Fix volume wrapper doesn't have name

Integration test

cmd/integration/integration.go

@@ -55,7 +55,10 @@ import (
 	"k8s.io/kubernetes/pkg/util"
 	"k8s.io/kubernetes/pkg/util/sets"
 	"k8s.io/kubernetes/pkg/util/wait"
+	"k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/empty_dir"
+	"k8s.io/kubernetes/pkg/volume/git_repo"
+	"k8s.io/kubernetes/pkg/volume/secret"
 	"k8s.io/kubernetes/plugin/pkg/scheduler"
 	_ "k8s.io/kubernetes/plugin/pkg/scheduler/algorithmprovider"
 	"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
@@ -211,7 +214,7 @@ func startComponents(firstManifestURL, secondManifestURL string) (string, string
 		10250, /* KubeletPort */
 		0,     /* ReadOnlyPort */
 		api.NamespaceDefault,
-		empty_dir.ProbeVolumePlugins(),
+		probeVolumePlugins(),
 		nil,
 		cadvisorInterface,
 		configFilePath,
@@ -244,7 +247,7 @@ func startComponents(firstManifestURL, secondManifestURL string) (string, string
 		10251, /* KubeletPort */
 		0,     /* ReadOnlyPort */
 		api.NamespaceDefault,
-		empty_dir.ProbeVolumePlugins(),
+		probeVolumePlugins(),
 		nil,
 		cadvisorInterface,
 		"",
@@ -265,6 +268,16 @@ func startComponents(firstManifestURL, secondManifestURL string) (string, string
 	return apiServer.URL, configFilePath
 }
 
+// The list of plugins to probe in this test
+func probeVolumePlugins() []volume.VolumePlugin {
+	allPlugins := []volume.VolumePlugin{}
+
+	allPlugins = append(allPlugins, empty_dir.ProbeVolumePlugins()...)
+	allPlugins = append(allPlugins, git_repo.ProbeVolumePlugins()...)
+	allPlugins = append(allPlugins, secret.ProbeVolumePlugins()...)
+	return allPlugins
+}
+
 func makeTempDirOrDie(prefix string, baseDir string) string {
 	if baseDir == "" {
 		baseDir = "/tmp"
@@ -989,6 +1002,7 @@ func main() {
 		runServiceTest,
 		runAPIVersionsTest,
 		runMasterServiceTest,
+		runWrapperVolumesPluginsTest,
 		func(c *client.Client) {
 			runSelfLinkTestOnNamespace(c, api.NamespaceDefault)
 			runSelfLinkTestOnNamespace(c, "other")
@@ -1038,8 +1052,8 @@ func main() {
 	//              1 pod infra container + 1 container from the service test.
 	// The total number of container created is 9
 
-	if len(createdConts) != 12 {
+	if len(createdConts) != 14 {
-		glog.Fatalf("Expected 12 containers; got %v\n\nlist of created containers:\n\n%#v\n\nDocker 1 Created:\n\n%#v\n\nDocker 2 Created:\n\n%#v\n\n", len(createdConts), createdConts.List(), fakeDocker1.Created, fakeDocker2.Created)
+		glog.Fatalf("Expected 14 containers; got %v\n\nlist of created containers:\n\n%#v\n\nDocker 1 Created:\n\n%#v\n\nDocker 2 Created:\n\n%#v\n\n", len(createdConts), createdConts.List(), fakeDocker1.Created, fakeDocker2.Created)
 	}
 	glog.Infof("OK - found created containers: %#v", createdConts.List())
 
