func (p *v2Pusher) pushLayerIfNecessary(out io.Writer, l layer.Layer) (digest.Digest, error) {
logrus.Debugf("Pushing layer: %s", l.DiffID())
// Do we have any blobsums associated with this layer's DiffID?
possibleBlobsums, err := p.blobSumService.GetBlobSums(l.DiffID())
if err == nil {
dgst, exists, err := p.blobSumAlreadyExists(possibleBlobsums)
if err != nil {
out.Write(p.sf.FormatProgress(stringid.TruncateID(string(l.DiffID())), "Image push failed", nil))
return "", err
}
if exists {
out.Write(p.sf.FormatProgress(stringid.TruncateID(string(l.DiffID())), "Layer already exists", nil))
return dgst, nil
}
}
// if digest was empty or not saved, or if blob does not exist on the remote repository,
// then push the blob.
pushDigest, err := p.pushV2Layer(p.repo.Blobs(context.Background()), l)
if err != nil {
return "", err
}
// Cache mapping from this layer's DiffID to the blobsum
if err := p.blobSumService.Add(l.DiffID(), pushDigest); err != nil {
return "", err
}
return pushDigest, nil
}
func (p *v1Pusher) imageListForTag(imgID image.ID, dependenciesSeen map[layer.ChainID]*v1DependencyImage, referencedLayers *[]layer.Layer) (imageListForThisTag []v1Image, err error) {
img, err := p.config.ImageStore.Get(imgID)
if err != nil {
return nil, err
}
topLayerID := img.RootFS.ChainID()
var l layer.Layer
if topLayerID == "" {
l = layer.EmptyLayer
} else {
l, err = p.config.LayerStore.Get(topLayerID)
*referencedLayers = append(*referencedLayers, l)
if err != nil {
return nil, fmt.Errorf("failed to get top layer from image: %v", err)
}
}
dependencyImages, parent, err := generateDependencyImages(l.Parent(), dependenciesSeen)
if err != nil {
return nil, err
}
topImage, err := newV1TopImage(imgID, img, l, parent)
if err != nil {
return nil, err
}
imageListForThisTag = append(dependencyImages, topImage)
return
}
func newV1DependencyImage(l layer.Layer, parent *v1DependencyImage) (*v1DependencyImage, error) {
v1ID := digest.Digest(l.ChainID()).Hex()
config := ""
if parent != nil {
config = fmt.Sprintf(`{"id":"%s","parent":"%s"}`, v1ID, parent.V1ID())
} else {
config = fmt.Sprintf(`{"id":"%s"}`, v1ID)
}
return &v1DependencyImage{
v1ImageCommon: v1ImageCommon{
v1ID: v1ID,
config: []byte(config),
layer: l,
},
}, nil
}
func (p *v2Pusher) pushV2Layer(bs distribution.BlobService, l layer.Layer) (digest.Digest, error) {
out := p.config.OutStream
displayID := stringid.TruncateID(string(l.DiffID()))
out.Write(p.sf.FormatProgress(displayID, "Preparing", nil))
arch, err := l.TarStream()
if err != nil {
return "", err
}
// Send the layer
layerUpload, err := bs.Create(context.Background())
if err != nil {
return "", err
}
defer layerUpload.Close()
// don't care if this fails; best effort
size, _ := l.DiffSize()
reader := progressreader.New(progressreader.Config{
In: ioutil.NopCloser(arch), // we'll take care of close here.
Out: out,
Formatter: p.sf,
Size: size,
NewLines: false,
ID: displayID,
Action: "Pushing",
})
compressedReader := compress(reader)
digester := digest.Canonical.New()
tee := io.TeeReader(compressedReader, digester.Hash())
out.Write(p.sf.FormatProgress(displayID, "Pushing", nil))
nn, err := layerUpload.ReadFrom(tee)
compressedReader.Close()
if err != nil {
return "", err
}
dgst := digester.Digest()
if _, err := layerUpload.Commit(context.Background(), distribution.Descriptor{Digest: dgst}); err != nil {
return "", err
}
logrus.Debugf("uploaded layer %s (%s), %d bytes", l.DiffID(), dgst, nn)
out.Write(p.sf.FormatProgress(displayID, "Pushed", nil))
return dgst, nil
}
func generateDependencyImages(l layer.Layer, dependenciesSeen map[layer.ChainID]*v1DependencyImage) (imageListForThisTag []v1Image, parent *v1DependencyImage, err error) {
if l == nil {
return nil, nil, nil
}
imageListForThisTag, parent, err = generateDependencyImages(l.Parent(), dependenciesSeen)
if dependenciesSeen != nil {
if dependencyImage, present := dependenciesSeen[l.ChainID()]; present {
// This layer is already on the list, we can ignore it
// and all its parents.
