distribution/docs/storage/manifeststore.go

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package storage
import (
"fmt"
"github.com/docker/distribution"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/manifest"
"github.com/docker/libtrust"
)
type manifestStore struct {
repository *repository
revisionStore *revisionStore
tagStore *tagStore
}
var _ distribution.ManifestService = &manifestStore{}
// func (ms *manifestStore) Repository() Repository {
// return ms.repository
// }
func (ms *manifestStore) Tags() ([]string, error) {
ctxu.GetLogger(ms.repository.ctx).Debug("(*manifestStore).Tags")
return ms.tagStore.tags()
}
func (ms *manifestStore) Exists(tag string) (bool, error) {
ctxu.GetLogger(ms.repository.ctx).Debug("(*manifestStore).Exists")
return ms.tagStore.exists(tag)
}
func (ms *manifestStore) Get(tag string) (*manifest.SignedManifest, error) {
ctxu.GetLogger(ms.repository.ctx).Debug("(*manifestStore).Get")
dgst, err := ms.tagStore.resolve(tag)
if err != nil {
return nil, err
}
return ms.revisionStore.get(dgst)
}
func (ms *manifestStore) Put(tag string, manifest *manifest.SignedManifest) error {
ctxu.GetLogger(ms.repository.ctx).Debug("(*manifestStore).Put")
// TODO(stevvooe): Add check here to see if the revision is already
// present in the repository. If it is, we should merge the signatures, do
// a shallow verify (or a full one, doesn't matter) and return an error
// indicating what happened.
// Verify the manifest.
if err := ms.verifyManifest(tag, manifest); err != nil {
return err
}
// Store the revision of the manifest
revision, err := ms.revisionStore.put(manifest)
if err != nil {
return err
}
// Now, tag the manifest
return ms.tagStore.tag(tag, revision)
}
// Delete removes all revisions of the given tag. We may want to change these
// semantics in the future, but this will maintain consistency. The underlying
// blobs are left alone.
func (ms *manifestStore) Delete(tag string) error {
ctxu.GetLogger(ms.repository.ctx).Debug("(*manifestStore).Delete")
revisions, err := ms.tagStore.revisions(tag)
if err != nil {
return err
}
for _, revision := range revisions {
if err := ms.revisionStore.delete(revision); err != nil {
return err
}
}
return ms.tagStore.delete(tag)
}
// verifyManifest ensures that the manifest content is valid from the
// perspective of the registry. It ensures that the name and tag match and
// that the signature is valid for the enclosed payload. As a policy, the
// registry only tries to store valid content, leaving trust policies of that
// content up to consumers.
func (ms *manifestStore) verifyManifest(tag string, mnfst *manifest.SignedManifest) error {
var errs distribution.ErrManifestVerification
if mnfst.Name != ms.repository.Name() {
// TODO(stevvooe): This needs to be an exported error
errs = append(errs, fmt.Errorf("repository name does not match manifest name"))
}
if mnfst.Tag != tag {
// TODO(stevvooe): This needs to be an exported error.
errs = append(errs, fmt.Errorf("tag does not match manifest tag"))
}
if _, err := manifest.Verify(mnfst); err != nil {
switch err {
case libtrust.ErrMissingSignatureKey, libtrust.ErrInvalidJSONContent, libtrust.ErrMissingSignatureKey:
errs = append(errs, distribution.ErrManifestUnverified{})
default:
if err.Error() == "invalid signature" { // TODO(stevvooe): This should be exported by libtrust
errs = append(errs, distribution.ErrManifestUnverified{})
} else {
errs = append(errs, err)
}
}
}
for _, fsLayer := range mnfst.FSLayers {
exists, err := ms.repository.Layers().Exists(fsLayer.BlobSum)
if err != nil {
errs = append(errs, err)
}
if !exists {
errs = append(errs, distribution.ErrUnknownLayer{FSLayer: fsLayer})
}
}
if len(errs) != 0 {
// TODO(stevvooe): These need to be recoverable by a caller.
return errs
}
return nil
}