144 lines
3.5 KiB
Go
144 lines
3.5 KiB
Go
package storage
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import (
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"path"
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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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storagedriver "github.com/docker/distribution/registry/storage/driver"
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)
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// tagStore provides methods to manage manifest tags in a backend storage driver.
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type tagStore struct {
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repository *repository
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blobStore *blobStore
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ctx context.Context
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}
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// tags lists the manifest tags for the specified repository.
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func (ts *tagStore) tags() ([]string, error) {
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p, err := ts.blobStore.pm.path(manifestTagPathSpec{
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name: ts.repository.Name(),
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})
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if err != nil {
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return nil, err
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}
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var tags []string
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entries, err := ts.blobStore.driver.List(ts.ctx, p)
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if err != nil {
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switch err := err.(type) {
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case storagedriver.PathNotFoundError:
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return nil, distribution.ErrRepositoryUnknown{Name: ts.repository.Name()}
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default:
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return nil, err
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}
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}
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for _, entry := range entries {
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_, filename := path.Split(entry)
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tags = append(tags, filename)
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}
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return tags, nil
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}
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// exists returns true if the specified manifest tag exists in the repository.
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func (ts *tagStore) exists(tag string) (bool, error) {
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tagPath, err := ts.blobStore.pm.path(manifestTagCurrentPathSpec{
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name: ts.repository.Name(),
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tag: tag,
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})
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if err != nil {
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return false, err
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}
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exists, err := exists(ts.ctx, ts.blobStore.driver, tagPath)
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if err != nil {
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return false, err
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}
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return exists, nil
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}
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// tag tags the digest with the given tag, updating the the store to point at
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// the current tag. The digest must point to a manifest.
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func (ts *tagStore) tag(tag string, revision digest.Digest) error {
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currentPath, err := ts.blobStore.pm.path(manifestTagCurrentPathSpec{
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name: ts.repository.Name(),
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tag: tag,
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})
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if err != nil {
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return err
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}
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nbs := ts.linkedBlobStore(ts.ctx, tag)
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// Link into the index
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if err := nbs.linkBlob(ts.ctx, distribution.Descriptor{Digest: revision}); err != nil {
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return err
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}
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// Overwrite the current link
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return ts.blobStore.link(ts.ctx, currentPath, revision)
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}
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// resolve the current revision for name and tag.
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func (ts *tagStore) resolve(tag string) (digest.Digest, error) {
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currentPath, err := ts.blobStore.pm.path(manifestTagCurrentPathSpec{
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name: ts.repository.Name(),
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tag: tag,
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})
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if err != nil {
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return "", err
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}
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revision, err := ts.blobStore.readlink(ts.ctx, currentPath)
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if err != nil {
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switch err.(type) {
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case storagedriver.PathNotFoundError:
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return "", distribution.ErrManifestUnknown{Name: ts.repository.Name(), Tag: tag}
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}
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return "", err
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}
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return revision, nil
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}
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// delete removes the tag from repository, including the history of all
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// revisions that have the specified tag.
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func (ts *tagStore) delete(tag string) error {
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tagPath, err := ts.blobStore.pm.path(manifestTagPathSpec{
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name: ts.repository.Name(),
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tag: tag,
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})
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if err != nil {
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return err
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}
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return ts.blobStore.driver.Delete(ts.ctx, tagPath)
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}
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// namedBlobStore returns the namedBlobStore for the named tag, allowing one
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// to index manifest blobs by tag name. While the tag store doesn't map
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// precisely to the linked blob store, using this ensures the links are
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// managed via the same code path.
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func (ts *tagStore) linkedBlobStore(ctx context.Context, tag string) *linkedBlobStore {
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return &linkedBlobStore{
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blobStore: ts.blobStore,
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repository: ts.repository,
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ctx: ctx,
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linkPath: func(pm *pathMapper, name string, dgst digest.Digest) (string, error) {
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return pm.path(manifestTagIndexEntryLinkPathSpec{
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name: name,
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tag: tag,
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revision: dgst,
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})
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},
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}
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}
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