return imageListForThisTag, dependencyImage, nil
}
}
dependencyImage, err := newV1DependencyImage(l, parent)
if err != nil {
return nil, nil, err
}
imageListForThisTag = append(imageListForThisTag, dependencyImage)
if dependenciesSeen != nil {
dependenciesSeen[l.ChainID()] = dependencyImage
}
return imageListForThisTag, dependencyImage, nil
}
// getMaxMountAndExistenceCheckAttempts returns a maximum number of cross repository mount attempts from
// source repositories of target registry, maximum number of layer existence checks performed on the target
// repository and whether the check shall be done also with digests mapped to different repositories. The
// decision is based on layer size. The smaller the layer, the fewer attempts shall be made because the cost
// of upload does not outweigh a latency.
func getMaxMountAndExistenceCheckAttempts(layer layer.Layer) (maxMountAttempts, maxExistenceCheckAttempts int, checkOtherRepositories bool) {
size, err := layer.DiffSize()
switch {
// big blob
case size > middleLayerMaximumSize:
// 1st attempt to mount the blob few times
// 2nd few existence checks with digests associated to any repository
// then fallback to upload
return 4, 3, true
// middle sized blobs; if we could not get the size, assume we deal with middle sized blob
case size > smallLayerMaximumSize, err != nil:
// 1st attempt to mount blobs of average size few times
// 2nd try at most 1 existence check if there's an existing mapping to the target repository
// then fallback to upload
return 3, 1, false
// small blobs, do a minimum number of checks
default:
return 1, 1, false
}
}
func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, imageID image.ID) error {
logrus.Debugf("Pushing repository: %s", ref.String())
img, err := p.config.ImageStore.Get(imageID)
if err != nil {
return fmt.Errorf("could not find image from tag %s: %v", ref.String(), err)
}
var l layer.Layer
topLayerID := img.RootFS.ChainID()
if topLayerID == "" {
l = layer.EmptyLayer
} else {
l, err = p.config.LayerStore.Get(topLayerID)
if err != nil {
return fmt.Errorf("failed to get top layer from image: %v", err)
}
defer layer.ReleaseAndLog(p.config.LayerStore, l)
}
var descriptors []xfer.UploadDescriptor
descriptorTemplate := v2PushDescriptor{
v2MetadataService: p.v2MetadataService,
repoInfo: p.repoInfo,
repo: p.repo,
pushState: &p.pushState,
}
// Loop bounds condition is to avoid pushing the base layer on Windows.
for i := 0; i < len(img.RootFS.DiffIDs); i++ {
descriptor := descriptorTemplate
descriptor.layer = l
descriptors = append(descriptors, &descriptor)
l = l.Parent()
}
if err := p.config.UploadManager.Upload(ctx, descriptors, p.config.ProgressOutput); err != nil {
return err
}
// Try schema2 first
builder := schema2.NewManifestBuilder(p.repo.Blobs(ctx), img.RawJSON())
manifest, err := manifestFromBuilder(ctx, builder, descriptors)
if err != nil {
return err
}
manSvc, err := p.repo.Manifests(ctx)
if err != nil {
return err
}
putOptions := []distribution.ManifestServiceOption{client.WithTag(ref.Tag())}
if _, err = manSvc.Put(ctx, manifest, putOptions...); err != nil {
logrus.Warnf("failed to upload schema2 manifest: %v - falling back to schema1", err)
manifestRef, err := distreference.WithTag(p.repo.Named(), ref.Tag())
if err != nil {
return err
}
builder = schema1.NewConfigManifestBuilder(p.repo.Blobs(ctx), p.config.TrustKey, manifestRef, img.RawJSON())
manifest, err = manifestFromBuilder(ctx, builder, descriptors)
if err != nil {
return err
}
if _, err = manSvc.Put(ctx, manifest, putOptions...); err != nil {
return err
}
}
var canonicalManifest []byte
switch v := manifest.(type) {
case *schema1.SignedManifest:
canonicalManifest = v.Canonical
case *schema2.DeserializedManifest:
_, canonicalManifest, err = v.Payload()
if err != nil {
return err
}
}
manifestDigest := digest.FromBytes(canonicalManifest)
progress.Messagef(p.config.ProgressOutput, "", "%s: digest: %s size: %d", ref.Tag(), manifestDigest, len(canonicalManifest))
// Signal digest to the trust client so it can sign the
// push, if appropriate.
