shutdown.go

stop := make(chan struct{})

	go func() {
		<-signals.SetupSignalHandler()
		stop <- struct{}{}
	}()

	file := "/wherever"
	go func() {
		watcher, _ := fsnotify.NewWatcher()
		defer watcher.Close()

		updated := make(chan bool)
		go func() {
			orig, _ := ioutil.ReadFile(file)
			for {
				<-watcher.Events
				latest, _ := ioutil.ReadFile(file)
				if !bytes.Equal(orig, latest) {
					break
				}
			}
			updated <- true
		}()
		watcher.Add(file)
		<-updated
		<-stop
	}()