[Python-modules-team] Bug#963662: celery: FTBFS with Sphinx 3.1: Could not import extension celerydocs (exception: cannot import name 'NoUri' from 'sphinx.environment' (/usr/lib/python3/dist-packages/sphinx/environment/__init__.py))

[Lucas Nussbaum]

Source: celery
Version: 4.4.2-5
Severity: important
Tags: ftbfs
User: python-modules-team at lists.alioth.debian.org
Usertags: sphinx3.1

Hi,

celery fails to build with Sphinx 3.1, currently available in
experimental.

Relevant part (hopefully):
> make[1]: Entering directory '/<<PKGBUILDDIR>>'
> PYTHONPATH=. python3 -m sphinx -b html -d docs/.build/.doctrees -N docs /<<PKGBUILDDIR>>/debian/python-celery-doc/usr/share/doc/python-celery-doc/html
> Running Sphinx v3.1.1
> 
> Extension error:
> Could not import extension celerydocs (exception: cannot import name 'NoUri' from 'sphinx.environment' (/usr/lib/python3/dist-packages/sphinx/environment/__init__.py))
> make[1]: *** [debian/rules:21: override_dh_sphinxdoc] Error 2

The full build log is available from:
   http://qa-logs.debian.net/2020/06/23/celery_4.4.2-5_unstable_sphinx-exp.log

Please see [1] for Sphinx changelog, which may give a hint of what changes in
Sphinx caused this error.

Also see [2] for the list of deprecated/removed APIs and possible alternatives
to them.

Sphinx 3.1 is going to be uploaded to unstable in a couple of weeks. When that
happens, the severity of this bug will be bumped to serious.

In case you have questions, please Cc sphinx at packages.debian.org on reply.

[1]: https://www.sphinx-doc.org/en/3.x/changes.html
[2]: https://www.sphinx-doc.org/en/3.x/extdev/deprecated.html

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!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.