func (p *v2Puller) pullV2Repository(tag string) (err error) {
var tags []string
taggedName := p.repoInfo.LocalName
if len(tag) > 0 {
tags = []string{tag}
taggedName = utils.ImageReference(p.repoInfo.LocalName, tag)
} else {
var err error
manSvc, err := p.repo.Manifests(context.Background())
if err != nil {
return err
}
tags, err = manSvc.Tags()
if err != nil {
return err
}
}
poolKey := "v2:" + taggedName
broadcaster, found := p.poolAdd("pull", poolKey)
broadcaster.Add(p.config.OutStream)
if found {
// Another pull of the same repository is already taking place; just wait for it to finish
return broadcaster.Wait()
}
// This must use a closure so it captures the value of err when the
// function returns, not when the 'defer' is evaluated.
defer func() {
p.poolRemoveWithError("pull", poolKey, err)
}()
var layersDownloaded bool
for _, tag := range tags {
// pulledNew is true if either new layers were downloaded OR if existing images were newly tagged
// TODO(tiborvass): should we change the name of `layersDownload`? What about message in WriteStatus?
pulledNew, err := p.pullV2Tag(broadcaster, tag, taggedName)
if err != nil {
return err
}
layersDownloaded = layersDownloaded || pulledNew
}
writeStatus(taggedName, broadcaster, p.sf, layersDownloaded)
return nil
}
func (p *v2Puller) pullV2Tag(out io.Writer, tag, taggedName string) (tagUpdated bool, err error) {
logrus.Debugf("Pulling tag from V2 registry: %q", tag)
manSvc, err := p.repo.Manifests(context.Background())
if err != nil {
return false, err
}
unverifiedManifest, err := manSvc.GetByTag(tag)
if err != nil {
return false, err
}
if unverifiedManifest == nil {
return false, fmt.Errorf("image manifest does not exist for tag %q", tag)
}
var verifiedManifest *manifest.Manifest
verifiedManifest, err = verifyManifest(unverifiedManifest, tag)
if err != nil {
return false, err
}
// remove duplicate layers and check parent chain validity
err = fixManifestLayers(verifiedManifest)
if err != nil {
return false, err
}
imgs, err := p.getImageInfos(verifiedManifest)
if err != nil {
return false, err
}
out.Write(p.sf.FormatStatus(tag, "Pulling from %s", p.repo.Name()))
var downloads []*downloadInfo
var layerIDs []string
defer func() {
p.graph.Release(p.sessionID, layerIDs...)
for _, d := range downloads {
p.poolRemoveWithError("pull", d.poolKey, err)
if d.tmpFile != nil {
d.tmpFile.Close()
if err := os.RemoveAll(d.tmpFile.Name()); err != nil {
logrus.Errorf("Failed to remove temp file: %s", d.tmpFile.Name())
}
}
}
}()
for i := len(verifiedManifest.FSLayers) - 1; i >= 0; i-- {
img := imgs[i]
p.graph.Retain(p.sessionID, img.id)
layerIDs = append(layerIDs, img.id)
p.graph.imageMutex.Lock(img.id)
// Check if exists
if p.graph.Exists(img.id) {
if err := p.validateImageInGraph(img.id, imgs, i); err != nil {
p.graph.imageMutex.Unlock(img.id)
return false, fmt.Errorf("image validation failed: %v", err)
}
logrus.Debugf("Image already exists: %s", img.id)
p.graph.imageMutex.Unlock(img.id)
continue
}
p.graph.imageMutex.Unlock(img.id)
out.Write(p.sf.FormatProgress(stringid.TruncateID(img.id), "Pulling fs layer", nil))
d := &downloadInfo{
img: img,
imgIndex: i,
poolKey: "v2layer:" + img.id,
digest: verifiedManifest.FSLayers[i].BlobSum,
// TODO: seems like this chan buffer solved hanging problem in go1.5,
// this can indicate some deeper problem that somehow we never take
// error from channel in loop below
err: make(chan error, 1),
}
tmpFile, err := ioutil.TempFile("", "GetImageBlob")
if err != nil {
return false, err
}
d.tmpFile = tmpFile
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)
}
}
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)
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
}