Esempio n. 1
0
func (s *TagStore) recursiveLoad(address, tmpImageDir string) error {
	if _, err := s.LookupImage(address); err != nil {
		glog.V(1).Infof("Loading %s", address)

		imageJson, err := ioutil.ReadFile(filepath.Join(tmpImageDir, "repo", address, "json"))
		if err != nil {
			glog.V(1).Infof("Error reading json", err)
			return err
		}

		layer, err := os.Open(filepath.Join(tmpImageDir, "repo", address, "layer.tar"))
		if err != nil {
			glog.V(1).Infof("Error reading embedded tar", err)
			return err
		}
		img, err := image.NewImgJSON(imageJson)
		if err != nil {
			glog.V(1).Infof("Error unmarshalling json", err)
			return err
		}
		if err := image.ValidateID(img.ID); err != nil {
			glog.V(1).Infof("Error validating ID: %s", err)
			return err
		}

		// ensure no two downloads of the same layer happen at the same time
		if c, err := s.poolAdd("pull", "layer:"+img.ID); err != nil {
			if c != nil {
				glog.V(1).Infof("Image (id: %s) load is already running, waiting: %v", img.ID, err)
				<-c
				return nil
			}

			return err
		}

		defer s.poolRemove("pull", "layer:"+img.ID)

		if img.Parent != "" {
			if !s.graph.Exists(img.Parent) {
				if err := s.recursiveLoad(img.Parent, tmpImageDir); err != nil {
					return err
				}
			}
		}
		if err := s.graph.Register(img, layer); err != nil {
			return err
		}
	}
	glog.V(1).Infof("Completed processing %s", address)

	return nil
}
Esempio n. 2
0
func (s *TagStore) pullV2Tag(r *registry.Session, out io.Writer, endpoint *registry.Endpoint, repoInfo *registry.RepositoryInfo, tag string, sf *streamformatter.StreamFormatter, auth *registry.RequestAuthorization) (bool, error) {
	glog.V(1).Infof("Pulling tag from V2 registry: %q", tag)

	remoteDigest, manifestBytes, err := r.GetV2ImageManifest(endpoint, repoInfo.RemoteName, tag, auth)
	if err != nil {
		return false, err
	}

	// loadManifest ensures that the manifest payload has the expected digest
	// if the tag is a digest reference.
	localDigest, manifest, verified, err := s.loadManifest(manifestBytes, tag, remoteDigest)
	if err != nil {
		return false, fmt.Errorf("error verifying manifest: %s", err)
	}

	if verified {
		glog.Infof("Image manifest for %s has been verified", utils.ImageReference(repoInfo.CanonicalName, tag))
	}
	out.Write(sf.FormatStatus(tag, "Pulling from %s", repoInfo.CanonicalName))

	// downloadInfo is used to pass information from download to extractor
	type downloadInfo struct {
		imgJSON    []byte
		img        *image.Image
		digest     digest.Digest
		tmpFile    *os.File
		length     int64
		downloaded bool
		err        chan error
	}

	downloads := make([]downloadInfo, len(manifest.FSLayers))

	for i := len(manifest.FSLayers) - 1; i >= 0; i-- {
		var (
			sumStr  = manifest.FSLayers[i].BlobSum
			imgJSON = []byte(manifest.History[i].V1Compatibility)
		)

		img, err := image.NewImgJSON(imgJSON)
		if err != nil {
			return false, fmt.Errorf("failed to parse json: %s", err)
		}
		downloads[i].img = img

		// Check if exists
		if s.graph.Exists(img.ID) {
			glog.V(1).Infof("Image already exists: %s", img.ID)
			continue
		}

		dgst, err := digest.ParseDigest(sumStr)
		if err != nil {
			return false, err
		}
		downloads[i].digest = dgst

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

		downloadFunc := func(di *downloadInfo) error {
			glog.V(1).Infof("pulling blob %q to V1 img %s", sumStr, img.ID)

			if c, err := s.poolAdd("pull", "img:"+img.ID); err != nil {
				if c != nil {
					out.Write(sf.FormatProgress(stringid.TruncateID(img.ID), "Layer already being pulled by another client. Waiting.", nil))
					<-c
					out.Write(sf.FormatProgress(stringid.TruncateID(img.ID), "Download complete", nil))
				} else {
					glog.V(1).Infof("Image (id: %s) pull is already running, skipping: %v", img.ID, err)
				}
			} else {
				defer s.poolRemove("pull", "img:"+img.ID)
				tmpFile, err := ioutil.TempFile("", "GetV2ImageBlob")
				if err != nil {
					return err
				}

				r, l, err := r.GetV2ImageBlobReader(endpoint, repoInfo.RemoteName, di.digest, auth)
				if err != nil {
					return err
				}
				defer r.Close()

