[Reproducible-builds] Bug#788238: kfreebsd-10: source tarball has unreproducible timestamps

[Steven Chamberlain]

Package: src:kfreebsd-10
Version: 10.1~svn274115-4
Severity: wishlist
Tags: patch pending
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps

Hi,

The kfreebsd-10 (kernel) packaging distributes a source tarball in
kfreebsd-source, a binary arch-indep package.

Some of these files are patched during the build, so the file and
directory timestamps in the tarball are not reproducible.

This patch will clamp timestamps to be no later than the latest
debian/changelog entry (replacing an earlier, incomplete fix).

--- debian/rules        (revision 5714)
+++ debian/rules        (working copy)
@@ -44,6 +44,7 @@
 ORIG_DIR       := $(source)-$(tar_version)
 ORIG_TAR       := $(source)_$(tar_version).orig.tar.xz
 PATH           := /usr/lib/freebsd:$(PATH)
+BUILD_DATE     ?= $(shell dpkg-parsechangelog --show-field=Date)
 
 ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
        NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
@@ -169,8 +170,10 @@
 
        mkdir -p $(SOURCE_PACKAGE)/usr/src
        chown -R root.src $(SRC_DIR)
-       # Avoid the top-level directory timestamp changing
-       touch $(SRC_DIR) --reference=$(SRC_DIR)/sys
+       # Clamp timestamps to be no newer than last changelog entry, see
+       # https://wiki.debian.org/ReproducibleBuilds/TimestampsInTarball
+       find $(SRC_DIR) -newermt "$(BUILD_DATE)" -print0 \
+        | xargs -0r touch --no-dereference --date="$(BUILD_DATE)"
        # Create tarball with files sorted in a stable order, see
        # https://wiki.debian.org/ReproducibleBuilds/FileOrderInTarballs
        find $(SRC_DIR) -print0 | LC_ALL=C sort -z \

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: kfreebsd-amd64 (x86_64)

Kernel: kFreeBSD 9.0-2-amd64-xenhvm-ipsec
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash