PVC Protection Alpha Feature E2E Tests

PVC Protection alpha feature was introduced in PRs:
- kubernetes#55824
- kubernetes#55873

That's why E2E tests for this feature are added.

test/e2e/storage/BUILD

@@ -19,6 +19,7 @@ go_library(
         "persistent_volumes-vsphere.go",
         "pv_reclaimpolicy.go",
         "pvc_label_selector.go",
+        "pvc_protection.go",
         "volume_expand.go",
         "volume_io.go",
         "volume_metrics.go",
@@ -49,6 +50,8 @@ go_library(
         "//pkg/cloudprovider/providers/vsphere/vclib:go_default_library",
         "//pkg/kubelet/apis:go_default_library",
         "//pkg/kubelet/metrics:go_default_library",
+        "//pkg/util/slice:go_default_library",
+        "//pkg/volume/util:go_default_library",
         "//pkg/volume/util/volumehelper:go_default_library",
         "//test/e2e/framework:go_default_library",
         "//test/e2e/framework/metrics:go_default_library",

test/e2e/storage/pvc_protection.go

@@ -0,0 +1,125 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package storage
+
+import (
+	"fmt"
+	"time"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"k8s.io/api/core/v1"
+	apierrs "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/pkg/util/slice"
+	volumeutil "k8s.io/kubernetes/pkg/volume/util"
+	"k8s.io/kubernetes/test/e2e/framework"
+)
+
+var _ = SIGDescribe("PVC Protection [Feature:PVCProtection]", func() {
+	var (
+		client                  clientset.Interface
+		nameSpace               string
+		err                     error
+		pvc                     *v1.PersistentVolumeClaim
+		pvcCreatedAndNotDeleted bool
+	)
+
+	f := framework.NewDefaultFramework("pvc-protection")
+	BeforeEach(func() {
+		client = f.ClientSet
+		nameSpace = f.Namespace.Name
+		framework.ExpectNoError(framework.WaitForAllNodesSchedulable(client, framework.TestContext.NodeSchedulableTimeout))
+
+		By("Creating a PVC")
+		suffix := "pvc-protection"
+		defaultSC := getDefaultStorageClassName(client)
+		testStorageClass := storageClassTest{
+			claimSize: "1Gi",
+		}
+		pvc = newClaim(testStorageClass, nameSpace, suffix)
+		pvc.Spec.StorageClassName = &defaultSC
+		pvc, err = client.CoreV1().PersistentVolumeClaims(pvc.Namespace).Create(pvc)
+		Expect(err).NotTo(HaveOccurred(), "Error creating PVC")
+		pvcCreatedAndNotDeleted = true
+
+		By("Waiting for PVC to become Bound")
+		err = framework.WaitForPersistentVolumeClaimPhase(v1.ClaimBound, client, nameSpace, pvc.Name, framework.Poll, framework.ClaimProvisionTimeout)
+		Expect(err).NotTo(HaveOccurred(), "Failed waiting for PVC to be bound %v", err)
+
+		By("Checking that PVC Protection finalizer is set")
+		pvc, err = client.CoreV1().PersistentVolumeClaims(pvc.Namespace).Get(pvc.Name, metav1.GetOptions{})
+		Expect(err).NotTo(HaveOccurred(), "While getting PVC status")
+		Expect(slice.ContainsString(pvc.ObjectMeta.Finalizers, volumeutil.PVCProtectionFinalizer, nil)).To(BeTrue())
+	})
+
+	AfterEach(func() {
+		if pvcCreatedAndNotDeleted {
+			framework.DeletePersistentVolumeClaim(client, pvc.Name, nameSpace)
+		}
+	})
+
+	It("Verify \"immediate\" deletion of a PVC that is not in active use by a pod", func() {
+		By("Deleting the PVC")
+		err = client.CoreV1().PersistentVolumeClaims(pvc.Namespace).Delete(pvc.Name, metav1.NewDeleteOptions(0))
+		Expect(err).NotTo(HaveOccurred(), "Error deleting PVC")
+		waitForPersistentVolumeClaimBeRemoved(client, pvc.Namespace, pvc.Name, framework.Poll, framework.ClaimProvisionTimeout)
+		pvcCreatedAndNotDeleted = false
+	})
+
+	It("Verify that PVC in active use by a pod is not removed immediatelly", func() {
+		By("Creating a Pod that becomes Running and therefore is actively using the PVC")
+		pvcClaims := []*v1.PersistentVolumeClaim{pvc}
+		pod, err := framework.CreatePod(client, nameSpace, nil, pvcClaims, false, "")
+		Expect(err).NotTo(HaveOccurred(), "While creating pod that uses the PVC or waiting for the Pod to become Running")
+
+		By("Deleting the PVC, however, the PVC must not be removed from the system as it's in active use by a pod")
+		err = client.CoreV1().PersistentVolumeClaims(pvc.Namespace).Delete(pvc.Name, metav1.NewDeleteOptions(0))
+		Expect(err).NotTo(HaveOccurred(), "Error deleting PVC")
+
+		By("Checking that the PVC status is Terminating")
+		pvc, err = client.CoreV1().PersistentVolumeClaims(pvc.Namespace).Get(pvc.Name, metav1.GetOptions{})
+		Expect(err).NotTo(HaveOccurred(), "While checking PVC status")
+		Expect(pvc.ObjectMeta.DeletionTimestamp).NotTo(Equal(nil))
+
+		By("Deleting the pod that uses the PVC")
+		err = framework.DeletePodWithWait(f, client, pod)
+		Expect(err).NotTo(HaveOccurred(), "Error terminating and deleting pod")
+
+		By("Checking that the PVC is automatically removed from the system because it's no longer in active use by a pod")
+		waitForPersistentVolumeClaimBeRemoved(client, pvc.Namespace, pvc.Name, framework.Poll, framework.ClaimProvisionTimeout)
+		pvcCreatedAndNotDeleted = false
+	})
+})
+
+// waitForPersistentVolumeClaimBeRemoved waits for a PersistentVolumeClaim to be removed from the system until timeout occurs, whichever comes first.
+func waitForPersistentVolumeClaimBeRemoved(c clientset.Interface, ns string, pvcName string, Poll, timeout time.Duration) error {
+	framework.Logf("Waiting up to %v for PersistentVolumeClaim %s to be removed", timeout, pvcName)
+	for start := time.Now(); time.Since(start) < timeout; time.Sleep(Poll) {
+		_, err := c.CoreV1().PersistentVolumeClaims(ns).Get(pvcName, metav1.GetOptions{})
+		if err != nil {
+			if apierrs.IsNotFound(err) {
+				framework.Logf("Claim %q in namespace %q doesn't exist in the system", pvcName, ns)
+				return nil
+			}
+			framework.Logf("Failed to get claim %q in namespace %q, retrying in %v. Error: %v", pvcName, ns, Poll, err)
+		}
+	}
+	return fmt.Errorf("PersistentVolumeClaim %s is not removed from the system within %v", pvcName, timeout)
+}