Golang template.New函數代碼示例

// createContainer populates and configures the container type with the
// data provided by the execdriver.Command
func (d *driver) createContainer(c *execdriver.Command) (*libcontainer.Container, error) {
	container := template.New()

	container.Hostname = getEnv("HOSTNAME", c.Env)
	container.Tty = c.Tty
	container.User = c.User
	container.WorkingDir = c.WorkingDir
	container.Env = c.Env
	container.Cgroups.Name = c.ID
	// check to see if we are running in ramdisk to disable pivot root
	container.NoPivotRoot = os.Getenv("DOCKER_RAMDISK") != ""

	if err := d.createNetwork(container, c); err != nil {
		return nil, err
	}
	if c.Privileged {
		if err := d.setPrivileged(container); err != nil {
			return nil, err
		}
	}
	if err := d.setupCgroups(container, c); err != nil {
		return nil, err
	}
	if err := d.setupMounts(container, c); err != nil {
		return nil, err
	}
	if err := d.setupLabels(container, c); err != nil {
		return nil, err
	}
	if err := configuration.ParseConfiguration(container, d.activeContainers, c.Config["native"]); err != nil {
		return nil, err
	}
	return container, nil
}

// createContainer populates and configures the container type with the
// data provided by the execdriver.Command
func (d *driver) createContainer(c *execdriver.Command) (*libcontainer.Config, error) {
	container := template.New()

	container.Hostname = getEnv("HOSTNAME", c.Env)
	container.Tty = c.Tty
	container.User = c.User
	container.WorkingDir = c.WorkingDir
	container.Env = c.Env
	container.Cgroups.Name = c.ID
	container.Cgroups.AllowedDevices = c.AllowedDevices
	container.MountConfig.DeviceNodes = c.AutoCreatedDevices

	// check to see if we are running in ramdisk to disable pivot root
	container.MountConfig.NoPivotRoot = os.Getenv("DOCKER_RAMDISK") != ""
	container.RestrictSys = true

	if err := d.createNetwork(container, c); err != nil {
		return nil, err
	}

	if c.Privileged {
		if err := d.setPrivileged(container); err != nil {
			return nil, err
		}
	} else {
		if err := d.setCapabilities(container, c); err != nil {
			return nil, err
		}
	}

	if err := d.setupCgroups(container, c); err != nil {
		return nil, err
	}

	if err := d.setupMounts(container, c); err != nil {
		return nil, err
	}

	if err := d.setupLabels(container, c); err != nil {
		return nil, err
	}

	cmds := make(map[string]*exec.Cmd)
	d.Lock()
	for k, v := range d.activeContainers {
		cmds[k] = v.cmd
	}
	d.Unlock()

	if err := configuration.ParseConfiguration(container, cmds, c.Config["native"]); err != nil {
		return nil, err
	}

	return container, nil
}

func TestConfigurationsDoNotConflict(t *testing.T) {
	var (
		container1 = template.New()
		container2 = template.New()
		opts       = []string{
			"cap.add=NET_ADMIN",
		}
	)

	if err := ParseConfiguration(container1, nil, opts); err != nil {
		t.Fatal(err)
	}

	if !hasCapability("NET_ADMIN", container1.Capabilities) {
		t.Fatal("container one should have NET_ADMIN enabled")
	}
	if hasCapability("NET_ADMIN", container2.Capabilities) {
		t.Fatal("container two should not have NET_ADMIN enabled")
	}
}

func TestAppArmorProfile(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"apparmor_profile=koye-the-protector",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}
	if expected := "koye-the-protector"; container.Context["apparmor_profile"] != expected {
		t.Fatalf("expected profile %s got %s", expected, container.Context["apparmor_profile"])
	}
}

func TestCpuShares(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cgroups.cpu_shares=1048",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if expected := int64(1048); container.Cgroups.CpuShares != expected {
		t.Fatalf("expected cpu shares %d got %d", expected, container.Cgroups.CpuShares)
	}
}

func TestCpusetCpus(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cgroups.cpuset.cpus=1,2",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if expected := "1,2"; container.Cgroups.CpusetCpus != expected {
		t.Fatalf("expected %s got %s for cpuset.cpus", expected, container.Cgroups.CpusetCpus)
	}
}

func TestDropNamespace(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"ns.drop=NEWNET",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if container.Namespaces["NEWNET"] {
		t.Fatal("container should not have NEWNET enabled")
	}
}

func TestMemoryReservation(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cgroups.memory_reservation=500m",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if expected := int64(500 * 1024 * 1024); container.Cgroups.MemoryReservation != expected {
		t.Fatalf("expected memory reservation %d got %d", expected, container.Cgroups.MemoryReservation)
	}
}

func finalizeNamespace(args *execdriver.InitArgs) error {
	if err := utils.CloseExecFrom(3); err != nil {
		return err
	}

	// We use the native drivers default template so that things like caps are consistent
	// across both drivers
	container := template.New()

	if !args.Privileged {
		// drop capabilities in bounding set before changing user
		if err := capabilities.DropBoundingSet(container.Capabilities); err != nil {
			return fmt.Errorf("drop bounding set %s", err)
		}

		// preserve existing capabilities while we change users
		if err := system.SetKeepCaps(); err != nil {
			return fmt.Errorf("set keep caps %s", err)
		}
	}

	if err := namespaces.SetupUser(args.User); err != nil {
		return fmt.Errorf("setup user %s", err)
	}

	if !args.Privileged {
		if err := system.ClearKeepCaps(); err != nil {
			return fmt.Errorf("clear keep caps %s", err)
		}

		caps, err := execdriver.TweakCapabilities(container.Capabilities, strings.Split(args.CapAdd, " "), strings.Split(args.CapDrop, " "))
		if err != nil {
			return err
		}

		// drop all other capabilities
		if err := capabilities.DropCapabilities(caps); err != nil {
			return fmt.Errorf("drop capabilities %s", err)
		}
	}

	if err := setupWorkingDirectory(args); err != nil {
		return err
	}

	return nil
}

func TestDropCap(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cap.drop=MKNOD",
		}
	)
	// enabled all caps like in privileged mode
	container.Capabilities = libcontainer.GetAllCapabilities()
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if hasCapability("MKNOD", container.Capabilities) {
		t.Fatal("container should not have MKNOD enabled")
	}
}

func TestSetReadonlyRootFs(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"fs.readonly=true",
		}
	)

	if container.ReadonlyFs {
		t.Fatal("container should not have a readonly rootfs by default")
	}
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if !container.ReadonlyFs {
		t.Fatal("container should have a readonly rootfs")
	}
}

func TestAddCap(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cap.add=MKNOD",
			"cap.add=SYS_ADMIN",
		}
	)
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if !hasCapability("MKNOD", container.Capabilities) {
		t.Fatal("container should have MKNOD enabled")
	}
	if !hasCapability("SYS_ADMIN", container.Capabilities) {
		t.Fatal("container should have SYS_ADMIN enabled")
	}
}

func TestDropCap(t *testing.T) {
	var (
		container = template.New()
		opts      = []string{
			"cap.drop=MKNOD",
		}
	)
	// enabled all caps like in privileged mode
	for key := range container.CapabilitiesMask {
		container.CapabilitiesMask[key] = true
	}
	if err := ParseConfiguration(container, nil, opts); err != nil {
		t.Fatal(err)
	}

	if container.CapabilitiesMask["MKNOD"] {
		t.Fatal("container should not have MKNOD enabled")
	}
}