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

On 2018-03-28 21:25, David Wright wrote:
> On Wed 28 Mar 2018 at 20:00:34 (+0200), Mikhail Morfikov wrote:
>> On 2018-03-28 18:58, Andy Smith wrote:
>>> On Wed, Mar 28, 2018 at 06:29:06PM +0200, Mikhail Morfikov wrote:
>>>> 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?
>>> I've never tried it but looking at "man apt.conf" it seems that
>>> setting Apt::Post-Invoke (or possible Apt::Post-Invoke-Success?)
>>> might be useful to you, as you could use it to run a script that
>>> checks that your firefox setup is as you want it.
>> I'm aware of the options, but even if I put some script in Post-Invoke, there's
>> still a problem concerning how to pass the information to the script that the
>> firefox package was upgraded. Is there some variable that holds, for instance, a
>> list of the packages that apt wants to upgrade? In such way it would be easy to
>> set this up. But if the script doesn't know which packages are upgraded (or just
>> the specific one), it has to be run and remove the hard links with each
>> upgrade/installation process, and this isn't really what I want to achieve.
> You said these were hardlinks. If so, then the most straightforward
> is to look at the link counts. When the old version of the program
> and whatever files are involved in the upgrade, is removed (as it
> were, because your own links will preserve its existence), the
> link count of your hard links will decrease, likely to 1.
> As you probably know, the link count is given by ls -l in the
> second field, between the permissions and the owner.
> Cheers,
> David.
That could work.

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