backend: detect non-atomic file operation to look at another event

backend/main.go

@@ -109,6 +109,8 @@ func main() {
 		log.Fatal(err)
 	}
 
+	watchedNotify := fsnotify.Create
+
 	for {
 		select {
 		case ev := <-watcher.Events:
@@ -117,8 +119,11 @@ func main() {
 				if err := watchsubdir(watcher, ev.Name); err != nil {
 					log.Println(err)
 				}
-			} else if ev.Op & fsnotify.Create == fsnotify.Create {
+			} else if ev.Op & watchedNotify == watchedNotify {
 				go treat(ev.Name)
+			} else if ev.Op & fsnotify.Write == fsnotify.Write {
+				log.Println("FSNOTIFY WRITE SEEN. Prefer looking at them, as it appears files are not atomically moved.")
+				watchedNotify = fsnotify.Write
 			} else if *debugINotify {
 				log.Println("Skipped event:", ev, "for", ev.Name)
 			}