[Reproducible-builds] Bug#792965: fastforward: please make the build reproducible

[Maria Valentina Marin]

Source: fastforward
Version: 1:0.51-3
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 fastforward 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 -u fastforward-0.51/debian/changelog fastforward-0.51/debian/changelog
--- fastforward-0.51/debian/changelog
+++ fastforward-0.51/debian/changelog
@@ -1,3 +1,10 @@
+fastforward (1:0.51-3.1) 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 22:09:07 +0200
+
 fastforward (1:0.51-3) unstable; urgency=low
 
   * debian/rules: install the fastforward's newaliases program as
diff -u fastforward-0.51/debian/rules fastforward-0.51/debian/rules
--- fastforward-0.51/debian/rules
+++ fastforward-0.51/debian/rules
@@ -7,6 +7,8 @@
 
 DIR=$(shell pwd)/debian/fastforward
 
+BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)
+
 patch: deb-checkdir patch-stamp
 patch-stamp:
 	for i in `ls -1 debian/diff/*.diff || :`; do \
@@ -70,6 +72,8 @@
 binary-arch: install fastforward.deb
 	dpkg-shlibdeps '$(DIR)'/usr/bin/* '$(DIR)'/usr/sbin/*
 	dpkg-gencontrol -isp -pfastforward -P'$(DIR)'
+	find '$(DIR)' -newermt '$(BUILD_DATE)' -print0 | \
+		xargs -0r touch --no-dereference --date='$(BUILD_DATE)'
 	dpkg -b '$(DIR)' ..
 binary-indep: