checkupdates

#!/usr/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='1.4.0'

LIBRARY=${LIBRARY:-'/usr/share/makepkg'}

DOWNLOAD_CACHE=0
USE_COLOR=0

# Import libmakepkg
source "$LIBRARY"/util/message.sh
source "$LIBRARY"/util/parseopts.sh

usage() {
	cat << __EOF__
${myname} v${myver}

Safely print a list of pending updates

Usage: ${myname} [options]

  Options:
    -d, --download        download pending updates to the pacman cache.
    -h, --help            display this help message and exit.

Note: Export the "CHECKUPDATES_DB" variable to change the path of the temporary database.

__EOF__
}

OPT_SHORT='dh'
OPT_LONG=('download' 'help' 'nocolor')

if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
	exit 1
fi
set -- "${OPTRET[@]}"
unset OPT_SHORT OPT_LONG OPTRET

while :; do
	case $1 in
		-d|--download)
			DOWNLOAD_CACHE=1 ;;
		-h|--help)
			usage
			exit 0 ;;
		--nocolor)
			USE_COLOR='n';;
		--)
			shift
			break ;;
	esac
	shift
done

# check if messages are to be printed using color
if [[ -t 2 && $USE_COLOR != "n" ]]; then
	colorize
else
	unset ALL_OFF BOLD BLUE GREEN RED YELLOW
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-${UID}/"
fi

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

DBPath="$(pacman-conf DBPath)"
if [[ -z "$DBPath" ]] || [[ ! -d "$DBPath" ]]; then
	DBPath="/var/lib/pacman/"
fi

mkdir -p "$CHECKUPDATES_DB"
ln -s "${DBPath}/local" "$CHECKUPDATES_DB" &> /dev/null
if ! fakeroot -- pacman -Sy --dbpath "$CHECKUPDATES_DB" --logfile /dev/null &> /dev/null; then
	error 'Cannot fetch updates'
	exit 1
fi
mapfile -t updates < <(pacman -Qu --dbpath "$CHECKUPDATES_DB" 2> /dev/null | grep -v '\[.*\]')

if (( ${#updates[@]} )); then
	printf '%s\n' "${updates[@]}"
	if (( DOWNLOAD_CACHE )); then
		sudo pacman -Sw --noconfirm "${updates[@]%% *}" --dbpath "$CHECKUPDATES_DB" --logfile /dev/null
	fi
else
	exit 2
fi

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