84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package schema2
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import (
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/opencontainers/go-digest"
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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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// configMediaType is media type used to describe configuration
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configMediaType string
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// configJSON references
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configJSON []byte
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// dependencies is a list of descriptors that gets built by successive
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// calls to AppendReference. In case of image configuration these are layers.
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dependencies []distribution.Descriptor
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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.
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func NewManifestBuilder(bs distribution.BlobService, configMediaType string, configJSON []byte) distribution.ManifestBuilder {
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mb := &builder{
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bs: bs,
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configMediaType: configMediaType,
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configJSON: make([]byte, len(configJSON)),
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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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// 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: SchemaVersion,
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Layers: make([]distribution.Descriptor, len(mb.dependencies)),
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}
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copy(m.Layers, mb.dependencies)
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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 = mb.configMediaType
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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, mb.configMediaType, 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 = mb.configMediaType
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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.dependencies = append(mb.dependencies, 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.dependencies
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}
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