Bug#978577: coinor-symphony: reproducible builds: Embedded timestamps in PDF files

[Vagrant Cascadian]

Source: coinor-symphony
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 timestamp is embedded in /usr/share/doc/coinor-libsymphony-doc/man.pdf.gz:

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

  November·29,·2020
  vs.
  January·2,·2022

The attached patch fixes this by setting FORCE_SOURCE_DATE=1 in
debian/rules, which texlive needs in order to respect SOURCE_DATE_EPOCH,
which is set during debian package builds to the timestamp in the latest
debian/changelog entry.

  https://reproducible-builds.org/docs/source-date-epoch/

While this alone does not fix all reproducibility issues in
coinor-symphony (e.g. build paths), it should be reproducible once it
lands in bullseye, which does not vary build paths in the reproducible
builds test infrastructure.

Thanks for maintaining coinor-symphony!

live well,
  vagrant
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