The ‘avahi-daemon’ service fails to restart these days: a stale
/run/avahi-daemon/pid upon reboot leads it to abandon. From
/var/log/messages:
--8<---------------cut here---------------start------------->8---
Aug 16 13:29:11 localhost shepherd[1]: Starting service avahi-daemon...
Aug 16 13:29:11 localhost shepherd[1]: Service avahi-daemon has been started.
Aug 16 13:29:11 localhost shepherd[1]: Service avahi-daemon started.
Aug 16 13:29:11 localhost shepherd[1]: Service avahi-daemon running with value
(("unknown" . #<input-output: socket 27>)).
Aug 16 13:29:11 localhost shepherd[1]: Spawning systemd-style service
/gnu/store/yfl1x5k3njghkg4ckximqb0ysppvx8na-avahi-0.8/sbin/avahi-daemon.
Aug 16 13:29:11 localhost shepherd[1]: Running value of service avahi-daemon
changed to 1497.
Aug 16 13:29:11 localhost shepherd[1]: Service avahi-daemon (PID 1497) exited
with 255.
Aug 16 13:29:11 localhost shepherd[1]: Service avahi-daemon has been disabled.
Aug 16 13:29:11 localhost shepherd[1]: (Respawning too fast.)
--8<---------------cut here---------------end--------------->8---
… and /var/log/avahi-daemon.log:
--8<---------------cut here---------------start------------->8---
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
2024-08-16 13:29:11 Daemon already running on PID 1346
--8<---------------cut here---------------end--------------->8---
The issue was uncovered by the switch to socket activation in commit
3298ec0200af0d0b0850a388df0a78e87320307f: despite using socket
activation, avahi-daemon checks for the presence of a PID file; however,
there’s no longer a cleanup process as is the case when #:log-file is
used, hence the bug.
But the core problem seems to be that ‘cleanup-service-type’ deletes
/var/run at boot but not /run. I guess it should delete /run as well?
Ludo’.
