Bug#990339: matplotlib: reproducible builds: embeds current year in documentation

[Vagrant Cascadian]

Source: matplotlib
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The build date is embedded in copyright statements in various .html
documentation:

  https://tests.reproducible-builds.org/debian/rb-pkg/bullseye/amd64/diffoscope-results/matplotlib.html

  ./usr/share/doc/python-matplotlib-doc/html/users/whats_new_old.html

  ©·Copyright·2021·-·2012·John·Hunter...·2012·-·2021·The·Matplotlib·development·team.
  vs.
  ©·Copyright·2021·-·2012·John·Hunter...·2012·-·2022·The·Matplotlib·development·team.

The attached patch fixes this by patching doc/conf.py to respect
SOURCE_DATE_EPOCH, which is set by dpkg during package builds.


Arguably, dynamically generating the copyright dates during the build is
not correct behavior; no new copyrighted material was generated as a
result of the building at a later date.


This patch does not fix all reproducibility issues in matplotlib, but it
should reduce the overall diff.


Thanks for maintaining matplotlib!


live well,
  vagrant
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