[Reproducible-builds] Bug#793724: ssmtp: please make the mtimes reproducible

[Maria Valentina Marin]

Source: ssmtp
Version: 2.64-8
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 ssmtp 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/777398

Cheers,
akira

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

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diff -Nru ssmtp-2.64/debian/changelog ssmtp-2.64/debian/changelog
--- ssmtp-2.64/debian/changelog	2014-07-15 02:49:35.000000000 +0200
+++ ssmtp-2.64/debian/changelog	2015-07-26 10:31:10.000000000 +0200
@@ -1,3 +1,10 @@
+ssmtp (2.64-8.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm at gmail.com>  Sun, 26 Jul 2015 10:30:50 +0200
+
 ssmtp (2.64-8) unstable; urgency=medium
 
   * Fix "Partial loss of message body, sending message to wrong recipicients".
diff -Nru ssmtp-2.64/debian/rules ssmtp-2.64/debian/rules
--- ssmtp-2.64/debian/rules	2014-04-11 19:44:32.000000000 +0200
+++ ssmtp-2.64/debian/rules	2015-07-26 10:30:43.000000000 +0200
@@ -12,6 +12,8 @@
 CC=gcc
 CFLAGS+=-O2 -g -Wall
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 do_cfg:
 	test -f Makefile || ./configure --exec-prefix="/usr" --prefix="" --enable-ssl --enable-inet6 --enable-md5auth --with-cflags="$(CFLAGS)"
 
@@ -75,7 +77,8 @@
 	
 	install -d -m 755 debian/tmp/usr/share/lintian/overrides/
 	install -m 644 debian/ssmtp.lintian debian/tmp/usr/share/lintian/overrides/ssmtp
-
+	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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