added listen flag

main.go

@@ -101,6 +101,7 @@ func validateUnlockCommand(command string) bool {
 
 func main() {
 	unlockCommandFlag := flag.String("command", "", "what script to execute to unlock the volume")
+	listenOn := flag.String("listen", ":50059", "specify port to listen on")
 	flag.Parse()
 
 	if *unlockCommandFlag == "" {
@@ -125,7 +126,7 @@ func main() {
 	mux.Handle("/api/unlock", apiKeyMiddleware(apiKey, http.HandlerFunc(unlockZFSHandler)))
 
 	srv := &http.Server{
-		Addr:         ":8080",
+		Addr:         *listenOn,
 		Handler:      mux,
 		ReadTimeout:  5 * time.Second,
 		WriteTimeout: 31 * time.Second,