Add basic install and mount flexvolumes e2e tests

cluster/gce/config-test.sh

@@ -152,6 +152,16 @@ CONTROLLER_MANAGER_TEST_LOG_LEVEL="${CONTROLLER_MANAGER_TEST_LOG_LEVEL:-$TEST_CL
 SCHEDULER_TEST_LOG_LEVEL="${SCHEDULER_TEST_LOG_LEVEL:-$TEST_CLUSTER_LOG_LEVEL}"
 KUBEPROXY_TEST_LOG_LEVEL="${KUBEPROXY_TEST_LOG_LEVEL:-$TEST_CLUSTER_LOG_LEVEL}"
 
+# TODO: change this and flex e2e test when default flex volume install path is changed for GCI
+# Set flex dir to one that's readable from controller-manager container and writable by the flex e2e test.
+if [[ "${MASTER_OS_DISTRIBUTION}" == "gci" ]]; then
+    CONTROLLER_MANAGER_TEST_VOLUME_PLUGIN_DIR="--flex-volume-plugin-dir=/etc/srv/kubernetes/kubelet-plugins/volume/exec"
+fi
+# Set flex dir to one that's readable from kubelet and writable by the flex e2e test.
+if [[ "${NODE_OS_DISTRIBUTION}" == "gci" ]] || ([[ "${MASTER_OS_DISTRIBUTION}" == "gci" ]] && [[ "${REGISTER_MASTER_KUBELET}" == "false" ]]); then
+    KUBELET_TEST_VOLUME_PLUGIN_DIR="--volume-plugin-dir=/etc/srv/kubernetes/kubelet-plugins/volume/exec"
+fi
+
 TEST_CLUSTER_DELETE_COLLECTION_WORKERS="${TEST_CLUSTER_DELETE_COLLECTION_WORKERS:---delete-collection-workers=1}"
 TEST_CLUSTER_MAX_REQUESTS_INFLIGHT="${TEST_CLUSTER_MAX_REQUESTS_INFLIGHT:-}"
 TEST_CLUSTER_RESYNC_PERIOD="${TEST_CLUSTER_RESYNC_PERIOD:---min-resync-period=3m}"
@@ -159,7 +169,7 @@ TEST_CLUSTER_RESYNC_PERIOD="${TEST_CLUSTER_RESYNC_PERIOD:---min-resync-period=3m
 # ContentType used by all components to communicate with apiserver.
 TEST_CLUSTER_API_CONTENT_TYPE="${TEST_CLUSTER_API_CONTENT_TYPE:-}"
 
-KUBELET_TEST_ARGS="${KUBELET_TEST_ARGS:-} --max-pods=110 --serialize-image-pulls=false ${TEST_CLUSTER_API_CONTENT_TYPE}"
+KUBELET_TEST_ARGS="${KUBELET_TEST_ARGS:-} --max-pods=110 --serialize-image-pulls=false ${TEST_CLUSTER_API_CONTENT_TYPE} ${KUBELET_TEST_VOLUME_PLUGIN_DIR:-}"
 if [[ "${NODE_OS_DISTRIBUTION}" == "gci" ]] || [[ "${NODE_OS_DISTRIBUTION}" == "ubuntu" ]]; then
   NODE_KUBELET_TEST_ARGS=" --experimental-kernel-memcg-notification=true"
 fi
@@ -167,7 +177,7 @@ if [[ "${MASTER_OS_DISTRIBUTION}" == "gci" ]] || [[ "${MASTER_OS_DISTRIBUTION}"
   MASTER_KUBELET_TEST_ARGS=" --experimental-kernel-memcg-notification=true"
 fi
 APISERVER_TEST_ARGS="${APISERVER_TEST_ARGS:-} --runtime-config=extensions/v1beta1 ${TEST_CLUSTER_DELETE_COLLECTION_WORKERS} ${TEST_CLUSTER_MAX_REQUESTS_INFLIGHT}"
-CONTROLLER_MANAGER_TEST_ARGS="${CONTROLLER_MANAGER_TEST_ARGS:-} ${TEST_CLUSTER_RESYNC_PERIOD} ${TEST_CLUSTER_API_CONTENT_TYPE}"
+CONTROLLER_MANAGER_TEST_ARGS="${CONTROLLER_MANAGER_TEST_ARGS:-} ${TEST_CLUSTER_RESYNC_PERIOD} ${TEST_CLUSTER_API_CONTENT_TYPE} ${CONTROLLER_MANAGER_TEST_VOLUME_PLUGIN_DIR:-}"
 SCHEDULER_TEST_ARGS="${SCHEDULER_TEST_ARGS:-} ${TEST_CLUSTER_API_CONTENT_TYPE}"
 KUBEPROXY_TEST_ARGS="${KUBEPROXY_TEST_ARGS:-} ${TEST_CLUSTER_API_CONTENT_TYPE}"
 

test/e2e/framework/util.go

@@ -342,6 +342,12 @@ func SkipUnlessProviderIs(supportedProviders ...string) {
 	}
 }
 
+func SkipUnlessMasterOSDistroIs(supportedMasterOsDistros ...string) {
+	if !MasterOSDistroIs(supportedMasterOsDistros...) {
+		Skipf("Only supported for master OS distro %v (not %s)", supportedMasterOsDistros, TestContext.MasterOSDistro)
+	}
+}
+
 func SkipUnlessNodeOSDistroIs(supportedNodeOsDistros ...string) {
 	if !NodeOSDistroIs(supportedNodeOsDistros...) {
 		Skipf("Only supported for node OS distro %v (not %s)", supportedNodeOsDistros, TestContext.NodeOSDistro)
@@ -383,6 +389,15 @@ func ProviderIs(providers ...string) bool {
 	return false
 }
 
+func MasterOSDistroIs(supportedMasterOsDistros ...string) bool {
+	for _, distro := range supportedMasterOsDistros {
+		if strings.ToLower(distro) == strings.ToLower(TestContext.MasterOSDistro) {
+			return true
+		}
+	}
+	return false
+}
+
 func NodeOSDistroIs(supportedNodeOsDistros ...string) bool {
 	for _, distro := range supportedNodeOsDistros {
 		if strings.ToLower(distro) == strings.ToLower(TestContext.NodeOSDistro) {
@@ -3758,6 +3773,43 @@ func RestartKubeProxy(host string) error {
 	return nil
 }
 
+func RestartKubelet(host string) error {
+	// TODO: Make it work for all providers and distros.
+	if !ProviderIs("gce", "aws") {
+		return fmt.Errorf("unsupported provider: %s", TestContext.Provider)
+	}
+	if ProviderIs("gce") && !NodeOSDistroIs("debian", "gci") {
+		return fmt.Errorf("unsupported node OS distro: %s", TestContext.NodeOSDistro)
+	}
+	var cmd string
+	if ProviderIs("gce") && NodeOSDistroIs("debian") {
+		cmd = "sudo /etc/init.d/kubelet restart"
+	} else {
+		cmd = "sudo systemctl restart kubelet"
+	}
+	Logf("Restarting kubelet via ssh, running: %v", cmd)
+	result, err := SSH(cmd, host, TestContext.Provider)
+	if err != nil || result.Code != 0 {
+		LogSSHResult(result)
+		return fmt.Errorf("couldn't restart kubelet: %v", err)
+	}
+	return nil
+}
+
+func WaitForKubeletUp(host string) error {
+	cmd := "curl http://localhost:" + strconv.Itoa(ports.KubeletReadOnlyPort) + "/healthz"
+	for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5 * time.Second) {
+		result, err := SSH(cmd, host, TestContext.Provider)
+		if err != nil || result.Code != 0 {
+			LogSSHResult(result)
+		}
+		if result.Stdout == "ok" {
+			return nil
+		}
+	}
+	return fmt.Errorf("waiting for kubelet timed out")
+}
+
 func RestartApiserver(c discovery.ServerVersionInterface) error {
 	// TODO: Make it work for all providers.
 	if !ProviderIs("gce", "gke", "aws") {
@@ -3806,6 +3858,38 @@ func WaitForApiserverUp(c clientset.Interface) error {
 	return fmt.Errorf("waiting for apiserver timed out")
 }
 
