distribution/registry/storage/revisionstore.go
Stephen J Day 6712e602b0 Move manifest package to schema1
As we begin our march towards multi-arch, we must prepare for the reality of
multiple manifest schemas. This is the beginning of a set of changes to
facilitate this. We are both moving this package into its target position where
it may live peacefully next to other manfiest versions.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
2015-08-21 16:29:47 -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/schema1"
"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) (*schema1.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 schema1.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 *schema1.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, schema1.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)
}