/
push_v2.go
349 lines (289 loc) · 10.3 KB
/
push_v2.go
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package distribution
import (
"errors"
"fmt"
"io"
"sync"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/manifest/schema2"
"github.com/docker/distribution/registry/client"
"github.com/docker/docker/distribution/metadata"
"github.com/docker/docker/distribution/xfer"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/progress"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/reference"
"github.com/docker/docker/registry"
"golang.org/x/net/context"
)
// PushResult contains the tag, manifest digest, and manifest size from the
// push. It's used to signal this information to the trust code in the client
// so it can sign the manifest if necessary.
type PushResult struct {
Tag string
Digest digest.Digest
Size int
}
type v2Pusher struct {
blobSumService *metadata.BlobSumService
ref reference.Named
endpoint registry.APIEndpoint
repoInfo *registry.RepositoryInfo
config *ImagePushConfig
repo distribution.Repository
// pushState is state built by the Download functions.
pushState pushState
}
type pushState struct {
sync.Mutex
// remoteLayers is the set of layers known to exist on the remote side.
// This avoids redundant queries when pushing multiple tags that
// involve the same layers. It is also used to fill in digest and size
// information when building the manifest.
remoteLayers map[layer.DiffID]distribution.Descriptor
// confirmedV2 is set to true if we confirm we're talking to a v2
// registry. This is used to limit fallbacks to the v1 protocol.
confirmedV2 bool
}
func (p *v2Pusher) Push(ctx context.Context) (err error) {
p.pushState.remoteLayers = make(map[layer.DiffID]distribution.Descriptor)
p.repo, p.pushState.confirmedV2, err = NewV2Repository(ctx, p.repoInfo, p.endpoint, p.config.MetaHeaders, p.config.AuthConfig, "push", "pull")
if err != nil {
logrus.Debugf("Error getting v2 registry: %v", err)
return fallbackError{err: err, confirmedV2: p.pushState.confirmedV2}
}
if err = p.pushV2Repository(ctx); err != nil {
if registry.ContinueOnError(err) {
return fallbackError{err: err, confirmedV2: p.pushState.confirmedV2}
}
}
return err
}
func (p *v2Pusher) pushV2Repository(ctx context.Context) (err error) {
if namedTagged, isNamedTagged := p.ref.(reference.NamedTagged); isNamedTagged {
imageID, err := p.config.ReferenceStore.Get(p.ref)
if err != nil {
return fmt.Errorf("tag does not exist: %s", p.ref.String())
}
return p.pushV2Tag(ctx, namedTagged, imageID)
}
if !reference.IsNameOnly(p.ref) {
return errors.New("cannot push a digest reference")
}
// Pull all tags
pushed := 0
for _, association := range p.config.ReferenceStore.ReferencesByName(p.ref) {
if namedTagged, isNamedTagged := association.Ref.(reference.NamedTagged); isNamedTagged {
pushed++
if err := p.pushV2Tag(ctx, namedTagged, association.ImageID); err != nil {
return err
}
}
}
if pushed == 0 {
return fmt.Errorf("no tags to push for %s", p.repoInfo.Name())
}
return nil
}
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{
blobSumService: p.blobSumService,
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)
builder = schema1.NewConfigManifestBuilder(p.repo.Blobs(ctx), p.config.TrustKey, p.repo.Name(), ref.Tag(), 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 manifestFromBuilder(ctx context.Context, builder distribution.ManifestBuilder, descriptors []xfer.UploadDescriptor) (distribution.Manifest, error) {
// descriptors is in reverse order; iterate backwards to get references
// appended in the right order.
