kubectl: apply prune should fallback to basic delete when a resource has no reaper

hack/make-rules/test-cmd.sh

@@ -1111,6 +1111,14 @@ __EOF__
   kube::test::get_object_assert 'pods b' "{{${id_field}}}" 'b'
   kubectl delete pod/a pod/b
 
+  ## kubectl apply --prune should fallback to delete for non reapable types
+  kubectl apply --all --prune -f hack/testdata/prune-reap/a.yml 2>&1 "${kube_flags[@]}"
+  kube::test::get_object_assert 'pvc a-pvc' "{{${id_field}}}" 'a-pvc'
+  kubectl apply --all --prune -f hack/testdata/prune-reap/b.yml 2>&1 "${kube_flags[@]}"
+  kube::test::get_object_assert 'pvc b-pvc' "{{${id_field}}}" 'b-pvc'
+  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
+  kubectl delete pvc b-pvc 2>&1 "${kube_flags[@]}"
+
   ## kubectl run should create deployments or jobs
   # Pre-Condition: no Job exists
   kube::test::get_object_assert jobs "{{range.items}}{{$id_field}}:{{end}}" ''

hack/testdata/prune-reap/a.yml

@@ -0,0 +1,10 @@
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: a-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10G

hack/testdata/prune-reap/b.yml

@@ -0,0 +1,10 @@
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: b-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10G

pkg/kubectl/cmd/apply.go

@@ -343,10 +343,7 @@ func (p *pruner) prune(namespace string, mapping *meta.RESTMapping, shortOutput
 
 func (p *pruner) delete(namespace, name string, mapping *meta.RESTMapping, c resource.RESTClient) error {
 	if !p.cascade {
-		if err := resource.NewHelper(c, mapping).Delete(namespace, name); err != nil {
-			return err
-		}
-		return nil
+		return resource.NewHelper(c, mapping).Delete(namespace, name)
 	}
 	cs, err := p.clientsetFunc()
 	if err != nil {
@@ -354,7 +351,10 @@ func (p *pruner) delete(namespace, name string, mapping *meta.RESTMapping, c res
 	}
 	r, err := kubectl.ReaperFor(mapping.GroupVersionKind.GroupKind(), cs)
 	if err != nil {
-		return err
+		if _, ok := err.(*kubectl.NoSuchReaperError); !ok {
+			return err
+		}
+		return resource.NewHelper(c, mapping).Delete(namespace, name)
 	}
 	if err := r.Stop(namespace, name, 2*time.Minute, api.NewDeleteOptions(int64(p.gracePeriod))); err != nil {
 		return err