From 5fa57d5ecf66898a5bd15fa1339494d4e3a864f6 Mon Sep 17 00:00:00 2001
From: root <root@pve1.takeo.lan>
Date: Thu, 12 Mar 2026 14:14:58 +0700
Subject: [PATCH] fix: PID-Lock verhindert doppelte Bot-Instanzen

---
 homelab-ai-bot/telegram_bot.py | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/homelab-ai-bot/telegram_bot.py b/homelab-ai-bot/telegram_bot.py
index 95f491d4..a6b6e417 100644
--- a/homelab-ai-bot/telegram_bot.py
+++ b/homelab-ai-bot/telegram_bot.py
@@ -4,9 +4,39 @@ import asyncio
 import logging
 import sys
 import os
+import fcntl
+import atexit
+import signal
 
 sys.path.insert(0, os.path.dirname(__file__))
 
+PIDFILE = "/tmp/hausmeister-bot.pid"
+_lock_fp = None
+
+
+def _acquire_lock():
+    """Stellt sicher, dass nur eine Bot-Instanz läuft (PID-File + flock)."""
+    global _lock_fp
+    _lock_fp = open(PIDFILE, "w")
+    try:
+        fcntl.flock(_lock_fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except OSError:
+        print(f"ABBRUCH: Bot läuft bereits (PID-File {PIDFILE} ist gelockt)", file=sys.stderr)
+        sys.exit(1)
+    _lock_fp.write(str(os.getpid()))
+    _lock_fp.flush()
+
+
+def _release_lock():
+    global _lock_fp
+    if _lock_fp:
+        try:
+            fcntl.flock(_lock_fp, fcntl.LOCK_UN)
+            _lock_fp.close()
+            os.unlink(PIDFILE)
+        except OSError:
+            pass
+
 from telegram import BotCommand, Update, ReplyKeyboardMarkup, KeyboardButton
 from telegram.ext import (
     Application, CommandHandler, MessageHandler, filters, ContextTypes,
@@ -291,6 +321,10 @@ def main():
         log.error("TG_HAUSMEISTER_TOKEN fehlt in homelab.conf!")
         sys.exit(1)
 
+    _acquire_lock()
+    atexit.register(_release_lock)
+    signal.signal(signal.SIGTERM, lambda *_: sys.exit(0))
+
     log.info("Starte Orbitalo Hausmeister-Bot...")
     app = Application.builder().token(token).build()