[Reproducible-builds] Bug#793698: magicfilter: please make the mtimes reproducible

[Maria Valentina Marin]

Source: magicfilter
Version: 1.2-64
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 magicfilter 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/777448

Cheers,
akira

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

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diff -Nru magicfilter-1.2/debian/changelog magicfilter-1.2/debian/changelog
--- magicfilter-1.2/debian/changelog	2011-09-17 05:40:00.000000000 +0200
+++ magicfilter-1.2/debian/changelog	2015-07-24 11:43:07.000000000 +0200
@@ -1,3 +1,10 @@
+magicfilter (1.2-64.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm at gmail.com>  Fri, 24 Jul 2015 11:40:34 +0200
+
 magicfilter (1.2-64) unstable; urgency=low
 
   * debian/rules: Use -Os, *not* -0s. Tks Matthias Klose. Closes: #625174.
diff -Nru magicfilter-1.2/debian/rules magicfilter-1.2/debian/rules
--- magicfilter-1.2/debian/rules	2011-09-17 05:09:14.000000000 +0200
+++ magicfilter-1.2/debian/rules	2015-07-24 14:12:35.000000000 +0200
@@ -12,6 +12,8 @@
 CFLAGS = -Wall -g
 LDFLAGS=
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 ifneq (,$(filter noopt,$(DEB_BUILD_OPTIONS)))
   CFLAGS += -O0
 else
@@ -75,6 +77,8 @@
 	chmod 644 $(tmp)/DEBIAN/conffiles
 	chown -R root.root $(tmp)
 	chmod -R g-ws,og=rX $(tmp)
+	find debian/tmp -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg --build $(tmp) ..
 	chmod a+r debian/files
 
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