[Reproducible-builds] [debhelper] 01/07: dh_fixmtimes: introduce new helper to fix mtimes for reproducibility

[Jérémy Bobbio]

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lunar pushed a commit to branch pu/reproducible_builds
in repository debhelper.

commit 7a61549b6313d31c5a97fff46367cd5188804f92
Author: Jérémy Bobbio <lunar at debian.org>
Date:   Fri Aug 29 03:46:09 2014 +0000

    dh_fixmtimes: introduce new helper to fix mtimes for reproducibility
    
    To enable reproducible builds, file modification times written in binary
    packages should be the same accross multiple builds of the same source
    package. This helper will change the modification time of any file that
    has been created later than the time of the latest debian/changelog
    entry to the time of the latest debian/changelog entry.
    
    See https://wiki.debian.org/ReproducibleBuilds for more information on
    reproducible builds in Debian.
---
 Debian/Debhelper/Dh_Lib.pm |  4 ++-
 dh                         |  1 +
 dh_fixmtimes               | 76 ++++++++++++++++++++++++++++++++++++++++++++++
 man/po4a/po4a.cfg          |  1 +
 4 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/Debian/Debhelper/Dh_Lib.pm b/Debian/Debhelper/Dh_Lib.pm
index 6a79c9c..44c3ced 100644
--- a/Debian/Debhelper/Dh_Lib.pm
+++ b/Debian/Debhelper/Dh_Lib.pm
@@ -477,7 +477,8 @@ sub pkgfilename {
 }
 
 # Returns 1 if the package is a native debian package, null otherwise.
-# As a side effect, sets $dh{VERSION} to the version of this package.
+# As a side effect, sets $dh{VERSION} to the version of this package,
+# and $dh{DATE} to the date of the latest changelog entry.
 {
 	# Caches return code so it only needs to run dpkg-parsechangelog once.
 	my %isnative_cache;
@@ -499,6 +500,7 @@ sub pkgfilename {
 		if (! defined $dh{VERSION}) {
 			error("changelog parse failure");
 		}
+		($dh{DATE})=$version=~m/Date:\s*(.*)/m;
 
 		# Is this a native Debian package?
 		if ($dh{VERSION}=~m/.*-/) {
diff --git a/dh b/dh
index f3bd321..fc300b8 100755
--- a/dh
+++ b/dh
@@ -408,6 +408,7 @@ my @b=qw{
 	dh_installdeb
 	dh_gencontrol
 	dh_md5sums
+	dh_fixmtimes
 	dh_builddeb
 };
 $sequences{clean} = [qw{
diff --git a/dh_fixmtimes b/dh_fixmtimes
new file mode 100755
index 0000000..28122c7
--- /dev/null
+++ b/dh_fixmtimes
@@ -0,0 +1,76 @@
+#!/usr/bin/perl -w
+
+=encoding utf-8
+
+=head1 NAME
+
+dh_fixperms - fix mtimes of files in package build directories
+
+=cut
+
+use strict;
+use Config;
+use Debian::Debhelper::Dh_Lib;
+
+=head1 SYNOPSIS
+
+B<dh_fixmtimes> [S<I<debhelper options>>] [B<-X>I<item>]
+
+=head1 DESCRIPTION
+
+B<dh_fixmtimes> is a debhelper program that is responsible for setting the
+modification times of files and directories in package build directories to
+a state easily reproducible accross multiple builds.
+
+B<dh_fixperms> will examine the modification time of all files in the package
+build directory. If the file is newer than the date of the latest
+debian/changelog entry, we assume the file is a result of a build, and its
+modification time will be set to the date of the latest debian/changelog entry.
+
+This removes unneeded variations accross builds of the same package.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-X>I<item>, B<--exclude> I<item>
+
+Exclude files that contain I<item> anywhere in their filename from having
+their modification times changed. You may use this option multiple times to
+build up a list of things to exclude.
+
+=back
+
+=cut
+
+init();
+
+foreach my $package (@{$dh{DOPACKAGES}}) {
+	my $tmp=tmpdir($package);
+
+	# XXX: not nice, we only run this for the side effect of getting $dh{DATE} set
+	isnative($package);
+
+	my $timestamp=`date -d'$dh{DATE}' +%s`;
+	chomp $timestamp;
+
+	my $find_options='';
+	if (defined($dh{EXCLUDE_FIND}) && $dh{EXCLUDE_FIND} ne '') {
+		$find_options="! \\( $dh{EXCLUDE_FIND} \\)";
+	}
+
+	complex_doit("find $tmp -newermt '$dh{DATE}' $find_options -print0",
+		"2>/dev/null | xargs -0r touch --no-dereference --date='$dh{DATE}'");
+}
+
+=head1 SEE ALSO
+
+L<debhelper(7)>
+
+This program is a part of debhelper.
+
+=head1 AUTHOR
+
+Jérémy Bobbio <lunar at debian.org>
+
+=cut
diff --git a/man/po4a/po4a.cfg b/man/po4a/po4a.cfg
index 311762f..39e3876 100644
--- a/man/po4a/po4a.cfg
+++ b/man/po4a/po4a.cfg
@@ -17,6 +17,7 @@
 [type: pod] dh_compress 	$lang:man/$lang/dh_compress.pod		add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
 [type: pod] dh_desktop		$lang:man/$lang/dh_desktop.pod		add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
 [type: pod] dh_fixperms 	$lang:man/$lang/dh_fixperms.pod		add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
+[type: pod] dh_fixmtimes	$lang:man/$lang/dh_fixmtimes.pod	add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
 [type: pod] dh_gconf 		$lang:man/$lang/dh_gconf.pod		add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
 [type: pod] dh_gencontrol 	$lang:man/$lang/dh_gencontrol.pod	add_fr:man/po4a/add.fr	add_es:man/po4a/add1.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt
 [type: pod] dh_icons		$lang:man/$lang/dh_icons.pod		add_fr:man/po4a/add.fr	add_es:man/po4a/add3.es  add_de:man/po4a/add.de  add_pt:man/po4a/add.pt

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