#!/bin/sh
#
# 2013 Thomas Oettli (otho at sfs.biz)
#
# 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/>.
#
#
# Manage packages with Portage (mostly gentoo)
#

if [ -f "$__object/parameter/name" ]; then
   name="$__object/parameter/name"
else
   name="$__object_id"
fi

if [ -f "$__object/parameter/state" ]; then
   state_should="$(cat "$__object/parameter/state")"
else
   state_should="present"
fi

pkg_version="$(cat "$__object/explorer/pkg_version")"
if [ -z "$pkg_version" ]; then
    state_is="absent"
elif [ $(echo "$pkg_version" | wc -l) -gt 1 ]; then
    echo "Package name is not unique! The following packages are installed:"
    echo "$pkg_version"
    exit 1
else
    state_is="present"
    installed_version="$(echo "$pkg_version" | cut -d " " -f 2)"
fi

if [ -f "$__object/parameter/version" ]; then
    version="$(cat "$__object/parameter/version")"
    if [ ! -z "$version" ]; then
        name="=$name-$version"
    fi
else
    version=""
fi

# Exit if nothing is needed to be done
[ "$state_is" = "$state_should" ] && ( [ -z "$version" ] || [ "$installed_version" = "$version" ] ) && exit 0
[ "$state_should" = "absent" ] && [ ! -z "$version" ] && [ "$installed_version" != "$version" ] && exit 0

case "$state_should" in
   present)
        echo "emerge \"$name\" &>/dev/null || exit 1"
        ;;
   absent)
        echo "emerge -C \"$name\" &>/dev/null || exit 1"
        ;;
   *)
        echo "Unknown state: $state_should" >&2
        exit 1
        ;;
esac