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fakedate: new package

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`date' is widely used by packages to include build information in their
binaries. Unfortunately, this is incompatible with BR2_REPRODUCIBLE.

Instead of having to identify all `date' invocations in the different
packages, this commit adds a small tool that allows to always return
the same date.

This work was sponsored by `BA Robotic Systems'.

[Peter: drop debugging print]
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Jérôme Pouiller 2016-12-20 14:46:19 +01:00 committed by Peter Korsgaard
parent 76838f6341
commit a268768c71
2 changed files with 72 additions and 0 deletions
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57
package/fakedate/fakedate Executable file
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#!/bin/sh
# vim: set sw=4 expandtab:
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Copyright (C) 2016 Jérôme Pouiller <jezz@sysmic.org>
#
# Sanity check
if ! readlink -f "$0" | grep -q fakedate; then
echo "fakedate: Please name this script \`fakedate'"
exit 1
fi
DATE_BIN=false
# Do not call `date' directly since it will produce an infinite recursion.
# Instead, find path of true `date' binary.
for P in `echo $PATH | tr ':' ' '`; do
if [ -x "$P/date" ]; then
if readlink -f "$P/date" | grep -qv fakedate; then
DATE_BIN="$P/date"
break;
fi
fi
done
if [ -n "$SOURCE_DATE_EPOCH" ]; then
FORCE_EPOCH=1
for i in "$@"; do
# Use of --date, --file and --reference (and their short option counter
# parts) is incompatible with SOURCE_DATE_EPOCH.
# -u and -R are the only short options without argument. So they could
# appear between '-' and option we want to match.
if echo "$i" | grep -qE '^-([uR]*d|-date|[uR]*f|-file|[uR]*r|--reference)'; then
FORCE_EPOCH=0
break;
fi
done
if [ $FORCE_EPOCH -eq 1 ]; then
echo "date: Warning: using \$SOURCE_DATE_EPOCH instead of true time" >&2
exec $DATE_BIN -d "@$SOURCE_DATE_EPOCH" "$@"
fi
fi
exec $DATE_BIN "$@"

15
package/fakedate/fakedate.mk Normal file
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################################################################################
#
# fakedate
#
################################################################################
# source included in buildroot
HOST_FAKEDATE_LICENSE = GPLv2+
define HOST_FAKEDATE_INSTALL_CMDS
$(INSTALL) -D -m 755 package/fakedate/fakedate $(HOST_DIR)/usr/bin/fakedate
ln -sfn fakedate $(HOST_DIR)/usr/bin/date
endef
$(eval $(host-generic-package))