I'd like to inhibit suspend while backups run on my laptop. I'm
scheduling those backups with a systemd timer[1] and service[2]. I've
read that the default polkit policy only permits inhibiting suspend from
within a login session, so I've also tried to add rules to allow the
root user to inhibit suspend[3]. However, with all of those in place, I
still get errors that I think indicate that the "systemd-inhibit"
command is failing[4].
I'm running this on Fedora 33. Has anyone successfully used
systemd-inhibit from a systemd unit?
1:
# cat /usr/lib/systemd/system/run-borg.timer
[Unit]
Description=Periodic borg backup
[Timer]
OnCalendar=08..20/2:00
Persistent=true
[Install]
WantedBy=timers.target
2:
# cat /usr/lib/systemd/system/run-borg.service
[Unit]
Description=Run borg backup
RequiresMountsFor=/var/log
ConditionACPower=true
[Service]
Type=oneshot
ExecStart=/usr/bin/systemd-inhibit --who=borg-backup '--why=Backup in
progress' --mode=block /root/run-borg
3:
# cat /etc/polkit-1/rules.d/root-inhibit-suspend.rules
polkit.addRule(function(action, subject) {
if (action.id == "org.freedesktop.login1.inhibit-block-shutdown" &&
subject.isInGroup("root")) {
return polkit.Result.YES;
}
});
polkit.addRule(function(action, subject) {
if (action.id == "org.freedesktop.login1.inhibit-block-sleep" &&
subject.isInGroup("root")) {
return polkit.Result.YES;
}
});
polkit.addRule(function(action, subject) {
if (action.id == "org.freedesktop.login1.inhibit-block-idle" &&
subject.isInGroup("root")) {
return polkit.Result.YES;
}
});
4:
Mar 21 18:00:41 vagabond systemd[1]: Starting Run borg backup...
Mar 21 18:00:41 vagabond systemd-inhibit[19767]: read: Connection reset
by peer
Mar 21 18:00:41 vagabond systemd-inhibit[19761]: /root/run-borg failed
with exit status 1.
Mar 21 18:00:41 vagabond systemd[1]: run-borg.service: Main process
exited, code=exited, status=1/FAILURE
Mar 21 18:00:41 vagabond systemd[1]: run-borg.service: Failed with
result 'exit-code'.
Mar 21 18:00:41 vagabond systemd[1]: Failed to start Run borg backup.
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