Add flag for passing config file

main.go

@@ -2,18 +2,35 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"net/http"
+	"os"
 )
 
 var BusClient *http.Client
-var Quays []Quay = []Quay{}
+var Quays []Quay
 
 func main() {
+	var confFilename string
 	var port int
 
+	flag.StringVar(&confFilename, "c", "", "Path to the configuration file")
 	flag.IntVar(&port, "p", 4444, "The port to start the server on")
 	flag.Parse()
 
+	if confFilename == "" {
+		fmt.Printf("No configuation file provided. Provide the path to a configuration file with the -c flag.\n")
+		os.Exit(0)
+	}
+
+	conf, err := ReadConfigFromFile(confFilename)
+	if err != nil {
+		fmt.Printf("%v\n", err)
+		os.Exit(1)
+	}
+
+	Quays = conf.Quays
+
 	BusClient = &http.Client{}
 	serveHttp(port)
 }