forked from TrueCloudLab/distribution
Merge pull request #3365 from brackendawson/3122-remove-workaround
Remove workaround from 2.1.1 for faulty 2.1.0 manifest links
This commit is contained in:
Milos Gajdos
GitHub
commit
fb2188868d
3 changed files with 37 additions and 90 deletions
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@ -32,13 +32,11 @@ type linkedBlobStore struct {
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deleteEnabled bool
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resumableDigestEnabled bool
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// linkPathFns specifies one or more path functions allowing one to
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// control the repository blob link set to which the blob store
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// dispatches. This is required because manifest and layer blobs have not
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// yet been fully merged. At some point, this functionality should be
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// removed the blob links folder should be merged. The first entry is
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// treated as the "canonical" link location and will be used for writes.
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linkPathFns []linkPathFunc
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// linkPath allows one to control the repository blob link set to which
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// the blob store dispatches. This is required because manifest and layer
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// blobs have not yet been fully merged. At some point, this functionality
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// should be removed an the blob links folder should be merged.
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linkPath linkPathFunc
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// linkDirectoryPathSpec locates the root directories in which one might find links
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linkDirectoryPathSpec pathSpec
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@ -338,16 +336,13 @@ func (lbs *linkedBlobStore) linkBlob(ctx context.Context, canonical distribution
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// Don't make duplicate links.
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seenDigests := make(map[digest.Digest]struct{}, len(dgsts))
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// only use the first link
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linkPathFn := lbs.linkPathFns[0]
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for _, dgst := range dgsts {
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if _, seen := seenDigests[dgst]; seen {
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continue
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}
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seenDigests[dgst] = struct{}{}
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blobLinkPath, err := linkPathFn(lbs.repository.Named().Name(), dgst)
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blobLinkPath, err := lbs.linkPath(lbs.repository.Named().Name(), dgst)
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if err != nil {
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return err
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}
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@ -364,46 +359,31 @@ type linkedBlobStatter struct {
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*blobStore
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repository distribution.Repository
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// linkPathFns specifies one or more path functions allowing one to
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// control the repository blob link set to which the blob store
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// dispatches. This is required because manifest and layer blobs have not
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// yet been fully merged. At some point, this functionality should be
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// removed an the blob links folder should be merged. The first entry is
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// treated as the "canonical" link location and will be used for writes.
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linkPathFns []linkPathFunc
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// linkPath allows one to control the repository blob link set to which
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// the blob store dispatches. This is required because manifest and layer
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// blobs have not yet been fully merged. At some point, this functionality
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// should be removed an the blob links folder should be merged.
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linkPath linkPathFunc
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}
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var _ distribution.BlobDescriptorService = &linkedBlobStatter{}
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func (lbs *linkedBlobStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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var (
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found bool
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target digest.Digest
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)
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// try the many link path functions until we get success or an error that
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// is not PathNotFoundError.
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for _, linkPathFn := range lbs.linkPathFns {
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var err error
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target, err = lbs.resolveWithLinkFunc(ctx, dgst, linkPathFn)
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if err == nil {
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found = true
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break // success!
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blobLinkPath, err := lbs.linkPath(lbs.repository.Named().Name(), dgst)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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target, err := lbs.blobStore.readlink(ctx, blobLinkPath)
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if err != nil {
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switch err := err.(type) {
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case driver.PathNotFoundError:
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// do nothing, just move to the next linkPathFn
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return distribution.Descriptor{}, distribution.ErrBlobUnknown
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default:
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return distribution.Descriptor{}, err
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}
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}
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if !found {
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return distribution.Descriptor{}, distribution.ErrBlobUnknown
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}
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if target != dgst {
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// Track when we are doing cross-digest domain lookups. ie, sha512 to sha256.
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dcontext.GetLogger(ctx).Warnf("looking up blob with canonical target: %v -> %v", dgst, target)
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@ -416,37 +396,12 @@ func (lbs *linkedBlobStatter) Stat(ctx context.Context, dgst digest.Digest) (dis
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}
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func (lbs *linkedBlobStatter) Clear(ctx context.Context, dgst digest.Digest) (err error) {
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// clear any possible existence of a link described in linkPathFns
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for _, linkPathFn := range lbs.linkPathFns {
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blobLinkPath, err := linkPathFn(lbs.repository.Named().Name(), dgst)
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blobLinkPath, err := lbs.linkPath(lbs.repository.Named().Name(), dgst)
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if err != nil {
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return err
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}
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err = lbs.blobStore.driver.Delete(ctx, blobLinkPath)
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if err != nil {
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switch err := err.(type) {
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case driver.PathNotFoundError:
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continue // just ignore this error and continue
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default:
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return err
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}
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}
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}
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return nil
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}
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// resolveTargetWithFunc allows us to read a link to a resource with different
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// linkPathFuncs to let us try a few different paths before returning not
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// found.
