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Bug#793708: nitpic: please make the mtimes reproducible



Source: nitpic
Version: 0.1-15
Severity: wishlist
Tags: patch
User: reproducible-builds@lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-builds@lists.alioth.debian.org

Hi!

While working on the “reproducible builds” effort [1], we have noticed
that nitpic 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/777492

Cheers,
akira

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

diff -u nitpic-0.1/debian/changelog nitpic-0.1/debian/changelog
--- nitpic-0.1/debian/changelog
+++ nitpic-0.1/debian/changelog
@@ -1,3 +1,10 @@
+nitpic (0.1-16) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm@gmail.com>  Fri, 24 Jul 2015 15:12:07 +0200
+
 nitpic (0.1-15) unstable; urgency=medium
 
   * QA upload.
diff -u nitpic-0.1/debian/rules nitpic-0.1/debian/rules
--- nitpic-0.1/debian/rules
+++ nitpic-0.1/debian/rules
@@ -9,6 +9,8 @@
 Makefile: Imakefile
 	xmkmf
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 build: build-arch
 build-indep:
 build-arch: checkdir Makefile
@@ -61,6 +63,8 @@
 endif
 	dpkg-shlibdeps $(d)/usr/bin/*
 	dpkg-gencontrol -isp -p$(package) -P$(d)
+	find $(d) -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg --build $(d) ..
 
 binary:	binary-indep binary-arch

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