+func RestartControllerManager() error {
+	// TODO: Make it work for all providers and distros.
+	if !ProviderIs("gce", "aws") {
+		return fmt.Errorf("unsupported provider: %s", TestContext.Provider)
+	}
+	if ProviderIs("gce") && !MasterOSDistroIs("gci") {
+		return fmt.Errorf("unsupported master OS distro: %s", TestContext.MasterOSDistro)
+	}
+	cmd := "sudo docker ps | grep k8s_kube-controller-manager | cut -d ' ' -f 1 | xargs sudo docker kill"
+	Logf("Restarting controller-manager via ssh, running: %v", cmd)
+	result, err := SSH(cmd, GetMasterHost()+":22", TestContext.Provider)
+	if err != nil || result.Code != 0 {
+		LogSSHResult(result)
+		return fmt.Errorf("couldn't restart controller-manager: %v", err)
+	}
+	return nil
+}
+
+func WaitForControllerManagerUp() error {
+	cmd := "curl http://localhost:" + strconv.Itoa(ports.ControllerManagerPort) + "/healthz"
+	for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5 * time.Second) {
+		result, err := SSH(cmd, GetMasterHost()+":22", TestContext.Provider)
+		if err != nil || result.Code != 0 {
+			LogSSHResult(result)
+		}
+		if result.Stdout == "ok" {
+			return nil
+		}
+	}
+	return fmt.Errorf("waiting for controller-manager timed out")
+}
+
 // WaitForClusterSize waits until the cluster has desired size and there is no not-ready nodes in it.
 // By cluster size we mean number of Nodes excluding Master Node.
 func WaitForClusterSize(c clientset.Interface, size int, timeout time.Duration) error {

test/e2e/framework/volume_util.go

@@ -96,8 +96,10 @@ type VolumeTestConfig struct {
 	// Wait for the pod to terminate successfully
 	// False indicates that the pod is long running
 	WaitForCompletion bool
-	// NodeName to run pod on.  Default is any node.
+	// ServerNodeName is the spec.nodeName to run server pod on.  Default is any node.
-	NodeName string
+	ServerNodeName string
+	// ClientNodeName is the spec.nodeName to run client pod on.  Default is any node.
+	ClientNodeName string
 }
 
 // VolumeTest contains a volume to mount into a client pod and its
@@ -283,7 +285,7 @@ func StartVolumeServer(client clientset.Interface, config VolumeTestConfig) *v1.
 			},
 			Volumes:       volumes,
 			RestartPolicy: restartPolicy,
-			NodeName:      config.NodeName,
+			NodeName:      config.ServerNodeName,
 		},
 	}
 
@@ -389,6 +391,7 @@ func TestVolumeClient(client clientset.Interface, config VolumeTestConfig, fsGro
 				},
 			},
 			Volumes:  []v1.Volume{},
+			NodeName: config.ClientNodeName,
 		},
 	}
 	podsNamespacer := client.CoreV1().Pods(config.Namespace)

test/e2e/storage/BUILD

@@ -11,6 +11,7 @@ go_library(
     name = "go_default_library",
     srcs = [
         "empty_dir_wrapper.go",
+        "flexvolume.go",
         "framework.go",
         "pd.go",
         "persistent_volumes.go",
@@ -39,6 +40,7 @@ go_library(
         "//pkg/kubelet/apis:go_default_library",
         "//pkg/volume/util/volumehelper:go_default_library",
         "//test/e2e/framework:go_default_library",
+        "//test/e2e/generated:go_default_library",
         "//vendor/github.com/aws/aws-sdk-go/aws:go_default_library",
         "//vendor/github.com/aws/aws-sdk-go/aws/session:go_default_library",
         "//vendor/github.com/aws/aws-sdk-go/service/ec2:go_default_library",

