bug#53258: Python unable to find modules within a Singularity container created with guix pack

[Ludovic Courtès]

Hi Josselin,

Josselin Poiret <dev@jpoiret.xyz> skribis:

> After the IRC investigation, it turned out the use of abspath in
> Lib/site.py was in fact the culprit. Replacing all its uses with
> realpath and doing `./pre-inst-env guix pack -RR python python-numpy -S
> /bin=bin -S /etc=etc` did in fact resolve the issue!
>
> I've raised the issue upstream at [1].  The fix itself is pretty simple,
> but it's theoretically a breaking change, so we'll see how Python
> maintainers want to move forward with it.  We could backport this fix
> for the next core-updates cycle, whether or not it gets accepted
> upstream, and we will also need to modify sitecustomize.py as well to
> call os.path.realpath on python_site.

> [1] https://bugs.python.org/issue46653

Thanks for the investigation and for reporting it upstream!

Is there a workaround we could apply locally, ideally one that does not
lead to a world rebuild?

Ludo’.