Golang client.CreateApp函數代碼示例

func (h *Helper) createApp(t *c.C) (*ct.App, *ct.Release) {
	client := h.controllerClient(t)

	app := &ct.App{}
	t.Assert(client.CreateApp(app), c.IsNil)
	debugf(t, "created app %s (%s)", app.Name, app.ID)

	artifact := &ct.Artifact{Type: "docker", URI: imageURIs["test-apps"]}
	t.Assert(client.CreateArtifact(artifact), c.IsNil)

	release := &ct.Release{
		ArtifactID: artifact.ID,
		Processes: map[string]ct.ProcessType{
			"echoer": {
				Cmd:     []string{"/bin/echoer"},
				Service: "echo-service",
				Ports: []ct.Port{{
					Proto: "tcp",
					Service: &host.Service{
						Name:   "echo-service",
						Create: true,
					},
				}},
			},
			"ping": {
				Cmd:   []string{"/bin/pingserv"},
				Ports: []ct.Port{{Proto: "tcp"}},
			},
			"printer": {
				Cmd: []string{"sh", "-c", "while true; do echo I like to print; sleep 1; done"},
			},
			"crasher": {
				Cmd: []string{"sh", "-c", "trap 'exit 1' SIGTERM; while true; do echo I like to crash; sleep 1; done"},
			},
			"omni": {
				Cmd:  []string{"sh", "-c", "while true; do echo I am everywhere; sleep 1; done"},
				Omni: true,
			},
			"resources": {
				Cmd:       []string{"sh", "-c", resourceCmd},
				Resources: testResources(),
			},
			"ish": {
				Cmd:   []string{"/bin/ish"},
				Ports: []ct.Port{{Proto: "tcp"}},
				Env: map[string]string{
					"NAME": app.Name,
				},
			},
		},
	}
	t.Assert(client.CreateRelease(release), c.IsNil)
	t.Assert(client.SetAppRelease(app.ID, release.ID), c.IsNil)
	return app, release
}

func (s *CLISuite) TestDockerPush(t *c.C) {
	// build image with ENV and CMD
	repo := "cli-test-push"
	s.buildDockerImage(t, repo,
		`ENV FOO=BAR`,
		`CMD ["/bin/pingserv"]`,
	)

	// create app
	client := s.controllerClient(t)
	app := &ct.App{Name: "cli-test-docker-push"}
	t.Assert(client.CreateApp(app), c.IsNil)

	// flynn docker push image
	t.Assert(flynn(t, "/", "-a", app.Name, "docker", "push", repo), Succeeds)

	// check app was released with correct env, meta and process type
	release, err := client.GetAppRelease(app.ID)
	t.Assert(err, c.IsNil)
	t.Assert(release.Env["FOO"], c.Equals, "BAR")
	t.Assert(release.Meta["docker-receive"], c.Equals, "true")
	t.Assert(release.Processes, c.HasLen, 1)
	proc, ok := release.Processes["app"]
	if !ok {
		t.Fatal(`release missing "app" process type`)
	}
	t.Assert(proc.Args, c.DeepEquals, []string{"/bin/pingserv"})

	// check updated env vars are not overwritten
	//
	// need to remove the tag before pushing as we are using Docker 1.9
	// which does not overwrite tags.
	// TODO: remove this when upgrading Docker > 1.9
	u, err := url.Parse(s.clusterConf(t).DockerPushURL)
	t.Assert(err, c.IsNil)
	tag := fmt.Sprintf("%s/%s:latest", u.Host, app.Name)
	t.Assert(run(t, exec.Command("docker", "rmi", tag)), Succeeds)
	t.Assert(flynn(t, "/", "-a", app.Name, "env", "set", "FOO=BAZ"), Succeeds)
	t.Assert(flynn(t, "/", "-a", app.Name, "docker", "push", repo), Succeeds)
	t.Assert(flynn(t, "/", "-a", app.Name, "env", "get", "FOO"), Outputs, "BAZ\n")

	// check the release can be scaled up
	t.Assert(flynn(t, "/", "-a", app.Name, "scale", "app=1"), Succeeds)

