distribution/registry/storage/revisionstore.go

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package storage
import (
"encoding/json"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/libtrust"
)
// revisionStore supports storing and managing manifest revisions.
type revisionStore struct {
*repository
}
// exists returns true if the revision is available in the named repository.
func (rs *revisionStore) exists(revision digest.Digest) (bool, error) {
revpath, err := rs.pm.path(manifestRevisionPathSpec{
name: rs.Name(),
revision: revision,
})
if err != nil {
return false, err
}
exists, err := exists(rs.repository.ctx, rs.driver, revpath)
if err != nil {
return false, err
}
return exists, nil
}
// get retrieves the manifest, keyed by revision digest.
func (rs *revisionStore) get(revision digest.Digest) (*manifest.SignedManifest, error) {
// Ensure that this revision is available in this repository.
if exists, err := rs.exists(revision); err != nil {
return nil, err
} else if !exists {
return nil, distribution.ErrUnknownManifestRevision{
Name: rs.Name(),
Revision: revision,
}
}
content, err := rs.blobStore.get(revision)
if err != nil {
return nil, err
}
// Fetch the signatures for the manifest
signatures, err := rs.Signatures().Get(revision)
if err != nil {
return nil, err
}
jsig, err := libtrust.NewJSONSignature(content, signatures...)
if err != nil {
return nil, err
}
// Extract the pretty JWS
raw, err := jsig.PrettySignature("signatures")
if err != nil {
return nil, err
}
var sm manifest.SignedManifest
if err := json.Unmarshal(raw, &sm); err != nil {
return nil, err
}
return &sm, nil
}
// put stores the manifest in the repository, if not already present. Any
// updated signatures will be stored, as well.
func (rs *revisionStore) put(sm *manifest.SignedManifest) (digest.Digest, error) {
// Resolve the payload in the manifest.
payload, err := sm.Payload()
if err != nil {
return "", err
}
// Digest and store the manifest payload in the blob store.
revision, err := rs.blobStore.put(payload)
if err != nil {
logrus.Errorf("error putting payload into blobstore: %v", err)
return "", err
}
// Link the revision into the repository.
if err := rs.link(revision); err != nil {
return "", err
}
// Grab each json signature and store them.
signatures, err := sm.Signatures()
if err != nil {
return "", err
}
if err := rs.Signatures().Put(revision, signatures...); err != nil {
return "", err
}
return revision, nil
}
// link links the revision into the repository.
func (rs *revisionStore) link(revision digest.Digest) error {
revisionPath, err := rs.pm.path(manifestRevisionLinkPathSpec{
name: rs.Name(),
revision: revision,
})
if err != nil {
return err
}
if exists, err := exists(rs.repository.ctx, rs.driver, revisionPath); err != nil {
return err
} else if exists {
// Revision has already been linked!
return nil
}
return rs.blobStore.link(revisionPath, revision)
}
// delete removes the specified manifest revision from storage.
func (rs *revisionStore) delete(revision digest.Digest) error {
revisionPath, err := rs.pm.path(manifestRevisionPathSpec{
name: rs.Name(),
revision: revision,
})
if err != nil {
return err
}
return rs.driver.Delete(rs.repository.ctx, revisionPath)
}