os.go

package utils

import (
	"bytes"
	"log"
	"os"
	"os/exec"
	"strings"
)

// This way of error handling is inspired by
// https://github.com/grafana/grafana/blob/master/build.go

func Run(cmd string, args ...string) []byte {
	bs, err := RunError(cmd, args...)
	if err != nil {
		log.Println(cmd, strings.Join(args, " "))
		log.Println(string(bs))
		log.Fatal(err)
	}
	return bytes.TrimSpace(bs)
}

func RunError(cmd string, args ...string) ([]byte, error) {
	ecmd := exec.Command(cmd, args...)
	bs, err := ecmd.CombinedOutput()
	if err != nil {
		return nil, err
	}
	return bytes.TrimSpace(bs), nil
}

func RunPrint(cmd string, args ...string) {
	log.Println(cmd, strings.Join(args, " "))
	ecmd := exec.Command(cmd, args...)
	ecmd.Stdout = os.Stdout
	ecmd.Stderr = os.Stderr
	err := ecmd.Run()
	if err != nil {
		log.Fatal(err)
	}
}