From 1f1dce740ec271b21d88fcad7c7b40ea2e57a2d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rapha=C3=ABl=20Hertzog?= <hertzog@debian.org>
Date: Mon, 20 Nov 2017 22:03:38 +0100
Subject: [PATCH] Use $SOURCE_DATE_EPOCH when updating timestamps of manual
 pages

This makes the package reproducible at build time.

Closes: #879169
---
 debian/changelog               | 8 ++++++++
 manpages/bin/update-version.sh | 8 ++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 544297f6f..81dee65c4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+live-build (1:20170921) UNRELEASED; urgency=medium
+
+  * Use $SOURCE_DATE_EPOCH when updating timestamps of manual pages in order
+    to make the package reproducible at build time. Closes: #879169
+    Thanks to Chris Lamb <lamby@debian.org> for the patch.
+
+ -- Raphaël Hertzog <hertzog@debian.org>  Mon, 20 Nov 2017 22:02:22 +0100
+
 live-build (1:20170920) unstable; urgency=medium
 
   * Auto-update version strings in manual pages.
diff --git a/manpages/bin/update-version.sh b/manpages/bin/update-version.sh
index d1d699429..53c440be9 100755
--- a/manpages/bin/update-version.sh
+++ b/manpages/bin/update-version.sh
@@ -13,11 +13,11 @@ set -e
 PROGRAM="LIVE\\\-BUILD"
 VERSION="$(cd .. && dpkg-parsechangelog -S Version)"
 
-DATE="$(LC_ALL=C date +%Y\\\\-%m\\\\-%d)"
+DATE="$(LC_ALL=C date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y\\\\-%m\\\\-%d)"
 
-DAY="$(LC_ALL=C date +%d)"
-MONTH="$(LC_ALL=C date +%m)"
-YEAR="$(LC_ALL=C date +%Y)"
+DAY="$(LC_ALL=C date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%d)"
+MONTH="$(LC_ALL=C date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%m)"
+YEAR="$(LC_ALL=C date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y)"
 
 echo "Updating version headers..."