main.go

package main

import "os"
import "fmt"
import "strings"
import "io/ioutil"

var err error
var blob string
var path = "/etc/munin/munin-conf.d/hosts.conf"

func init() {
	var cnf []byte
	cnf, err = ioutil.ReadFile(path)
	if err != nil {
		panic(err)
	}

	blob = string(cnf)
}

func main() {
	if len(os.Args) != 3 {
		os.Exit(1)
	}

	if strings.Index(blob, fmt.Sprintf("[%v]", os.Args[1])) > 0 {
		return
	}

	if strings.Index(blob, fmt.Sprintf("address %v\n", os.Args[2])) > 0 {
		return
	}

	blob += "\n" + fmt.Sprintf("[%v]\n\taddress %v\n", os.Args[1], os.Args[2])
	err = ioutil.WriteFile(path, []byte(blob), 777)
	if err != nil {
		panic(err)
	}
}