Merge pull request #2426 from dmvolod/issue-2425

📖 Utilize controllerutil.ContainsFinalizer inside kubebuilder book CronJob finalizer example

Author: k8s-ci-robot

docs/book/src/cronjob-tutorial/testdata/finalizer_example.go

@@ -66,15 +66,15 @@ func (r *CronJobReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ct
 		// The object is not being deleted, so if it does not have our finalizer,
 		// then lets add the finalizer and update the object. This is equivalent
 		// registering our finalizer.
-		if !containsString(cronJob.GetFinalizers(), myFinalizerName) {
+		if !controllerutil.ContainsFinalizer(cronJob, myFinalizerName) {
 			controllerutil.AddFinalizer(cronJob, myFinalizerName)
 			if err := r.Update(ctx, cronJob); err != nil {
 				return ctrl.Result{}, err
 			}
 		}
 	} else {
 		// The object is being deleted
-		if containsString(cronJob.GetFinalizers(), myFinalizerName) {
+		if controllerutil.ContainsFinalizer(cronJob, myFinalizerName) {
 			// our finalizer is present, so lets handle any external dependency
 			if err := r.deleteExternalResources(cronJob); err != nil {
 				// if fail to delete the external dependency here, return with error
@@ -106,12 +106,3 @@ func (r *Reconciler) deleteExternalResources(cronJob *batch.CronJob) error {
 	// multiple times for same object.
 }
 
-// Helper functions to check and remove string from a slice of strings.
-func containsString(slice []string, s string) bool {
-	for _, item := range slice {
-		if item == s {
-			return true
-		}
-	}
-	return false
-}