minor: move some code to saveConfig() to make it more readable

Signed-off-by: Alex Lyashko <[email protected]>

agent/agent.go

@@ -94,24 +94,9 @@ func Listen(opts Options) (err error) {
 	if err != nil {
 		return err
 	}
-	port := listener.Addr().(*net.TCPAddr).Port
 
-	gopsdir := opts.ConfigDir
-	if gopsdir == "" {
-		cfgDir, err := internal.ConfigDir()
-		if err != nil {
-			return err
-		}
-		gopsdir = cfgDir
-	}
-
-	err = os.MkdirAll(gopsdir, os.ModePerm)
-	if err != nil {
-		return err
-	}
-
-	portfile = filepath.Join(gopsdir, strconv.Itoa(os.Getpid()))
-	err = os.WriteFile(portfile, []byte(strconv.Itoa(port)), os.ModePerm)
+	port := listener.Addr().(*net.TCPAddr).Port
+	err = saveConfig(opts, port)
 	if err != nil {
 		return err
 	}
@@ -149,6 +134,30 @@ func listen(l net.Listener) {
 	}
 }
 
+func saveConfig(opts Options, port int) (err error) {
+	gopsdir := opts.ConfigDir
+	if gopsdir == "" {
+		cfgDir, err := internal.ConfigDir()
+		if err != nil {
+			return err
+		}
+		gopsdir = cfgDir
+	}
+
+	err = os.MkdirAll(gopsdir, os.ModePerm)
+	if err != nil {
+		return err
+	}
+
+	portfile = filepath.Join(gopsdir, strconv.Itoa(os.Getpid()))
+	err = os.WriteFile(portfile, []byte(strconv.Itoa(port)), os.ModePerm)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func gracefulShutdown() {
 	c := make(chan os.Signal, 1)
 	gosignal.Notify(c, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)