Sphinx 3.5 says "copying static files... failed" and "WARNING: cannot copy static file FileNotFoundError(2, 'No such file or directory')"

[lsaffre]

Describe the bug
After upgrading to Sphinx 3.5, sphinx-build says "copying static files... failed" and "WARNING: cannot copy static file FileNotFoundError(2, 'No such file or directory')" in some of my repositories. I guess that something has changed or become more severe and that my configs need some change... but what change? The warning is not helpful.

To Reproduce
Steps to reproduce the behavior:

$ git clone https://github.com/lino-framework/cg.git
$ cd cg
$ pip install sphinx atelier lino
$ inv bd

Output:

Invoke sphinx-build -b html -T -d /home/luc/tmp/a/cg/docs/.build/.doctrees -W --keep-going . /home/luc/tmp/a/cg/docs/.build
Running Sphinx v3.5.0
...
build succeeded.
The HTML pages are in .build.

Invoke sphinx-build -b html -T -D language=de -A language=de -d /home/luc/tmp/a/cg/docs/.build/de/.doctrees -W --keep-going . /home/luc/tmp/a/cg/docs/.build/de
Running Sphinx v3.5.0
loading translations [de]... done
making output directory... done
...
copying images... [100%] lino/14.png                                                                                                                                          
copying static files... failed
WARNING: cannot copy static file FileNotFoundError(2, 'No such file or directory')
copying extra files... done
dumping search index in German (code: de)... done
dumping object inventory... done
build finished with problems, 1 warning.

Environment info

• OS: Ubuntu Bionic
• Python version: 3.6.8
• Sphinx version: 3.5.0

About this project
I maintain a few dozen of Sphinx doctrees in different repositories. I have similar errors in several (but not all) of my repositories. This particular project is the source code of https://community.lino-framework.org

[jfbu]

I reproduce the issue with Python 3.6.8, but not with 3.7.5 nor with 3.8.7. Also, the issue arises when building for either French or German versions, not English, as I determined by issueing separated build commands directly (rather than via inv bd)

side note: at my old mac os, the build of Pillow fails with missing library error during gcc execution. So I commented out two lines from docs/conf.py.

-extensions += ['lino.sphinxcontrib.logo']
-extensions += ['lino.sphinxcontrib.base']  # for tcname
+# extensions += ['lino.sphinxcontrib.logo']
+# extensions += ['lino.sphinxcontrib.base']  # for tcname

only to be able to test and as this reproduced the same error message you reported I decided to include this information.

[jfbu]

I reproduce the issue with Python 3.6.8, but not with 3.7.5 nor with 3.8.7. Also, the issue arises when building for either French or German versions, not English, as I determined by issueing separated build commands directly (rather than via inv bd)

arrrgggh sorry. In fact my virtual environments for Python 3.7 and 3.8 had an editable install of Sphinx from a clone of the repo. Whereas the Python 3.6 environment has a "pip install sphinx". So maybe there is packaging problem.

Sorry again for misleading information.

[jfbu]

The pip packaged Sphinx is lacking sphinx/search/minified-js directory, it only has sphinx/search/non-minified-js. I see now some other issues have been raised to this effect...

cf #8886

[lsaffre]

Indeed now that you mentioned it: the error happens in all my non-english doctrees!
I didn't yet investigate further into this, I just switched back to Sphinx<3.5 because I am a bit in a hurry with other projects. If it helps you, I can install a clone of Sphinx and test with unreleased Sphinx versions. But otherwise I am okay to wait for the next PyPI release.

[jfbu]

marking this as duplicate of #8884 even though you reported first :-) over there the discussion does not have my misleading comments due to me testing not with the PyPI packaging except with Python 3.6 so I am adding the #8884 link here to re-direct people. Thanks and sorry...

[tk0miya]

I believe this is fixed now by #8886. Thank you for reporting as always!