package docker import ( "bytes" "fmt" "io" std_log "log" "net" "net/url" "os" "path/filepath" "runtime" "strconv" "strings" "syscall" "testing" "time" "github.com/docker/docker/daemon" "github.com/docker/docker/engine" "github.com/docker/docker/image" "github.com/docker/docker/nat" "github.com/docker/docker/pkg/ioutils" "github.com/docker/docker/pkg/log" "github.com/docker/docker/reexec" "github.com/docker/docker/runconfig" "github.com/docker/docker/utils" ) const ( unitTestImageName = "docker-test-image" unitTestImageID = "83599e29c455eb719f77d799bc7c51521b9551972f5a850d7ad265bc1b5292f6" // 1.0 unitTestImageIDShort = "83599e29c455" unitTestNetworkBridge = "testdockbr0" unitTestStoreBase = "/var/lib/docker/unit-tests" unitTestDockerTmpdir = "/var/lib/docker/tmp" testDaemonAddr = "127.0.0.1:4270" testDaemonProto = "tcp" testDaemonHttpsProto = "tcp" testDaemonHttpsAddr = "localhost:4271" testDaemonRogueHttpsAddr = "localhost:4272" ) var ( // FIXME: globalDaemon is deprecated by globalEngine. All tests should be converted. globalDaemon *daemon.Daemon globalEngine *engine.Engine globalHttpsEngine *engine.Engine globalRogueHttpsEngine *engine.Engine startFds int startGoroutines int ) // FIXME: nuke() is deprecated by Daemon.Nuke() func nuke(daemon *daemon.Daemon) error { return daemon.Nuke() } // FIXME: cleanup and nuke are redundant. func cleanup(eng *engine.Engine, t *testing.T) error { daemon := mkDaemonFromEngine(eng, t) for _, container := range daemon.List() { container.Kill() daemon.Destroy(container) } job := eng.Job("images") images, err := job.Stdout.AddTable() if err != nil { t.Fatal(err) } if err := job.Run(); err != nil { t.Fatal(err) } for _, image := range images.Data { if image.Get("Id") != unitTestImageID { eng.Job("image_delete", image.Get("Id")).Run() } } return nil } func layerArchive(tarfile string) (io.Reader, error) { // FIXME: need to close f somewhere f, err := os.Open(tarfile) if err != nil { return nil, err } return f, nil } func init() { // Always use the same driver (vfs) for all integration tests. // To test other drivers, we need a dedicated driver validation suite. os.Setenv("DOCKER_DRIVER", "vfs") os.Setenv("TEST", "1") os.Setenv("DOCKER_TMPDIR", unitTestDockerTmpdir) // Hack to run sys init during unit testing if reexec.Init() { return } if uid := syscall.Geteuid(); uid != 0 { log.Fatalf("docker tests need to be run as root") } // Copy dockerinit into our current testing directory, if provided (so we can test a separate dockerinit binary) if dockerinit := os.Getenv("TEST_DOCKERINIT_PATH"); dockerinit != "" { src, err := os.Open(dockerinit) if err != nil { log.Fatalf("Unable to open TEST_DOCKERINIT_PATH: %s", err) } defer src.Close() dst, err := os.OpenFile(filepath.Join(filepath.Dir(utils.SelfPath()), "dockerinit"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0555) if err != nil { log.Fatalf("Unable to create dockerinit in test directory: %s", err) } defer dst.Close() if _, err := io.Copy(dst, src); err != nil { log.Fatalf("Unable to copy dockerinit to TEST_DOCKERINIT_PATH: %s", err) } dst.Close() src.Close() } // Setup the base daemon, which will be duplicated for each test. // (no tests are run directly in the base) setupBaseImage() // Create the "global daemon" with a long-running daemons for integration tests spawnGlobalDaemon() spawnLegitHttpsDaemon() spawnRogueHttpsDaemon() startFds, startGoroutines = utils.GetTotalUsedFds(), runtime.NumGoroutine() } func setupBaseImage() { eng := newTestEngine(std_log.New(os.Stderr, "", 0), false, unitTestStoreBase) job := eng.Job("image_inspect", unitTestImageName) img, _ := job.Stdout.AddEnv() // If the unit test is not found, try to download it. if err := job.Run(); err != nil || img.Get("Id") != unitTestImageID { // Retrieve the Image job = eng.Job("pull", unitTestImageName) job.Stdout.Add(ioutils.NopWriteCloser(os.Stdout)) if err := job.Run(); err != nil { log.Fatalf("Unable to pull the test image: %s", err) } } } func spawnGlobalDaemon() { if globalDaemon != nil { log.Debugf("Global daemon already exists. Skipping.") return } t := std_log.New(os.Stderr, "", 0) eng := NewTestEngine(t) globalEngine = eng globalDaemon = mkDaemonFromEngine(eng, t) // Spawn a Daemon go func() { log.Debugf("Spawning global daemon for integration tests") listenURL := &url.URL{ Scheme: testDaemonProto, Host: testDaemonAddr, } job := eng.Job("serveapi", listenURL.String()) job.SetenvBool("Logging", true) if err := job.Run(); err != nil { log.Fatalf("Unable to spawn the test daemon: %s", err) } }() // Give some time to ListenAndServer to actually start // FIXME: use inmem transports instead of tcp time.Sleep(time.Second) if err := eng.Job("acceptconnections").Run(); err != nil { log.Fatalf("Unable to accept connections for test api: %s", err) } } func spawnLegitHttpsDaemon() { if globalHttpsEngine != nil { return } globalHttpsEngine = spawnHttpsDaemon(testDaemonHttpsAddr, "fixtures/https/ca.pem", "fixtures/https/server-cert.pem", "fixtures/https/server-key.pem") } func spawnRogueHttpsDaemon() { if globalRogueHttpsEngine != nil { return } globalRogueHttpsEngine = spawnHttpsDaemon(testDaemonRogueHttpsAddr, "fixtures/https/ca.pem", "fixtures/https/server-rogue-cert.pem", "fixtures/https/server-rogue-key.pem") } func spawnHttpsDaemon(addr, cacert, cert, key string) *engine.Engine { t := std_log.New(os.Stderr, "", 0) root, err := newTestDirectory(unitTestStoreBase) if err != nil { t.Fatal(err) } // FIXME: here we don't use NewTestEngine because it configures the daemon with Autorestart=false, // and we want to set it to true. eng := newTestEngine(t, true, root) // Spawn a Daemon go func() { log.Debugf("Spawning https daemon for integration tests") listenURL := &url.URL{ Scheme: testDaemonHttpsProto, Host: addr, } job := eng.Job("serveapi", listenURL.String()) job.SetenvBool("Logging", true) job.SetenvBool("Tls", true) job.SetenvBool("TlsVerify", true) job.Setenv("TlsCa", cacert) job.Setenv("TlsCert", cert) job.Setenv("TlsKey", key) if err := job.Run(); err != nil { log.Fatalf("Unable to spawn the test daemon: %s", err) } }() // Give some time to ListenAndServer to actually start time.Sleep(time.Second) if err := eng.Job("acceptconnections").Run(); err != nil { log.Fatalf("Unable to accept connections for test api: %s", err) } return eng } // FIXME: test that ImagePull(json=true) send correct json output func GetTestImage(daemon *daemon.Daemon) *image.Image { imgs, err := daemon.Graph().Map() if err != nil { log.Fatalf("Unable to get the test image: %s", err) } for _, image := range imgs { if image.ID == unitTestImageID { return image } } log.Fatalf("Test image %v not found in %s: %s", unitTestImageID, daemon.Graph().Root, imgs) return nil } func TestDaemonCreate(t *testing.T) { daemon := mkDaemon(t) defer nuke(daemon) // Make sure we start we 0 containers if len(daemon.List()) != 0 { t.Errorf("Expected 0 containers, %v found", len(daemon.List())) } container, _, err := daemon.Create(&runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}, }, &runconfig.HostConfig{}, "", ) if err != nil { t.Fatal(err) } defer func() { if err := daemon.Destroy(container); err != nil { t.Error(err) } }() // Make sure we can find the newly created container with List() if len(daemon.List()) != 1 { t.Errorf("Expected 1 container, %v found", len(daemon.List())) } // Make sure the container List() returns is the right one if daemon.List()[0].ID != container.ID { t.Errorf("Unexpected container %v returned by List", daemon.List()[0]) } // Make sure we can get the container with Get() if daemon.Get(container.ID) == nil { t.Errorf("Unable to