PackageManager/Helper/CheckRoot.go

package Helper

import (
	"errors"
	"os/exec"
	"strconv"
)

func CheckRoot() error {
	var (
		cmd    *exec.Cmd
		output []byte
		i      int
		e      error
	)

	// TODO Make cross platform

	cmd = exec.Command("id", "-u")
	output, e = cmd.Output()

	if e != nil {
		return e
	}

	// output has trailing \n
	// need to remove the \n
	// otherwise it will cause error for strconv.Atoi
	// log.Println(output[:len(output)-1])

	// 0 = root, 501 = non-root user
	i, e = strconv.Atoi(string(output[:len(output)-1]))
	if e != nil {
		return e
	}

	if i != 0 {
		return errors.New("Please run as root")
	}

	return nil
}