docker/cache.go
func bicTransportScope(ref dockerReference) types.BICTransportScope {
	// Blobs can be reused across the whole registry.
	return types.BICTransportScope{Opaque: reference.Domain(ref.ref)}
}
func bicTransportScope(ref dockerReference) types.BICTransportScope {
	// Blobs can be reused across the whole registry.
	return types.BICTransportScope{Opaque: reference.Domain(ref.ref)}
}
// bicTransportScope returns a BICTransportScope appropriate for ref.