golang 执行命令行

golanggit cloneexec.Command

func RunCommand(path, name string, arg ...string) (msg string, err error) {
	cmd := exec.Command(name, arg...)
	cmd.Dir = path
	err = cmd.Run()
	log.Println(cmd.Args)
	if err != nil {
		log.Println("err", err.Error(), "cmd", cmd.Args)
	}
	return
}

这种写法是没有问题，但是一旦执行出错返回值过于简洁了，比如

func main() {
	msg, err := common.RunCommand("./", "/bin/bash", "-c", "git clone url")
	if err != nil {
		log.Fatal(err)
		return
	}
	log.Println(msg)
}

exit status 128

func RunCommand(path, name string, arg ...string) (msg string, err error) {
	cmd := exec.Command(name, arg...)
	var out bytes.Buffer
	var stderr bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &stderr
	cmd.Dir = path
	err = cmd.Run()
	log.Println(cmd.Args)
	if err != nil {
		msg = fmt.Sprint(err) + ": " + stderr.String()
		err = errors.New(msg)
		log.Println("err", err.Error(), "cmd", cmd.Args)
	}
	log.Println(out.String())
	return
}

再次执行，返回

2022/04/03 20:33:49 [/bin/bash -c git clone url]
2022/04/03 20:33:49 err exit status 128: fatal: repository 'url' does not exist
 cmd [/bin/bash -c git clone url]
2022/04/03 20:33:49 
2022/04/03 20:33:49 exit status 128: fatal: repository 'url' does not exist

repository 'url' does not exist

StdoutStderrStdoutStderr