[ILUG] Logrotate, wildcards and postrotate script parameters

[Niall O Broin]

When using logrotate with wildcards, you can specify that a postrotate  
script should only run once so that if e.g. you were rotating a bunch  
of log files from one apache server, you would only restart apache once.

However, I have a slightly different requirement - I'd like to run the  
postrotate script once for each log file (in this case I'm rotating  
production.log files for Rails apps running under passenger) hence I'd  
use nosharedscripts (which is anyway the default) but I need to pass  
the script a parameter which is the name of the log file which was  
just rotated (so that passenger can restart the appropriate Rails  
instance).  Ideally, I'd like to be able to have a logrotate.d/rails   
config like this

/APPSBASE/*/shared/log/production.log {
   daily
   missingok
   rotate 7
   compress
   delaycompress
   sharedscripts
   postrotate
     passenger_restart $LOG
   endscript


where passenger_restart is a script which will restart passenger for a  
given app, given its production log file name, and $LOG is the  
particular log file which has now been matched by the wildcard. Sadly,  
logrotate doesn't seem to have the ability to produce $LOG.

The only idea I have is to generate the logrotate.d/rails config file  
on the fly each time which would work, and wouldn't be particularly  
difficult, but it's a bit of a kludge - I'd prefer a solution whch  
works entirely within logrotate.

I have RTFM and STFW but with no success, so as a last resort I turn  
to the collective wisdom of ILUG - any ideas?

Niall