command.go

package amcs

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
)

func cmd(input string) error {
	var stdoutBuf, stderrBuf bytes.Buffer
	cmd := exec.Command("/bin/bash", "-c", input)
	stdoutIn, err := cmd.StdoutPipe()
	if err != nil {
		return err
	}
	stderrIn, err := cmd.StderrPipe()
	if err != nil {
		return err
	}
	var errStdout, errStderr error
	stdout := io.MultiWriter(os.Stdout, &stdoutBuf)
	stderr := io.MultiWriter(os.Stderr, &stderrBuf)
	err = cmd.Start()
	if err != nil {
		return err
	}
	go func() {
		_, errStdout = io.Copy(stdout, stdoutIn)
	}()
	go func() {
		_, errStderr = io.Copy(stderr, stderrIn)
	}()
	err = cmd.Wait()
	if err != nil {
		return err
	}
	if errStdout != nil || errStderr != nil {
		return errors.New(fmt.Sprintf("%s\n%s", errStdout.Error(), errStderr.Error()))
	}
	return nil
}