func checkRancherMountVersion() error {
	cmdline := []string{"-V"}
	if err := util.CheckBinaryVersion(RANCHER_MOUNT_BINARY, RANCHER_MOUNT_MIN_VERSION, cmdline); err != nil {
		return err
	}
	return nil
}
func (d *Driver) CheckEnvironment() error {
	cmdline := []string{"thin_delta", "-V"}
	if err := util.CheckBinaryVersion(THIN_PROVISION_TOOLS_BINARY, THIN_PROVISION_TOOLS_MIN_VERSION, cmdline); err != nil {
		return err
	}
	return nil
}