Review request: syslog-ng (syslog replacement daemon)

[José Pedro Oliveira]

Jeremy Katz wrote:
> On Sat, 2005-05-07 at 23:14 +0100, Jose Pedro Oliveira wrote:
> 
>>>On Sat, 2005-05-07 at 19:26 +0100, Jose Pedro Oliveira wrote:
>>>
>>>>>On Sat, 2005-05-07 at 01:29 +0100, José Pedro Oliveira wrote:
>>>>>
>>>>>>  * Changes a file from another package
>>>>>>    (/etc/logrotate.d/syslog from the sysklogd rpm)
>>>>>
>>>>>Better to figure out how to generalize this.  See my later mail.
>>>>
>>>>Don't know how to do it without using alternatives.  The best solution
>>>>I came up with was to comment the /etc/logrotate.d/syslog lines
>>>>using triggers.
>>>>(previous comments in https://bugzilla.fedora.us/show_bug.cgi?id=1332)
>>>
>>>The only difference between the two files right now is what pid file
>>>they cat to figure out what service to restart.  Using a trigger to
>>>comment all of the sysklogd package's version of this file is *BROKEN*
>>>as just because a package is installed, doesn't mean it's being used.
>>>Not to mention that the trigger strikes me as being relatively prone to
>>>causing problems down the line.
>>
>>Can we expect that no changes are made to the syslog logrotate file?
> 
> 
> Can you expect no changes will be made that won't cause problems with
> your trigger?  Trust me, I've seen the most benign triggers fail and
> cause all kinds of fun upgrade problems.  Environments have a habit of
> changing in ways that you least expect.
> 
> 
>>Sure it isn't the best solution but it appears to be the one that
>>is less harmful.  The triggers are only activated during install
>>and removal of sysklogd or syslog-ng.
>>
>>
>>>As far as generalizing it, you could do this with a relatively trivial
>>>change to the initscript.  In the start/stop, create and remove a
>>>symlink of /var/run/syslog.pid that points to the syslog-ng pidfile.
>>>Sure, it's a bit hacky, but it's better than sed'ing provided config
>>>files all the time.
>>
>>It doesn't work for the following cenario:
>>  1) FC system with sysklogd
>>  2) install syslog-ng
>>  3) stop syslog
>>  4) start syslog-ng
>>  5) remove sysklogd
>>  => no logrotate file (!)
> 
> 
> Then you can either
> a) have syslog-ng require sysklogd
> b) include an identical (md5sum) logrotate file. 
> 
> If you do the latter, you'll even get the advantage of a conflict if the
> sysklogd one changes to make it obvious that you need to take a look.

The second option appears to work (still have to test several
more combinations of installation/removal/upgrading of sysklogd and
syslog-ng).

Syslog-ng devel branch updated.

Thanks,
jpo
-- 
José Pedro Oliveira
* mailto: jpo at di.uminho.pt * http://gsd.di.uminho.pt/~jpo *
* gpg fingerprint = F9B6 8D87 859D 1C94 48F0 84C0 9749 9EB5 91BD 851B *

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