From ce67360bbfffebee5acba1b29c4aeaba1da112b9 Mon Sep 17 00:00:00 2001
From: Carlos Maddela <e7appew@gmail.com>
Date: Thu, 5 Jan 2017 19:17:49 +1100
Subject: [PATCH] Fudge dates and PDF IDs in the interest of build
 reproducibility.

---
 debian/patches/28-fudge-pdf-doc-ids.patch | 27 +++++++++++++++++++++++
 debian/patches/series                     |  1 +
 debian/rules                              |  4 ++++
 3 files changed, 32 insertions(+)
 create mode 100644 debian/patches/28-fudge-pdf-doc-ids.patch

diff --git a/debian/patches/28-fudge-pdf-doc-ids.patch b/debian/patches/28-fudge-pdf-doc-ids.patch
new file mode 100644
index 0000000..c1625c1
--- /dev/null
+++ b/debian/patches/28-fudge-pdf-doc-ids.patch
@@ -0,0 +1,27 @@
+From: Carlos Maddela <e7appew@gmail.com>
+Date: Thu, 5 Jan 2017 19:14:35 +1100
+Subject: Generate the same PDF document IDs for build reproducibility.
+
+Description: Generate the same PDF IDs for build reproducibility.
+Author: Carlos Maddela <e7appew@gmail.com>
+Origin: vendor
+Forwarded: not-needed
+Last-Update: 2016-12-21
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+---
+ documentation/user-manual/manual.tex | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/documentation/user-manual/manual.tex b/documentation/user-manual/manual.tex
+index 60fb51e..aaab4fa 100644
+--- a/documentation/user-manual/manual.tex
++++ b/documentation/user-manual/manual.tex
+@@ -65,6 +65,7 @@
+ \fancyfoot{}
+ \fancyfoot[LE,RO]{page \thepage\ of \pageref{LastPage}}
+ 
++\pdftrailerid{dvdisaster}
+ \begin{document}
+ 
+ \definecolor{lightorange}{RGB}{255,224,150}
diff --git a/debian/patches/series b/debian/patches/series
index 92f39c4..9cc762e 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -19,3 +19,4 @@
 25-fix-man-pages.patch
 26-fix-display-of-manual.pdf.patch
 27-allow-opening-in-browser-again.patch
+28-fudge-pdf-doc-ids.patch
diff --git a/debian/rules b/debian/rules
index 5257910..e85d840 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,6 +6,10 @@ include /usr/share/dpkg/buildflags.mk
 export DEB_CFLAGS_MAINT_APPEND = $(CPPFLAGS) -Wall -Wno-deprecated-declarations -pedantic
 export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 
+export SOURCE_DATE_EPOCH := \
+	$(shell date --date="$$(dpkg-parsechangelog -S Date)" +%s)
+export FORCE_SOURCE_DATE = 1
+
 MUTABLE_FILES := build.h $(wildcard locale/*.po) \
 	documentation/config/version.tex