Function ParseDevice

pkg/cmd/container/run_cgroup_linux.go:269–301

ParseDevice parses the give device string into hostDevPath, containerPath and mode(defaults: "rwm").

(s string)

// ParseDevice parses the give device string into hostDevPath, containerPath and mode(defaults: "rwm").
func ParseDevice(s string) (hostDevPath string, containerPath string, mode string, err error) {
	mode = "rwm"
	split := strings.Split(s, ":")
	var containerDevPath string
	switch len(split) {
	case 1: // e.g. "/dev/sda1"
		hostDevPath = split[0]
		containerDevPath = hostDevPath
	case 2: // e.g., "/dev/sda1:rwm", or "/dev/sda1:/dev/sda1
		hostDevPath = split[0]
		if !strings.Contains(split[1], "/") {
			containerDevPath = hostDevPath
			mode = split[1]
		} else {
			containerDevPath = split[1]
		}
	case 3: // e.g., "/dev/sda1:/dev/sda1:rwm"
		hostDevPath = split[0]
		containerDevPath = split[1]
		mode = split[2]
	default:
		return "", "", "", errors.New("too many `:` symbols")
	}

	if !filepath.IsAbs(hostDevPath) {
		return "", "", "", fmt.Errorf("%q is not an absolute path", hostDevPath)
	}

	if err := validateDeviceMode(mode); err != nil {
		return "", "", "", err
	}
	return hostDevPath, containerDevPath, mode, nil
}

func validateDeviceMode(mode string) error {
	for _, r := range mode {