	// check the job is reachable with the app's name in discoverd
	instances, err := s.discoverdClient(t).Instances(app.Name+"-web", 10*time.Second)
	t.Assert(err, c.IsNil)
	res, err := hh.RetryClient.Get("http://" + instances[0].Addr)
	t.Assert(err, c.IsNil)
	defer res.Body.Close()
	body, err := ioutil.ReadAll(res.Body)
	t.Assert(err, c.IsNil)
	t.Assert(string(body), c.Equals, "OK")
}

func (s *CLISuite) TestReleaseDelete(t *c.C) {
	// create an app and release it twice
	r := s.newGitRepo(t, "http")
	app := "release-delete-" + random.String(8)
	t.Assert(r.flynn("create", app), Succeeds)
	t.Assert(r.git("push", "flynn", "master"), Succeeds)
	t.Assert(r.git("commit", "--allow-empty", "--message", "empty commit"), Succeeds)
	t.Assert(r.git("push", "flynn", "master"), Succeeds)

	// get the releases
	client := s.controllerClient(t)
	releases, err := client.AppReleaseList(app)
	t.Assert(err, c.IsNil)
	t.Assert(releases, c.HasLen, 2)

	// check the current release cannot be deleted
	res := r.flynn("release", "delete", "--yes", releases[0].ID)
	t.Assert(res, c.Not(Succeeds))
	t.Assert(res.Output, c.Equals, "validation_error: cannot delete current app release\n")

	// associate the initial release with another app
	otherApp := &ct.App{Name: "release-delete-" + random.String(8)}
	t.Assert(client.CreateApp(otherApp), c.IsNil)
	t.Assert(client.PutFormation(&ct.Formation{AppID: otherApp.ID, ReleaseID: releases[1].ID}), c.IsNil)

	// check deleting the initial release just deletes the formation
	res = r.flynn("release", "delete", "--yes", releases[1].ID)
	t.Assert(res, Succeeds)
	t.Assert(res.Output, c.Equals, "Release scaled down for app but not fully deleted (still associated with 1 other apps)\n")

	// check the slug artifact still exists
	slugArtifact, err := client.GetArtifact(releases[1].ArtifactIDs[1])
	t.Assert(err, c.IsNil)
	s.assertURI(t, slugArtifact.URI, http.StatusOK)
	slugLayerURL := slugArtifact.LayerURL(slugArtifact.Manifest().Rootfs[0].Layers[0])
	s.assertURI(t, slugLayerURL, http.StatusOK)

	// check the inital release can now be deleted
	res = r.flynn("-a", otherApp.ID, "release", "delete", "--yes", releases[1].ID)
	t.Assert(res, Succeeds)
	t.Assert(res.Output, c.Equals, fmt.Sprintf("Deleted release %s (deleted 2 files)\n", releases[1].ID))

	// check the slug artifact was deleted
	_, err = client.GetArtifact(slugArtifact.ID)
	t.Assert(err, c.Equals, controller.ErrNotFound)
	s.assertURI(t, slugArtifact.URI, http.StatusNotFound)
	s.assertURI(t, slugLayerURL, http.StatusNotFound)

	// check the image artifact was not deleted (since it is shared between both releases)
	_, err = client.GetArtifact(releases[1].ArtifactIDs[0])
	t.Assert(err, c.IsNil)
}

func (s *CLISuite) TestDockerExportImport(t *c.C) {
	// release via docker-receive
	client := s.controllerClient(t)
	app := &ct.App{Name: "cli-test-docker-export"}
	t.Assert(client.CreateApp(app), c.IsNil)
	repo := "cli-test-export"
	s.buildDockerImage(t, repo, `CMD ["/bin/pingserv"]`)
	t.Assert(flynn(t, "/", "-a", app.Name, "docker", "push", repo), Succeeds)
	t.Assert(flynn(t, "/", "-a", app.Name, "scale", "app=1"), Succeeds)
	defer flynn(t, "/", "-a", app.Name, "scale", "app=0")

	// export the app
	file := filepath.Join(t.MkDir(), "export.tar")
	t.Assert(flynn(t, "/", "-a", app.Name, "export", "-f", file), Succeeds)