progress.Aux(p.config.ProgressOutput, PushResult{Tag: ref.Tag(), Digest: manifestDigest, Size: len(canonicalManifest)})
return nil
}
func (p *v2Pusher) pushV2Tag(ctx context.Context, association reference.Association) error {
ref := association.Ref
logrus.Debugf("Pushing repository: %s", ref.String())
img, err := p.config.ImageStore.Get(association.ImageID)
if err != nil {
return fmt.Errorf("could not find image from tag %s: %v", ref.String(), err)
}
var l layer.Layer
topLayerID := img.RootFS.ChainID()
if topLayerID == "" {
l = layer.EmptyLayer
} else {
l, err = p.config.LayerStore.Get(topLayerID)
if err != nil {
return fmt.Errorf("failed to get top layer from image: %v", err)
}
defer layer.ReleaseAndLog(p.config.LayerStore, l)
}
var descriptors []xfer.UploadDescriptor
descriptorTemplate := v2PushDescriptor{
blobSumService: p.blobSumService,
repo: p.repo,
layersPushed: &p.layersPushed,
confirmedV2: &p.confirmedV2,
}
// Push empty layer if necessary
for _, h := range img.History {
if h.EmptyLayer {
descriptor := descriptorTemplate
descriptor.layer = layer.EmptyLayer
descriptors = []xfer.UploadDescriptor{&descriptor}
break
}
}
// Loop bounds condition is to avoid pushing the base layer on Windows.
for i := 0; i < len(img.RootFS.DiffIDs); i++ {
descriptor := descriptorTemplate
descriptor.layer = l
descriptors = append(descriptors, &descriptor)
l = l.Parent()
}
fsLayers, err := p.config.UploadManager.Upload(ctx, descriptors, p.config.ProgressOutput)
if err != nil {
return err
}
var tag string
if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
tag = tagged.Tag()
}
m, err := CreateV2Manifest(p.repo.Name(), tag, img, fsLayers)
if err != nil {
return err
}
logrus.Infof("Signed manifest for %s using daemon's key: %s", ref.String(), p.config.TrustKey.KeyID())
signed, err := schema1.Sign(m, p.config.TrustKey)
if err != nil {
return err
}
manifestDigest, manifestSize, err := digestFromManifest(signed, ref)
if err != nil {
return err
}
if manifestDigest != "" {
if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
// NOTE: do not change this format without first changing the trust client
// code. This information is used to determine what was pushed and should be signed.
progress.Messagef(p.config.ProgressOutput, "", "%s: digest: %s size: %d", tagged.Tag(), manifestDigest, manifestSize)
}
}
manSvc, err := p.repo.Manifests(ctx)
if err != nil {
return err
}
return manSvc.Put(signed)
}
func (p *v2Pusher) pushV2Tag(association tag.Association) error {
ref := association.Ref
logrus.Debugf("Pushing repository: %s", ref.String())
img, err := p.config.ImageStore.Get(association.ImageID)
if err != nil {
return fmt.Errorf("could not find image from tag %s: %v", ref.String(), err)
}
out := p.config.OutStream
var l layer.Layer
topLayerID := img.RootFS.ChainID()
if topLayerID == "" {
l = layer.EmptyLayer
} else {
l, err = p.config.LayerStore.Get(topLayerID)
if err != nil {
return fmt.Errorf("failed to get top layer from image: %v", err)
}
defer layer.ReleaseAndLog(p.config.LayerStore, l)
}
fsLayers := make(map[layer.DiffID]schema1.FSLayer)
// Push empty layer if necessary
for _, h := range img.History {
if h.EmptyLayer {
dgst, err := p.pushLayerIfNecessary(out, layer.EmptyLayer)
if err != nil {
return err
}
p.layersPushed[dgst] = true
fsLayers[layer.EmptyLayer.DiffID()] = schema1.FSLayer{BlobSum: dgst}
break
}
}
for i := 0; i < len(img.RootFS.DiffIDs); i++ {
dgst, err := p.pushLayerIfNecessary(out, l)
if err != nil {
return err
}
p.layersPushed[dgst] = true
fsLayers[l.DiffID()] = schema1.FSLayer{BlobSum: dgst}
l = l.Parent()
}
var tag string
if tagged, isTagged := ref.(reference.Tagged); isTagged {
tag = tagged.Tag()
}
m, err := CreateV2Manifest(p.repo.Name(), tag, img, fsLayers)
if err != nil {
return err
}
logrus.Infof("Signed manifest for %s using daemon's key: %s", ref.String(), p.config.TrustKey.KeyID())
signed, err := schema1.Sign(m, p.config.TrustKey)
if err != nil {
return err
}
manifestDigest, manifestSize, err := digestFromManifest(signed, p.repo.Name())
if err != nil {
return err
}
if manifestDigest != "" {
if tagged, isTagged := ref.(reference.Tagged); isTagged {
// NOTE: do not change this format without first changing the trust client
// code. This information is used to determine what was pushed and should be signed.
out.Write(p.sf.FormatStatus("", "%s: digest: %s size: %d", tagged.Tag(), manifestDigest, manifestSize))
}
}
manSvc, err := p.repo.Manifests(context.Background())
if err != nil {
return err
}
return manSvc.Put(signed)
}