registry

type Client interface {
	// Digest returns the digest of the given image or an error if the image does not exist or the digest is unavailable.
	Digest(image.Name) (image.Digest, error)

	// Copy copies the given source image to the given target and returns the image's digest (which is preserved) and
	// the size in bytes of the raw image manifest.
	Copy(source image.Name, target image.Name) (image.Digest, int64, error)

	// NewLayout creates a Layout for the Client and creates a corresponding directory containing a new OCI image layout at
	// the given file system path.
	NewLayout(path string) (Layout, error)

	// ReadLayout creates a Layout for the Client from the given file system path of a directory containing an existing
	// OCI image layout.
	ReadLayout(path string) (Layout, error)
}

type Image interface {
	// Digest returns the repository digest of the image.
	Digest() (image.Digest, error)

	// Write writes the image to a given reference and returns the image's digest and size.
	Write(target image.Name) (image.Digest, int64, error)
}

type Layout interface {
	// Add adds the image at the given image reference to the layout and returns the image's digest.
	Add(n image.Name) (image.Digest, error)

	// Push pushes the image with the given digest from the layout to the given image reference.
	Push(digest image.Digest, name image.Name) error

	// Find returns the digest of an image in the layout with the given image reference.
	Find(n image.Name) (image.Digest, error)
}