	// delete the image from the registry
	release, err := client.GetAppRelease(app.Name)
	t.Assert(err, c.IsNil)
	artifact, err := client.GetArtifact(release.ImageArtifactID())
	t.Assert(err, c.IsNil)
	u, err := url.Parse(s.clusterConf(t).DockerPushURL)
	t.Assert(err, c.IsNil)
	uri := fmt.Sprintf("http://%s/v2/%s/manifests/%s", u.Host, app.Name, artifact.Meta["docker-receive.digest"])
	req, err := http.NewRequest("DELETE", uri, nil)
	req.SetBasicAuth("", s.clusterConf(t).Key)
	t.Assert(err, c.IsNil)
	res, err := http.DefaultClient.Do(req)
	t.Assert(err, c.IsNil)
	res.Body.Close()

	// import to another app
	importApp := "cli-test-docker-import"
	t.Assert(flynn(t, "/", "import", "--name", importApp, "--file", file), Succeeds)
	defer flynn(t, "/", "-a", importApp, "scale", "app=0")

	// wait for it to start
	_, err = s.discoverdClient(t).Instances(importApp+"-web", 10*time.Second)
	t.Assert(err, c.IsNil)
}

func (h *Helper) createApp(t *c.C) (*ct.App, *ct.Release) {
	client := h.controllerClient(t)

	app := &ct.App{}
	t.Assert(client.CreateApp(app), c.IsNil)
	debugf(t, "created app %s (%s)", app.Name, app.ID)

	artifact := h.newSlugrunnerArtifact(t)
	t.Assert(client.CreateArtifact(artifact), c.IsNil)

	release := &ct.Release{
		ArtifactID: artifact.ID,
		Processes: map[string]ct.ProcessType{
			"echoer": {
				Entrypoint: []string{"bash", "-c"},
				Cmd:        []string{"sdutil exec -s echo-service:$PORT socat -v tcp-l:$PORT,fork exec:/bin/cat"},
				Ports:      []ct.Port{{Proto: "tcp"}},
			},
			"printer": {
				Entrypoint: []string{"bash", "-c"},
				Cmd:        []string{"while true; do echo I like to print; sleep 1; done"},
				Ports:      []ct.Port{{Proto: "tcp"}},
			},
			"crasher": {
				Entrypoint: []string{"bash", "-c"},
				Cmd:        []string{"trap 'exit 1' SIGTERM; while true; do echo I like to crash; sleep 1; done"},
			},
			"omni": {
				Entrypoint: []string{"bash", "-c"},
				Cmd:        []string{"while true; do echo I am everywhere; sleep 1; done"},
				Omni:       true,
			},
		},
	}
	t.Assert(client.CreateRelease(release), c.IsNil)
	t.Assert(client.SetAppRelease(app.ID, release.ID), c.IsNil)
	return app, release
}

func (s *ControllerSuite) TestAppDelete(t *c.C) {
	client := s.controllerClient(t)

	type test struct {
		desc    string
		name    string
		create  bool
		useName bool
		delErr  error
	}

	for _, s := range []test{
		{
			desc:    "delete existing app by name",
			name:    "app-delete-" + random.String(8),
			create:  true,
			useName: true,
			delErr:  nil,
		},
		{
			desc:    "delete existing app by id",
			name:    "app-delete-" + random.String(8),
			create:  true,
			useName: false,
			delErr:  nil,
		},
		{
			desc:    "delete existing UUID app by name",
			name:    random.UUID(),
			create:  true,
			useName: true,
			delErr:  nil,
		},
		{
			desc:    "delete existing UUID app by id",
			name:    random.UUID(),
			create:  true,
			useName: false,
			delErr:  nil,
		},
		{
			desc:    "delete non-existent app",
			name:    "i-dont-exist",
			create:  false,
			useName: true,
			delErr:  controller.ErrNotFound,
		},
		{
			desc:    "delete non-existent UUID app",
			name:    random.UUID(),
			create:  false,
			useName: true,
			delErr:  controller.ErrNotFound,
		},
	} {
		debugf(t, "TestAppDelete: %s", s.desc)

		app := &ct.App{Name: s.name}
		if s.create {
			t.Assert(client.CreateApp(app), c.IsNil)
		}

		appID := app.ID
		if s.useName {
			appID = app.Name
		}

		_, err := client.DeleteApp(appID)
		t.Assert(err, c.Equals, s.delErr)

		if s.delErr == nil {
			_, err = client.GetApp(appID)
			t.Assert(err, c.Equals, controller.ErrNotFound)
		}
	}
}

func (s *CLISuite) TestDockerExportImport(t *c.C) {
	// release via docker-receive
	client := s.controllerClient(t)
	app := &ct.App{Name: "cli-test-docker-export"}
	t.Assert(client.CreateApp(app), c.IsNil)
	repo := "cli-test-export"
	s.buildDockerImage(t, repo, `CMD ["/bin/pingserv"]`)
	t.Assert(flynn(t, "/", "-a", app.Name, "docker", "push", repo), Succeeds)
	t.Assert(flynn(t, "/", "-a", app.Name, "scale", "app=1"), Succeeds)
	defer flynn(t, "/", "-a", app.Name, "scale", "app=0")

	// grab the Flynn image layers
	release, err := client.GetAppRelease(app.ID)
	t.Assert(err, c.IsNil)
	artifact, err := client.GetArtifact(release.ArtifactIDs[0])
	t.Assert(err, c.IsNil)
	layers := artifact.Manifest().Rootfs[0].Layers
	layerNames := make([]string, len(layers))
	for i, layer := range layers {
		layerNames[i] = layer.ID + ".layer"
	}

	// check exporting to stdout works
	file := filepath.Join(t.MkDir(), "export.tar")
	cmd := exec.Command("sh", "-c", fmt.Sprintf("%s -a %s export > %s", args.CLI, app.Name, file))
	cmd.Env = flynnEnv(flynnrc)
	var stderr bytes.Buffer
	cmd.Stderr = &stderr
	if args.Stream {
		cmd.Stderr = io.MultiWriter(os.Stderr, &stderr)
	}
	if err := cmd.Run(); err != nil {
		t.Fatalf("error exporting docker app to stdout: %s: %s", err, stderr.String())
	}
	exportFiles := append([]string{
		"app.json", "routes.json", "release.json", "artifacts.json",
	}, append(layerNames, "formation.json")...)
	assertExportContains(t, file, exportFiles...)

	// export the app directly to the file
	t.Assert(flynn(t, "/", "-a", app.Name, "export", "-f", file), Succeeds)
	assertExportContains(t, file, exportFiles...)

	// delete the image from the registry
	u, err := url.Parse(s.clusterConf(t).DockerPushURL)
	t.Assert(err, c.IsNil)
	uri := fmt.Sprintf("http://%s/v2/%s/manifests/%s", u.Host, app.Name, artifact.Meta["docker-receive.digest"])
	req, err := http.NewRequest("DELETE", uri, nil)
	req.SetBasicAuth("", s.clusterConf(t).Key)
	t.Assert(err, c.IsNil)
	res, err := http.DefaultClient.Do(req)
	t.Assert(err, c.IsNil)
	res.Body.Close()

	// import to another app
	importApp := "cli-test-docker-import"
	t.Assert(flynn(t, "/", "import", "--name", importApp, "--file", file), Succeeds)
	defer flynn(t, "/", "-a", importApp, "scale", "app=0")

	// wait for it to start
	_, err = s.discoverdClient(t).Instances(importApp+"-web", 10*time.Second)
	t.Assert(err, c.IsNil)
}

func (s *CLISuite) TestSlugReleaseGarbageCollection(t *c.C) {
	client := s.controllerClient(t)

	// create app with gc.max_inactive_slug_releases=3
	maxInactiveSlugReleases := 3
	app := &ct.App{Meta: map[string]string{"gc.max_inactive_slug_releases": strconv.Itoa(maxInactiveSlugReleases)}}
	t.Assert(client.CreateApp(app), c.IsNil)

	// create an image artifact
	imageArtifact := s.createArtifact(t, "test-apps")

	// create 5 slug artifacts
	tmp, err := ioutil.TempFile("", "squashfs-")
	t.Assert(err, c.IsNil)
	defer os.Remove(tmp.Name())
	defer tmp.Close()
	t.Assert(exec.Command("mksquashfs", t.MkDir(), tmp.Name(), "-noappend").Run(), c.IsNil)
	slug, err := ioutil.ReadAll(tmp)
	t.Assert(err, c.IsNil)
	slugHash := sha512.Sum512(slug)
	slugs := []string{
		"http://blobstore.discoverd/layer/1.squashfs",
		"http://blobstore.discoverd/layer/2.squashfs",
		"http://blobstore.discoverd/layer/3.squashfs",
		"http://blobstore.discoverd/layer/4.squashfs",
		"http://blobstore.discoverd/layer/5.squashfs",
	}
	slugArtifacts := make([]*ct.Artifact, len(slugs))
	put := func(url string, data []byte) {
		req, err := http.NewRequest("PUT", url, bytes.NewReader(data))
		t.Assert(err, c.IsNil)
		res, err := http.DefaultClient.Do(req)
		t.Assert(err, c.IsNil)
		res.Body.Close()
		t.Assert(res.StatusCode, c.Equals, http.StatusOK)
	}
	for i, layerURL := range slugs {
		manifest := &ct.ImageManifest{
			Type: ct.ImageManifestTypeV1,
			Rootfs: []*ct.ImageRootfs{{
				Layers: []*ct.ImageLayer{{
					ID:     strconv.Itoa(i + 1),
					Type:   ct.ImageLayerTypeSquashfs,
					Length: int64(len(slug)),
					Hashes: map[string]string{"sha512": hex.EncodeToString(slugHash[:])},
				}},
			}},
		}
		data := manifest.RawManifest()
		url := fmt.Sprintf("http://blobstore.discoverd/image/%s.json", manifest.ID())
		put(url, data)
		put(layerURL, slug)
		artifact := &ct.Artifact{
			Type:             ct.ArtifactTypeFlynn,
			URI:              url,
			Meta:             map[string]string{"blobstore": "true"},
			RawManifest:      data,
			Hashes:           manifest.Hashes(),
			Size:             int64(len(data)),
			LayerURLTemplate: "http://blobstore.discoverd/layer/{id}.squashfs",
		}
		t.Assert(client.CreateArtifact(artifact), c.IsNil)
		slugArtifacts[i] = artifact
	}

	// create 6 releases, the second being scaled up and having the
	// same slug as the third (so prevents the slug being deleted)
	releases := make([]*ct.Release, 6)
	for i, r := range []struct {
		slug   *ct.Artifact
		active bool
	}{
		{slugArtifacts[0], false},
		{slugArtifacts[1], true},
		{slugArtifacts[1], false},
		{slugArtifacts[2], false},
		{slugArtifacts[3], false},
		{slugArtifacts[4], false},
	} {
		release := &ct.Release{
			ArtifactIDs: []string{imageArtifact.ID, r.slug.ID},
			Processes: map[string]ct.ProcessType{
				"app": {Args: []string{"/bin/pingserv"}, Ports: []ct.Port{{Proto: "tcp"}}},
			},
			Meta: map[string]string{"git": "true"},
		}
		t.Assert(client.CreateRelease(release), c.IsNil)
		procs := map[string]int{"app": 0}
		if r.active {
			procs["app"] = 1
		}
		t.Assert(client.PutFormation(&ct.Formation{
			AppID:     app.ID,
			ReleaseID: release.ID,
			Processes: procs,
		}), c.IsNil)
		releases[i] = release
	}

	// scale the last release so we can deploy it
//.........這裏部分代碼省略.........

func (s *ReleaseSuite) TestReleaseImages(t *c.C) {
	if testCluster == nil {
		t.Skip("cannot boot release cluster")
	}

	// stream script output to t.Log
	logReader, logWriter := io.Pipe()
	defer logWriter.Close()
	go func() {
		buf := bufio.NewReader(logReader)
		for {
			line, err := buf.ReadString('\n')
			if err != nil {
				return
			}
			debug(t, line[0:len(line)-1])
		}
	}()

	// boot the release cluster, release components to a blobstore and output the new images.json
	releaseCluster := s.addReleaseHosts(t)
	buildHost := releaseCluster.Instances[0]
	var imagesJSON bytes.Buffer
	var script bytes.Buffer
	slugImageID := random.UUID()
	releaseScript.Execute(&script, struct{ ControllerKey, SlugImageID string }{releaseCluster.ControllerKey, slugImageID})
	t.Assert(buildHost.Run("bash -ex", &tc.Streams{Stdin: &script, Stdout: &imagesJSON, Stderr: logWriter}), c.IsNil)
	var images map[string]*ct.Artifact
	t.Assert(json.Unmarshal(imagesJSON.Bytes(), &images), c.IsNil)