@@ -1097,3 +1111,72 @@ const (
 		}
 	}`
 )
+
+// This is a test to make sure multiple empty_dir wrapper based volumes should not affect each other
+func runWrapperVolumesPluginsTest(client *client.Client) {
+	// Make a secret object.
+	ns := api.NamespaceDefault
+	s := api.Secret{
+		ObjectMeta: api.ObjectMeta{
+			Name:      "secret-name",
+			Namespace: ns,
+		},
+		Data: map[string][]byte{
+			"data": []byte("value1\n"),
+		},
+	}
+
+	if _, err := client.Secrets(s.Namespace).Create(&s); err != nil {
+		glog.Fatalf("unable to create test secret: %v", err)
+	}
+
+	pod := &api.Pod{
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Name:  "vol-container",
+					Image: "kubernetes/pause",
+					VolumeMounts: []api.VolumeMount{
+						{
+							Name:      "vol-secret",
+							MountPath: "/fake/path-1",
+							ReadOnly:  true,
+						},
+						{
+							Name:      "vol-git",
+							MountPath: "/fake/path-2",
+						},
+					},
+				},
+			},
+			Volumes: []api.Volume{
+				{
+					Name: "vol-secret",
+					VolumeSource: api.VolumeSource{
+						Secret: &api.SecretVolumeSource{
+							SecretName: "secret-name",
+						},
+					},
+				},
+				{
+					Name: "vol-git",
+					VolumeSource: api.VolumeSource{
+						GitRepo: &api.GitRepoVolumeSource{
+							Repository: "https://github.com/kubernetes/kubedash",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	pod.ObjectMeta.Name = "wrappedvolumes.foo"
+	foo, err := client.Pods(api.NamespaceDefault).Create(pod)
+	if err != nil {
+		glog.Fatalf("Failed to create pod: %v, %v", pod, err)
+	}
+	if err := wait.Poll(time.Second, longTestTimeout, podRunning(client, foo.Namespace, foo.Name)); err != nil {
+		glog.Fatalf("FAILED: pod never started running %v", err)
+	}
+	glog.Info("empty_dir wrapper based volumes doesn't affect each other: test passed.")
+}

pkg/volume/downwardapi/downwardapi.go

@@ -70,6 +70,7 @@ func (plugin *downwardAPIPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opt
 		pod:               pod,
 		podUID:            pod.UID,
 		plugin:            plugin,
+		wrappedVolumeSpec: volume.GetWrappedVolumeSpec(spec.Name(), downwardAPIPluginName),
 	}
 	v.fieldReferenceFileNames = make(map[string]string)
 	for _, fileInfo := range spec.Volume.DownwardAPI.Items {
@@ -81,7 +82,12 @@ func (plugin *downwardAPIPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opt
 }
 
 func (plugin *downwardAPIPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
-	return &downwardAPIVolumeCleaner{&downwardAPIVolume{volName: volName, podUID: podUID, plugin: plugin}}, nil
+	return &downwardAPIVolumeCleaner{&downwardAPIVolume{
+		volName:           volName,
+		podUID:            podUID,
+		plugin:            plugin,
+		wrappedVolumeSpec: volume.GetWrappedVolumeSpec(volName, downwardAPIPluginName)},
+	}, nil
 }
 
 // downwardAPIVolume retrieves downward API data and placing them into the volume on the host.
@@ -92,11 +98,7 @@ type downwardAPIVolume struct {
 	podUID                  types.UID // TODO: remove this redundancy as soon NewCleaner func will have *api.POD and not only types.UID
 	plugin                  *downwardAPIPlugin
 	volume.MetricsNil
-}
+	wrappedVolumeSpec *volume.Spec
-
-// This is the spec for the volume that this plugin wraps.
-var wrappedVolumeSpec = &volume.Spec{
-	Volume: &api.Volume{VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{Medium: api.StorageMediumMemory}}},
 }
 
 // downwardAPIVolumeBuilder fetches info from downward API from the pod
@@ -130,7 +132,7 @@ func (b *downwardAPIVolumeBuilder) SetUp() error {
 func (b *downwardAPIVolumeBuilder) SetUpAt(dir string) error {
 	glog.V(3).Infof("Setting up a downwardAPI volume %v for pod %v/%v at %v", b.volName, b.pod.Namespace, b.pod.Name, dir)
 	// Wrap EmptyDir. Here we rely on the idempotency of the wrapped plugin to avoid repeatedly mounting
-	wrapped, err := b.plugin.host.NewWrapperBuilder(wrappedVolumeSpec, b.pod, *b.opts)
+	wrapped, err := b.plugin.host.NewWrapperBuilder(b.wrappedVolumeSpec, b.pod, *b.opts)
 	if err != nil {
 		glog.Errorf("Couldn't setup downwardAPI volume %v for pod %v/%v: %s", b.volName, b.pod.Namespace, b.pod.Name, err.Error())
 		return err
@@ -364,7 +366,7 @@ func (c *downwardAPIVolumeCleaner) TearDownAt(dir string) error {
 	glog.V(3).Infof("Tearing down volume %v for pod %v at %v", c.volName, c.podUID, dir)
 
