[Rsbackup-maint] Bug#793716: rsbackup: please make the mtimes reproducible

[Maria Valentina Marin]

Source: rsbackup
Version: 1.1-4
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 rsbackup 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/777394

Cheers,
akira

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

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diff -u rsbackup-1.1/debian/changelog rsbackup-1.1/debian/changelog
--- rsbackup-1.1/debian/changelog
+++ rsbackup-1.1/debian/changelog
@@ -1,3 +1,10 @@
+rsbackup (1.1-4.1) 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 14:31:43 +0200
+
 rsbackup (1.1-4) unstable; urgency=low
 
   * Patch from Jonathan Wiltshire to use install rather than cp for
diff -u rsbackup-1.1/debian/rules rsbackup-1.1/debian/rules
--- rsbackup-1.1/debian/rules
+++ rsbackup-1.1/debian/rules
@@ -25,6 +25,8 @@
 
 export CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 build-arch: build
 build-indep: build
 build:
@@ -76,6 +78,8 @@
 		-Tdebian/substvars.rsbackup
 	chown -R root:root debian/${PACKAGE}
 	chmod -R g-ws debian/${PACKAGE}
+	find debian/${PACKAGE} -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg --build debian/${PACKAGE} ..
 
 binary: binary-arch binary-indep
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