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func (lbs *linkedBlobStatter) resolveWithLinkFunc(ctx context.Context, dgst digest.Digest, linkPathFn linkPathFunc) (digest.Digest, error) {
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blobLinkPath, err := linkPathFn(lbs.repository.Named().Name(), dgst)
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if err != nil {
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return "", err
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}
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return lbs.blobStore.readlink(ctx, blobLinkPath)
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return lbs.blobStore.driver.Delete(ctx, blobLinkPath)
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}
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func (lbs *linkedBlobStatter) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
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@ -215,19 +215,12 @@ func (repo *repository) Tags(ctx context.Context) distribution.TagService {
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// may be context sensitive in the future. The instance should be used similar
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// to a request local.
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func (repo *repository) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {
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manifestLinkPathFns := []linkPathFunc{
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// NOTE(stevvooe): Need to search through multiple locations since
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// 2.1.0 unintentionally linked into _layers.
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manifestRevisionLinkPath,
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blobLinkPath,
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}
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manifestDirectoryPathSpec := manifestRevisionsPathSpec{name: repo.name.Name()}
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var statter distribution.BlobDescriptorService = &linkedBlobStatter{
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blobStore: repo.blobStore,
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repository: repo,
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linkPathFns: manifestLinkPathFns,
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linkPath: manifestRevisionLinkPath,
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}
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if repo.registry.blobDescriptorServiceFactory != nil {
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@ -243,7 +236,7 @@ func (repo *repository) Manifests(ctx context.Context, options ...distribution.M
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// TODO(stevvooe): linkPath limits this blob store to only
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// manifests. This instance cannot be used for blob checks.
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linkPathFns: manifestLinkPathFns,
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linkPath: manifestRevisionLinkPath,
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linkDirectoryPathSpec: manifestDirectoryPathSpec,
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}
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@ -308,7 +301,7 @@ func (repo *repository) Blobs(ctx context.Context) distribution.BlobStore {
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var statter distribution.BlobDescriptorService = &linkedBlobStatter{
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blobStore: repo.blobStore,
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repository: repo,
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linkPathFns: []linkPathFunc{blobLinkPath},
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linkPath: blobLinkPath,
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}
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if repo.descriptorCache != nil {
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@ -329,7 +322,7 @@ func (repo *repository) Blobs(ctx context.Context) distribution.BlobStore {
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// TODO(stevvooe): linkPath limits this blob store to only layers.
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// This instance cannot be used for manifest checks.
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linkPathFns: []linkPathFunc{blobLinkPath},
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linkPath: blobLinkPath,
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linkDirectoryPathSpec: layersPathSpec{name: repo.name.Name()},
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deleteEnabled: repo.registry.deleteEnabled,
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resumableDigestEnabled: repo.resumableDigestEnabled,
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@ -124,14 +124,13 @@ func (ts *tagStore) linkedBlobStore(ctx context.Context, tag string) *linkedBlob
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blobStore: ts.blobStore,
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repository: ts.repository,
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ctx: ctx,
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linkPathFns: []linkPathFunc{func(name string, dgst digest.Digest) (string, error) {
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linkPath: func(name string, dgst digest.Digest) (string, error) {
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return pathFor(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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}
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@ -187,11 +186,11 @@ func (ts *tagStore) ManifestDigests(ctx context.Context, tag string) ([]digest.D
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blobAccessController: &linkedBlobStatter{
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blobStore: ts.blobStore,
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repository: ts.repository,
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linkPathFns: []linkPathFunc{manifestRevisionLinkPath},
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linkPath: manifestRevisionLinkPath,
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},
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repository: ts.repository,
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ctx: ctx,
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linkPathFns: []linkPathFunc{tagLinkPath},
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linkPath: tagLinkPath,
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linkDirectoryPathSpec: manifestTagIndexPathSpec{
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name: ts.repository.Named().Name(),
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tag: tag,
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