[systemd-devel] sysv-generator weirdness for shutdown runlevels

[Michael Biebl]

And if a service does not have an explicit stop on shutdown/reboot,
the processes are killed in a final killing spree where there are not
ordering guarantees.


2016-05-25 23:08 GMT+02:00 Michael Biebl <mbiebl at gmail.com>:
> Hm, I've already given you the answer on IRC, so I'm not sure why you
> ask them again.
>
> The K symlinks determine whether a service needs an explicit stop
> request on shutdown (i.e. Conflicts/Before: shutdown.target).
>
> That's exactly how sysvinit also worked. If there was a K symlink in
> rc0 and rc6, the service is stopped via /etc/init.d/foo stop.
>
> Not sure what's unclear about that.
>
> 2016-05-25 22:12 GMT+02:00 Francis Moreau <francis.moro at gmail.com>:
>> Hello,
>>
>> I'm starring at a chunk of code of the sysv-generator (shown below)
>> for some while now and I still can't see its purpose.
>>
>> Here's the code taken from src/sysv-generator/sysv-generator.c:
>>
>> static int set_dependencies_from_rcnd(const LookupPaths *lp, Hashmap
>> *all_services) {
>>
>> [...]
>>
>>                                 } else if (de->d_name[0] == 'K' &&
>>                                            (rcnd_table[i].type ==
>> RUNLEVEL_DOWN)) {
>>
>>
>> set_ensure_allocated(&shutdown_services, NULL);
>>                                     set_put(shutdown_services, service);
>>                                 }
>> [...]
>>
>> For simplicity sake, I removed the sanity checkings.
>>
>> If I parsed it correctly, it handles symlinks in rc[06].d/ such as:
>> /etc/init.d/rc0.d/K50foo.
>>
>> In this case this adds a "Conflicts=shutdown.target" and
>> "Before=shutdown.target" to the foo stub service.
>>
>> What exactly the point to do that specially ? which sysvinit behavior
>> systemd is try to mimic ?
>>
>> Thanks.
>> --
>> Francis
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>> systemd-devel at lists.freedesktop.org
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>
>
>
> --
> Why is it that all of the instruments seeking intelligent life in the
> universe are pointed away from Earth?



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