ostree/ostree_transport.go
func (ref ostreeReference) StringWithinTransport() string {
	return fmt.Sprintf("%s@%s", ref.image, ref.repo)
}
func (ref ostreeReference) StringWithinTransport() string {
	return fmt.Sprintf("%s@%s", ref.image, ref.repo)
}
// StringWithinTransport returns a string representation of the reference, which MUST be such that
// reference.Transport().ParseReference(reference.StringWithinTransport()) returns an equivalent reference.
// NOTE: The returned string is not promised to be equal to the original input to ParseReference;
// e.g. default attribute values omitted by the user may be filled in in the return value, or vice versa.
// WARNING: Do not use the return value in the UI to describe an image, it does not contain the Transport().Name() prefix.