distribution/docs/storage/revisionstore.go
Richard 390bb97a88 Manifest and layer soft deletion.
Implement the delete API by implementing soft delete for layers
and blobs by removing link files and updating the blob descriptor
cache.  Deletion is configurable - if it is disabled API calls
will return an unsupported error.

We invalidate the blob descriptor cache by changing the linkedBlobStore's
blobStatter to a blobDescriptorService and naming it blobAccessController.

Delete() is added throughout the relevant API to support this functionality.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
2015-07-24 09:57:20 -07:00

111 lines
2.9 KiB
Go

package storage
import (
"encoding/json"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"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 *repository
blobStore *linkedBlobStore
ctx context.Context
}
// get retrieves the manifest, keyed by revision digest.
func (rs *revisionStore) get(ctx context.Context, revision digest.Digest) (*manifest.SignedManifest, error) {
// Ensure that this revision is available in this repository.
_, err := rs.blobStore.Stat(ctx, revision)
if err != nil {
if err == distribution.ErrBlobUnknown {
return nil, distribution.ErrManifestUnknownRevision{
Name: rs.repository.Name(),
Revision: revision,
}
}
return nil, err
}
// TODO(stevvooe): Need to check descriptor from above to ensure that the
// mediatype is as we expect for the manifest store.
content, err := rs.blobStore.Get(ctx, revision)
if err != nil {
if err == distribution.ErrBlobUnknown {
return nil, distribution.ErrManifestUnknownRevision{
Name: rs.repository.Name(),
Revision: revision,
}
}
return nil, err
}
// Fetch the signatures for the manifest
signatures, err := rs.repository.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(ctx context.Context, sm *manifest.SignedManifest) (distribution.Descriptor, error) {
// Resolve the payload in the manifest.
payload, err := sm.Payload()
if err != nil {
return distribution.Descriptor{}, err
}
// Digest and store the manifest payload in the blob store.
revision, err := rs.blobStore.Put(ctx, manifest.ManifestMediaType, payload)
if err != nil {
context.GetLogger(ctx).Errorf("error putting payload into blobstore: %v", err)
return distribution.Descriptor{}, err
}
// Link the revision into the repository.
if err := rs.blobStore.linkBlob(ctx, revision); err != nil {
return distribution.Descriptor{}, err
}
// Grab each json signature and store them.
signatures, err := sm.Signatures()
if err != nil {
return distribution.Descriptor{}, err
}
if err := rs.repository.Signatures().Put(revision.Digest, signatures...); err != nil {
return distribution.Descriptor{}, err
}
return revision, nil
}
func (rs *revisionStore) delete(ctx context.Context, revision digest.Digest) error {
return rs.blobStore.Delete(ctx, revision)
}