 	// Wrap EmptyDir, let it do the teardown.
-	wrapped, err := c.plugin.host.NewWrapperCleaner(wrappedVolumeSpec, c.podUID)
+	wrapped, err := c.plugin.host.NewWrapperCleaner(c.wrappedVolumeSpec, c.podUID)
 	if err != nil {
 		return err
 	}

pkg/volume/downwardapi/downwardapi_test.go

@@ -39,12 +39,12 @@ func formatMap(m map[string]string) (fmtstr string) {
 	return
 }
 
-func newTestHost(t *testing.T, client client.Interface, basePath string) volume.VolumeHost {
+func newTestHost(t *testing.T, client client.Interface, basePath string) (string, volume.VolumeHost) {
 	tempDir, err := ioutil.TempDir(basePath, "downwardApi_volume_test.")
 	if err != nil {
 		t.Fatalf("can't make a temp rootdir: %v", err)
 	}
-	return volume.NewFakeVolumeHost(tempDir, client, empty_dir.ProbeVolumePlugins())
+	return tempDir, volume.NewFakeVolumeHost(tempDir, client, empty_dir.ProbeVolumePlugins())
 }
 
 func TestCanSupport(t *testing.T) {
@@ -54,7 +54,8 @@ func TestCanSupport(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, nil, tmpDir))
+	_, host := newTestHost(t, nil, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	if err != nil {
@@ -110,7 +111,8 @@ func TestLabels(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	rootDir, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	volumeSpec := &api.Volume{
 		Name: testVolumeName,
@@ -141,6 +143,17 @@ func TestLabels(t *testing.T) {
 		t.Errorf("Failed to setup volume: %v", err)
 	}
 
+	// gitRepo volume should create it's own empty wrapper path
+	podWrapperMetadataDir := fmt.Sprintf("%v/pods/%v/plugins/kubernetes.io~empty-dir/wrapped_%v", rootDir, testPodUID, testVolumeName)
+
+	if _, err := os.Stat(podWrapperMetadataDir); err != nil {
+		if os.IsNotExist(err) {
+			t.Errorf("SetUp() failed, empty-dir wrapper path was not created: %s", podWrapperMetadataDir)
+		} else {
+			t.Errorf("SetUp() failed: %v", err)
+		}
+	}
+
 	var data []byte
 	data, err = ioutil.ReadFile(path.Join(volumePath, "labels"))
 	if err != nil {
@@ -189,7 +202,8 @@ func TestAnnotations(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	if err != nil {
 		t.Errorf("Can't find the plugin by name")
@@ -254,7 +268,8 @@ func TestName(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	if err != nil {
 		t.Errorf("Can't find the plugin by name")
@@ -320,7 +335,8 @@ func TestNamespace(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	if err != nil {
 		t.Errorf("Can't find the plugin by name")
@@ -379,7 +395,8 @@ func TestWriteTwiceNoUpdate(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	volumeSpec := &api.Volume{
 		Name: testVolumeName,
@@ -468,7 +485,8 @@ func TestWriteTwiceWithUpdate(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	volumeSpec := &api.Volume{
 		Name: testVolumeName,
@@ -577,7 +595,8 @@ func TestWriteWithUnixPath(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	volumeSpec := &api.Volume{
 		Name: testVolumeName,
@@ -656,7 +675,8 @@ func TestWriteWithUnixPathBadPath(t *testing.T) {
 	}
 	defer os.RemoveAll(tmpDir)
 	pluginMgr := volume.VolumePluginMgr{}
-	pluginMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t, fake, tmpDir))
+	_, host := newTestHost(t, fake, tmpDir)
+	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
 	plugin, err := pluginMgr.FindPluginByName(downwardAPIPluginName)
 	if err != nil {
 		t.Errorf("Can't find the plugin by name")

