Ensure that state always contains pathes to all namespaces

Thanks coolljit0725 for initial fix.

Closes #512

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

configs/namespaces.go

@@ -16,6 +16,17 @@ const (
 	NEWUSER NamespaceType = "NEWUSER"
 )
 
+func NamespaceTypes() []NamespaceType {
+	return []NamespaceType{
+		NEWNET,
+		NEWPID,
+		NEWNS,
+		NEWUTS,
+		NEWIPC,
+		NEWUSER,
+	}
+}
+
 // Namespace defines configuration for each namespace.  It specifies an
 // alternate path that is able to be joined via setns.
 type Namespace struct {

container_linux.go

@@ -306,5 +306,11 @@ func (c *linuxContainer) currentState() (*State, error) {
 	for _, ns := range c.config.Namespaces {
 		state.NamespacePaths[ns.Type] = ns.GetPath(c.initProcess.pid())
 	}
+	for _, nsType := range configs.NamespaceTypes() {
+		if _, ok := state.NamespacePaths[nsType]; !ok {
+			ns := configs.Namespace{Type: nsType}
+			state.NamespacePaths[ns.Type] = ns.GetPath(c.initProcess.pid())
+		}
+	}
 	return state, nil
 }

container_linux_test.go

@@ -130,7 +130,8 @@ func TestGetContainerState(t *testing.T) {
 				{Type: configs.NEWNS},
 				{Type: configs.NEWNET, Path: expectedNetworkPath},
 				{Type: configs.NEWUTS},
-				{Type: configs.NEWIPC},
+				// emulate host for IPC
+				//{Type: configs.NEWIPC},
 			},
 		},
 		initProcess: &mockProcess{

integration/exec_test.go

@@ -574,3 +574,77 @@ func testFreeze(t *testing.T, systemd bool) {
 		t.Fatal(s.String())
 	}
 }
+
+func TestContainerState(t *testing.T) {
+	if testing.Short() {
+		return
+	}
+	root, err := newTestRoot()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(root)
+
+	rootfs, err := newRootfs()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer remove(rootfs)
+
+	l, err := os.Readlink("/proc/1/ns/ipc")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	config := newTemplateConfig(rootfs)
+	config.Namespaces = configs.Namespaces([]configs.Namespace{
+		{Type: configs.NEWNS},
+		{Type: configs.NEWUTS},
+		// host for IPC
+		//{Type: configs.NEWIPC},
+		{Type: configs.NEWPID},
+		{Type: configs.NEWNET},
+	})
+
+	factory, err := libcontainer.New(root, libcontainer.Cgroupfs)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	container, err := factory.Create("test", config)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer container.Destroy()
+
+	stdinR, stdinW, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	p := &libcontainer.Process{
+		Args:  []string{"cat"},
+		Env:   standardEnvironment,
+		Stdin: stdinR,
+	}
+	err = container.Start(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	stdinR.Close()
+	defer p.Signal(os.Kill)
+
+	st, err := container.State()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	l1, err := os.Readlink(st.NamespacePaths[configs.NEWIPC])
+	if err != nil {
+		t.Fatal(err)
+	}
+	if l1 != l {
+		t.Fatal("Container using non-host ipc namespace")
+	}
+	stdinW.Close()
+	p.Wait()
+}