logrotate: Don't fail when syslog not running

[donald]

Avoid error

logrotate[225]: dateext suffix '.2019-10'
logrotate[225]: glob pattern '.[0-9][0-9][0-9][0-9]-[0-9][0-9]'
logrotate[225]: renaming /var/log/messages to /var/log/messages.2019-10
logrotate[225]: running postrotate script
logrotate[225]: cat: /var/run/rsyslogd.pid: No such file or directory
logrotate[225]: kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... o
logrotate[225]: error: error running shared postrotate script for '/var/log/messages '
systemd[1]: logrotate.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: logrotate.service: Failed with result 'exit-code'.
systemd[1]: Failed to start Rotate log files.

[donald]

Hmmm. Even with || true the usage message would be emitted, which doesn't hurt but but is ugly anyway. Merge or improve. Your choice. :-)

[david]

What do you think, if we do on this way ?

if [ -f /var/run/rsyslogd.pid ]; then
	kill -HUP $(cat /var/run/rsyslogd.pid)
else
        send mail or start rsyslogd
fi

[donald]

Well, to be true, I think, logrotate should rotate logfiles, not start or monitor other daemons.

But if [ -f /var/run/rsyslogd.pid ]; then ... is fine, although my style probably would rather be something like test -f /var/run/rsyslogd.pid && ... :-)

[david]

looks fine :-)