How to execute user's scripts when upgrading a certain package via apt/aptitude

[Mikhail Morfikov <mmorfikov@xxxxxxxxx>]

I have some packages, for instance firefox, which need a little bit of
customization from a user side. So basically when I install the new version of
firefox, I also have to do some extra steps and so far I've been doing it
manually because I don't know any better way.

In the case of firefox, I have to create some hard links. Those hard links are
used as additional executable files to be profiled in AppArmor. But when I
upgrade my system, and firefox is on the package list, the hard links basically
stop working and they have to be removed and recreated manually after the
upgrade is done.

Is there a way to pass some extra commands/script to apt/aptitude so when the
firefox package is to be upgraded, it would recreate the links automatically?

--
Morfik

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