test/e2e/storage/flexvolume.go

@@ -0,0 +1,207 @@
+/*
+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"
+	"math/rand"
+	"net"
+	"path"
+
+	. "github.com/onsi/ginkgo"
+	"k8s.io/api/core/v1"
+	apierrs "k8s.io/apimachinery/pkg/api/errors"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/test/e2e/framework"
+	"k8s.io/kubernetes/test/e2e/generated"
+)
+
+const (
+	sshPort                = "22"
+	driverDir              = "test/e2e/testing-manifests/flexvolume/"
+	defaultVolumePluginDir = "/usr/libexec/kubernetes/kubelet-plugins/volume/exec"
+	// TODO: change this and config-test.sh when default flex volume install path is changed for GCI
+	// On gci, root is read-only and controller-manager containerized. Assume
+	// controller-manager has started with --flex-volume-plugin-dir equal to this
+	// (see cluster/gce/config-test.sh)
+	gciVolumePluginDir = "/etc/srv/kubernetes/kubelet-plugins/volume/exec"
+)
+
+// testFlexVolume tests that a client pod using a given flexvolume driver
+// successfully mounts it and runs
+func testFlexVolume(driver string, cs clientset.Interface, config framework.VolumeTestConfig, f *framework.Framework, clean bool) {
+	tests := []framework.VolumeTest{
+		{
+			Volume: v1.VolumeSource{
+				FlexVolume: &v1.FlexVolumeSource{
+					Driver: "k8s/" + driver,
+				},
+			},
+			File: "index.html",
+			// Must match content of examples/volumes/flexvolume/dummy(-attachable) domount
+			ExpectedContent: "Hello from flexvolume!",
+		},
+	}
+	framework.TestVolumeClient(cs, config, nil, tests)
+
+	if clean {
+		framework.VolumeTestCleanup(f, config)
+	}
+}
+
+// installFlex installs the driver found at filePath on the node and restarts
+// kubelet. If node is nil, installs on the master and restarts
+// controller-manager.
+func installFlex(node *v1.Node, vendor, driver, filePath string) {
+	flexDir := getFlexDir(node == nil, vendor, driver)
+	flexFile := path.Join(flexDir, driver)
+
+	host := ""
+	if node != nil {
+		host = framework.GetNodeExternalIP(node)
+	} else {
+		host = net.JoinHostPort(framework.GetMasterHost(), sshPort)
+	}
+
+	cmd := fmt.Sprintf("sudo mkdir -p %s", flexDir)
+	sshAndLog(cmd, host)
+
+	data := generated.ReadOrDie(filePath)
+	cmd = fmt.Sprintf("sudo tee <<'EOF' %s\n%s\nEOF", flexFile, string(data))
+	sshAndLog(cmd, host)
+
+	cmd = fmt.Sprintf("sudo chmod +x %s", flexFile)
+	sshAndLog(cmd, host)
+
+	if node != nil {
+		err := framework.RestartKubelet(host)
+		framework.ExpectNoError(err)
+		err = framework.WaitForKubeletUp(host)
+		framework.ExpectNoError(err)
+	} else {
+		err := framework.RestartControllerManager()
+		framework.ExpectNoError(err)
+		err = framework.WaitForControllerManagerUp()
+		framework.ExpectNoError(err)
+	}
+}
+
+func uninstallFlex(node *v1.Node, vendor, driver string) {
+	flexDir := getFlexDir(node == nil, vendor, driver)
+
+	host := ""
+	if node != nil {
+		host = framework.GetNodeExternalIP(node)
+	} else {
+		host = net.JoinHostPort(framework.GetMasterHost(), sshPort)
+	}
+
+	cmd := fmt.Sprintf("sudo rm -r %s", flexDir)
+	sshAndLog(cmd, host)
+}
+
+func getFlexDir(master bool, vendor, driver string) string {
+	volumePluginDir := defaultVolumePluginDir
+	if framework.ProviderIs("gce") {
+		if (master && framework.MasterOSDistroIs("gci")) || (!master && framework.NodeOSDistroIs("gci")) {
