empty_dir.go

/*
Copyright 2015 The Kubernetes Authors All rights reserved.

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 e2e

import (
	"fmt"
	"path"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/latest"
	"k8s.io/kubernetes/pkg/api/unversioned"
	"k8s.io/kubernetes/pkg/util"

	. "github.com/onsi/ginkgo"
)

const (
	testImageRootUid    = "gcr.io/google_containers/mounttest:0.4"
	testImageNonRootUid = "gcr.io/google_containers/mounttest-user:0.2"
)

var _ = Describe("EmptyDir volumes", func() {

	f := NewFramework("emptydir")

	It("volume on tmpfs should have the correct mode [Conformance]", func() {
		doTestVolumeMode(f, testImageRootUid, api.StorageMediumMemory)
	})

	It("should support (root,0644,tmpfs) [Conformance]", func() {
		doTest0644(f, testImageRootUid, api.StorageMediumMemory)
	})

	It("should support (root,0666,tmpfs) [Conformance]", func() {
		doTest0666(f, testImageRootUid, api.StorageMediumMemory)
	})

	It("should support (root,0777,tmpfs) [Conformance]", func() {
		doTest0777(f, testImageRootUid, api.StorageMediumMemory)
	})

	It("should support (non-root,0644,tmpfs) [Conformance]", func() {
		doTest0644(f, testImageNonRootUid, api.StorageMediumMemory)
	})

	It("should support (non-root,0666,tmpfs) [Conformance]", func() {
		doTest0666(f, testImageNonRootUid, api.StorageMediumMemory)
	})

	It("should support (non-root,0777,tmpfs) [Conformance]", func() {
		doTest0777(f, testImageNonRootUid, api.StorageMediumMemory)
	})

	It("volume on default medium should have the correct mode [Conformance]", func() {
		doTestVolumeMode(f, testImageRootUid, api.StorageMediumDefault)
	})

	It("should support (root,0644,default) [Conformance]", func() {
		doTest0644(f, testImageRootUid, api.StorageMediumDefault)
	})

	It("should support (root,0666,default) [Conformance]", func() {
		doTest0666(f, testImageRootUid, api.StorageMediumDefault)
	})

	It("should support (root,0777,default) [Conformance]", func() {
		doTest0777(f, testImageRootUid, api.StorageMediumDefault)
	})

	It("should support (non-root,0644,default) [Conformance]", func() {
		doTest0644(f, testImageNonRootUid, api.StorageMediumDefault)
	})

	It("should support (non-root,0666,default) [Conformance]", func() {
		doTest0666(f, testImageNonRootUid, api.StorageMediumDefault)
	})

	It("should support (non-root,0777,default) [Conformance]", func() {
		doTest0777(f, testImageNonRootUid, api.StorageMediumDefault)
	})
})

const (
	containerName = "test-container"
	volumeName    = "test-volume"
)

func doTestVolumeMode(f *Framework, image string, medium api.StorageMedium) {
	var (
		volumePath = "/test-volume"
		source     = &api.EmptyDirVolumeSource{Medium: medium}
		pod        = testPodWithVolume(testImageRootUid, volumePath, source)
	)

	pod.Spec.Containers[0].Args = []string{
		fmt.Sprintf("--fs_type=%v", volumePath),
		fmt.Sprintf("--file_perm=%v", volumePath),
	}

	msg := fmt.Sprintf("emptydir volume type on %v", formatMedium(medium))
	out := []string{
		"perms of file \"/test-volume\": -rwxrwxrwx",
	}
	if medium == api.StorageMediumMemory {
		out = append(out, "mount type of \"/test-volume\": tmpfs")
	}
	f.TestContainerOutput(msg, pod, 0, out)
}

func doTest0644(f *Framework, image string, medium api.StorageMedium) {
	var (
		volumePath = "/test-volume"
		filePath   = path.Join(volumePath, "test-file")
		source     = &api.EmptyDirVolumeSource{Medium: medium}
		pod        = testPodWithVolume(image, volumePath, source)
	)

	pod.Spec.Containers[0].Args = []string{
		fmt.Sprintf("--fs_type=%v", volumePath),
		fmt.Sprintf("--new_file_0644=%v", filePath),
		fmt.Sprintf("--file_perm=%v", filePath),
	}

	msg := fmt.Sprintf("emptydir 0644 on %v", formatMedium(medium))
	out := []string{
		"perms of file \"/test-volume/test-file\": -rw-r--r--",
		"content of file \"/test-volume/test-file\": mount-tester new file",
	}
	if medium == api.StorageMediumMemory {
		out = append(out, "mount type of \"/test-volume\": tmpfs")
	}
	f.TestContainerOutput(msg, pod, 0, out)
}

func doTest0666(f *Framework, image string, medium api.StorageMedium) {
	var (
		volumePath = "/test-volume"
		filePath   = path.Join(volumePath, "test-file")
		source     = &api.EmptyDirVolumeSource{Medium: medium}
		pod        = testPodWithVolume(image, volumePath, source)
	)

	pod.Spec.Containers[0].Args = []string{
		fmt.Sprintf("--fs_type=%v", volumePath),
		fmt.Sprintf("--new_file_0666=%v", filePath),
		fmt.Sprintf("--file_perm=%v", filePath),
	}

	msg := fmt.Sprintf("emptydir 0666 on %v", formatMedium(medium))
	out := []string{
		"perms of file \"/test-volume/test-file\": -rw-rw-rw-",
		"content of file \"/test-volume/test-file\": mount-tester new file",
	}
	if medium == api.StorageMediumMemory {
		out = append(out, "mount type of \"/test-volume\": tmpfs")
	}
	f.TestContainerOutput(msg, pod, 0, out)
}

func doTest0777(f *Framework, image string, medium api.StorageMedium) {
	var (
		volumePath = "/test-volume"
		filePath   = path.Join(volumePath, "test-file")
		source     = &api.EmptyDirVolumeSource{Medium: medium}
		pod        = testPodWithVolume(image, volumePath, source)
	)

	pod.Spec.Containers[0].Args = []string{
		fmt.Sprintf("--fs_type=%v", volumePath),
		fmt.Sprintf("--new_file_0777=%v", filePath),
		fmt.Sprintf("--file_perm=%v", filePath),
	}

	msg := fmt.Sprintf("emptydir 0777 on %v", formatMedium(medium))
	out := []string{
		"perms of file \"/test-volume/test-file\": -rwxrwxrwx",
		"content of file \"/test-volume/test-file\": mount-tester new file",
	}
	if medium == api.StorageMediumMemory {
		out = append(out, "mount type of \"/test-volume\": tmpfs")
	}
	f.TestContainerOutput(msg, pod, 0, out)
}

func formatMedium(medium api.StorageMedium) string {
	if medium == api.StorageMediumMemory {
		return "tmpfs"
	}

	return "node default medium"
}

func testPodWithVolume(image, path string, source *api.EmptyDirVolumeSource) *api.Pod {
	podName := "pod-" + string(util.NewUUID())
	return &api.Pod{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "Pod",
			APIVersion: latest.GroupOrDie("").Version,
		},
		ObjectMeta: api.ObjectMeta{
			Name: podName,
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:  containerName,
					Image: image,
					VolumeMounts: []api.VolumeMount{
						{
							Name:      volumeName,
							MountPath: path,
						},
					},
				},
			},
			RestartPolicy: api.RestartPolicyNever,
			Volumes: []api.Volume{
				{
					Name: volumeName,
					VolumeSource: api.VolumeSource{
						EmptyDir: source,
					},
				},
			},
		},
	}
}