Function getBestReferenceType

docker/reference/reference.go:330–355

(ref reference)

}

func getBestReferenceType(ref reference) Reference {
	if ref.Name() == "" {
		// Allow digest only references
		if ref.digest != "" {
			return digestReference(ref.digest)
		}
		return nil
	}
	if ref.tag == "" {
		if ref.digest != "" {
			return canonicalReference{
				namedRepository: ref.namedRepository,
				digest:          ref.digest,
			}
		}
		return ref.namedRepository
	}
	if ref.digest == "" {
		return taggedReference{
			namedRepository: ref.namedRepository,
			tag:             ref.tag,
		}
	}

	return ref
}

type reference struct {
	namedRepository