[Pkg-mailman-hackers] Bug#919145: mailman3: stretch-backports dependencies can not be satisfied with python3-alembic from backports

[Antoine Beaupre]

On Sun, Jan 13, 2019 at 07:32:25AM +0000, Sampo Sorsa wrote:
> Package: mailman3
> Version: 3.2.0-4~bpo9+1
> 
> Dear Maintainer,
> 
> The mailman3 dependencies can not be satisfied with python3-alembic from stretch-backports:
> 
> Package: mailman3
> Depends: python3-alembic, python3-sqlalchemy (>= 1.2.3)
> 
> Package: python3-alembic
> Version: 1.0.0-2~bpo9+1
> Depends: python3-sqlalchemy (>= 1.0~), python3-sqlalchemy (<< 1.1)
> 
> The python3-sqlalchemy dependency is conflicting. The only way to resolve this is to downgrade python3-alembic to stretch version:
> 
> Package: python3-alembic
> Version: 0.8.8-2
> Depends: python3-sqlalchemy (>= 0.7.6)
> 
> Perhaps this bug should be filed under python3-alembic to request backports upgrade (although buster is 1.0.0-2 too), but I wanted to make both maintainers and users of mailman3 aware of the issue. Please refile if necessary.

Maybe the problem is those backports were not built with backports
available, which hardcoded the version numbers to the ones in stretch.

It was immediately obvious to me so I figured I would also share the
workaround here, which is simply:

    apt install python3-alembic python3-sqlalchemy
    apt install -t stretch-backports mailman3-full

A.

-- 
Au nom de l'état, la force s'appelle droit.
Au main de l'individu, elle s'appelle crime.
                        - Max Stirner
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