From 4eea36b1eb11f8b1a5629ee7a44c4e0b61ee643e Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Sun, 15 Mar 2015 19:37:54 +0000
Subject: Add support for reproducible builds

---
 debian/changelog                                   | 10 ++++
 ...configure.ac-to-allow-external-build_date.patch | 62 ++++++++++++++++++++++
 debian/patches/series                              |  1 +
 debian/rules                                       |  2 +
 4 files changed, 75 insertions(+)
 create mode 100644 debian/patches/02-patch-configure.ac-to-allow-external-build_date.patch

diff --git a/debian/changelog b/debian/changelog
index 63df3c8..472cd04 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,13 @@
+wavemon (0.7.6-3) UNRELEASED; urgency=medium
+
+  * Add support for reproducible builds
+    - d/patches: Added
+       02-patch-configure.ac-to-allow-external-build_date.patch (sent and
+       accepted upstream)
+    - d/rules: parse and export BUILD_DATE from changelog entry
+
+ -- Jonathan McCrohan <jmccrohan@gmail.com>  Sun, 15 Mar 2015 18:21:23 +0000
+
 wavemon (0.7.6-2) unstable; urgency=medium
 
   * d/patches: Drop 01-remove-extra-copyright-file.patch; replace with
diff --git a/debian/patches/02-patch-configure.ac-to-allow-external-build_date.patch b/debian/patches/02-patch-configure.ac-to-allow-external-build_date.patch
new file mode 100644
index 0000000..6026187
--- /dev/null
+++ b/debian/patches/02-patch-configure.ac-to-allow-external-build_date.patch
@@ -0,0 +1,62 @@
+From b951f6292f74edd114a403b6be8752070c8d819f Mon Sep 17 00:00:00 2001
+From: Jonathan McCrohan <jmccrohan@gmail.com>
+Date: Thu, 12 Mar 2015 15:21:58 -0700
+Subject: [PATCH] configure.ac: Support external BUILD_DATE values
+
+Support reproducible builds [1] by allowing build systems to pass in an
+external value for BUILD_DATE.
+
+autoreconf has been run to resync configure with configure.ac changes.
+
+[1] https://wiki.debian.org/ReproducibleBuilds
+
+Signed-off-by: Jonathan McCrohan <jmccrohan@gmail.com>
+Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
+---
+ configure    | 8 ++++++++
+ configure.ac | 7 ++++++-
+ 2 files changed, 14 insertions(+), 1 deletion(-)
+
+diff --git a/configure b/configure
+index 082dd99..eeb8115 100755
+--- a/configure
++++ b/configure
+@@ -2186,11 +2186,19 @@ ac_configure="$SHELL $ac_aux_dir/configure"  # Please don't use this var.
+ 
+ ac_config_files="$ac_config_files Makefile"
+ 
++# allow BUILD_DATE to be externally set for build reproducibility
++if test "$BUILD_DATE"; then
++  cat >>confdefs.h <<_ACEOF
++#define BUILD_DATE "$BUILD_DATE"
++_ACEOF
++
++else
+ 
+ cat >>confdefs.h <<_ACEOF
+ #define BUILD_DATE "`/bin/date`"
+ _ACEOF
+ 
++fi
+ 
+ CFLAGS="-O2 -Wall"
+ 
+diff --git a/configure.ac b/configure.ac
+index e50c986..7ae0db9 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -7,8 +7,13 @@ AC_INIT([wavemon], [0.7.6], [gerrit@erg.abdn.ac.uk], [wavemon-current],
+ # Variables
+ AC_CONFIG_AUX_DIR([config])
+ AC_CONFIG_FILES([Makefile])
+-AC_DEFINE_UNQUOTED([BUILD_DATE], ["`/bin/date`"],
++# allow BUILD_DATE to be externally set for build reproducibility
++if test "$BUILD_DATE"; then
++  AC_DEFINE_UNQUOTED(BUILD_DATE, ["$BUILD_DATE"])
++else
++  AC_DEFINE_UNQUOTED([BUILD_DATE], ["`/bin/date`"],
+ 		   [date wavemon was last configured and built])
++fi
+ 
+ CFLAGS="-O2 -Wall"
+ 
diff --git a/debian/patches/series b/debian/patches/series
index 18ef635..3c4f399 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1 +1,2 @@
 01-patch-makefile.in-to-not-install-docs.patch
+02-patch-configure.ac-to-allow-external-build_date.patch
diff --git a/debian/rules b/debian/rules
index 14f6997..342fdcc 100755
--- a/debian/rules
+++ b/debian/rules
@@ -2,5 +2,7 @@
 
 export DEB_CFLAGS_MAINT_APPEND=-pthread
 
+export BUILD_DATE = $(shell LC_ALL=C date -u --date="`dpkg-parsechangelog -SDate`")
+
 %:
 	dh $@ --with autotools_dev
-- 
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