[Reproducible-builds] Bug#792954: dpatch: please make the build reproducible

[Maria Valentina Marin]

Source: dpatch
Version: 2.0.35
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the “reproducible builds” effort [1], we have noticed
that dpatch could not be built reproducibly.

The attached patch sets the mtimes of all files which are modified
during the built to the date of the last changelog entry in order to
produce files with reproducible metadata.

Cheers,
akira

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


-------------- next part --------------
diff -Nru dpatch-2.0.35/debian/changelog dpatch-2.0.35+nmu1/debian/changelog
--- dpatch-2.0.35/debian/changelog	2012-02-07 10:09:06.000000000 +0100
+++ dpatch-2.0.35+nmu1/debian/changelog	2015-07-17 17:32:07.000000000 +0200
@@ -1,3 +1,10 @@
+dpatch (2.0.35+nmu1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm at gmail.com>  Fri, 17 Jul 2015 17:31:49 +0200
+
 dpatch (2.0.35) unstable; urgency=low
 
   * Mark the package Multi-Arch: foreign, thanks Riku Voipio
diff -Nru dpatch-2.0.35/debian/rules dpatch-2.0.35+nmu1/debian/rules
--- dpatch-2.0.35/debian/rules	2011-10-23 23:17:10.000000000 +0200
+++ dpatch-2.0.35+nmu1/debian/rules	2015-07-17 17:31:46.000000000 +0200
@@ -9,6 +9,8 @@
 
 DOCS		= README.History README.source README.svn-mergeWithUpstream
 
+BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)
+
 build-dpatch:
 	test -e debian/control
 	${MAKE}
@@ -72,6 +74,8 @@
 	find ${DPATCH} -type f -name '*.gz' | xargs chmod 0644
 	find ${DPATCH}/DEBIAN -type f | xargs chmod 0644
 	dpkg-gencontrol -isp -P${DPATCH}
+	find ${DPATCH} -newermt '$(BUILD_DATE)' -print0 | \
+		xargs -0r touch --no-dereference --date='$(BUILD_DATE)'
 	dpkg --build ${DPATCH} ..
 
 binary-indep: binary-dpatch