+			volumePluginDir = gciVolumePluginDir
+		}
+	}
+	flexDir := path.Join(volumePluginDir, fmt.Sprintf("/%s~%s/", vendor, driver))
+	return flexDir
+}
+
+func sshAndLog(cmd, host string) {
+	result, err := framework.SSH(cmd, host, framework.TestContext.Provider)
+	framework.LogSSHResult(result)
+	framework.ExpectNoError(err)
+	if result.Code != 0 {
+		framework.Failf("%s returned non-zero, stderr: %s", cmd, result.Stderr)
+	}
+}
+
+var _ = SIGDescribe("Flexvolumes [Disruptive] [Feature:FlexVolume]", func() {
+	f := framework.NewDefaultFramework("flexvolume")
+
+	// If 'false', the test won't clear its volumes upon completion. Useful for debugging,
+	// note that namespace deletion is handled by delete-namespace flag
+	clean := true
+
+	var cs clientset.Interface
+	var ns *v1.Namespace
+	var node v1.Node
+	var config framework.VolumeTestConfig
+	var suffix string
+
+	BeforeEach(func() {
+		framework.SkipUnlessProviderIs("gce")
+		framework.SkipUnlessMasterOSDistroIs("gci")
+		framework.SkipUnlessNodeOSDistroIs("debian", "gci")
+		framework.SkipUnlessSSHKeyPresent()
+
+		cs = f.ClientSet
+		ns = f.Namespace
+		nodes := framework.GetReadySchedulableNodesOrDie(f.ClientSet)
+		node = nodes.Items[rand.Intn(len(nodes.Items))]
+		config = framework.VolumeTestConfig{
+			Namespace:      ns.Name,
+			Prefix:         "flex",
+			ClientNodeName: node.Name,
+		}
+		suffix = ns.Name
+	})
+
+	It("should be mountable when non-attachable", func() {
+		driver := "dummy"
+		driverInstallAs := driver + "-" + suffix
+
+		By(fmt.Sprintf("installing flexvolume %s on node %s as %s", path.Join(driverDir, driver), node.Name, driverInstallAs))
+		installFlex(&node, "k8s", driverInstallAs, path.Join(driverDir, driver))
+
+		testFlexVolume(driverInstallAs, cs, config, f, clean)
+
+		By("waiting for flex client pod to terminate")
+		if err := f.WaitForPodTerminated(config.Prefix+"-client", ""); !apierrs.IsNotFound(err) {
+			framework.ExpectNoError(err, "Failed to wait client pod terminated: %v", err)
+		}
+
+		By(fmt.Sprintf("uninstalling flexvolume %s from node %s", driverInstallAs, node.Name))
+		uninstallFlex(&node, "k8s", driverInstallAs)
+	})
+
+	It("should be mountable when attachable", func() {
+		driver := "dummy-attachable"
+		driverInstallAs := driver + "-" + suffix
+
+		By(fmt.Sprintf("installing flexvolume %s on node %s as %s", path.Join(driverDir, driver), node.Name, driverInstallAs))
+		installFlex(&node, "k8s", driverInstallAs, path.Join(driverDir, driver))
+		By(fmt.Sprintf("installing flexvolume %s on master as %s", path.Join(driverDir, driver), driverInstallAs))
+		installFlex(nil, "k8s", driverInstallAs, path.Join(driverDir, driver))
+
+		testFlexVolume(driverInstallAs, cs, config, f, clean)
+
+		By("waiting for flex client pod to terminate")
+		if err := f.WaitForPodTerminated(config.Prefix+"-client", ""); !apierrs.IsNotFound(err) {
+			framework.ExpectNoError(err, "Failed to wait client pod terminated: %v", err)
+		}
+
+		By(fmt.Sprintf("uninstalling flexvolume %s from node %s", driverInstallAs, node.Name))
+		uninstallFlex(&node, "k8s", driverInstallAs)
+		By(fmt.Sprintf("uninstalling flexvolume %s from master", driverInstallAs))
+		uninstallFlex(nil, "k8s", driverInstallAs)
+	})
+})