	// install Flynn from the blobstore on the vanilla host
	blobstoreAddr := buildHost.IP + ":8080"
	installHost := releaseCluster.Instances[3]
	script.Reset()
	installScript.Execute(&script, map[string]string{"Blobstore": blobstoreAddr})
	var installOutput bytes.Buffer
	out := io.MultiWriter(logWriter, &installOutput)
	t.Assert(installHost.Run("sudo bash -ex", &tc.Streams{Stdin: &script, Stdout: out, Stderr: out}), c.IsNil)

	// check the flynn-host version is correct
	var hostVersion bytes.Buffer
	t.Assert(installHost.Run("flynn-host version", &tc.Streams{Stdout: &hostVersion}), c.IsNil)
	t.Assert(strings.TrimSpace(hostVersion.String()), c.Equals, "v20161108.0-test")

	// check rebuilt images were downloaded
	assertInstallOutput := func(format string, v ...interface{}) {
		expected := fmt.Sprintf(format, v...)
		if !strings.Contains(installOutput.String(), expected) {
			t.Fatalf(`expected install to output %q`, expected)
		}
	}
	for name, image := range images {
		assertInstallOutput("pulling %s image", name)
		for _, layer := range image.Manifest().Rootfs[0].Layers {
			assertInstallOutput("pulling %s layer %s", name, layer.ID)
		}
	}

	// installing on an instance with Flynn running should fail
	script.Reset()
	installScript.Execute(&script, map[string]string{"Blobstore": blobstoreAddr})
	installOutput.Reset()
	err := buildHost.Run("sudo bash -ex", &tc.Streams{Stdin: &script, Stdout: out, Stderr: out})
	if err == nil || !strings.Contains(installOutput.String(), "ERROR: Flynn is already installed.") {
		t.Fatal("expected Flynn install to fail but it didn't")
	}

	// create a controller client for the release cluster
	pin, err := base64.StdEncoding.DecodeString(releaseCluster.ControllerPin)
	t.Assert(err, c.IsNil)
	client, err := controller.NewClientWithConfig(
		"https://"+buildHost.IP,
		releaseCluster.ControllerKey,
		controller.Config{Pin: pin, Domain: releaseCluster.ControllerDomain},
	)
	t.Assert(err, c.IsNil)

	// deploy a slug based app + Redis resource
	slugApp := &ct.App{}
	t.Assert(client.CreateApp(slugApp), c.IsNil)
	gitreceive, err := client.GetAppRelease("gitreceive")
	t.Assert(err, c.IsNil)
	imageArtifact, err := client.GetArtifact(gitreceive.Env["SLUGRUNNER_IMAGE_ID"])
	t.Assert(err, c.IsNil)
	slugArtifact, err := client.GetArtifact(slugImageID)
	t.Assert(err, c.IsNil)
	resource, err := client.ProvisionResource(&ct.ResourceReq{ProviderID: "redis", Apps: []string{slugApp.ID}})
	t.Assert(err, c.IsNil)
	release := &ct.Release{
		ArtifactIDs: []string{imageArtifact.ID, slugArtifact.ID},
		Processes:   map[string]ct.ProcessType{"web": {Args: []string{"/runner/init", "bin/http"}}},
		Meta:        map[string]string{"git": "true"},
		Env:         resource.Env,
	}
	t.Assert(client.CreateRelease(release), c.IsNil)
	t.Assert(client.SetAppRelease(slugApp.ID, release.ID), c.IsNil)
	watcher, err := client.WatchJobEvents(slugApp.ID, release.ID)
	t.Assert(err, c.IsNil)
	defer watcher.Close()
	t.Assert(client.PutFormation(&ct.Formation{
//.........這裏部分代碼省略.........

func (s *CLISuite) TestSlugReleaseGarbageCollection(t *c.C) {
	client := s.controllerClient(t)

	// create app with gc.max_inactive_slug_releases=3
	maxInactiveSlugReleases := 3
	app := &ct.App{Meta: map[string]string{"gc.max_inactive_slug_releases": strconv.Itoa(maxInactiveSlugReleases)}}
	t.Assert(client.CreateApp(app), c.IsNil)

	// create an image artifact
	imageArtifact := &ct.Artifact{Type: host.ArtifactTypeDocker, URI: imageURIs["test-apps"]}
	t.Assert(client.CreateArtifact(imageArtifact), c.IsNil)

