Standaloneupdaterdaemon

def update_local_version(new_version_info): with open(CONFIG["local_version_file"], "w") as f: json.dump(new_version_info, f, indent=2) def run_update_cycle(): try: local = get_local_version() remote = fetch_remote_manifest() if remote.get("version") == local.get("version"): logging.info("Already up to date") return

def download_update(url, dest_path): logging.info(f"Downloading update from url") r = requests.get(url, stream=True) with open(dest_path, "wb") as f: for chunk in r.iter_content(chunk_size=8192): f.write(chunk) return dest_path

# Create temp dir Path(CONFIG["temp_download_dir"]).mkdir(parents=True, exist_ok=True) package_path = os.path.join(CONFIG["temp_download_dir"], "update_package.zip") standaloneupdaterdaemon

def stop_main_app(): # Example: use pidfile or pkill try: subprocess.run(["pkill", "-f", CONFIG["main_app_executable"]], check=False) time.sleep(2) # give it time to exit except Exception as e: logging.warning(f"Could not stop main app: e")

logging.info(f"Update available: local['version'] -> remote['version']") "w") as f: json.dump(new_version_info

[Unit] Description=Standalone Software Updater Daemon After=network.target [Service] ExecStart=/usr/bin/python3 /opt/myapp/standalone_updater_daemon.py Restart=always User=daemon

def restart_main_app(): subprocess.Popen([CONFIG["main_app_executable"]], start_new_session=True) stream=True) with open(dest_path

def verify_signature(file_path, expected_signature_hex): # Simplified: compute SHA256 and compare with signed hash hasher = hashlib.sha256() with open(file_path, "rb") as f: for chunk in iter(lambda: f.read(4096), b""): hasher.update(chunk) computed_hash = hasher.hexdigest() return computed_hash == expected_signature_hex