forked from TrueCloudLab/distribution
140 lines
4.4 KiB
Go
140 lines
4.4 KiB
Go
package storage
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import (
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"fmt"
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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"
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"github.com/docker/distribution/manifest/manifestlist"
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"github.com/docker/distribution/manifest/schema1"
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"github.com/docker/distribution/manifest/schema2"
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)
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// A ManifestHandler gets and puts manifests of a particular type.
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type ManifestHandler interface {
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// Unmarshal unmarshals the manifest from a byte slice.
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Unmarshal(ctx context.Context, dgst digest.Digest, content []byte) (distribution.Manifest, error)
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// Put creates or updates the given manifest returning the manifest digest.
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Put(ctx context.Context, manifest distribution.Manifest, skipDependencyVerification bool) (digest.Digest, error)
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}
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// SkipLayerVerification allows a manifest to be Put before its
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// layers are on the filesystem
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func SkipLayerVerification() distribution.ManifestServiceOption {
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return skipLayerOption{}
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}
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type skipLayerOption struct{}
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func (o skipLayerOption) Apply(m distribution.ManifestService) error {
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if ms, ok := m.(*manifestStore); ok {
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ms.skipDependencyVerification = true
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return nil
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}
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return fmt.Errorf("skip layer verification only valid for manifestStore")
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}
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type manifestStore struct {
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repository *repository
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blobStore *linkedBlobStore
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ctx context.Context
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skipDependencyVerification bool
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schema1Handler ManifestHandler
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schema2Handler ManifestHandler
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manifestListHandler ManifestHandler
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}
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var _ distribution.ManifestService = &manifestStore{}
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func (ms *manifestStore) Exists(ctx context.Context, dgst digest.Digest) (bool, error) {
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context.GetLogger(ms.ctx).Debug("(*manifestStore).Exists")
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_, err := ms.blobStore.Stat(ms.ctx, dgst)
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if err != nil {
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if err == distribution.ErrBlobUnknown {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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func (ms *manifestStore) Get(ctx context.Context, dgst digest.Digest, options ...distribution.ManifestServiceOption) (distribution.Manifest, error) {
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context.GetLogger(ms.ctx).Debug("(*manifestStore).Get")
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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 := ms.blobStore.Get(ctx, dgst)
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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: ms.repository.Name(),
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Revision: dgst,
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}
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}
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return nil, err
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}
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var versioned manifest.Versioned
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if err = json.Unmarshal(content, &versioned); err != nil {
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return nil, err
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}
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switch versioned.SchemaVersion {
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case 1:
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return ms.schema1Handler.Unmarshal(ctx, dgst, content)
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case 2:
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// This can be an image manifest or a manifest list
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var mediaType struct {
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MediaType string `json:"mediaType"`
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}
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if err = json.Unmarshal(content, &mediaType); err != nil {
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return nil, err
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}
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switch mediaType.MediaType {
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case schema2.MediaTypeManifest:
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return ms.schema2Handler.Unmarshal(ctx, dgst, content)
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case manifestlist.MediaTypeManifestList:
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return ms.manifestListHandler.Unmarshal(ctx, dgst, content)
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default:
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return nil, distribution.ErrManifestVerification{fmt.Errorf("unrecognized manifest content type %s", mediaType.MediaType)}
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}
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}
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return nil, fmt.Errorf("unrecognized manifest schema version %d", versioned.SchemaVersion)
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}
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func (ms *manifestStore) Put(ctx context.Context, manifest distribution.Manifest, options ...distribution.ManifestServiceOption) (digest.Digest, error) {
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context.GetLogger(ms.ctx).Debug("(*manifestStore).Put")
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switch manifest.(type) {
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case *schema1.SignedManifest:
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return ms.schema1Handler.Put(ctx, manifest, ms.skipDependencyVerification)
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case *schema2.DeserializedManifest:
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return ms.schema2Handler.Put(ctx, manifest, ms.skipDependencyVerification)
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case *manifestlist.DeserializedManifestList:
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return ms.manifestListHandler.Put(ctx, manifest, ms.skipDependencyVerification)
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}
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return "", fmt.Errorf("unrecognized manifest type %T", manifest)
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}
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// Delete removes the revision of the specified manfiest.
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func (ms *manifestStore) Delete(ctx context.Context, dgst digest.Digest) error {
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context.GetLogger(ms.ctx).Debug("(*manifestStore).Delete")
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return ms.blobStore.Delete(ctx, dgst)
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}
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func (ms *manifestStore) Enumerate(ctx context.Context, manifests []distribution.Manifest, last distribution.Manifest) (n int, err error) {
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return 0, distribution.ErrUnsupported
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}
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