get newly created container") } // Make sure it is the right container if daemon.Get(container.ID) != container { t.Errorf("Get() returned the wrong container") } // Make sure Exists returns it as existing if !daemon.Exists(container.ID) { t.Errorf("Exists() returned false for a newly created container") } // Test that conflict error displays correct details testContainer, _, _ := daemon.Create( &runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}, }, &runconfig.HostConfig{}, "conflictname", ) if _, _, err := daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}}, &runconfig.HostConfig{}, testContainer.Name); err == nil || !strings.Contains(err.Error(), utils.TruncateID(testContainer.ID)) { t.Fatalf("Name conflict error doesn't include the correct short id. Message was: %s", err.Error()) } // Make sure create with bad parameters returns an error if _, _, err = daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID}, &runconfig.HostConfig{}, ""); err == nil { t.Fatal("Builder.Create should throw an error when Cmd is missing") } if _, _, err := daemon.Create( &runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{}, }, &runconfig.HostConfig{}, "", ); err == nil { t.Fatal("Builder.Create should throw an error when Cmd is empty") } config := &runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"/bin/ls"}, PortSpecs: []string{"80"}, } container, _, err = daemon.Create(config, &runconfig.HostConfig{}, "") _, err = daemon.Commit(container, "testrepo", "testtag", "", "", true, config) if err != nil { t.Error(err) } // test expose 80:8000 container, warnings, err := daemon.Create(&runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}, PortSpecs: []string{"80:8000"}, }, &runconfig.HostConfig{}, "", ) if err != nil { t.Fatal(err) } if warnings == nil || len(warnings) != 1 { t.Error("Expected a warning, got none") } } func TestDestroy(t *testing.T) { daemon := mkDaemon(t) defer nuke(daemon) container, _, err := daemon.Create(&runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}, }, &runconfig.HostConfig{}, "") if err != nil { t.Fatal(err) } // Destroy if err := daemon.Destroy(container); err != nil { t.Error(err) } // Make sure daemon.Exists() behaves correctly if daemon.Exists("test_destroy") { t.Errorf("Exists() returned true") } // Make sure daemon.List() doesn't list the destroyed container if len(daemon.List()) != 0 { t.Errorf("Expected 0 container, %v found", len(daemon.List())) } // Make sure daemon.Get() refuses to return the unexisting container if daemon.Get(container.ID) != nil { t.Errorf("Unable to get newly created container") } // Test double destroy if err := daemon.Destroy(container); err == nil { // It should have failed t.Errorf("Double destroy did not fail") } } func TestGet(t *testing.T) { daemon := mkDaemon(t) defer nuke(daemon) container1, _, _ := mkContainer(daemon, []string{"_", "ls", "-al"}, t) defer daemon.Destroy(container1) container2, _, _ := mkContainer(daemon, []string{"_", "ls", "-al"}, t) defer daemon.Destroy(container2) container3, _, _ := mkContainer(daemon, []string{"_", "ls", "-al"}, t) defer daemon.Destroy(container3) if daemon.Get(container1.ID) != container1 { t.Errorf("Get(test1) returned %v while expecting %v", daemon.Get(container1.ID), container1) } if daemon.Get(container2.ID) != container2 { t.Errorf("Get(test2) returned %v while expecting %v", daemon.Get(container2.ID), container2) } if daemon.Get(container3.ID) != container3 { t.Errorf("Get(test3) returned %v while expecting %v", daemon.Get(container3.ID), container3) } } func startEchoServerContainer(t *testing.T, proto string) (*daemon.Daemon, *daemon.Container, string) { var ( err error id string outputBuffer = bytes.NewBuffer(nil) strPort string eng = NewTestEngine(t) daemon = mkDaemonFromEngine(eng, t) port = 5554 p