[Reproducible-builds] Bug#793725: supercat: please make the mtimes reproducible

[Maria Valentina Marin]

Source: supercat
Version: 0.5.5-4
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 supercat 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/777396

Cheers,
akira

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

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diff -Nru supercat-0.5.5/debian/changelog supercat-0.5.5/debian/changelog
--- supercat-0.5.5/debian/changelog	2009-12-17 04:02:04.000000000 +0100
+++ supercat-0.5.5/debian/changelog	2015-07-26 10:37:56.000000000 +0200
@@ -1,3 +1,10 @@
+supercat (0.5.5-4.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix mtimes before building binary packages to produce reproducible output
+
+ -- akira <marivalenm at gmail.com>  Sun, 26 Jul 2015 10:37:46 +0200
+
 supercat (0.5.5-4) unstable; urgency=low
 
   * debian/rules, debian/control:
diff -Nru supercat-0.5.5/debian/rules supercat-0.5.5/debian/rules
--- supercat-0.5.5/debian/rules	2009-12-17 04:02:04.000000000 +0100
+++ supercat-0.5.5/debian/rules	2015-07-26 10:37:40.000000000 +0200
@@ -4,6 +4,8 @@
 DEB_HOST_GNU_TYPE   ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
 DEB_BUILD_GNU_TYPE  ?= $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
 
+export SOURCE_DATE_EPOCH = $(shell date -d "$$(dpkg-parsechangelog --count 1 -SDate)" +%s)
+
 # Package name
 PACKAGE_NAME = supercat
 
@@ -95,6 +97,8 @@
 	cd $(PACKAGE_DIR) && ls etc/$(PACKAGE_NAME)/*|sed 's|^|/|' > DEBIAN/conffiles
 	cd $(PACKAGE_DIR) && find * -type f ! -regex '^DEBIAN/.*' -print0 | xargs -r0 md5sum > DEBIAN/md5sums
 	dpkg-gencontrol -p$(PACKAGE_NAME) -P$(PACKAGE_DIR)
+	find $(PACKAGE_DIR) -newermt "@$$SOURCE_DATE_EPOCH" -print0 | \
+		xargs -0r touch --no-dereference --date="@$$SOURCE_DATE_EPOCH"
 	dpkg-deb --build $(PACKAGE_DIR) ..
 
 binary: binary-indep binary-arch
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