	// create 5 slug artifacts
	var slug bytes.Buffer
	gz := gzip.NewWriter(&slug)
	t.Assert(tar.NewWriter(gz).Close(), c.IsNil)
	t.Assert(gz.Close(), c.IsNil)
	slugs := []string{
		"http://blobstore.discoverd/1/slug.tgz",
		"http://blobstore.discoverd/2/slug.tgz",
		"http://blobstore.discoverd/3/slug.tgz",
		"http://blobstore.discoverd/4/slug.tgz",
		"http://blobstore.discoverd/5/slug.tgz",
	}
	slugArtifacts := make([]*ct.Artifact, len(slugs))
	for i, uri := range slugs {
		req, err := http.NewRequest("PUT", uri, bytes.NewReader(slug.Bytes()))
		t.Assert(err, c.IsNil)
		res, err := http.DefaultClient.Do(req)
		t.Assert(err, c.IsNil)
		res.Body.Close()
		t.Assert(res.StatusCode, c.Equals, http.StatusOK)
		artifact := &ct.Artifact{
			Type: host.ArtifactTypeFile,
			URI:  uri,
			Meta: map[string]string{"blobstore": "true"},
		}
		t.Assert(client.CreateArtifact(artifact), c.IsNil)
		slugArtifacts[i] = artifact
	}

	// create 6 releases, the second being scaled up and having the
	// same slug as the third (so prevents the slug being deleted)
	releases := make([]*ct.Release, 6)
	for i, r := range []struct {
		slug   *ct.Artifact
		active bool
	}{
		{slugArtifacts[0], false},
		{slugArtifacts[1], true},
		{slugArtifacts[1], false},
		{slugArtifacts[2], false},
		{slugArtifacts[3], false},
		{slugArtifacts[4], false},
	} {
		release := &ct.Release{
			ArtifactIDs: []string{imageArtifact.ID, r.slug.ID},
			Processes: map[string]ct.ProcessType{
				"app": {Args: []string{"/bin/pingserv"}, Ports: []ct.Port{{Proto: "tcp"}}},
			},
		}
		t.Assert(client.CreateRelease(release), c.IsNil)
		procs := map[string]int{"app": 0}
		if r.active {
			procs["app"] = 1
		}
		t.Assert(client.PutFormation(&ct.Formation{
			AppID:     app.ID,
			ReleaseID: release.ID,
			Processes: procs,
		}), c.IsNil)
		releases[i] = release
	}

	// scale the last release so we can deploy it
	lastRelease := releases[len(releases)-1]
	watcher, err := client.WatchJobEvents(app.ID, lastRelease.ID)
	t.Assert(err, c.IsNil)
	defer watcher.Close()
	t.Assert(client.PutFormation(&ct.Formation{
		AppID:     app.ID,
		ReleaseID: lastRelease.ID,
		Processes: map[string]int{"app": 1},
	}), c.IsNil)
	t.Assert(watcher.WaitFor(ct.JobEvents{"app": ct.JobUpEvents(1)}, scaleTimeout, nil), c.IsNil)
	t.Assert(client.SetAppRelease(app.ID, lastRelease.ID), c.IsNil)

	// subscribe to garbage collection events
	gcEvents := make(chan *ct.Event)
	stream, err := client.StreamEvents(ct.StreamEventsOptions{
		AppID:       app.ID,
		ObjectTypes: []ct.EventType{ct.EventTypeAppGarbageCollection},
	}, gcEvents)
	t.Assert(err, c.IsNil)
	defer stream.Close()

	// deploy a new release with the same slug as the last release
	timeoutCh := make(chan struct{})
	time.AfterFunc(5*time.Minute, func() { close(timeoutCh) })
	newRelease := *lastRelease
//.........這裏部分代碼省略.........

func (s *ReleaseSuite) TestReleaseImages(t *c.C) {
	if testCluster == nil {
		t.Skip("cannot boot release cluster")
	}

	// stream script output to t.Log
	logReader, logWriter := io.Pipe()
	defer logWriter.Close()
	go func() {
		buf := bufio.NewReader(logReader)
		for {
			line, err := buf.ReadString('\n')
			if err != nil {
				return
			}
			debug(t, line[0:len(line)-1])
		}
	}()

