[Reproducible-builds] Bug#793714: rockdodger: please make the mtimes reproducible

[Maria Valentina Marin]

Source: rockdodger
Version: 1.0.0-2
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 rockdodger 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

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diff -Nru rockdodger-1.0.0/debian/changelog rockdodger-1.0.0/debian/changelog
--- rockdodger-1.0.0/debian/changelog	2015-06-07 18:58:57.000000000 +0200
+++ rockdodger-1.0.0/debian/changelog	2015-07-25 14:25:48.000000000 +0200
@@ -1,3 +1,10 @@
+rockdodger (1.0.0-2.1) 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 14:25:38 +0200
+
 rockdodger (1.0.0-2) unstable; urgency=low
 
   * Fixed reproducible builds, closes: #778205, thanks to Chris Lamb.
diff -Nru rockdodger-1.0.0/debian/rules rockdodger-1.0.0/debian/rules
--- rockdodger-1.0.0/debian/rules	2015-06-07 18:49:12.000000000 +0200
+++ rockdodger-1.0.0/debian/rules	2015-07-25 14:25:36.000000000 +0200
@@ -10,6 +10,8 @@
 MOREOPTS = $(CPPFLAGS) $(CFLAGS) -Wall -Werror
 export MOREOPTS
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 clean:
 	$(testdir)
 	rm -f build-stamp debian/files debian/substvars
@@ -62,6 +64,8 @@
 
 	dpkg-shlibdeps debian/tmp/usr/games/rockdodger
 	dpkg-gencontrol -isp -prockdodger
+	find debian/tmp -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg --build debian/tmp ..
 
 binary-indep:
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