pkg/volume/git_repo/git_repo.go

@@ -64,6 +64,7 @@ func (plugin *gitRepoPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opts vo
 			volName:           spec.Name(),
 			podUID:            pod.UID,
 			plugin:            plugin,
+			wrappedVolumeSpec: volume.GetWrappedVolumeSpec(spec.Name(), gitRepoPluginName),
 		},
 		pod:      *pod,
 		source:   spec.Volume.GitRepo.Repository,
@@ -80,6 +81,7 @@ func (plugin *gitRepoPlugin) NewCleaner(volName string, podUID types.UID) (volum
 			volName:           volName,
 			podUID:            podUID,
 			plugin:            plugin,
+			wrappedVolumeSpec: volume.GetWrappedVolumeSpec(volName, gitRepoPluginName),
 		},
 	}, nil
 }
@@ -90,6 +92,7 @@ type gitRepoVolume struct {
 	volName           string
 	podUID            types.UID
 	plugin            *gitRepoPlugin
+	wrappedVolumeSpec *volume.Spec
 	volume.MetricsNil
 }
 
@@ -128,11 +131,6 @@ func (b *gitRepoVolumeBuilder) SetUp() error {
 	return b.SetUpAt(b.GetPath())
 }
 
-// This is the spec for the volume that this plugin wraps.
-var wrappedVolumeSpec = &volume.Spec{
-	Volume: &api.Volume{VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}},
-}
-
 // SetUpAt creates new directory and clones a git repo.
 func (b *gitRepoVolumeBuilder) SetUpAt(dir string) error {
 	if volumeutil.IsReady(b.getMetaDir()) {
@@ -140,7 +138,7 @@ func (b *gitRepoVolumeBuilder) SetUpAt(dir string) error {
 	}
 
 	// Wrap EmptyDir, let it do the setup.
-	wrapped, err := b.plugin.host.NewWrapperBuilder(wrappedVolumeSpec, &b.pod, b.opts)
+	wrapped, err := b.plugin.host.NewWrapperBuilder(b.wrappedVolumeSpec, &b.pod, b.opts)
 	if err != nil {
 		return err
 	}
@@ -218,8 +216,9 @@ func (c *gitRepoVolumeCleaner) TearDown() error {
 
 // TearDownAt simply deletes everything in the directory.
 func (c *gitRepoVolumeCleaner) TearDownAt(dir string) error {
+
 	// Wrap EmptyDir, let it do the teardown.
-	wrapped, err := c.plugin.host.NewWrapperCleaner(wrappedVolumeSpec, c.podUID)
+	wrapped, err := c.plugin.host.NewWrapperCleaner(c.wrappedVolumeSpec, c.podUID)
 	if err != nil {
 		return err
 	}

pkg/volume/git_repo/git_repo_test.go

@@ -32,17 +32,18 @@ import (
 	"k8s.io/kubernetes/pkg/volume/empty_dir"
 )
 
-func newTestHost(t *testing.T) volume.VolumeHost {
+func newTestHost(t *testing.T) (string, volume.VolumeHost) {
 	tempDir, err := ioutil.TempDir("/tmp", "git_repo_test.")
 	if err != nil {
 		t.Fatalf("can't make a temp rootdir: %v", err)
 	}
-	return volume.NewFakeVolumeHost(tempDir, nil, empty_dir.ProbeVolumePlugins())
+	return tempDir, volume.NewFakeVolumeHost(tempDir, nil, empty_dir.ProbeVolumePlugins())
 }
 
 func TestCanSupport(t *testing.T) {
 	plugMgr := volume.VolumePluginMgr{}
-	plugMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t))
+	_, host := newTestHost(t)
+	plugMgr.InitPlugins(ProbeVolumePlugins(), host)
 