	// boot the release cluster, release components to a blobstore and output the new version.json
	releaseCluster := s.addReleaseHosts(t)
	buildHost := releaseCluster.Instances[0]
	var versionJSON bytes.Buffer
	t.Assert(buildHost.Run("bash -ex", &tc.Streams{Stdin: releaseScript, Stdout: &versionJSON, Stderr: logWriter}), c.IsNil)
	var versions map[string]string
	t.Assert(json.Unmarshal(versionJSON.Bytes(), &versions), c.IsNil)

	// install Flynn from the blobstore on the vanilla host
	blobstore := struct{ Blobstore string }{buildHost.IP + ":8080"}
	installHost := releaseCluster.Instances[3]
	var script bytes.Buffer
	installScript.Execute(&script, blobstore)
	var installOutput bytes.Buffer
	out := io.MultiWriter(logWriter, &installOutput)
	t.Assert(installHost.Run("sudo bash -ex", &tc.Streams{Stdin: &script, Stdout: out, Stderr: out}), c.IsNil)

	// check the flynn-host version is correct
	var hostVersion bytes.Buffer
	t.Assert(installHost.Run("flynn-host version", &tc.Streams{Stdout: &hostVersion}), c.IsNil)
	t.Assert(strings.TrimSpace(hostVersion.String()), c.Equals, "v20150131.0-test")

	// check rebuilt images were downloaded
	for name, id := range versions {
		expected := fmt.Sprintf("%s image %s downloaded", name, id)
		if !strings.Contains(installOutput.String(), expected) {
			t.Fatalf(`expected install to download %s %s`, name, id)
		}
	}

	// installing on an instance with Flynn running should not fail
	script.Reset()
	installScript.Execute(&script, blobstore)
	t.Assert(buildHost.Run("sudo bash -ex", &tc.Streams{Stdin: &script, Stdout: logWriter, Stderr: logWriter}), c.IsNil)

	// create a controller client for the release cluster
	pin, err := base64.StdEncoding.DecodeString(releaseCluster.ControllerPin)
	t.Assert(err, c.IsNil)
	client, err := controller.NewClientWithConfig(
		"https://"+buildHost.IP,
		releaseCluster.ControllerKey,
		controller.Config{Pin: pin, Domain: releaseCluster.ControllerDomain},
	)
	t.Assert(err, c.IsNil)

	// deploy a slug based app
	slugApp := &ct.App{}
	t.Assert(client.CreateApp(slugApp), c.IsNil)
	gitreceive, err := client.GetAppRelease("gitreceive")
	t.Assert(err, c.IsNil)
	imageArtifact := &ct.Artifact{Type: host.ArtifactTypeDocker, URI: gitreceive.Env["SLUGRUNNER_IMAGE_URI"]}
	t.Assert(client.CreateArtifact(imageArtifact), c.IsNil)
	slugArtifact := &ct.Artifact{Type: host.ArtifactTypeFile, URI: fmt.Sprintf("http://%s:8080/slug.tgz", buildHost.IP)}
	t.Assert(client.CreateArtifact(slugArtifact), c.IsNil)
	release := &ct.Release{
		ArtifactIDs: []string{imageArtifact.ID, slugArtifact.ID},
		Processes:   map[string]ct.ProcessType{"web": {Cmd: []string{"bin/http"}}},
	}
	t.Assert(client.CreateRelease(release), c.IsNil)
	t.Assert(client.SetAppRelease(slugApp.ID, release.ID), c.IsNil)
	watcher, err := client.WatchJobEvents(slugApp.ID, release.ID)
	t.Assert(err, c.IsNil)
	defer watcher.Close()
	t.Assert(client.PutFormation(&ct.Formation{
		AppID:     slugApp.ID,
		ReleaseID: release.ID,
		Processes: map[string]int{"web": 1},
	}), c.IsNil)
	err = watcher.WaitFor(ct.JobEvents{"web": {ct.JobStateUp: 1}}, scaleTimeout, nil)
	t.Assert(err, c.IsNil)

	// run a cluster update from the blobstore
	updateHost := releaseCluster.Instances[1]
	script.Reset()
	updateScript.Execute(&script, blobstore)
	var updateOutput bytes.Buffer
	out = io.MultiWriter(logWriter, &updateOutput)
	t.Assert(updateHost.Run("bash -ex", &tc.Streams{Stdin: &script, Stdout: out, Stderr: out}), c.IsNil)

	// check rebuilt images were downloaded
	for name := range versions {
//.........這裏部分代碼省略.........