nagios event handlers

I've gone over to the Dark Side (no, not Python) and have just implemented my first nagios event handler - This *should* automatically try and fix the problem we have with our Dirvish backup scrips - namely that we end up with too many copies of the database dumps held.

So - cue nagios' event handlers - the only issue should be that nagios (and the event handler) runs as user nagios and most sysadmin stuff needs root. If you're willing to trust it to sudo then it should be OK.