TLDR:
How to have an /etc/xdg/autostart/app.desktop service wait for a systemd service?
Long:
I have an app started by /etc/xdg/autostart/app.desktop that requires a systemd service to be started first.
I would like to avoid some sleep/wait/custom code if there is an existing tool for such purposes.
Is there some kind of wait_for_service_to_be_running <service-name> (systemd) command line tool?