docker/docker_transport.go
func (ref dockerReference) PolicyConfigurationIdentity() string {
	res, err := policyconfiguration.DockerReferenceIdentity(ref.ref)
	if res == "" || err != nil { // Coverage: Should never happen, NewReference above should refuse values which could cause a failure.
		panic(fmt.Sprintf("Internal inconsistency: policyconfiguration.DockerReferenceIdentity returned %#v, %v", res, err))
	}
	return res
}
func (ref dockerReference) PolicyConfigurationIdentity() string {
	res, err := policyconfiguration.DockerReferenceIdentity(ref.ref)
	if res == "" || err != nil { // Coverage: Should never happen, NewReference above should refuse values which could cause a failure.
		panic(fmt.Sprintf("Internal inconsistency: policyconfiguration.DockerReferenceIdentity returned %#v, %v", res, err))
	}
	return res
}
// PolicyConfigurationIdentity returns a string representation of the reference, suitable for policy lookup.
// This MUST reflect user intent, not e.g. after processing of third-party redirects or aliases;
// The value SHOULD be fully explicit about its semantics, with no hidden defaults, AND canonical
// (i.e. various references with exactly the same semantics should return the same configuration identity)
// It is fine for the return value to be equal to StringWithinTransport(), and it is desirable but
// not required/guaranteed that it will be a valid input to Transport().ParseReference().
// Returns "" if configuration identities for these references are not supported.