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




On 2018-03-28 20:12, Sven Joachim wrote:
> 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
> updated/installed/removed.
> 
> Cheers,
>        Sven
> 
I really thought there's some easy way to include user's scripts when you want
to make some additional changes to the upgraded packages, but it looks like the
apt mechanism is a little bit limited. But I will try to do something with the
trigger and see how that will work.

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