distribution/manifest/schema2/builder.go

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package schema2
import (
"context"
"github.com/distribution/distribution/v3"
)
// builder is a type for constructing manifests.
type builder struct {
// configDescriptor is used to describe configuration
configDescriptor distribution.Descriptor
// configJSON references
configJSON []byte
// dependencies is a list of descriptors that gets built by successive
// calls to AppendReference. In case of image configuration these are layers.
dependencies []distribution.Descriptor
}
// NewManifestBuilder is used to build new manifests for the current schema
// version. It takes a BlobService so it can publish the configuration blob
// as part of the Build process.
func NewManifestBuilder(configDescriptor distribution.Descriptor, configJSON []byte) distribution.ManifestBuilder {
mb := &builder{
configDescriptor: configDescriptor,
configJSON: make([]byte, len(configJSON)),
}
copy(mb.configJSON, configJSON)
return mb
}
// Build produces a final manifest from the given references.
func (mb *builder) Build(ctx context.Context) (distribution.Manifest, error) {
m := Manifest{
Versioned: SchemaVersion,
Layers: make([]distribution.Descriptor, len(mb.dependencies)),
}
copy(m.Layers, mb.dependencies)
m.Config = mb.configDescriptor
return FromStruct(m)
}
// AppendReference adds a reference to the current ManifestBuilder.
func (mb *builder) AppendReference(d distribution.Describable) error {
mb.dependencies = append(mb.dependencies, d.Descriptor())
return nil
}
// References returns the current references added to this builder.
func (mb *builder) References() []distribution.Descriptor {
return mb.dependencies
}