTrunc {
			ID = stringid.TruncateID(ID)
		}

		repoTags := image.RepoTags
		repoDigests := image.RepoDigests

		if len(repoTags) == 1 && repoTags[0] == "<none>:<none>" && len(repoDigests) == 1 && repoDigests[0] == "<none>@<none>" {
			// dangling image - clear out either repoTags or repoDigsts so we only show it once below
			repoDigests = []string