for i := len(descriptors) - 1; i >= 0; i-- {
if err := builder.AppendReference(descriptors[i].(*v2PushDescriptor)); err != nil {
return nil, err
}
}
return builder.Build(ctx)
}
type v2PushDescriptor struct {
layer layer.Layer
blobSumService *metadata.BlobSumService
repo distribution.Repository
pushState *pushState
}
func (pd *v2PushDescriptor) Key() string {
return "v2push:" + pd.repo.Name() + " " + pd.layer.DiffID().String()
}
func (pd *v2PushDescriptor) ID() string {
return stringid.TruncateID(pd.layer.DiffID().String())
}
func (pd *v2PushDescriptor) DiffID() layer.DiffID {
return pd.layer.DiffID()
}
func (pd *v2PushDescriptor) Upload(ctx context.Context, progressOutput progress.Output) error {
diffID := pd.DiffID()
pd.pushState.Lock()
if _, ok := pd.pushState.remoteLayers[diffID]; ok {
// it is already known that the push is not needed and
// therefore doing a stat is unnecessary
pd.pushState.Unlock()
progress.Update(progressOutput, pd.ID(), "Layer already exists")
return nil
}
pd.pushState.Unlock()
// Do we have any blobsums associated with this layer's DiffID?
possibleBlobsums, err := pd.blobSumService.GetBlobSums(diffID)
if err == nil {
descriptor, exists, err := blobSumAlreadyExists(ctx, possibleBlobsums, pd.repo, pd.pushState)
if err != nil {
progress.Update(progressOutput, pd.ID(), "Image push failed")
return retryOnError(err)
}
if exists {
progress.Update(progressOutput, pd.ID(), "Layer already exists")
pd.pushState.Lock()
pd.pushState.remoteLayers[diffID] = descriptor
pd.pushState.Unlock()
return nil
}
}
logrus.Debugf("Pushing layer: %s", diffID)
// if digest was empty or not saved, or if blob does not exist on the remote repository,
// then push the blob.
bs := pd.repo.Blobs(ctx)
// Send the layer
layerUpload, err := bs.Create(ctx)
if err != nil {
return retryOnError(err)
}
defer layerUpload.Close()
arch, err := pd.layer.TarStream()
if err != nil {
return xfer.DoNotRetry{Err: err}
}
// don't care if this fails; best effort
size, _ := pd.layer.DiffSize()
reader := progress.NewProgressReader(ioutils.NewCancelReadCloser(ctx, arch), progressOutput, size, pd.ID(), "Pushing")
defer reader.Close()
compressedReader := compress(reader)
digester := digest.Canonical.New()
tee := io.TeeReader(compressedReader, digester.Hash())
nn, err := layerUpload.ReadFrom(tee)
compressedReader.Close()
if err != nil {
return retryOnError(err)
}
pushDigest := digester.Digest()
if _, err := layerUpload.Commit(ctx, distribution.Descriptor{Digest: pushDigest}); err != nil {
return retryOnError(err)
}
logrus.Debugf("uploaded layer %s (%s), %d bytes", diffID, pushDigest, nn)
progress.Update(progressOutput, pd.ID(), "Pushed")
// Cache mapping from this layer's DiffID to the blobsum
if err := pd.blobSumService.Add(diffID, pushDigest); err != nil {
return xfer.DoNotRetry{Err: err}
}
pd.pushState.Lock()
// If Commit succeded, that's an indication that the remote registry
// speaks the v2 protocol.
pd.pushState.confirmedV2 = true
pd.pushState.remoteLayers[diffID] = distribution.Descriptor{
Digest: pushDigest,
MediaType: schema2.MediaTypeLayer,
Size: nn,
}
pd.pushState.Unlock()
return nil
}
func (pd *v2PushDescriptor) Descriptor() distribution.Descriptor {
// Not necessary to lock pushStatus because this is always
// called after all the mutation in pushStatus.
// By the time this function is called, every layer will have
// an entry in remoteLayers.
return pd.pushState.remoteLayers[pd.DiffID()]
}
// blobSumAlreadyExists checks if the registry already know about any of the
// blobsums passed in the "blobsums" slice. If it finds one that the registry
// knows about, it returns the known digest and "true".
func blobSumAlreadyExists(ctx context.Context, blobsums []digest.Digest, repo distribution.Repository, pushState *pushState) (distribution.Descriptor, bool, error) {
for _, dgst := range blobsums {
descriptor, err := repo.Blobs(ctx).Stat(ctx, dgst)
switch err {
case nil:
descriptor.MediaType = schema2.MediaTypeLayer
return descriptor, true, nil
case distribution.ErrBlobUnknown:
// nop
default:
return distribution.Descriptor{}, false, err
}
}
return distribution.Descriptor{}, false, nil
}