6712e602b0
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>
111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
package storage
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import (
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"encoding/json"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/manifest/schema1"
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"github.com/docker/libtrust"
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)
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// revisionStore supports storing and managing manifest revisions.
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type revisionStore struct {
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repository *repository
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blobStore *linkedBlobStore
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ctx context.Context
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}
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// get retrieves the manifest, keyed by revision digest.
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func (rs *revisionStore) get(ctx context.Context, revision digest.Digest) (*schema1.SignedManifest, error) {
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// Ensure that this revision is available in this repository.
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_, err := rs.blobStore.Stat(ctx, revision)
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if err != nil {
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if err == distribution.ErrBlobUnknown {
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return nil, distribution.ErrManifestUnknownRevision{
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Name: rs.repository.Name(),
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Revision: revision,
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}
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}
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return nil, err
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}
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// TODO(stevvooe): Need to check descriptor from above to ensure that the
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// mediatype is as we expect for the manifest store.
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content, err := rs.blobStore.Get(ctx, revision)
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if err != nil {
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if err == distribution.ErrBlobUnknown {
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return nil, distribution.ErrManifestUnknownRevision{
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Name: rs.repository.Name(),
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Revision: revision,
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}
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}
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return nil, err
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}
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// Fetch the signatures for the manifest
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signatures, err := rs.repository.Signatures().Get(revision)
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if err != nil {
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return nil, err
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}
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jsig, err := libtrust.NewJSONSignature(content, signatures...)
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if err != nil {
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return nil, err
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}
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// Extract the pretty JWS
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raw, err := jsig.PrettySignature("signatures")
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if err != nil {
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return nil, err
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}
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var sm schema1.SignedManifest
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if err := json.Unmarshal(raw, &sm); err != nil {
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return nil, err
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}
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return &sm, nil
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}
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// put stores the manifest in the repository, if not already present. Any
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// updated signatures will be stored, as well.
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func (rs *revisionStore) put(ctx context.Context, sm *schema1.SignedManifest) (distribution.Descriptor, error) {
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// Resolve the payload in the manifest.
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payload, err := sm.Payload()
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if err != nil {
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return distribution.Descriptor{}, err
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}
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// Digest and store the manifest payload in the blob store.
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revision, err := rs.blobStore.Put(ctx, schema1.ManifestMediaType, payload)
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if err != nil {
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context.GetLogger(ctx).Errorf("error putting payload into blobstore: %v", err)
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return distribution.Descriptor{}, err
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}
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// Link the revision into the repository.
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if err := rs.blobStore.linkBlob(ctx, revision); err != nil {
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return distribution.Descriptor{}, err
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}
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// Grab each json signature and store them.
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signatures, err := sm.Signatures()
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if err != nil {
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return distribution.Descriptor{}, err
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}
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if err := rs.repository.Signatures().Put(revision.Digest, signatures...); err != nil {
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return distribution.Descriptor{}, err
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}
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return revision, nil
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}
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func (rs *revisionStore) delete(ctx context.Context, revision digest.Digest) error {
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return rs.blobStore.Delete(ctx, revision)
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}
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