125 lines
4.2 KiB
Go
125 lines
4.2 KiB
Go
package distribution
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import (
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"context"
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"fmt"
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"mime"
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"github.com/opencontainers/go-digest"
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)
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// Manifest represents a registry object specifying a set of
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// references and an optional target
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type Manifest interface {
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// References returns a list of objects which make up this manifest.
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// A reference is anything which can be represented by a
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// distribution.Descriptor. These can consist of layers, resources or other
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// manifests.
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//
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// While no particular order is required, implementations should return
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// them from highest to lowest priority. For example, one might want to
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// return the base layer before the top layer.
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References() []Descriptor
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// Payload provides the serialized format of the manifest, in addition to
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// the media type.
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Payload() (mediaType string, payload []byte, err error)
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}
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// ManifestBuilder creates a manifest allowing one to include dependencies.
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// Instances can be obtained from a version-specific manifest package. Manifest
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// specific data is passed into the function which creates the builder.
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type ManifestBuilder interface {
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// Build creates the manifest from his builder.
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Build(ctx context.Context) (Manifest, error)
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// References returns a list of objects which have been added to this
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// builder. The dependencies are returned in the order they were added,
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// which should be from base to head.
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References() []Descriptor
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// AppendReference includes the given object in the manifest after any
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// existing dependencies. If the add fails, such as when adding an
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// unsupported dependency, an error may be returned.
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//
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// The destination of the reference is dependent on the manifest type and
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// the dependency type.
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AppendReference(dependency Describable) error
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}
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// ManifestService describes operations on image manifests.
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type ManifestService interface {
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// Exists returns true if the manifest exists.
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Exists(ctx context.Context, dgst digest.Digest) (bool, error)
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// Get retrieves the manifest specified by the given digest
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Get(ctx context.Context, dgst digest.Digest, options ...ManifestServiceOption) (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 Manifest, options ...ManifestServiceOption) (digest.Digest, error)
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// Delete removes the manifest specified by the given digest. Deleting
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// a manifest that doesn't exist will return ErrManifestNotFound
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Delete(ctx context.Context, dgst digest.Digest) error
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}
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// ManifestEnumerator enables iterating over manifests
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type ManifestEnumerator interface {
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// Enumerate calls ingester for each manifest.
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Enumerate(ctx context.Context, ingester func(digest.Digest) error) error
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}
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// Describable is an interface for descriptors
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type Describable interface {
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Descriptor() Descriptor
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}
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// ManifestMediaTypes returns the supported media types for manifests.
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func ManifestMediaTypes() (mediaTypes []string) {
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for t := range mappings {
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if t != "" {
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mediaTypes = append(mediaTypes, t)
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}
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}
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return
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}
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// UnmarshalFunc implements manifest unmarshalling a given MediaType
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type UnmarshalFunc func([]byte) (Manifest, Descriptor, error)
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var mappings = make(map[string]UnmarshalFunc)
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// UnmarshalManifest looks up manifest unmarshal functions based on
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// MediaType
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func UnmarshalManifest(ctHeader string, p []byte) (Manifest, Descriptor, error) {
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// Need to look up by the actual media type, not the raw contents of
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// the header. Strip semicolons and anything following them.
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var mediaType string
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if ctHeader != "" {
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var err error
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mediaType, _, err = mime.ParseMediaType(ctHeader)
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if err != nil {
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return nil, Descriptor{}, err
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}
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}
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unmarshalFunc, ok := mappings[mediaType]
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if !ok {
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unmarshalFunc, ok = mappings[""]
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if !ok {
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return nil, Descriptor{}, fmt.Errorf("unsupported manifest media type and no default available: %s", mediaType)
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}
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}
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return unmarshalFunc(p)
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}
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// RegisterManifestSchema registers an UnmarshalFunc for a given schema type. This
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// should be called from specific
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func RegisterManifestSchema(mediaType string, u UnmarshalFunc) error {
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if _, ok := mappings[mediaType]; ok {
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return fmt.Errorf("manifest media type registration would overwrite existing: %s", mediaType)
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}
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mappings[mediaType] = u
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return nil
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}
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