# Watches for an update request written by the web interface.
#
# install.sh substitutes __PREFIX__ and writes the result to
# /etc/systemd/system/lembas-update.path. Installed only when the installer is
# run with INSTALL_UPDATE_HELPER=1 — see deploy/README.md for what that decision
# means.
#
# `PathExists` rather than `PathChanged`: the service deletes the file as its
# first act, so the unit re-arms itself and a second request fires again. With
# `PathChanged` a request written while the service was running would be missed.

[Unit]
Description=Watch for a LLeMbas update request
# Only while the thing being updated is meant to be running. Stopping lembas on
# purpose should not leave a watcher that restarts it.
PartOf=lembas.service

[Path]
PathExists=__PREFIX__/data/update-requested
Unit=lembas-update.service

[Install]
WantedBy=multi-user.target