Golang Session.GetRemoteTags方法代码示例

func (s *TagStore) pullMRepository(r *registry.Session, out io.Writer, containerID, containerImage, localName, remoteName, askedTag string, sf *utils.StreamFormatter, parallel bool, mirrors []string) error {
	out.Write(sf.FormatStatus("", "Pulling (parallel:%v) repository %s:%s", parallel, localName, askedTag))

	if askedTag == "" {
		return fmt.Errorf("Error: tag is empty")
	}

	repoData, err := r.GetRepositoryData(remoteName)
	if err != nil {
		if strings.Contains(err.Error(), "HTTP code: 404") {
			return fmt.Errorf("Error: image %s not found", remoteName)
		}
		// Unexpected HTTP error
		return err
	}

	log.Debugf("Retrieving the tag list")
	tagsList, err := r.GetRemoteTags(repoData.Endpoints, remoteName, repoData.Tokens)
	if err != nil {
		log.Errorf("%v", err)
		return err
	}

	id, exists := tagsList[askedTag]
	if !exists {
		return fmt.Errorf("Tag %s not found in repository %s", askedTag, localName)
	}
	img, exists := repoData.ImgList[id]
	if !exists {
		return fmt.Errorf("Image ID %s not found in repository %s", id, localName)
	}
	img.Tag = askedTag

	var lastErr error
	success := false
	var is_downloaded bool
	if mirrors != nil {
		for _, ep := range mirrors {
			out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling and merging image (%s) from %s, mirror: %s", img.Tag, localName, ep), nil))
			if is_downloaded, err = s.pullAndMergeImage(r, out, containerID, containerImage, img.ID, ep, repoData.Tokens, sf); err != nil {
				// Don't report errors when pulling from mirrors.
				log.Debugf("Error pulling and merging image (%s) from %s, mirror: %s, %s", img.Tag, localName, ep, err)
				continue
			}
			success = true
			break
		}
	}
	if !success {
		for _, ep := range repoData.Endpoints {
			out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling and merging image (%s) from %s, endpoint: %s", img.Tag, localName, ep), nil))
			if is_downloaded, err = s.pullAndMergeImage(r, out, containerID, containerImage, img.ID, ep, repoData.Tokens, sf); err != nil {
				// It's not ideal that only the last error is returned, it would be better to concatenate the errors.
				// As the error is also given to the output stream the user will see the error.
				lastErr = err
				out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Error pulling and merging image (%s) from %s, endpoint: %s, %s", img.Tag, localName, ep, err), nil))
				continue
			}
			success = true
			break
		}
	}
	if !success {
		err := fmt.Errorf("Error pulling and merging image (%s) from %s, %v", img.Tag, localName, lastErr)
		out.Write(sf.FormatProgress(utils.TruncateID(img.ID), err.Error(), nil))
		return err
	}
	out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Layer is downloaded ? %v", is_downloaded), nil))
	out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Complete", nil))

	if err = s.Set(localName, img.Tag, img.ID, true); err != nil {
		return err
	}

	return nil
}

func (s *TagStore) pullRepository(r *registry.Session, out io.Writer, repoInfo *registry.RepositoryInfo, askedTag string, sf *utils.StreamFormatter, parallel bool) error {
	out.Write(sf.FormatStatus("", "Pulling repository %s", repoInfo.CanonicalName))

	repoData, err := r.GetRepositoryData(repoInfo.RemoteName)
	if err != nil {
		if strings.Contains(err.Error(), "HTTP code: 404") {
			return fmt.Errorf("Error: image %s:%s not found", repoInfo.RemoteName, askedTag)
		}
		// Unexpected HTTP error
		return err
	}

	log.Debugf("Retrieving the tag list")
	tagsList, err := r.GetRemoteTags(repoData.Endpoints, repoInfo.RemoteName, repoData.Tokens)
	if err != nil {
		log.Errorf("unable to get remote tags: %s", err)
		return err
	}

	for tag, id := range tagsList {
		repoData.ImgList[id] = &registry.ImgData{
			ID:       id,
			Tag:      tag,
			Checksum: "",
		}
	}

	log.Debugf("Registering tags")
	// If no tag has been specified, pull them all
	var imageId string
	if askedTag == "" {
		for tag, id := range tagsList {
			repoData.ImgList[id].Tag = tag
		}
	} else {
		// Otherwise, check that the tag exists and use only that one
		id, exists := tagsList[askedTag]
		if !exists {
			return fmt.Errorf("Tag %s not found in repository %s", askedTag, repoInfo.CanonicalName)
		}
		imageId = id
		repoData.ImgList[id].Tag = askedTag
	}

	errors := make(chan error)

	layers_downloaded := false
	for _, image := range repoData.ImgList {
		downloadImage := func(img *registry.ImgData) {
			if askedTag != "" && img.Tag != askedTag {
				if parallel {
					errors <- nil
				}
				return
			}

			if img.Tag == "" {
				log.Debugf("Image (id: %s) present in this repository but untagged, skipping", img.ID)
				if parallel {
					errors <- nil
				}
				return
			}

