GetCommandResult.go

// https://www.reddit.com/r/golang/comments/1hvvnn/any_better_way_to_do_a_crossplatform_exec_and/

func GetCommandResult(cmd *exec.Cmd) ([]byte, int, error) {
	output, err := cmd.CombinedOutput()
	if err != nil {
		if e2, ok := err.(*exec.ExitError); ok {
			if status, ok := e2.Sys().(syscall.WaitStatus); ok && runtime.GOOS == "windows" {
				s := reflect.ValueOf(&status).Elem()
				for i := 0; i < s.NumField(); i++ {
					if s.Type().Field(i).Name == "ExitCode" {
						// win32
						if exitCode, ok := s.Field(i).Interface().(int); ok {
							return output, exitCode, nil
						}
					}
				}
			} else {
				// Linux/everything else
				match := regexp.MustCompile(`exit status (\d+)`).FindStringSubmatch(err.Error())
				if len(match) == 0 {
					panic("exotic operating system detected. ABORT! ABORT!")
				}
				exitCode, _ := strconv.Atoi(match[1])
				return output, exitCode, nil
			}
		}
		fmt.Println(err)
	}
	return output, 0, nil
}