Bug#976348: debian-faq: reproducible builds: Embedded timestamps in PDF files

[Vagrant Cascadian]

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

Several PDFs shipped in various debian-faq packages embed the build date:

  https://tests.reproducible-builds.org/debian/rb-pkg/bullseye/amd64/diffoscope-results/debian-faq.html
  
  /usr/share/doc/debian/FAQ/debian-faq.de.pdf.gz
  2 	5.·Januar·2022          2 	3.·Dezember·2020

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/

live well,
  vagrant

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