107 lines
3.1 KiB
Go
107 lines
3.1 KiB
Go
package ocischema
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import (
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"context"
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"errors"
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"github.com/docker/distribution"
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"github.com/docker/distribution/manifest"
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"github.com/opencontainers/go-digest"
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v1 "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// Builder is a type for constructing manifests.
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type Builder struct {
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// bs is a BlobService used to publish the configuration blob.
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bs distribution.BlobService
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// configJSON references
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configJSON []byte
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// layers is a list of layer descriptors that gets built by successive
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// calls to AppendReference.
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layers []distribution.Descriptor
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// Annotations contains arbitrary metadata relating to the targeted content.
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annotations map[string]string
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// For testing purposes
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mediaType string
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}
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// NewManifestBuilder is used to build new manifests for the current schema
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// version. It takes a BlobService so it can publish the configuration blob
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// as part of the Build process, and annotations.
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func NewManifestBuilder(bs distribution.BlobService, configJSON []byte, annotations map[string]string) distribution.ManifestBuilder {
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mb := &Builder{
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bs: bs,
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configJSON: make([]byte, len(configJSON)),
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annotations: annotations,
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mediaType: v1.MediaTypeImageManifest,
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}
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copy(mb.configJSON, configJSON)
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return mb
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}
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// SetMediaType assigns the passed mediatype or error if the mediatype is not a
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// valid media type for oci image manifests currently: "" or "application/vnd.oci.image.manifest.v1+json"
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func (mb *Builder) SetMediaType(mediaType string) error {
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if mediaType != "" && mediaType != v1.MediaTypeImageManifest {
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return errors.New("invalid media type for OCI image manifest")
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}
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mb.mediaType = mediaType
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return nil
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}
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// Build produces a final manifest from the given references.
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func (mb *Builder) Build(ctx context.Context) (distribution.Manifest, error) {
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m := Manifest{
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Versioned: manifest.Versioned{
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SchemaVersion: 2,
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MediaType: mb.mediaType,
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},
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Layers: make([]distribution.Descriptor, len(mb.layers)),
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Annotations: mb.annotations,
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}
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copy(m.Layers, mb.layers)
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configDigest := digest.FromBytes(mb.configJSON)
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var err error
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m.Config, err = mb.bs.Stat(ctx, configDigest)
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switch err {
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case nil:
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// Override MediaType, since Put always replaces the specified media
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// type with application/octet-stream in the descriptor it returns.
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m.Config.MediaType = v1.MediaTypeImageConfig
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return FromStruct(m)
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case distribution.ErrBlobUnknown:
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// nop
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default:
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return nil, err
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}
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// Add config to the blob store
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m.Config, err = mb.bs.Put(ctx, v1.MediaTypeImageConfig, mb.configJSON)
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// Override MediaType, since Put always replaces the specified media
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// type with application/octet-stream in the descriptor it returns.
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m.Config.MediaType = v1.MediaTypeImageConfig
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if err != nil {
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return nil, err
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}
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return FromStruct(m)
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}
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// AppendReference adds a reference to the current ManifestBuilder.
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func (mb *Builder) AppendReference(d distribution.Describable) error {
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mb.layers = append(mb.layers, d.Descriptor())
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return nil
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}
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// References returns the current references added to this builder.
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func (mb *Builder) References() []distribution.Descriptor {
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return mb.layers
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}
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