if not verify_signature(package_path, remote["signature_hex"]): logging.error("Signature verification failed") return
def apply_update(package_path): # Example: unzip into install_directory import zipfile with zipfile.ZipFile(package_path, 'r') as zip_ref: zip_ref.extractall(CONFIG["install_directory"]) # Alternatively: run an installer .msi or .pkg logging.info("Update applied successfully")
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 standaloneupdaterdaemon
Example systemd unit:
stop_main_app() apply_update(package_path) update_local_version("version": remote["version"]) restart_main_app() logging.info("Update completed successfully") if not verify_signature(package_path
download_update(remote["download_url"], package_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 "w") as f: json.dump(new_version_info
logging.info(f"Update available: local['version'] -> remote['version']")