test/e2e/testing-manifests/flexvolume/dummy

@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# 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.
+
+FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
+
+log() {
+	printf "$*" >&1
+}
+
+debug() {
+	echo "$(date) $*" >> "${FLEX_DUMMY_LOG}"
+}
+
+domount() {
+	debug "domount $@"
+	MNTPATH=$1
+	mkdir -p ${MNTPATH} >/dev/null 2>&1
+	mount -t tmpfs none ${MNTPATH} >/dev/null 2>&1
+	echo "Hello from flexvolume!" >> "${MNTPATH}/index.html"
+	log "{\"status\":\"Success\"}"
+	exit 0
+}
+
+unmount() {
+	debug "unmount $@"
+	MNTPATH=$1
+	rm ${MNTPATH}/index.html >/dev/null 2>&1
+	umount ${MNTPATH} >/dev/null 2>&1
+	log "{\"status\":\"Success\"}"
+	exit 0
+}
+
+op=$1
+
+if [ "$op" = "init" ]; then
+	debug "init $@"
+	log "{\"status\":\"Success\",\"capabilities\":{\"attach\":false}}"
+	exit 0
+fi
+
+shift
+
+case "$op" in
+	mount)
+		domount $*
+		;;
+	unmount)
+		unmount $*
+		;;
+	*)
+		log "{\"status\":\"Not supported\"}"
+		exit 0
+esac
+
+exit 1

test/e2e/testing-manifests/flexvolume/dummy-attachable

@@ -0,0 +1,124 @@
+#!/bin/sh
+
+# 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.
+
+FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
+
+VALID_MNTDEVICE=foo
+
+# attach always returns one valid mount device so a different device
+# showing up in a subsequent driver call implies a bug
+validateMountDeviceOrDie() {
+	MNTDEVICE=$1
+	CALL=$2
+	if [ "$MNTDEVICE" != "$VALID_MNTDEVICE" ]; then
+		log "{\"status\":\"Failure\",\"message\":\"call "${CALL}" expected device "${VALID_MNTDEVICE}", got device "${MNTDEVICE}"\"}"
+		exit 0
+	fi
+}
+
+log() {
+	printf "$*" >&1
+}
+
+debug() {
+	echo "$(date) $*" >> "${FLEX_DUMMY_LOG}"
+}
+
+attach() {
+	debug "attach $@"
+	log "{\"status\":\"Success\",\"device\":\""${VALID_MNTDEVICE}"\"}"
+	exit 0
+}
+
+detach() {
+	debug "detach $@"
+	# TODO issue 44737 detach is passed PV name, not mount device
+	log "{\"status\":\"Success\"}"
+	exit 0
+}
+
+waitforattach() {
+	debug "waitforattach $@"
+	MNTDEVICE=$1
+	validateMountDeviceOrDie "$MNTDEVICE" "waitforattach"
+	log "{\"status\":\"Success\",\"device\":\""${MNTDEVICE}"\"}"
+	exit 0
+}
+
+isattached() {
+	debug "isattached $@"
+	log "{\"status\":\"Success\",\"attached\":true}"
+	exit 0
+}
+
+domountdevice() {
+	debug "domountdevice $@"
+	MNTDEVICE=$2
+	validateMountDeviceOrDie "$MNTDEVICE" "domountdevice"
+	MNTPATH=$1
+	mkdir -p ${MNTPATH} >/dev/null 2>&1
+	mount -t tmpfs none ${MNTPATH} >/dev/null 2>&1
+	echo "Hello from flexvolume!" >> "${MNTPATH}/index.html"
+	log "{\"status\":\"Success\"}"
+	exit 0
+}
+
+unmountdevice() {
+	debug "unmountdevice $@"
+	MNTDEVICE=$2
+	validateMountDeviceOrDie "$MNTDEVICE" "unmountdevice"
+	MNTPATH=$1
+	rm "${MNTPATH}/index.html" >/dev/null 2>&1
+	umount ${MNTPATH} >/dev/null 2>&1
+	log "{\"status\":\"Success\"}"
+	exit 0
+}
+
+op=$1
+
+if [ "$op" = "init" ]; then
+	debug "init $@"
+	log "{\"status\":\"Success\",\"capabilities\":{\"attach\":true}}"
+	exit 0
+fi
+
+shift
+
+case "$op" in
+	attach)
+		attach $*
+		;;
+	detach)
+		detach $*
+		;;
+	waitforattach)
+		waitforattach $*
+		;;
+	isattached)
+		isattached $*
+		;;
+	mountdevice)
+		domountdevice $*
+		;;
+	unmountdevice)
+		unmountdevice $*
+		;;
+	*)
+		log "{\"status\":\"Not supported\"}"
+		exit 0
+esac
+
+exit 1