golang exec.Command读取标准输入 [英] golang exec.Command read std input

问题描述

我有一个可以调用ruby脚本的go程序.

I have a go program that should invoke a ruby script.

我有一个 runCommand 函数:

func runCommand(cmdName string, arg ...string) {
    cmd := exec.Command(cmdName, arg...)
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    cmd.Stdin = os.Stdin
    err = cmd.Run()
    if err != nil {
        fmt.Printf("Failed to start Ruby. %s\n", err.Error())
        os.Exit(1)
    }
}

我这样调用它:

runCommand("ruby", "-e", "require 'foo'")

它适用于大多数情况，除非子进程中有一个 gets 或任何类似的操作需要暂停以进行输入.

It works for most cases, except if there is a gets or any similar operation in the child process that needs to pause for an input.

我尝试设置 cmd.Stdin = os.Stdin ，但是它不等待输入.

I have tried setting cmd.Stdin = os.Stdin, but it does not wait for input.

我做错了什么?

推荐答案

以下程序似乎可以满足您的要求(我的 runCommand 与您的几乎相同.我只是更改了 =到:= 的 err 行.)您在做其他事情吗?

The following program seems do what you ask for (my runCommand is almost identical to yours. I just changed the = to := for the err line.) Are you doing something differently?

package main

import (
    "fmt"
    "os"
    "os/exec"
)

func main() {
    runCommand("ruby", "-e", `puts "Running"; $in = gets; puts "You said #{$in}"`)
}

func runCommand(cmdName string, arg ...string) {
    cmd := exec.Command(cmdName, arg...)
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    cmd.Stdin = os.Stdin
    err := cmd.Run()
    if err != nil {
        fmt.Printf("Failed to start Ruby. %s\n", err.Error())
        os.Exit(1)
    }
}

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