added config path as parameter

coolDns.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"io/ioutil"
 	"log"
 	"net"
@@ -57,8 +58,8 @@ var anyRecordTypes = []uint16{
 	dns.TypeCAA,
 }
 
-func loadConfig() (*config, error) {
-	file, err := ioutil.ReadFile("config.yml")
+func loadConfig(configPath string) (*config, error) {
+	file, err := ioutil.ReadFile(configPath)
 	if err != nil {
 		return nil, err
 	}
@@ -324,7 +325,11 @@ func handleRequest(w dns.ResponseWriter, r *dns.Msg, zone zoneView) {
 }
 
 func main() {
-	config, err := loadConfig()
+
+	configPath := flag.String("c", "/etc/cool-dns/config.yaml", "path to the config file")
+	flag.Parse()
+
+	config, err := loadConfig(*configPath)
 	if err != nil {
 		log.Fatalf("Failed to load config: %s", err.Error())
 	}