[Reproducible-builds] Bug#804729: pbuilder: please make the build reproducible

[Reiner Herrmann]

Source: pbuilder
Version: 0.219
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: randomness
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that pbuilder could not be built reproducibly.
The PDF documentation is varying in the /ID field (but not the Creation/Modification
time fields). After some debugging I found out that dblatex (which generates
the tex file that is used to build the pdf), is building the documentation
in a random directory.
Since our pdflatex honours SOURCE_DATE_EPOCH, the Creation/Modification times
did not differ. But the absolute source file path (which is random) is also
part of the /ID calculation.

The attached patch fixes the unreproducibility by telling dblatex to build in
a deterministic path.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds

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