				verifier, err := digest.NewDigestVerifier(di.digest)
				if err != nil {
					return err
				}

				if _, err := io.Copy(tmpFile, progressreader.New(progressreader.Config{
					In:        ioutil.NopCloser(io.TeeReader(r, verifier)),
					Out:       out,
					Formatter: sf,
					Size:      int(l),
					NewLines:  false,
					ID:        stringid.TruncateID(img.ID),
					Action:    "Downloading",
				})); err != nil {
					return fmt.Errorf("unable to copy v2 image blob data: %s", err)
				}

				out.Write(sf.FormatProgress(stringid.TruncateID(img.ID), "Verifying Checksum", nil))

				if !verifier.Verified() {
					return fmt.Errorf("image layer digest verification failed for %q", di.digest)
				}

				out.Write(sf.FormatProgress(stringid.TruncateID(img.ID), "Download complete", nil))

				glog.V(1).Infof("Downloaded %s to tempfile %s", img.ID, tmpFile.Name())
				di.tmpFile = tmpFile
				di.length = l
				di.downloaded = true
			}
			di.imgJSON = imgJSON

			return nil
		}

		downloads[i].err = make(chan error)
		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
				}

				// 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.
		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
}
Esempio n. 3
0
func (s *TagStore) pullImage(r *registry.Session, out io.Writer, imgID, endpoint string, token []string, sf *streamformatter.StreamFormatter) (bool, error) {
	history, err := r.GetRemoteHistory(imgID, endpoint)
	if err != nil {
		return false, err
	}
	out.Write(sf.FormatProgress(stringid.TruncateID(imgID), "Pulling dependent layers", nil))
	// FIXME: Try to stream the images?
	// FIXME: Launch the getRemoteImage() in goroutines

	layersDownloaded := false
	for i := len(history) - 1; i >= 0; i-- {
		id := history[i]

		// ensure no two downloads of the same layer happen at the same time
		if c, err := s.poolAdd("pull", "layer:"+id); err != nil {
			glog.V(1).Infof("Image (id: %s) pull is already running, skipping: %v", id, err)
			<-c
		}
		defer s.poolRemove("pull", "layer:"+id)

		if !s.graph.Exists(id) {
			out.Write(sf.FormatProgress(stringid.TruncateID(id), "Pulling metadata", nil))
			var (
				imgJSON []byte
				imgSize int
				err     error
				img     *image.Image
			)
			retries := 5
			for j := 1; j <= retries; j++ {
				imgJSON, imgSize, err = r.GetRemoteImageJSON(id, endpoint)
				if err != nil && j == retries {
					out.Write(sf.FormatProgress(stringid.TruncateID(id), "Error pulling dependent layers", nil))
					return layersDownloaded, err
				} else if err != nil {
					time.Sleep(time.Duration(j) * 500 * time.Millisecond)
					continue
				}
				img, err = image.NewImgJSON(imgJSON)
				layersDownloaded = true
				if err != nil && j == retries {
					out.Write(sf.FormatProgress(stringid.TruncateID(id), "Error pulling dependent layers", nil))
					return layersDownloaded, fmt.Errorf("Failed to parse json: %s", err)
				} else if err != nil {
					time.Sleep(time.Duration(j) * 500 * time.Millisecond)
					continue
				} else {
					break
				}
			}

			for j := 1; j <= retries; j++ {
				// Get the layer
				status := "Pulling fs layer"
				if j > 1 {
					status = fmt.Sprintf("Pulling fs layer [retries: %d]", j)
				}
				out.Write(sf.FormatProgress(stringid.TruncateID(id), status, nil))
				layer, err := r.GetRemoteImageLayer(img.ID, endpoint, int64(imgSize))
				if uerr, ok := err.(*url.Error); ok {
					err = uerr.Err
				}
				if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries {
					time.Sleep(time.Duration(j) * 500 * time.Millisecond)
					continue
				} else if err != nil {
					out.Write(sf.FormatProgress(stringid.TruncateID(id), "Error pulling dependent layers", nil))
					return layersDownloaded, err
				}
				layersDownloaded = true
				defer layer.Close()

				err = s.graph.Register(img,
					progressreader.New(progressreader.Config{
						In:        layer,
						Out:       out,
						Formatter: sf,
						Size:      imgSize,
						NewLines:  false,
						ID:        stringid.TruncateID(id),
						Action:    "Downloading",
					}))
				if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries {
					time.Sleep(time.Duration(j) * 500 * time.Millisecond)
					continue
				} else if err != nil {
					out.Write(sf.FormatProgress(stringid.TruncateID(id), "Error downloading dependent layers", nil))
					return layersDownloaded, err
				} else {
					break
				}
			}
		}
		out.Write(sf.FormatProgress(stringid.TruncateID(id), "Download complete", nil))
	}
	return layersDownloaded, nil
}