Implement the watcher correctly

agent.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"os"
 	"path"
@@ -9,6 +8,12 @@ import (
 	"github.com/fsnotify/fsnotify"
 )
 
+func stop() {
+	log.Println("Have a nice day.")
+	// TODO: Make the error code optional (as a parameter)
+	os.Exit(1)
+}
+
 func watchForConfigChanges() {
 	watcher, err := fsnotify.NewWatcher()
 	if err != nil {
@@ -21,12 +26,22 @@ func watchForConfigChanges() {
 		for {
 			select {
 			case event := <-watcher.Events:
-				log.Println("event: ", event)
+				// The file is changed. This is the only event we are interested
+				// in. If the file is renamed, removed or something else, we drop
+				// an error to the user.
 				if event.Op&fsnotify.Write == fsnotify.Write {
-					log.Println("modified file:", event.Name)
+					log.Println("Reload the config file ...")
+				}
+
+				if event.Op&fsnotify.Rename == fsnotify.Rename ||
+					event.Op&fsnotify.Remove == fsnotify.Remove {
+					log.Println("The 'keymap.conf' configuration file is renamed or removed. We cant do any further changes without the config file. So create the file or rename it back and restart the agent.")
+					stop()
 				}
 			case err := <-watcher.Errors:
-				log.Println("error:", err)
+				log.Println("We have the following problem with the 'keymap.conf' configuration file: ", err)
+				log.Println("Try the fix this problem by yourself and restart the agent.")
+				stop()
 			}
 		}
 	}()
@@ -37,7 +52,6 @@ func watchForConfigChanges() {
 	// places where windows will put it).
 	config_path, err := os.Getwd()
 	config_file := path.Join(config_path, "keymap.conf")
-
 	err = watcher.Add(config_file)
 	if err != nil {
 		log.Fatal("Can't find the 'keymap.conf' configuration file. Please create one.")
@@ -46,6 +60,6 @@ func watchForConfigChanges() {
 }
 
 func main() {
-	fmt.Printf("Ready\n")
 	watchForConfigChanges()
+	stop()
 }