 	plug, err := plugMgr.FindPluginByName("kubernetes.io/git-repo")
 	if err != nil {
@@ -218,7 +219,8 @@ func doTestPlugin(scenario struct {
 	allErrs := []error{}
 
 	plugMgr := volume.VolumePluginMgr{}
-	plugMgr.InitPlugins(ProbeVolumePlugins(), newTestHost(t))
+	rootDir, host := newTestHost(t)
+	plugMgr.InitPlugins(ProbeVolumePlugins(), host)
 
 	plug, err := plugMgr.FindPluginByName("kubernetes.io/git-repo")
 	if err != nil {
@@ -241,7 +243,8 @@ func doTestPlugin(scenario struct {
 	}
 
 	path := builder.GetPath()
-	if !strings.HasSuffix(path, "pods/poduid/volumes/kubernetes.io~git-repo/vol1") {
+	suffix := fmt.Sprintf("pods/poduid/volumes/kubernetes.io~git-repo/%v", scenario.vol.Name)
+	if !strings.HasSuffix(path, suffix) {
 		allErrs = append(allErrs,
 			fmt.Errorf("Got unexpected path: %s", path))
 		return allErrs
@@ -263,6 +266,19 @@ func doTestPlugin(scenario struct {
 		}
 	}
 
+	// gitRepo volume should create it's own empty wrapper path
+	podWrapperMetadataDir := fmt.Sprintf("%v/pods/poduid/plugins/kubernetes.io~empty-dir/wrapped_%v", rootDir, scenario.vol.Name)
+
+	if _, err := os.Stat(podWrapperMetadataDir); err != nil {
+		if os.IsNotExist(err) {
+			allErrs = append(allErrs,
+				fmt.Errorf("SetUp() failed, empty-dir wrapper path is not created: %s", podWrapperMetadataDir))
+		} else {
+			allErrs = append(allErrs,
+				fmt.Errorf("SetUp() failed: %v", err))
+		}
+	}
+
 	cleaner, err := plug.NewCleaner("vol1", types.UID("poduid"))
 	if err != nil {
 		allErrs = append(allErrs,

pkg/volume/secret/secret.go

@@ -62,14 +62,33 @@ func (plugin *secretPlugin) CanSupport(spec *volume.Spec) bool {
 
 func (plugin *secretPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opts volume.VolumeOptions) (volume.Builder, error) {
 	return &secretVolumeBuilder{
-		secretVolume: &secretVolume{spec.Name(), pod.UID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}},
+		secretVolume: &secretVolume{
+			spec.Name(),
+			pod.UID,
+			plugin,
+			plugin.host.GetMounter(),
+			plugin.host.GetWriter(),
+			volume.MetricsNil{},
+			volume.GetWrappedVolumeSpec(spec.Name(), secretPluginName),
+		},
 		secretName: spec.Volume.Secret.SecretName,
 		pod:        *pod,
-		opts:         &opts}, nil
+		opts:       &opts,
+	}, nil
 }
 
 func (plugin *secretPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
-	return &secretVolumeCleaner{&secretVolume{volName, podUID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}}}, nil
+	return &secretVolumeCleaner{
+		&secretVolume{
+			volName,
+			podUID,
+			plugin,
+			plugin.host.GetMounter(),
+			plugin.host.GetWriter(),
+			volume.MetricsNil{},
+			volume.GetWrappedVolumeSpec(volName, secretPluginName),
+		},
+	}, nil
 }
 
 type secretVolume struct {
@@ -79,6 +98,7 @@ type secretVolume struct {
 	mounter mount.Interface
 	writer  ioutil.Writer
 	volume.MetricsNil
+	wrappedVolumeSpec *volume.Spec
 }
 
 var _ volume.Volume = &secretVolume{}
@@ -111,11 +131,6 @@ func (b *secretVolumeBuilder) SetUp() error {
 	return b.SetUpAt(b.GetPath())
 }
 
