#!/bin/sh
#
# 2011-2012 Nico Schottelius (nico-cdist at schottelius.org)
# 2021 Dennis Camera (cdist at dtnr.ch)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
# Retrieve the status of a package - parsed dpkg output
#

breify() {
	# Convert arguments to a POSIX BRE-compatible form, i.e. escape special
	# characters (incl. delimiter)
	printf '%s' "$*" | sed -e 's/[].^$*\[]/\\&/g' -e 's:/:\\/:g'
}


if test -f "${__object}/parameter/name"
then
	name=$(cat "${__object:?}/parameter/name")
else
	name=${__object_id:?}
fi

state_dir=$(apt-config dump | sed -n -e 's/^Dir::State  *"\(.*\)";$/\/\1/p')
extended_states_file=${state_dir%/}/extended_states

# if $name is e.g. editor, check if any editor is installed instead
rprovides=$(apt-cache showpkg "${name}" | sed -e '1,/^Reverse Provides:/d' -e 's/ .*$//')

for pkg in ${name} ${rprovides}
do
	if dpkg -s "${pkg}" 2>/dev/null | grep -qxF 'Status: install ok installed'
	then
		version=$(dpkg -s "${pkg}" 2>/dev/null | sed -n -e 's/^Version:  *//p')

		if test -f "${extended_states_file}"
		then
			# On Debian >= 5 check if the package is auto installed

			# NOTE: instead of using apt-mark(8) parse the extended_states file
			#       directly. apt-mark is sloow and didn't have a stable
			#       interface in older Debian versions.
			is_auto=$(sed -n -e '/^Package: '$(breify "${name}")'$/,/^$/!d' -e 's/^Auto-Installed: *//p' "${extended_states_file}")
		fi

		# NOTE: older versions don't have apt-mark -> all packages are manual
		auto_word=$(test $((is_auto)) -ne 0 && echo auto || echo manual)

		echo "present ${auto_word} ${pkg} ${version}"
		exit 0
	fi
done

echo absent