I don't think it's systemd's fault. There is a sub-optimal sed regex in
most courier init.d scripts. Here is a scenario with courier-mta-ssl as
an example (though, it also happens to other parts like courier-imap-ssl):
Usually, the config file /etc/courier/esmtpd-ssl contains:
ESMTPDSSLSTART=YES
And everything works fine. However, when you save the config through the
admin webpage, it changes it to:
ESMTPDSSLSTART="YES"
This should be fine as well, since the shell command executed by the
admin page parses it just the same:
> /usr/sbin/esmtpd-ssl stop ; . /etc/courier/esmtpd-ssl ; test
"$ESMTPDSSLSTART" != YES || /usr/sbin/esmtpd-ssl start
But in /etc/init.d/courier-mta-ssl it is parsed with sed:
DO_START=$(sed -ne 's/^ESMTPDSSLSTART=\([^[:space:]]*\)/\1/p'
/etc/courier/esmtpd-ssl | tr "A-Z" "a-z")
Which leads to DO_START containing the value "yes" including the quotes.
Further down the line in /usr/lib/courier/init-d-script-courier this
causes the script to exit quietly, if DO_START is anything other then yes.
After replacing the line with:
DO_START=$(sed -ne 's/^ESMTPDSSLSTART=\W*\(\w\+\)\W*/\1/p'
/etc/courier/esmtpd-ssl | tr "A-Z" "a-z")
"systemctl restart courier-mta-ssl" works again.
Note 1: The ugly thing is, that when you make the changes through the web
interface, everything continues to work fine, because it parses the
config files correctly during restart. Then some time later, when you
restart the machine or restart the service with systemctl, it doesn't
come up again with no hints at all in the log files. I also think it
happens when courier crashes, and systemd tries to restart the service.
Note 2: Another thing is curious: Not all courier services use the init.d
scripts, some have their own systemd config in /lib/systemd/system/
which bypass the init.d script:
> systemctl status `systemctl -t service | grep courier | awk '{ print
$1; }'` | grep Loaded
Loaded: loaded (/lib/systemd/system/courier-authdaemon.service;
enabled; vendor preset: enabled)
Loaded: loaded (/etc/init.d/courier-imap-ssl; generated)
Loaded: loaded (/lib/systemd/system/courier-imap.service; enabled;
vendor preset: enabled)
Loaded: loaded (/etc/init.d/courier-msa; generated)
Loaded: loaded (/etc/init.d/courier-mta-ssl; generated)
Loaded: loaded (/etc/init.d/courier-pop-ssl; generated)
Loaded: loaded (/lib/systemd/system/courier-pop.service; enabled;
vendor preset: enabled)
Loaded: loaded (/etc/init.d/courier; generated)
Loaded: loaded (/etc/init.d/courierfilter; generated)
So only the services
courier-imap-ssl
courier-msa
courier-mta-ssl
courier-pop-ssl
are prone to this bug, which gives the whole thing an even more sporadic
character.
Regards,
Norbert
