ea5b999fc0
In support of making the storage API ready for supporting notifications and mirroring, we've begun the process of paring down the storage model. The process started by creating a central Registry interface. From there, the common name argument on the LayerService and ManifestService was factored into a Repository interface. The rest of the changes directly follow from this. An interface wishlist was added, suggesting a direction to take the registry package that should support the distribution project's future goals. As these objects move out of the storage package and we implement a Registry backed by the http client, these design choices will start getting validation. Signed-off-by: Stephen J Day <stephen.day@docker.com>
157 lines
3.3 KiB
Go
157 lines
3.3 KiB
Go
package storage
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import (
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"path"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/storagedriver"
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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
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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.pm.path(manifestTagPathSpec{
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name: ts.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.driver.List(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, ErrUnknownRepository{Name: ts.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.pm.path(manifestTagCurrentPathSpec{
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name: ts.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.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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indexEntryPath, err := ts.pm.path(manifestTagIndexEntryPathSpec{
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name: ts.Name(),
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tag: tag,
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revision: revision,
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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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currentPath, err := ts.pm.path(manifestTagCurrentPathSpec{
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name: ts.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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// Link into the index
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if err := ts.blobStore.link(indexEntryPath, 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(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.pm.path(manifestTagCurrentPathSpec{
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name: ts.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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if exists, err := exists(ts.driver, currentPath); err != nil {
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return "", err
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} else if !exists {
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return "", ErrUnknownManifest{Name: ts.Name(), Tag: tag}
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}
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revision, err := ts.blobStore.readlink(currentPath)
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if err != nil {
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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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// revisions returns all revisions with the specified name and tag.
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func (ts *tagStore) revisions(tag string) ([]digest.Digest, error) {
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manifestTagIndexPath, err := ts.pm.path(manifestTagIndexPathSpec{
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name: ts.Name(),
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tag: tag,
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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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// TODO(stevvooe): Need to append digest alg to get listing of revisions.
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manifestTagIndexPath = path.Join(manifestTagIndexPath, "sha256")
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entries, err := ts.driver.List(manifestTagIndexPath)
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if err != nil {
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return nil, err
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}
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var revisions []digest.Digest
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for _, entry := range entries {
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revisions = append(revisions, digest.NewDigestFromHex("sha256", path.Base(entry)))
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}
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return revisions, 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.pm.path(manifestTagPathSpec{
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name: ts.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.driver.Delete(tagPath)
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}
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