			// ensure no two downloads of the same image happen at the same time
			if c, err := s.poolAdd("pull", "img:"+img.ID); err != nil {
				if c != nil {
					out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Layer already being pulled by another client. Waiting.", nil))
					<-c
					out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Download complete", nil))
				} else {
					log.Debugf("Image (id: %s) pull is already running, skipping: %v", img.ID, err)
				}
				if parallel {
					errors <- nil
				}
				return
			}
			defer s.poolRemove("pull", "img:"+img.ID)

			out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling image (%s) from %s", img.Tag, repoInfo.CanonicalName), nil))
			success := false
			var lastErr, err error
			var is_downloaded bool
			for _, ep := range repoInfo.Index.Mirrors {
				out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling image (%s) from %s, mirror: %s", img.Tag, repoInfo.CanonicalName, ep), nil))
				if is_downloaded, err = s.pullImage(r, out, img.ID, ep, repoData.Tokens, sf); err != nil {
					// Don't report errors when pulling from mirrors.
					log.Debugf("Error pulling image (%s) from %s, mirror: %s, %s", img.Tag, repoInfo.CanonicalName, ep, err)
					continue
				}
				layers_downloaded = layers_downloaded || is_downloaded
				success = true
				break
			}
			if !success {
				for _, ep := range repoData.Endpoints {
					out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling image (%s) from %s, endpoint: %s", img.Tag, repoInfo.CanonicalName, ep), nil))
					if is_downloaded, err = s.pullImage(r, out, img.ID, ep, repoData.Tokens, sf); err != nil {
						// It's not ideal that only the last error is returned, it would be better to concatenate the errors.
//.........这里部分代码省略.........

// TODO rewrite this whole PoC
func main() {
	flag.Usage = func() {
		flag.PrintDefaults()
	}
	flag.Parse()
	if debug {
		os.Setenv("DEBUG", "1")
		log.SetLevel(log.DebugLevel)
	}
	if flag.NArg() == 0 {
		fmt.Println("ERROR: no image names provided")
		flag.Usage()
		os.Exit(1)
	}

	// make tempDir
	tempDir, err := ioutil.TempDir("", "docker-fetch-")
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
	defer os.RemoveAll(tempDir)

	fetcher := NewFetcher(tempDir)
	sc := registry.NewServiceConfig(rOptions)

	for _, arg := range flag.Args() {
		remote, tagName := parsers.ParseRepositoryTag(arg)
		if tagName == "" {
			tagName = "latest"
		}

		repInfo, err := sc.NewRepositoryInfo(remote)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		log.Debugf("%#v %q\n", repInfo, tagName)

		idx, err := repInfo.GetEndpoint()
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Fprintf(os.Stderr, "Pulling %s:%s from %s\n", repInfo.RemoteName, tagName, idx)

		var session *registry.Session
		if s, ok := fetcher.sessions[idx.String()]; ok {
			session = s
		} else {
			// TODO(vbatts) obviously the auth and http factory shouldn't be nil here
			session, err = registry.NewSession(nil, nil, idx, timeout)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				os.Exit(1)
			}
		}

		rd, err := session.GetRepositoryData(repInfo.RemoteName)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		log.Debugf("rd: %#v", rd)

		// produce the "repositories" file for the archive
		if _, ok := fetcher.repositories[repInfo.RemoteName]; !ok {
			fetcher.repositories[repInfo.RemoteName] = graph.Repository{}
		}
		log.Debugf("repositories: %#v", fetcher.repositories)

		if len(rd.Endpoints) == 0 {
			log.Fatalf("expected registry endpoints, but received none from the index")
		}

		tags, err := session.GetRemoteTags(rd.Endpoints, repInfo.RemoteName, rd.Tokens)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		if hash, ok := tags[tagName]; ok {
			fetcher.repositories[repInfo.RemoteName][tagName] = hash
		}
		log.Debugf("repositories: %#v", fetcher.repositories)

		imgList, err := session.GetRemoteHistory(fetcher.repositories[repInfo.RemoteName][tagName], rd.Endpoints[0], rd.Tokens)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		log.Debugf("imgList: %#v", imgList)

		for _, imgID := range imgList {
			// pull layers and jsons
			buf, _, err := session.GetRemoteImageJSON(imgID, rd.Endpoints[0], rd.Tokens)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				os.Exit(1)
			}
//.........这里部分代码省略.........