Restart: only do restart if running via the wrapper script

modules/restart.py

@@ -0,0 +1,23 @@
+import os
+from pathlib import Path
+
+from modules.paths_internal import script_path
+
+
+def is_restartable() -> bool:
+    """
+    Return True if the webui is restartable (i.e. there is something watching to restart it with)
+    """
+    return bool(os.environ.get('SD_WEBUI_RESTART'))
+
+
+def restart_program() -> None:
+    """creates file tmp/restart and immediately stops the process, which webui.bat/webui.sh interpret as a command to start webui again"""
+
+    (Path(script_path) / "tmp" / "restart").touch()
+
+    stop_program()
+
+
+def stop_program() -> None:
+    os._exit(0)