[Reproducible-builds] Bug#793718: sauce: please make the mtimes reproducible

[Maria Valentina Marin]

Source: sauce
Version: 0.9.0+nmu3
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 sauce 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. Please also consider this
other bug from the reproducible builds team:
https://bugs.debian.org/777401

Cheers,
akira

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

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diff -Nru sauce-0.9.0+nmu3/debian/changelog sauce-0.9.0+nmu4/debian/changelog
--- sauce-0.9.0+nmu3/debian/changelog	2013-10-31 11:42:03.000000000 +0100
+++ sauce-0.9.0+nmu4/debian/changelog	2015-07-25 15:18:55.000000000 +0200
@@ -1,3 +1,10 @@
+sauce (0.9.0+nmu4) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm at gmail.com>  Sat, 25 Jul 2015 15:18:46 +0200
+
 sauce (0.9.0+nmu3) unstable; urgency=low
 
   * Non-maintainer upload.
diff -Nru sauce-0.9.0+nmu3/debian/rules sauce-0.9.0+nmu4/debian/rules
--- sauce-0.9.0+nmu3/debian/rules	2008-03-08 17:29:36.000000000 +0100
+++ sauce-0.9.0+nmu4/debian/rules	2015-07-25 15:18:44.000000000 +0200
@@ -24,6 +24,8 @@
 revision=$(shell dpkg-parsechangelog | sed -n 's/^Version:.*-//p')
 verext=-$(revision)deb
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 build-indep:
 	$(checkdir)
 	rm -f settings
@@ -75,6 +77,8 @@
 	chown -R mail.root debian/tmp/var/{lib,log}/sauce debian/tmp/etc/sauce/*
 	chown root.root debian/tmp/etc/sauce/sys-config
 	chmod -R u+w,go-ws,a+rX debian/tmp
+	find debian/tmp -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg --build debian/tmp ..
 
 define checkdir
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