kyaml/fn/framework ensures the annotation output format matches the input

If the input only contains legacy format anntations (path, index, id), the
output will be the same.

kyaml/kio/kioutil/kioutil.go

@@ -44,18 +44,27 @@ const (
 )
 
 func GetFileAnnotations(rn *yaml.RNode) (string, string, error) {
-	if err := CopyLegacyAnnotations(rn); err != nil {
-		return "", "", err
+	annotations := rn.GetAnnotations()
+	path, found := annotations[PathAnnotation]
+	if !found {
+		path = annotations[LegacyPathAnnotation]
 	}
-	meta, err := rn.GetMeta()
-	if err != nil {
-		return "", "", err
+	index, found := annotations[IndexAnnotation]
+	if !found {
+		index = annotations[LegacyIndexAnnotation]
 	}
-	path := meta.Annotations[PathAnnotation]
-	index := meta.Annotations[IndexAnnotation]
 	return path, index, nil
 }
 
+func GetIdAnnotation(rn *yaml.RNode) string {
+	annotations := rn.GetAnnotations()
+	id, found := annotations[IdAnnotation]
+	if !found {
+		id = annotations[LegacyIdAnnotation]
+	}
+	return id
+}
+
 func CopyLegacyAnnotations(rn *yaml.RNode) error {
 	meta, err := rn.GetMeta()
 	if err != nil {
@@ -377,13 +386,15 @@ func ConfirmInternalAnnotationUnchanged(r1 *yaml.RNode, r2 *yaml.RNode, exclusio
 	return nil
 }
 
-// GetInternalAnnotations returns a map of all the annotations of the provided RNode that begin
-// with the prefix `internal.config.kubernetes.io`
+// GetInternalAnnotations returns a map of all the annotations of the provided
+// RNode that satisfies one of the following: 1) begin with the prefix
+// `internal.config.kubernetes.io` 2) is one of `config.kubernetes.io/path`,
+// `config.kubernetes.io/index` and `config.k8s.io/id`.
 func GetInternalAnnotations(rn *yaml.RNode) map[string]string {
 	annotations := rn.GetAnnotations()
 	result := make(map[string]string)
 	for k, v := range annotations {
-		if strings.HasPrefix(k, internalPrefix) {
+		if strings.HasPrefix(k, internalPrefix) || k == LegacyPathAnnotation || k == LegacyIndexAnnotation || k == LegacyIdAnnotation {
 			result[k] = v
 		}
 	}