Add image volume subpath e2e tests

Adding new test cases for subpath handling for image volumes.

Signed-off-by: Sascha Grunert <[email protected]>

Author: saschagrunert

test/e2e_node/image_volume.go

@@ -30,6 +30,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/kubelet/images"
+	"k8s.io/kubernetes/pkg/kubelet/kuberuntime"
 	"k8s.io/kubernetes/test/e2e/feature"
 	"k8s.io/kubernetes/test/e2e/framework"
 	e2enode "k8s.io/kubernetes/test/e2e/framework/node"
@@ -89,7 +90,6 @@ var _ = SIGDescribe("ImageVolume", feature.ImageVolume, func() {
 
 		ginkgo.By(fmt.Sprintf("Creating a pod (%s/%s)", f.Namespace.Name, podName))
 		e2epod.NewPodClient(f).Create(ctx, pod)
-
 	}
 
 	verifyFileContents := func(podName, volumePath string) {
@@ -100,7 +100,6 @@ var _ = SIGDescribe("ImageVolume", feature.ImageVolume, func() {
 
 		secondFileContents := e2epod.ExecCommandInContainer(f, podName, containerName, "/bin/cat", filepath.Join(volumePath, "etc", "os-release"))
 		gomega.Expect(secondFileContents).To(gomega.ContainSubstring("Alpine Linux"))
-
 	}
 
 	f.It("should succeed with pod and pull policy of Always", func(ctx context.Context) {
@@ -188,7 +187,7 @@ var _ = SIGDescribe("ImageVolume", feature.ImageVolume, func() {
 
 		ginkgo.By(fmt.Sprintf("Waiting for the pod (%s/%s) to fail", f.Namespace.Name, podName))
 		err := e2epod.WaitForPodContainerToFail(ctx, f.ClientSet, f.Namespace.Name, podName, 0, images.ErrImagePullBackOff.Error(), time.Minute)
-		framework.ExpectNoError(err, "Failed to await for the pod to be running: (%s/%s)", f.Namespace.Name, podName)
+		framework.ExpectNoError(err, "Failed to await for the pod to be failed: (%s/%s)", f.Namespace.Name, podName)
 	})
 
 	f.It("should succeed if image volume is not existing but unused", func(ctx context.Context) {
@@ -274,4 +273,72 @@ var _ = SIGDescribe("ImageVolume", feature.ImageVolume, func() {
 
 		verifyFileContents(podName, volumePathPrefix)
 	})
+
+	f.Context("subPath", func() {
+		ginkgo.BeforeEach(func(ctx context.Context) {
+			runtime, _, err := getCRIClient()
+			framework.ExpectNoError(err, "Failed to get CRI client")
+
+			version, err := runtime.Version(context.Background(), "")
+			framework.ExpectNoError(err, "Failed to get runtime version")
+
+			// TODO: enable the subpath tests if containerd main branch has support for it.
+			if version.GetRuntimeName() != "cri-o" {
+				e2eskipper.Skip("runtime is not CRI-O")
+			}
+		})
+
+		f.It("should succeed when using a valid subPath", func(ctx context.Context) {
+			var selinuxOptions *v1.SELinuxOptions
+			if selinux.GetEnabled() {
+				selinuxOptions = &v1.SELinuxOptions{
+					User:  defaultSELinuxUser,
+					Role:  defaultSELinuxRole,
+					Type:  defaultSELinuxType,
+					Level: defaultSELinuxLevel,
+				}
+				ginkgo.By(fmt.Sprintf("Using SELinux on pod: %v", selinuxOptions))
+			}
+
+			createPod(ctx,
+				podName,
+				"",
+				[]v1.Volume{{Name: volumeName, VolumeSource: v1.VolumeSource{Image: &v1.ImageVolumeSource{Reference: volumeImage}}}},
+				[]v1.VolumeMount{{Name: volumeName, MountPath: volumePathPrefix, SubPath: "etc"}},
+				selinuxOptions,
+			)
+
+			ginkgo.By(fmt.Sprintf("Waiting for the pod (%s/%s) to be running", f.Namespace.Name, podName))
+			err := e2epod.WaitForPodNameRunningInNamespace(ctx, f.ClientSet, podName, f.Namespace.Name)
+			framework.ExpectNoError(err, "Failed to await for the pod to be running: (%s/%s)", f.Namespace.Name, podName)
+
+			fileContent := e2epod.ExecCommandInContainer(f, podName, containerName, "/bin/cat", filepath.Join(volumePathPrefix, "os-release"))
+			gomega.Expect(fileContent).To(gomega.ContainSubstring("Alpine Linux"))
+		})
+
+		f.It("should fail if subPath in volume is not existing", func(ctx context.Context) {
+			var selinuxOptions *v1.SELinuxOptions
+			if selinux.GetEnabled() {
+				selinuxOptions = &v1.SELinuxOptions{
+					User:  defaultSELinuxUser,
+					Role:  defaultSELinuxRole,
+					Type:  defaultSELinuxType,
+					Level: defaultSELinuxLevel,
+				}
+				ginkgo.By(fmt.Sprintf("Using SELinux on pod: %v", selinuxOptions))
+			}
+
+			createPod(ctx,
+				podName,
+				"",
+				[]v1.Volume{{Name: volumeName, VolumeSource: v1.VolumeSource{Image: &v1.ImageVolumeSource{Reference: volumeImage}}}},
+				[]v1.VolumeMount{{Name: volumeName, MountPath: volumePathPrefix, SubPath: "not-existing"}},
+				selinuxOptions,
+			)
+
+			ginkgo.By(fmt.Sprintf("Waiting for the pod (%s/%s) to fail", f.Namespace.Name, podName))
+			err := e2epod.WaitForPodContainerToFail(ctx, f.ClientSet, f.Namespace.Name, podName, 0, kuberuntime.ErrCreateContainer.Error(), time.Minute)
+			framework.ExpectNoError(err, "Failed to await for the pod to be failed: (%s/%s)", f.Namespace.Name, podName)
+		})
+	})
 })