n3rdpad-agent/agent.go

package main

import (
	"log"
	"os"
	"path"

	"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 {
		log.Fatal(err)
	}
	defer watcher.Close()

	done := make(chan bool)
	go func() {
		for {
			select {
			case event := <-watcher.Events:
				// 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("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("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()
			}
		}
	}()

	// The configuration file need to be in the same directory as the binary.
	// Later on, we can add other paths, where the file can be placed (like as a
	// dotfile in the home directory or in the .config/n3rdpad/ folder or other
	// 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.")
	}
	<-done
}

func main() {
	watchForConfigChanges()
	stop()
}