ostree/ostree_transport.go
func (ref ostreeReference) PolicyConfigurationNamespaces() []string {
	s := strings.SplitN(ref.image, ":", 2)
	if len(s) != 2 { // Coverage: Should never happen, NewReference above ensures ref.image has a :tag.
		panic(fmt.Sprintf("Internal inconsistency: ref.image value %q does not have a :tag", ref.image))
	}
	name := s[0]
	res := []string{}
	for {
		res = append(res, fmt.Sprintf("%s:%s", ref.repo, name))

		lastSlash := strings.LastIndex(name, "/")
		if lastSlash == -1 {
			break
		}
		name = name[:lastSlash]
	}
	return res
}
func (ref ostreeReference) PolicyConfigurationNamespaces() []string {
	s := strings.SplitN(ref.image, ":", 2)
	if len(s) != 2 { // Coverage: Should never happen, NewReference above ensures ref.image has a :tag.
		panic(fmt.Sprintf("Internal inconsistency: ref.image value %q does not have a :tag", ref.image))
	}
	name := s[0]
	res := []string{}
	for {
		res = append(res, fmt.Sprintf("%s:%s", ref.repo, name))

		lastSlash := strings.LastIndex(name, "/")
		if lastSlash == -1 {
			break
		}
		name = name[:lastSlash]
	}
	return res
}
// PolicyConfigurationNamespaces returns a list of other policy configuration namespaces to search
// for if explicit configuration for PolicyConfigurationIdentity() is not set.  The list will be processed
// in order, terminating on first match, and an implicit "" is always checked at the end.
// It is STRONGLY recommended for the first element, if any, to be a prefix of PolicyConfigurationIdentity(),
// and each following element to be a prefix of the element preceding it.