nat.Port ) defer func() { if err != nil { daemon.Nuke() } }() for { port += 1 strPort = strconv.Itoa(port) var cmd string if proto == "tcp" { cmd = "socat TCP-LISTEN:" + strPort + ",reuseaddr,fork EXEC:/bin/cat" } else if proto == "udp" { cmd = "socat UDP-RECVFROM:" + strPort + ",fork EXEC:/bin/cat" } else { t.Fatal(fmt.Errorf("Unknown protocol %v", proto)) } ep := make(map[nat.Port]struct{}, 1) p = nat.Port(fmt.Sprintf("%s/%s", strPort, proto)) ep[p] = struct{}{} jobCreate := eng.Job("create") jobCreate.Setenv("Image", unitTestImageID) jobCreate.SetenvList("Cmd", []string{"sh", "-c", cmd}) jobCreate.SetenvList("PortSpecs", []string{fmt.Sprintf("%s/%s", strPort, proto)}) jobCreate.SetenvJson("ExposedPorts", ep) jobCreate.Stdout.Add(outputBuffer) if err := jobCreate.Run(); err != nil { t.Fatal(err) } id = engine.Tail(outputBuffer, 1) // FIXME: this relies on the undocumented behavior of daemon.Create // which will return a nil error AND container if the exposed ports // are invalid. That behavior should be fixed! if id != "" { break } t.Logf("Port %v already in use, trying another one", strPort) } jobStart := eng.Job("start", id) portBindings := make(map[nat.Port][]nat.PortBinding) portBindings[p] = []nat.PortBinding{ {}, } if err := jobStart.SetenvJson("PortsBindings", portBindings); err != nil { t.Fatal(err) } if err := jobStart.Run(); err != nil { t.Fatal(err) } container := daemon.Get(id) if container == nil { t.Fatalf("Couldn't fetch test container %s", id) } setTimeout(t, "Waiting for the container to be started timed out", 2*time.Second, func() { for !container.IsRunning() { time.Sleep(10 * time.Millisecond) } }) // Even if the state is running, lets give some time to lxc to spawn the process container.WaitStop(500 * time.Millisecond) strPort = container.NetworkSettings.Ports[p][0].HostPort return daemon, container, strPort } // Run a container with a TCP port allocated, and test that it can receive connections on localhost func TestAllocateTCPPortLocalhost(t *testing.T) { daemon, container, port := startEchoServerContainer(t, "tcp") defer nuke(daemon) defer container.Kill() for i := 0; i != 10; i++ { conn, err := net.Dial("tcp", fmt.Sprintf("localhost:%v", port)) if err != nil { t.Fatal(err) } defer conn.Close() input := bytes.NewBufferString("well hello there\n") _, err = conn.Write(input.Bytes()) if err != nil { t.Fatal(err) } buf := make([]byte, 16) read := 0 conn.SetReadDeadline(time.Now().Add(3 * time.Second)) read, err = conn.Read(buf) if err != nil { if err, ok := err.(*net.OpError); ok { if err.Err == syscall.ECONNRESET { t.Logf("Connection reset by the proxy, socat is probably not listening yet, trying again in a sec") conn.Close() time.Sleep(time.Second) continue } if err.Timeout() { t.Log("Timeout, trying again") conn.Close() continue } } t.Fatal(err) } output := string(buf[:read]) if !strings.Contains(output, "well hello there") { t.Fatal(fmt.Errorf("[%v] doesn't contain [well hello there]", output)) } else { return } } t.Fatal("No reply from the container") } // Run a container with an UDP port allocated, and test that it can receive connections on localhost func TestAllocateUDPPortLocalhost(t *testing.T) { daemon, container, port := startEchoServerContainer(t, "udp") defer nuke(daemon) defer container.Kill() conn, err := net.Dial("udp", fmt.Sprintf("localhost:%v", port)) if err != nil { t.Fatal(err) } defer conn.Close() input := bytes.NewBufferString("well hello there\n") buf := make([]byte, 16) // Try for a minute, for some reason the select in socat may take ages // to return even though everything on the path seems fine (i.e: the // UDPProxy forwards the traffic correctly and you can see the packets // on the interface from within the container). for i := 0; i != 120; i++ { _, err := conn.Write(input.Bytes()) if