Problem with 1.7.5 on Travis CI ("No module named roman")

[randombit]

Running Sphinx v 1.7.5 on Travis I am seeing this error:

"Could not import extension sphinx.builders.latex (exception: No module named roman)"

Ubuntu 14.04 ships with a very old version of Sphinx (it has problems parsing the C++ declarations in my docs) so my CI script installs a new version of Sphinx via pip.

        sudo apt-get -qq update
        sudo apt-get install doxygen python-docutils
        sudo apt-get remove python-requests python-openssl
        sudo pip install requests pyopenssl
        sudo pip install sphinx

The removal/reinstall of requests and python-openssl is to workaround the bug described in
https://stackoverflow.com/questions/32779919/no-module-named-for-requests

We are not actually trying to build a PDF during CI, but it looks like the missing module causes sphinx-build to exit with a non-zero error code which causes the whole build to fail.

Something I do not understand about this error is that the Ubuntu python-roman package is already installed (it is a dependency of python-docutils).

Error logs / results

https://travis-ci.org/randombit/botan/jobs/384926972

In the build logs the pip/apt-get operations are run from the subscript ./src/scripts/ci/setup_travis.sh at line 474

Expected results

Version 1.7.4 and earlier work fine. I only investigated this after my build suddenly broke. After I set pip to install ==1.7.4 my build worked again https://travis-ci.org/randombit/botan/builds/384949254

Reproducible project / your project

• The branch https://github.com/randombit/botan/tree/fix-docs-build strips out all the non-docs CI builds so should be easy to reproduce the problem.

Environment info

• OS: Ubuntu 14.04 (Travis CI)
• Python version: 2.7.5
• Sphinx version: 1.7.5

Let me know if there is any additional info I can provide, and thanks for this great tool.

[tk0miya]

OMG... It seems python-docutils package on Debian/Ubuntu is modified by package maintainers.
It does not provide docutils.utils.roman package...

Docutils installed by pip (original):

root@7c121596759e:/# python
Python 2.7.6 (default, Nov 23 2017, 15:49:48)
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import docutils
>>> docutils
<module 'docutils' from '/usr/local/lib/python2.7/dist-packages/docutils/__init__.pyc'>
>>> import docutils.utils.roman
>>> docutils.utils.roman
<module 'docutils.utils.roman' from '/usr/local/lib/python2.7/dist-packages/docutils/utils/roman.pyc'>
>>>

Docutils installed by apt:

root@7c121596759e:/# python
Python 2.7.6 (default, Nov 23 2017, 15:49:48)
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import docutils
>>> docutils
<module 'docutils' from '/usr/lib/python2.7/dist-packages/docutils/__init__.pyc'>
>>> import docutils.utils.roman
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named roman
>>>

I suppose roman.py is redistribution of roman package. So it might have been removed by package maintainer on packaging.

As a workaround, please install it by pip.

[randombit]

Confirmed, uninstalling the Ubuntu python-roman package and installing roman via pip resolves the issue. Thank you! Should I close this issue?

[tk0miya]

Thank you for confirmation. Please keep as is.
This behavior is not good. So I'll work for it later.

[tk0miya]

Fixed by #5024 .
Thank you for reporting.