func addArgsFromEnv(evar string, args *[]string) {
	if e := os.Getenv(evar); e != "" {
		for _, f := range strings.Fields(e) {
			*args = append(*args, f)
		}
	}
	fmt.Printf(">>> criu %v\n", *args)
}
func addArgsFromEnv(evar string, args *[]string) {
	if e := os.Getenv(evar); e != "" {
		for _, f := range strings.Fields(e) {
			*args = append(*args, f)
		}
	}
	fmt.Printf(">>> criu %v\n", *args)
}
// XXX debug support, remove when debugging done.