[Python-modules-team] Bug#948729: python3-sphinx: Sphinx breaks with docutils 0.16~rc1

[Sandro Knauß]

Package: python3-sphinx
Version: 1.8.5-4
Severity: important
Tags: upstream patch sid
Control: affects -1 nextcloud-desktop
Control: forwarded -1 https://github.com/sphinx-doc/sphinx/issues/6887

Hey,

Sphinx is currently unusable to build documentation anymore. As always sphinx breaks with:
https://buildd.debian.org/status/fetch.php?pkg=nextcloud-desktop&arch=amd64&ver=2.6.2-1&stamp=1578830658&raw=0

Exception occurred:
  File "/usr/lib/python3/dist-packages/sphinx/util/nodes.py", line 97, in apply_source_workaround
    for classifier in reversed(node.parent.traverse(nodes.classifier)):
TypeError: '_traversal_list' object is not reversible
The full traceback has been saved in /tmp/sphinx-err-lppsk4sf.log, if you want to report the issue to the developers.

The upstream bugreport issues/6887 tell, that this was caused by the upload of docutils 1.6.1~rc1.

Upstream has already a patch to fix this:
https://github.com/sphinx-doc/sphinx/pull/6918

hefee


-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'oldstable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=en_US (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-sphinx depends on:
ii  python3            3.7.5-3
ii  python3-alabaster  0.7.8-1
ii  python3-babel      2.6.0+dfsg.1-1
ii  python3-distutils  3.8.0-1
ii  python3-docutils   0.15.2+dfsg-2
ii  python3-imagesize  1.2.0-1
ii  python3-jinja2     2.10.1-1
ii  python3-lib2to3    3.8.0-1
ii  python3-packaging  19.1-2
ii  python3-pygments   2.3.1+dfsg-1
ii  python3-requests   2.22.0-2
ii  python3-six        1.13.0-1
ii  sphinx-common      1.8.5-4

Versions of packages python3-sphinx recommends:
ii  make         4.2.1-1.2
ii  python3-pil  7.0.0-2

Versions of packages python3-sphinx suggests:
pn  dvipng                     <none>
ii  imagemagick-6.q16          8:6.9.10.23+dfsg-2.1+b2
pn  latexmk                    <none>
ii  libjs-mathjax              2.7.4+dfsg-1
ii  python3-sphinx-rtd-theme   0.4.3+dfsg-2
pn  python3-stemmer            <none>
pn  sphinx-doc                 <none>
ii  texlive-fonts-recommended  2019.20191208-4
ii  texlive-latex-extra        2019.20191208-1
ii  texlive-latex-recommended  2019.20191208-4
ii  texlive-plain-generic      2019.20191208-1

-- no debconf information