-// This is the spec for the volume that this plugin wraps.
-var wrappedVolumeSpec = &volume.Spec{
-	Volume: &api.Volume{VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{Medium: api.StorageMediumMemory}}},
-}
-
 func (b *secretVolumeBuilder) getMetaDir() string {
 	return path.Join(b.plugin.host.GetPodPluginDir(b.podUID, util.EscapeQualifiedNameForDisk(secretPluginName)), b.volName)
 }
@@ -137,7 +152,7 @@ func (b *secretVolumeBuilder) SetUpAt(dir string) error {
 	glog.V(3).Infof("Setting up volume %v for pod %v at %v", b.volName, b.pod.UID, dir)
 
 	// Wrap EmptyDir, let it do the setup.
-	wrapped, err := b.plugin.host.NewWrapperBuilder(wrappedVolumeSpec, &b.pod, *b.opts)
+	wrapped, err := b.plugin.host.NewWrapperBuilder(b.wrappedVolumeSpec, &b.pod, *b.opts)
 	if err != nil {
 		return err
 	}
@@ -202,7 +217,7 @@ func (c *secretVolumeCleaner) TearDownAt(dir string) error {
 	glog.V(3).Infof("Tearing down volume %v for pod %v at %v", c.volName, c.podUID, dir)
 
 	// Wrap EmptyDir, let it do the teardown.
-	wrapped, err := c.plugin.host.NewWrapperCleaner(wrappedVolumeSpec, c.podUID)
+	wrapped, err := c.plugin.host.NewWrapperCleaner(c.wrappedVolumeSpec, c.podUID)
 	if err != nil {
 		return err
 	}

pkg/volume/secret/secret_test.go

@@ -74,7 +74,7 @@ func TestPlugin(t *testing.T) {
 		secret        = secret(testNamespace, testName)
 		client        = testclient.NewSimpleFake(&secret)
 		pluginMgr     = volume.VolumePluginMgr{}
-		_, host    = newTestHost(t, client)
+		rootDir, host = newTestHost(t, client)
 	)
 
 	pluginMgr.InitPlugins(ProbeVolumePlugins(), host)
@@ -110,6 +110,16 @@ func TestPlugin(t *testing.T) {
 		}
 	}
 
+	// secret volume should create it's own empty wrapper path
+	podWrapperMetadataDir := fmt.Sprintf("%v/pods/test_pod_uid/plugins/kubernetes.io~empty-dir/wrapped_test_volume_name", rootDir)
+
+	if _, err := os.Stat(podWrapperMetadataDir); err != nil {
+		if os.IsNotExist(err) {
+			t.Errorf("SetUp() failed, empty-dir wrapper path is not created: %s", podWrapperMetadataDir)
+		} else {
+			t.Errorf("SetUp() failed: %v", err)
+		}
+	}
 	doTestSecretDataInVolume(volumePath, secret, t)
 	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
 }

pkg/volume/volume.go

@@ -17,6 +17,7 @@ limitations under the License.
 package volume
 
 import (
+	"fmt"
 	"io/ioutil"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/resource"
@@ -24,6 +25,10 @@ import (
 	"path"
 )
 
+const (
+	randomLength = 5
+)
+
 // Volume represents a directory used by pods or hosts on a node.
 // All method implementations of methods in the volume interface must be idempotent.
 type Volume interface {
@@ -132,3 +137,22 @@ func RenameDirectory(oldPath, newName string) (string, error) {
 	}
 	return newPath, nil
 }
+
+// Return the wrapper volume spec of specific volume plugin
+func GetWrappedVolumeSpec(volName string, pluginName string) *Spec {
+	// The name of wrapper volume is set to "wrapped_{wrapped_volume_name}"
+	wrapperVolumeName := fmt.Sprintf("wrapped_%v", volName)
+
+	var volumeSpec *Spec
+	switch pluginName {
+	case "kubernetes.io/downward-api", "kubernetes.io/secret":
+		volumeSpec = &Spec{
+			Volume: &api.Volume{Name: wrapperVolumeName, VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{Medium: api.StorageMediumMemory}}},
+		}
+	case "kubernetes.io/git-repo":
+		volumeSpec = &Spec{
+			Volume: &api.Volume{Name: wrapperVolumeName, VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}},
+		}
+	}
+	return volumeSpec
+}