err != nil { t.Fatal(err) } conn.SetReadDeadline(time.Now().Add(500 * time.Millisecond)) read, err := conn.Read(buf) if err == nil { output := string(buf[:read]) if strings.Contains(output, "well hello there") { return } } } t.Fatal("No reply from the container") } func TestRestore(t *testing.T) { eng := NewTestEngine(t) daemon1 := mkDaemonFromEngine(eng, t) defer daemon1.Nuke() // Create a container with one instance of docker container1, _, _ := mkContainer(daemon1, []string{"_", "ls", "-al"}, t) defer daemon1.Destroy(container1) // Create a second container meant to be killed container2, _, _ := mkContainer(daemon1, []string{"-i", "_", "/bin/cat"}, t) defer daemon1.Destroy(container2) // Start the container non blocking if err := container2.Start(); err != nil { t.Fatal(err) } if !container2.IsRunning() { t.Fatalf("Container %v should appear as running but isn't", container2.ID) } // Simulate a crash/manual quit of dockerd: process dies, states stays 'Running' cStdin, _ := container2.StdinPipe() cStdin.Close() if _, err := container2.WaitStop(2 * time.Second); err != nil { t.Fatal(err) } container2.SetRunning(42) container2.ToDisk() if len(daemon1.List()) != 2 { t.Errorf("Expected 2 container, %v found", len(daemon1.List())) } if err := container1.Run(); err != nil { t.Fatal(err) } if !container2.IsRunning() { t.Fatalf("Container %v should appear as running but isn't", container2.ID) } // Here are are simulating a docker restart - that is, reloading all containers // from scratch eng = newTestEngine(t, false, daemon1.Config().Root) daemon2 := mkDaemonFromEngine(eng, t) if len(daemon2.List()) != 2 { t.Errorf("Expected 2 container, %v found", len(daemon2.List())) } runningCount := 0 for _, c := range daemon2.List() { if c.IsRunning() { t.Errorf("Running container found: %v (%v)", c.ID, c.Path) runningCount++ } } if runningCount != 0 { t.Fatalf("Expected 0 container alive, %d found", runningCount) } container3 := daemon2.Get(container1.ID) if container3 == nil { t.Fatal("Unable to Get container") } if err := container3.Run(); err != nil { t.Fatal(err) } container2.SetStopped(0) } func TestDefaultContainerName(t *testing.T) { eng := NewTestEngine(t) daemon := mkDaemonFromEngine(eng, t) defer nuke(daemon) config, _, _, err := parseRun([]string{unitTestImageID, "echo test"}, nil) if err != nil { t.Fatal(err) } container := daemon.Get(createNamedTestContainer(eng, config, t, "some_name")) containerID := container.ID if container.Name != "/some_name" { t.Fatalf("Expect /some_name got %s", container.Name) } if c := daemon.Get("/some_name"); c == nil { t.Fatalf("Couldn't retrieve test container as /some_name") } else if c.ID != containerID { t.Fatalf("Container /some_name has ID %s instead of %s", c.ID, containerID) } } func TestRandomContainerName(t *testing.T) { eng := NewTestEngine(t) daemon := mkDaemonFromEngine(eng, t) defer nuke(daemon) config, _, _, err := parseRun([]string{GetTestImage(daemon).ID, "echo test"}, nil) if err != nil { t.Fatal(err) } container := daemon.Get(createTestContainer(eng, config, t)) containerID := container.ID if container.Name == "" { t.Fatalf("Expected not empty container name") } if c := daemon.Get(container.Name); c == nil { log.Fatalf("Could not lookup container %s by its name", container.Name) } else if c.ID != containerID { log.Fatalf("Looking up container name %s returned id %s instead of %s", container.Name, c.ID, containerID) } } func TestContainerNameValidation(t *testing.T) { eng := NewTestEngine(t) daemon := mkDaemonFromEngine(eng, t) defer nuke(daemon) for _, test := range []struct { Name string Valid bool }{ {"abc-123_AAA.1", true}, {"\000asdf", false}, } { config, _, _, err := parseRun([]string{unitTestImageID, "echo test"}, nil) if err != nil { if !test.Valid { continue } t.Fatal(err) } var