Bug#1058208: pytorch-sparse: FTBFS: ImportError: Failed to load PyTorch C extensions:

[Lucas Nussbaum]

Source: pytorch-sparse
Version: 0.6.18-1
Severity: serious
Justification: FTBFS
Tags: trixie sid ftbfs
User: lucas at debian.org
Usertags: ftbfs-20231212 ftbfs-trixie

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.


Relevant part (hopefully):
>  debian/rules clean
> dh clean --buildsystem=pybuild
>    dh_auto_clean -O--buildsystem=pybuild
> I: pybuild base:310: python3.12 setup.py clean 
> Traceback (most recent call last):
>   File "/<<PKGBUILDDIR>>/setup.py", line 8, in <module>
>     import torch
>   File "/usr/lib/python3/dist-packages/torch/__init__.py", line 443, in <module>
>     raise ImportError(textwrap.dedent('''
> ImportError: Failed to load PyTorch C extensions:
>     It appears that PyTorch has loaded the `torch/_C` folder
>     of the PyTorch repository rather than the C extensions which
>     are expected in the `torch._C` namespace. This can occur when
>     using the `install` workflow. e.g.
>         $ python setup.py install && python -c "import torch"
> 
>     This error can generally be solved using the `develop` workflow
>         $ python setup.py develop && python -c "import torch"  # This should succeed
>     or by running Python from a different directory.
> E: pybuild pybuild:395: clean: plugin distutils failed with: exit code=1: python3.12 setup.py clean 
> dh_auto_clean: error: pybuild --clean -i python{version} -p "3.12 3.11" returned exit code 13
> make: *** [debian/rules:10: clean] Error 25


The full build log is available from:
http://qa-logs.debian.net/2023/12/12/pytorch-sparse_0.6.18-1_unstable.log

All bugs filed during this archive rebuild are listed at:
https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-20231212;users=lucas@debian.org
or:
https://udd.debian.org/bugs/?release=na&merged=ign&fnewerval=7&flastmodval=7&fusertag=only&fusertagtag=ftbfs-20231212&fusertaguser=lucas@debian.org&allbugs=1&cseverity=1&ctags=1&caffected=1#results

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

If you reassign this bug to another package, please mark it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with mine
so that we can identify if something relevant changed in the meantime.