func Exec(name string, args ...string) error {
 cmd := exec.Command(name, args...)
 stderr, _ := cmd.StderrPipe()
 stdout, _ := cmd.StdoutPipe()
 if err := cmd.Start(); err != nil {
 log.Println("exec the cmd ", name, " failed")
 return err
 }
 // 正常日志
 logScan := bufio.NewScanner(stdout)
 go func() {
 for logScan.Scan() {
  log.Println(logScan.Text())
 }
 }()
 // 错误日志
 errBuf := bytes.NewBufferString("")
 scan := bufio.NewScanner(stderr)
 for scan.Scan() {
 s := scan.Text()
 log.Println("build error: ", s)
 errBuf.WriteString(s)
 errBuf.WriteString("\n")
 }
 // 等待命令执行完
 cmd.Wait()
 if !cmd.ProcessState.Success() {
 // 执行失败，返回错误信息
 return errors.New(errBuf.String())
 }
 return nil
}