request for help with a plugin

[Stefano Zamboni]

hi all, new to this list and not a yum guru

a little premise: I'm working on a centos derived distro (Koozali SME 
server)
we have a plugin to execute some tasks during yum transaction and, if 
some kind of rpms is installed/updated/removed, we ask users to reboot 
the server.

this is bad and I'm trying to solve the issue

so far, I created a patch to our plugin that almost works, but I didn't 
manage in retireving the list of removed files when a package is removed..

tried to search with google with no luck (maybe I miss the search 
keys).. do you have any example?

TIA

Stefano