Add IdentfyingLabels to CreateOrUpdateWithOptions

If the GenerateName field is set in the target resource, the
existing resource is searched for by the target's labels. However
this assumes the labels remain static for the lifetime of the
resource. If the labels are updated then the existing resource is
not found and a new one is created. To avoid this, allow the user
to specify which labels uniquely identify the resource by adding
an IdentfyingLabels field to CreateOrUpdateOptions.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

pkg/util/create_or_update_test.go

@@ -148,8 +148,23 @@ var _ = Describe("CreateOrUpdate function", func() {
 	t := newCreateOrUpdateTestDiver()
 
 	createOrUpdate := func(expResult util.OperationResult) error {
-		result, err := util.CreateOrUpdate[*unstructured.Unstructured](context.TODO(), resource.ForDynamic(t.client),
-			resource.MustToUnstructured(t.pod), t.mutateFn)
+		options := util.CreateOrUpdateOptions[*unstructured.Unstructured]{
+			Client:         resource.ForDynamic(t.client),
+			MutateOnUpdate: t.mutateFn,
+		}
+
+		if t.pod.GenerateName != "" {
+			options.IdentifyingLabels = map[string]string{}
+			for k, v := range t.pod.Labels {
+				options.IdentifyingLabels[k] = v
+			}
+
+			t.pod.Labels["new-label"] = "new-value"
+		}
+
+		options.Obj = resource.MustToUnstructured(t.pod)
+
+		result, _, err := util.CreateOrUpdateWithOptions[*unstructured.Unstructured](context.TODO(), options)
 		if err != nil && expResult != util.OperationResultNone {
 			return err
 		}
@@ -167,12 +182,6 @@ var _ = Describe("CreateOrUpdate function", func() {
 		})
 
 		Context("and a mutation function specified", func() {
-			BeforeEach(func() {
-				t.pod.Name = ""
-				t.pod.GenerateName = "name-prefix-"
-				t.pod.Labels = map[string]string{"label1": "value1", "label2": "value2"}
-			})
-
 			It("should invoke the function on create", func() {
 				result, created, err := util.CreateOrUpdateWithOptions[*unstructured.Unstructured](context.TODO(),
 					util.CreateOrUpdateOptions[*unstructured.Unstructured]{