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#!/bin/bash
#
#   checkupdates: Safely print a list of pending updates.
#
#   Copyright (c) 2013 Kyle Keen <keenerd@gmail.com>
#
#   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, see <http://www.gnu.org/licenses/>.
#

if (( $# > 0 )); then
	echo "checkupdate: Safely print a list of pending updates."
	echo "Use: checkupdates"
	echo "Export the 'CHECKUPDATE_DB' variable to change the path of the temporary database."
	exit 0
fi

if [[ -z $CHECKUPDATE_DB ]]; then
	CHECKUPDATE_DB="${TMPDIR:-/tmp}/checkup-db-${USER}/"
fi

trap 'rm -f $CHECKUPDATE_DB/db.lck' INT TERM EXIT

DBPath="${DBPath:-@localstatedir@/lib/pacman/}"
eval $(awk -F' *= *' '$1 ~ /DBPath/ { print $1 "=" $2 }' /etc/pacman.conf)

mkdir -p "$CHECKUPDATE_DB"
ln -s "${DBPath}/local" "$CHECKUPDATE_DB" &> /dev/null
fakeroot pacman -Sy --dbpath "$CHECKUPDATE_DB" --logfile /dev/null &> /dev/null
pacman -Qqu --dbpath "$CHECKUPDATE_DB" 2> /dev/null

exit 0

# vim: set ts=2 sw=2 noet: