Bug#1024007: haskell98-report: reproducible builds: timestamp embedded in .ps files

[Vagrant Cascadian]

Source: haskell98-report
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 time was embedded in several .ps files:

  https://tests.reproducible-builds.org/debian/rb-pkg/bookworm/amd64/diffoscope-results/haskell98-report.html

  /usr/share/doc/haskell98-report/ffi.ps.gz

  %DVIPSSource:··TeX·output·2023.12.08:1504
  vs.
  %DVIPSSource:··TeX·output·2022.11.06:1057

The attached patch to debian/rules fixes this by setting the
FORCE_SOURCE_DATE environment variable, which ensures that texlive
respects SOURCE_DATE_EPOCH to set the timestamp.

According to my local tests, with this patch applied, haskell98-report should
build reproducibly on tests.reproducible-builds.org!

Thanks for maintaining haskell98-report!

live well,
  vagrant
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