convert EndpointNamespace showing string rather than pointer

Signed-off-by: Zou Nengren <zouyee1989@gmail.com>

staging/src/k8s.io/kubectl/pkg/describe/versioned/describe.go

@@ -997,12 +997,16 @@ func printGlusterfsVolumeSource(glusterfs *corev1.GlusterfsVolumeSource, w Prefi
 }
 
 func printGlusterfsPersistentVolumeSource(glusterfs *corev1.GlusterfsPersistentVolumeSource, w PrefixWriter) {
+	endpointsNamespace := "<unset>"
+	if glusterfs.EndpointsNamespace != nil {
+		endpointsNamespace = *glusterfs.EndpointsNamespace
+	}
 	w.Write(LEVEL_2, "Type:\tGlusterfs (a Glusterfs mount on the host that shares a pod's lifetime)\n"+
 		"    EndpointsName:\t%v\n"+
 		"    EndpointsNamespace:\t%v\n"+
 		"    Path:\t%v\n"+
 		"    ReadOnly:\t%v\n",
-		glusterfs.EndpointsName, glusterfs.EndpointsNamespace, glusterfs.Path, glusterfs.ReadOnly)
+		glusterfs.EndpointsName, endpointsNamespace, glusterfs.Path, glusterfs.ReadOnly)
 }
 
 func printPersistentVolumeClaimVolumeSource(claim *corev1.PersistentVolumeClaimVolumeSource, w PrefixWriter) {

staging/src/k8s.io/kubectl/pkg/describe/versioned/describe_test.go

@@ -937,6 +937,7 @@ func TestGetPodsTotalRequests(t *testing.T) {
 func TestPersistentVolumeDescriber(t *testing.T) {
 	block := corev1.PersistentVolumeBlock
 	file := corev1.PersistentVolumeFilesystem
+	foo := "glusterfsendpointname"
 	deletionTimestamp := metav1.Time{Time: time.Now().UTC().AddDate(-10, 0, 0)}
 	testCases := []struct {
 		name               string
@@ -1023,6 +1024,7 @@ func TestPersistentVolumeDescriber(t *testing.T) {
 					},
 				},
 			},
+			expectedElements:   []string{"EndpointsNamespace", "<unset>"},
 			unexpectedElements: []string{"VolumeMode", "Filesystem"},
 		},
 		{
@@ -1273,6 +1275,22 @@ func TestPersistentVolumeDescriber(t *testing.T) {
 			},
 			expectedElements: []string{"Driver", "VolumeHandle", "ReadOnly", "VolumeAttributes"},
 		},
+		{
+			name:   "test19",
+			plugin: "gluster",
+			pv: &corev1.PersistentVolume{
+				ObjectMeta: metav1.ObjectMeta{Name: "bar"},
+				Spec: corev1.PersistentVolumeSpec{
+					PersistentVolumeSource: corev1.PersistentVolumeSource{
+						Glusterfs: &corev1.GlusterfsPersistentVolumeSource{
+							EndpointsNamespace: &foo,
+						},
+					},
+				},
+			},
+			expectedElements:   []string{"EndpointsNamespace", "glusterfsendpointname"},
+			unexpectedElements: []string{"VolumeMode", "Filesystem"},
+		},
 	}
 
 	for _, test := range testCases {