CI's `Tests / Docs / Doctest (pull_request)` throws an exception

[rruuaanng]

Bug report

Bug description:

I'm not sure if this is caused by my PR. But it seems to be caused by the CI service running

Run xvfb-run make -C Doc/ PYTHON=../python SPHINXERRORHANDLING="-W --keep-going" doctest
 xvfb-run make -C Doc/ PYTHON=../python SPHINXERRORHANDLING="-W --keep-going" doctest
 shell: /usr/bin/bash -e{0}
 env:
 FORCE_COLOR: 1
make: Entering directory '/home/runner/work/cpython/cpython/Doc'
make[1]: Entering directory '/home/runner/work/cpython/cpython/Doc'
mkdir -p build

Missing the required blurb or sphinx-build tools.
Please run 'make venv' to install local copies.

make[1]: *** [Makefile:55: build] Error 1
make[1]: Leaving directory '/home/runner/work/cpython/cpython/Doc'
Testing of doctests in the sources finished, look at the results in build/doctest/output.txt
make: *** [Makefile:134: doctest] Error 1
make: Leaving directory '/home/runner/work/cpython/cpython/Doc'

from:
https://github.com/python/cpython/actions/runs/11423310997/job/31782368635?pr=125719
https://github.com/python/cpython/actions/runs/11424088507/job/31784009966?pr=125750
https://github.com/python/cpython/actions/runs/11423945175/job/31783706551?pr=125748
https://github.com/python/cpython/actions/runs/11424088507/job/31784009966?pr=125750
https://github.com/python/cpython/actions/runs/11425133485/job/31786988131?pr=125752

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

[Damien-Chen]

I encountered the same problem, and I noticed that others PR cannot pass the check as well.
I switch the runner image of doctest to ubuntu-24.04, and get the pass result.
I guess maybe there is some version misalign.

[Damien-Chen]

BTW, please pull and rebase before testing.

[rruuaanng]

How should I implement it specifically? Have you solved the problem?

[Damien-Chen]

I tested it on my branch here, but the result is difference between my branch and my PR check.

[rruuaanng]

But this is just your branch. It seems that we cannot modify the CI server of the main branch.

[Damien-Chen]

Yes you are right, so I abort all modification and use original CI yml file to test again, and the result is pass(attached in my last comment).

[rruuaanng]

So what should I do in this situation? You should go to those links to review.

[Damien-Chen]

Yes I have the same problem as you, and the error message from log are all identical with me, so I create another branch on my repo and run all test as same with PR.
Maybe you can run all test on your another test branch to check result.

[rruuaanng]

I mean, how can I eliminate this error and get it to pass CI? If you find a solution, you should review it in my list above.

[hugovk]

For some reason it can't find blurb when running blurb help, even though the previous step had created a venv: The venv has been created in the ./venv directory.

The last passing build is: https://github.com/python/cpython/actions/runs/11422034235/job/31779554757?pr=125739

The first failing build is: https://github.com/python/cpython/actions/runs/11422219191/job/31779951386?pr=125571

[rruuaanng]

What should we do about this problem? From the list I made, it seems that I'm not the only one who has this problem :-(

[hugovk]

We should figure out the cause and fix it :)

I've confirmed it's not caused by yesterday's release of blurb 1.3.0 (https://github.com/python/blurb/releases/tag/v1.3.0) and also not by yesterday's bump of the min Sphinx version to 7.2.6 (2bb7ab7).