Re: merged-/usr transition: debconf or not?

[Sven Joachim <svenjoac@gmx.de>]

On 2021-11-19 15:37 +0100, Michael Biebl wrote:

> On 19.11.21 11:58, Philip Hands wrote:
>> Ansgar <ansgar@43-1.org> writes:
>>
>>>> * doing this will, in a non-negligible number of cases, trigger the
>>>> bug to manifest on systems where that package is upgraded from a
>>>> version where the move had not taken place to one where it has.
>>>
>>> Why do you claim that?
>>>
>>> Given packages already did such moves in the last years and you claim
>>> this happens in a non-negligible number of cases, could you please
>>> point to some examples where this already happens in practice?
>> My understanding is that in order to trigger this bug you need at
>> least
>> to both move a file from one place to the other, and also to rename the
>> package that contains that file or move ownership to another package.
>> I suspect that you might also need to be unlucky with the order that
>> apt/dpkg decides to do the installation and, depending upon how far
>> apart the move and the rename happens, also unlucky with your choice of
>> from and to versions of the packages in question.
>
> Right. I think it would be immensely useful to have an actual
> reproducer so one could study the issue more closely or at least a bug
> report, which describes the issue in more detail, like the exact
> circumstances when this can happen.
> So far this is merely theoretical, right?
> Or do we have a documented instance of this happening?

#953562 seems to be such an instance.

Cheers,
       Sven