#!/bin/sh -e
#
# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
#
# 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 on Debian and co.
#

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

state_should="$(cat "$__object/parameter/state")"

version_param="$__object/parameter/version"

version=""
if [ -f "$version_param" ]; then
    version="$(cat "$version_param")"
fi

if [ -f "$__object/parameter/target-release" ]; then
   target_release="--target-release $(cat "$__object/parameter/target-release")"
else
   target_release=""
fi

if [ -f "$__object/parameter/install-recommends" ]; then
    # required if __apt_norecommends is used
    recommendsparam="-o APT::Install-Recommends=1"
else
    recommendsparam="-o APT::Install-Recommends=0"
fi

if [ -f "$__object/parameter/purge-if-absent" ]; then
	purgeparam="--purge"
else
	purgeparam=""
fi


# FIXME: use grep directly, state is a list, not a line!
state_is="$(cat "$__object/explorer/state")"
case "$state_is" in
    present*)
       name="$(echo "$state_is" | cut -d ' ' -f 2)"
       version_is="$(echo "$state_is" | cut -d ' ' -f 3)"
       state_is="present"
    ;;
    *)
       version_is=""
    ;;
esac

if [ "$state_is" = "$state_should" ]; then
    if [ -z "$version" ] || [ "$version" = "$version_is" ]; then
        exit 0;
    fi
fi

# Hint if we need to avoid questions at some point:
# DEBIAN_PRIORITY=critical can reduce the number of questions
aptget="DEBIAN_FRONTEND=noninteractive apt-get --quiet --yes -o Dpkg::Options::=\"--force-confdef\" -o Dpkg::Options::=\"--force-confold\""

case "$state_should" in
    present)
        # There are special arguments to apt(8) to prevent aborts if apt woudn't been
        # updated after the 19th April 2021 till the bullseye release. The additional
        # arguments acknoledge the happend suite change (the apt(8) update does the
        # same by itself).
        #
        # Using '-o $config' instead of the --allow-releaseinfo-change-* parameter
        # allows backward compatablility to pre-buster Debian versions.
        #
        # See more: ticket #861
        # https://code.ungleich.ch/ungleich-public/cdist/-/issues/861
        apt_opts="-o Acquire::AllowReleaseInfoChange::Suite=true -o Acquire::AllowReleaseInfoChange::Version=true"

        # following is bit ugly, but important hack.
        # due to how cdist config run works, there isn't
        # currently better way to do it :(
        cat << EOF
if [ ! -f /var/cache/apt/pkgcache.bin ] || [ "\$( stat --format %Y /var/cache/apt/pkgcache.bin )" -lt "\$( date +%s -d '-1 day' )" ]
then echo apt-get $apt_opts update > /dev/null 2>&1 || true
fi
EOF
        if [ -n "$version" ]; then
            name="${name}=${version}"
        fi
        echo "$aptget $recommendsparam install $target_release '$name'"
        echo "installed" >> "$__messages_out"
    ;;
    absent)
        echo "$aptget remove $purgeparam '$name'"
        echo "removed" >> "$__messages_out"
    ;;
    *)
        echo "Unknown state: $state_should" >&2
        exit 1
    ;;
esac