[Reproducible-builds] Bug#793004: debdelta: please make the build reproducible

[Maria Valentina Marin]

Source: debdelta
Version: 0.55
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the “reproducible builds” effort [1], we have noticed
that debdelta 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.

Cheers,
akira

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



-------------- next part --------------
diff -Nru debdelta-0.55/debian/changelog debdelta-0.55+nmu1/debian/changelog
--- debdelta-0.55/debian/changelog	2014-11-30 18:31:13.000000000 +0100
+++ debdelta-0.55+nmu1/debian/changelog	2015-07-17 17:14:11.000000000 +0200
@@ -1,3 +1,10 @@
+debdelta (0.55+nmu1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output 
+
+ -- akira <marivalenm at gmail.com>  Fri, 17 Jul 2015 17:13:55 +0200
+
 debdelta (0.55) unstable; urgency=medium
 
   * update git location
diff -Nru debdelta-0.55/debian/rules debdelta-0.55+nmu1/debian/rules
--- debdelta-0.55/debian/rules	2014-11-30 18:31:13.000000000 +0100
+++ debdelta-0.55+nmu1/debian/rules	2015-07-17 17:13:52.000000000 +0200
@@ -5,6 +5,8 @@
 
 D = debian/debdelta
 
+BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)
+
 docdir = $(D)/usr/share/doc/$(package)
 mandir = $(D)/usr/share/man/man1/
 
@@ -58,6 +60,8 @@
 	# build package
 	dpkg-gencontrol -Pdebian/debdelta-doc -pdebdelta-doc
 	chown -R root:root $(D2)
+	find debian/debdelta-doc -newermt '$(BUILD_DATE)' -print0 | \
+		xargs -0r touch --no-dereference --date='$(BUILD_DATE)'
 	dpkg-deb --build $(D2) ..
 
 binary-arch:	checkroot build
@@ -102,6 +106,8 @@
 	dpkg-shlibdeps $(D)/usr/lib/debdelta/minigzip  $(D)/usr/lib/debdelta/minibzip2
 	dpkg-gencontrol -Pdebian/debdelta -pdebdelta
 	chown -R root:root $(D)
+	find debian/debdelta -newermt '$(BUILD_DATE)' -print0 | \
+		xargs -0r touch --no-dereference --date='$(BUILD_DATE)'
 	dpkg-deb --build $(D) ..
 
 define checkdir