#!/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/>.
#

declare -r myname='checkupdates'
declare -r myver='@PACKAGE_VERSION@'

m4_include(../scripts/library/output_format.sh)
m4_include(../scripts/library/term_colors.sh)

if (( $# > 0 )); then
	echo "${myname} (pacman) v${myver}"
	echo
	echo "Safely print a list of pending updates"
	echo
	echo "Usage: ${myname}"
	echo
	echo 'Note: Export the "CHECKUPDATES_DB" variable to change the path of the temporary database.'
	exit 0
fi

if ! type -P fakeroot >/dev/null; then
	error 'Cannot find the fakeroot binary.'
	exit 1
fi

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

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

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

mkdir -p "$CHECKUPDATES_DB"
ln -s "${DBPath}/local" "$CHECKUPDATES_DB" &> /dev/null
fakeroot pacman -Sy --dbpath "$CHECKUPDATES_DB" --logfile /dev/null &> /dev/null
pacman -Qu --dbpath "$CHECKUPDATES_DB" 2> /dev/null | grep -v '\[.*\]'

exit 0

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