[Go] Sudo execution

main.go

package main

import (
	"bytes"
	"io"
	"log"
	"os/exec"
	"strings"
	"sync"
	"time"
)

func main() {
	output := bytes.Buffer{}
	stderr := bytes.Buffer{}
	process := exec.Command("sudo", "-S", "ls", "-la")

	process.Stdout = &output
	process.Stderr = &stderr
	// process.Stdin = strings.NewReader("YOUR PASSWORD HERE")

	stdin, err := process.StdinPipe()
	if err != nil {
		log.Fatal(err)
	}

	var wg sync.WaitGroup
	done := make(chan struct{}, 1)
	wg.Add(1)
	go func() {
		timer := time.NewTicker(time.Second)
		for {
			select {
			case <-done:
				log.Print("Finished:", output.String())
				wg.Done()
				return
			case <-timer.C:
				log.Print("[Stderr]:", stderr.String(), "\n")

				if strings.Contains(stderr.String(), "Password") {
					io.WriteString(stdin, "YOUR PASSWORD HERE\n")
				}
			}
		}
	}()

	if err := process.Start(); err != nil {
		log.Fatal(err)
	}

	if err := process.Wait(); err != nil {
		log.Print("Error:", err)
	}

	done <- struct{}{}

	log.Print("Waiting for goroutine finish\n")

	wg.Wait()
}