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

On 2018-03-28 19:46 +0200, Mikhail Morfikov wrote:

> On 2018-03-28 19:29, Sven Joachim wrote:
>> On 2018-03-28 18:29 +0200, Mikhail Morfikov wrote:
>>> 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?
>> You could use a dpkg trigger for that, a short intro how to do this is
>> on stackoverflow[1].  See also deb-triggers(5).
> Is this a solution for a user or rather for maintainer of the package? I think
> it's the second one and hence I can't use it.

It requires you to create your own package (since there is no other way
to register triggers in dpkg), but it does not have to contain any
files, you only need to include the triggers list and a postinst script
which manages the links.

An alternative is to use the dpkg's post-invoke option, but that is
rather inefficient, since it will be run on every dpkg invocation and
not only when one of the packages which interest you is