func getBindOptions(mode []string) *mount.BindOptions {
	for _, item := range mode {
		for _, propagation := range mount.Propagations {
			if mount.Propagation(item) == propagation {
				return &mount.BindOptions{Propagation: mount.Propagation(item)}
			}
		}
	}
	return nil
}

// ValidMountMode will make sure the mount mode is valid.
// returns if it's a valid mount mode or not.
func ValidMountMode(mode string) bool {
	rwModeCount := 0
	labelModeCount := 0
	propagationModeCount := 0
	copyModeCount := 0

	for _, o := range strings.Split(mode, ",") {
		switch {
		case rwModes[o]:
			rwModeCount++
		case labelModes[o]:
			labelModeCount++
		case propagationModes[mounttypes.Propagation(o)]:
			propagationModeCount++
		case copyModeExists(o):
			copyModeCount++
		default:
			return false
		}
	}

	// Only one string for each mode is allowed.
	if rwModeCount > 1 || labelModeCount > 1 || propagationModeCount > 1 || copyModeCount > 1 {
		return false
	}
	return true
}

func getBindOptions(mode []string) *mount.BindOptions {
	for _, item := range mode {
		if strings.Contains(item, "private") || strings.Contains(item, "shared") || strings.Contains(item, "slave") {
			return &mount.BindOptions{Propagation: mount.Propagation(item)}
		}
	}
	return nil
}

// HasPropagation checks if there is a valid propagation mode present in
// passed string. Returns true if a valid propagation mode specifier is
// present, false otherwise.
func HasPropagation(mode string) bool {
	for _, o := range strings.Split(mode, ",") {
		if propagationModes[mounttypes.Propagation(o)] {
			return true
		}
	}
	return false
}

// GetPropagation extracts and returns the mount propagation mode. If there
// are no specifications, then by default it is "private".
func GetPropagation(mode string) mounttypes.Propagation {
	for _, o := range strings.Split(mode, ",") {
		prop := mounttypes.Propagation(o)
		if propagationModes[prop] {
			return prop
		}
	}
	return DefaultPropagationMode
}

func containerSpecFromGRPC(c *swarmapi.ContainerSpec) types.ContainerSpec {
	containerSpec := types.ContainerSpec{
		Image:    c.Image,
		Labels:   c.Labels,
		Command:  c.Command,
		Args:     c.Args,
		Hostname: c.Hostname,
		Env:      c.Env,
		Dir:      c.Dir,
		User:     c.User,
		Groups:   c.Groups,
		TTY:      c.TTY,
	}

	// Mounts
	for _, m := range c.Mounts {
		mount := mounttypes.Mount{
			Target:   m.Target,
			Source:   m.Source,
			Type:     mounttypes.Type(strings.ToLower(swarmapi.Mount_MountType_name[int32(m.Type)])),
			ReadOnly: m.ReadOnly,
		}

		if m.BindOptions != nil {
			mount.BindOptions = &mounttypes.BindOptions{
				Propagation: mounttypes.Propagation(strings.ToLower(swarmapi.Mount_BindOptions_MountPropagation_name[int32(m.BindOptions.Propagation)])),
			}
		}

		if m.VolumeOptions != nil {
			mount.VolumeOptions = &mounttypes.VolumeOptions{
				NoCopy: m.VolumeOptions.NoCopy,
				Labels: m.VolumeOptions.Labels,
			}
			if m.VolumeOptions.DriverConfig != nil {
				mount.VolumeOptions.DriverConfig = &mounttypes.Driver{
					Name:    m.VolumeOptions.DriverConfig.Name,
					Options: m.VolumeOptions.DriverConfig.Options,
				}
			}
		}
		containerSpec.Mounts = append(containerSpec.Mounts, mount)
	}

	if c.StopGracePeriod != nil {
		grace, _ := ptypes.Duration(c.StopGracePeriod)
		containerSpec.StopGracePeriod = &grace
	}

	if c.Healthcheck != nil {
		containerSpec.Healthcheck = healthConfigFromGRPC(c.Healthcheck)
	}

	return containerSpec
}

// Set a new mount value
func (m *MountOpt) Set(value string) error {
	csvReader := csv.NewReader(strings.NewReader(value))
	fields, err := csvReader.Read()
	if err != nil {
		return err
	}

	mount := mounttypes.Mount{}

	volumeOptions := func() *mounttypes.VolumeOptions {
		if mount.VolumeOptions == nil {
			mount.VolumeOptions = &mounttypes.VolumeOptions{
				Labels: make(map[string]string),
			}
		}
		if mount.VolumeOptions.DriverConfig == nil {
			mount.VolumeOptions.DriverConfig = &mounttypes.Driver{}
		}
		return mount.VolumeOptions
	}

	bindOptions := func() *mounttypes.BindOptions {
		if mount.BindOptions == nil {
			mount.BindOptions = new(mounttypes.BindOptions)
		}
		return mount.BindOptions
	}

	setValueOnMap := func(target map[string]string, value string) {
		parts := strings.SplitN(value, "=", 2)
		if len(parts) == 1 {
			target[value] = ""
		} else {
			target[parts[0]] = parts[1]
		}
	}

	mount.Type = mounttypes.TypeVolume // default to volume mounts
	// Set writable as the default
	for _, field := range fields {
		parts := strings.SplitN(field, "=", 2)
		key := strings.ToLower(parts[0])

		if len(parts) == 1 {
			switch key {
			case "readonly", "ro":
				mount.ReadOnly = true
				continue
			case "volume-nocopy":
				volumeOptions().NoCopy = true
				continue
			}
		}

		if len(parts) != 2 {
			return fmt.Errorf("invalid field '%s' must be a key=value pair", field)
		}

		value := parts[1]
		switch key {
		case "type":
			mount.Type = mounttypes.Type(strings.ToLower(value))
		case "source", "src":
			mount.Source = value
		case "target", "dst", "destination":
			mount.Target = value
		case "readonly", "ro":
			mount.ReadOnly, err = strconv.ParseBool(value)
			if err != nil {
				return fmt.Errorf("invalid value for %s: %s", key, value)
			}
		case "bind-propagation":
			bindOptions().Propagation = mounttypes.Propagation(strings.ToLower(value))
		case "volume-nocopy":
			volumeOptions().NoCopy, err = strconv.ParseBool(value)
			if err != nil {
				return fmt.Errorf("invalid value for populate: %s", value)
			}
		case "volume-label":
			setValueOnMap(volumeOptions().Labels, value)
		case "volume-driver":
			volumeOptions().DriverConfig.Name = value
		case "volume-opt":
			if volumeOptions().DriverConfig.Options == nil {
				volumeOptions().DriverConfig.Options = make(map[string]string)
			}
			setValueOnMap(volumeOptions().DriverConfig.Options, value)
		default:
			return fmt.Errorf("unexpected key '%s' in '%s'", key, field)
		}
	}

	if mount.Type == "" {
		return fmt.Errorf("type is required")
	}

	if mount.Target == "" {
		return fmt.Errorf("target is required")
	}
//.........这里部分代码省略.........