Call MutateFn on CreateOrUpdate regardless of the operation

Author: calind

pkg/controller/controllerutil/controllerutil.go

@@ -116,18 +116,23 @@ const ( // They should complete the sentence "Deployment default/foo has been ..
 
 // CreateOrUpdate creates or updates the given object obj in the Kubernetes
 // cluster. The object's desired state should be reconciled with the existing
-// state using the passed in ReconcileFn. obj must be a struct pointer so that
+// state using the passed in MutateFn. obj is just a struct pointer so that
 // obj can be updated with the content returned by the Server.
 //
+// The MutateFn is called regardless of creating or updating an object.
+//
 // It returns the executed operation and an error.
-func CreateOrUpdate(ctx context.Context, c client.Client, obj runtime.Object, f MutateFn) (OperationResult, error) {
+func CreateOrUpdate(ctx context.Context, c client.Client, obj runtime.Object, f MutateFn) (OperationResult, error) { // nolint: gocyclo
 	key, err := client.ObjectKeyFromObject(obj)
 	if err != nil {
 		return OperationResultNone, err
 	}
 
 	if err := c.Get(ctx, key, obj); err != nil {
 		if errors.IsNotFound(err) {
+			if err := f(obj); err != nil {
+				return OperationResultNone, err
+			}
 			if err := c.Create(ctx, obj); err != nil {
 				return OperationResultNone, err
 			}

pkg/controller/controllerutil/controllerutil_test.go

@@ -151,8 +151,6 @@ var _ = Describe("Controllerutil", func() {
 				},
 			}
 
-			deploy.Spec = deplSpec
-
 			deplKey = types.NamespacedName{
 				Name:      deploy.Name,
 				Namespace: deploy.Namespace,
@@ -162,15 +160,20 @@ var _ = Describe("Controllerutil", func() {
 		It("creates a new object if one doesn't exists", func() {
 			op, err := controllerutil.CreateOrUpdate(context.TODO(), c, deploy, deploymentSpecr(deplSpec))
 
-			By("returning OperationResultCreated")
-			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultCreated))
-
 			By("returning no error")
 			Expect(err).NotTo(HaveOccurred())
 
+			By("returning OperationResultCreated")
+			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultCreated))
+
 			By("actually having the deployment created")
 			fetched := &appsv1.Deployment{}
 			Expect(c.Get(context.TODO(), deplKey, fetched)).To(Succeed())
+
+			By("applying MutateFn")
+			Expect(fetched.Spec.Template.Spec.Containers).To(HaveLen(1))
+			Expect(fetched.Spec.Template.Spec.Containers[0].Name).To(Equal(deplSpec.Template.Spec.Containers[0].Name))
+			Expect(fetched.Spec.Template.Spec.Containers[0].Image).To(Equal(deplSpec.Template.Spec.Containers[0].Image))
 		})
 
 		It("updates existing object", func() {
@@ -180,12 +183,12 @@ var _ = Describe("Controllerutil", func() {
 			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultCreated))
 
 			op, err = controllerutil.CreateOrUpdate(context.TODO(), c, deploy, deploymentScaler(scale))
-			By("returning OperationResultUpdated")
-			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultUpdated))
-
 			By("returning no error")
 			Expect(err).NotTo(HaveOccurred())
 
+			By("returning OperationResultUpdated")
+			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultUpdated))
+
 			By("actually having the deployment scaled")
 			fetched := &appsv1.Deployment{}
 			Expect(c.Get(context.TODO(), deplKey, fetched)).To(Succeed())
@@ -199,12 +202,11 @@ var _ = Describe("Controllerutil", func() {
 			Expect(err).NotTo(HaveOccurred())
 
 			op, err = controllerutil.CreateOrUpdate(context.TODO(), c, deploy, deploymentIdentity)
+			By("returning no error")
+			Expect(err).NotTo(HaveOccurred())
 
 			By("returning OperationResultNone")
 			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultNone))
-
-			By("returning no error")
-			Expect(err).NotTo(HaveOccurred())
 		})
 
 		It("errors when reconcile renames an object", func() {
@@ -215,11 +217,11 @@ var _ = Describe("Controllerutil", func() {
 
 			op, err = controllerutil.CreateOrUpdate(context.TODO(), c, deploy, deploymentRenamer)
 
-			By("returning OperationResultNone")
-			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultNone))
-
 			By("returning error")
 			Expect(err).To(HaveOccurred())
+
+			By("returning OperationResultNone")
+			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultNone))
 		})
 
 		It("errors when object namespace changes", func() {
@@ -230,11 +232,11 @@ var _ = Describe("Controllerutil", func() {
 
 			op, err = controllerutil.CreateOrUpdate(context.TODO(), c, deploy, deploymentNamespaceChanger)
 
-			By("returning OperationResultNone")
-			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultNone))
-
 			By("returning error")
 			Expect(err).To(HaveOccurred())
+
+			By("returning OperationResultNone")
+			Expect(op).To(BeEquivalentTo(controllerutil.OperationResultNone))
 		})
 
 		It("aborts immediately if there was an error initially retrieving the object", func() {