outputBuffer = bytes.NewBuffer(nil) job := eng.Job("create", test.Name) if err := job.ImportEnv(config); err != nil { t.Fatal(err) } job.Stdout.Add(outputBuffer) if err := job.Run(); err != nil { if !test.Valid { continue } t.Fatal(err) } container := daemon.Get(engine.Tail(outputBuffer, 1)) if container.Name != "/"+test.Name { t.Fatalf("Expect /%s got %s", test.Name, container.Name) } if c := daemon.Get("/" + test.Name); c == nil { t.Fatalf("Couldn't retrieve test container as /%s", test.Name) } else if c.ID != container.ID { t.Fatalf("Container /%s has ID %s instead of %s", test.Name, c.ID, container.ID) } } } func TestLinkChildContainer(t *testing.T) { eng := NewTestEngine(t) daemon := mkDaemonFromEngine(eng, t) defer nuke(daemon) config, _, _, err := parseRun([]string{unitTestImageID, "echo test"}, nil) if err != nil { t.Fatal(err) } container := daemon.Get(createNamedTestContainer(eng, config, t, "/webapp")) webapp, err := daemon.GetByName("/webapp") if err != nil { t.Fatal(err) } if webapp.ID != container.ID { t.Fatalf("Expect webapp id to match container id: %s != %s", webapp.ID, container.ID) } config, _, _, err = parseRun([]string{GetTestImage(daemon).ID, "echo test"}, nil) if err != nil { t.Fatal(err) } childContainer := daemon.Get(createTestContainer(eng, config, t)) if err := daemon.RegisterLink(webapp, childContainer, "db"); err != nil { t.Fatal(err) } // Get the child by it's new name db, err := daemon.GetByName("/webapp/db") if err != nil { t.Fatal(err) } if db.ID != childContainer.ID { t.Fatalf("Expect db id to match container id: %s != %s", db.ID, childContainer.ID) } } func TestGetAllChildren(t *testing.T) { eng := NewTestEngine(t) daemon := mkDaemonFromEngine(eng, t) defer nuke(daemon) config, _, _, err := parseRun([]string{unitTestImageID, "echo test"}, nil) if err != nil { t.Fatal(err) } container := daemon.Get(createNamedTestContainer(eng, config, t, "/webapp")) webapp, err := daemon.GetByName("/webapp") if err != nil { t.Fatal(err) } if webapp.ID != container.ID { t.Fatalf("Expect webapp id to match container id: %s != %s", webapp.ID, container.ID) } config, _, _, err = parseRun([]string{unitTestImageID, "echo test"}, nil) if err != nil { t.Fatal(err) } childContainer := daemon.Get(createTestContainer(eng, config, t)) if err := daemon.RegisterLink(webapp, childContainer, "db"); err != nil { t.Fatal(err) } children, err := daemon.Children("/webapp") if err != nil { t.Fatal(err) } if children == nil { t.Fatal("Children should not be nil") } if len(children) == 0 { t.Fatal("Children should not be empty") } for key, value := range children { if key != "/webapp/db" { t.Fatalf("Expected /webapp/db got %s", key) } if value.ID != childContainer.ID { t.Fatalf("Expected id %s got %s", childContainer.ID, value.ID) } } } func TestDestroyWithInitLayer(t *testing.T) { daemon := mkDaemon(t) defer nuke(daemon) container, _, err := daemon.Create(&runconfig.Config{ Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}, }, &runconfig.HostConfig{}, "") if err != nil { t.Fatal(err) } // Destroy if err := daemon.Destroy(container); err != nil { t.Fatal(err) } // Make sure daemon.Exists() behaves correctly if daemon.Exists("test_destroy") { t.Fatalf("Exists() returned true") } // Make sure daemon.List() doesn't list the destroyed container if len(daemon.List()) != 0 { t.Fatalf("Expected 0 container, %v found", len(daemon.List())) } driver := daemon.Graph().Driver() // Make sure that the container does not exist in the driver if _, err := driver.Get(container.ID, ""); err == nil { t.Fatal("Conttainer should not exist in the driver") } // Make sure that the init layer is removed from the driver if _, err := driver.Get(fmt.Sprintf("%s-init", container.ID), ""); err == nil { t.Fatal("Container's init layer should not exist in the driver") } }