pass config path in cmd args

merlin/merlin.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"net"
 	"os"
@@ -16,10 +17,23 @@ import (
 	"git.csclub.uwaterloo.ca/public/merlin/sync"
 )
 
-// get config path from command args
-var CONFIG_PATH = "merlin-config.ini"
+var DEFAULT_CONFIG_PATH = "merlin-config.ini"
 
 func main() {
+
+	// custom help message
+	flag.Usage = func() {
+		w := flag.CommandLine.Output()
+
+		fmt.Fprintf(w, "USAGE: merlin [-h | --help] [--config=<config-path>]\n")
+		flag.PrintDefaults()
+	}
+
+	// parse command args
+	// if more are added can prob use a library
+	configPath := flag.String("config", DEFAULT_CONFIG_PATH, "alternate config file")
+	flag.Parse()
+
 	// check that merlin is run as mirror user
 	// check that mirror user has pid of 1001
 
@@ -43,7 +57,7 @@ func main() {
 	repoIdx := 0
 
 	loadConfig := func() {
-		config.LoadConfig(CONFIG_PATH, doneChan, stopChan)
+		config.LoadConfig(*configPath, doneChan, stopChan)
 		logger.OutLog("Loaded config:\n" + fmt.Sprintf("%+v\n", config.Conf))
 
 		repoIdx = 0

merlin/sync/command_test.go

@@ -2,8 +2,8 @@ package sync
 
 import (
 	"path/filepath"
-	"testing"
 	"reflect"
+	"testing"
 
 	"git.csclub.uwaterloo.ca/public/merlin/config"
 	"git.csclub.uwaterloo.ca/public/merlin/logger"