#!/bin/sh -e
# __apt_backports/manifest
#
# 2020 Matthias Stecher (matthiasstecher at gmx.de)
#
# 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/>.
#
#
# Enables/disables backports repository. Utilies __apt_source for it.
#


# Get the distribution codename by /etc/os-release.
#  is already executed in a subshell by string substitution
#  lsb_release may not be given in all installations
codename_os_release() {
    # shellcheck disable=SC1090
    . "$__global/explorer/os-release"
    printf "%s" "$VERSION_CODENAME"
}

# detect backport distribution
os="$(cat "$__global/explorer/os")"
case "$os" in
    debian)
        dist="$( codename_os_release )"
        components="main"
        mirror="http://deb.debian.org/debian/"
        ;;
    devuan)
        dist="$( codename_os_release )"
        components="main"
        mirror="http://deb.devuan.org/merged"
        ;;
    ubuntu)
        dist="$( codename_os_release )"
        components="main restricted universe multiverse"
        mirror="http://archive.ubuntu.com/ubuntu"
        ;;

    *)
        printf "Backports for %s are not supported!\n" "$os" >&2
        exit 1
        ;;
esac

# error if no codename given (e.g. on Debian unstable)
if [ -z "$dist" ]; then
    printf "No backports for unkown version of distribution %s!\n" "$os" >&2
    exit 1
fi


# parameters
state="$(cat "$__object/parameter/state")"

# mirror already set for the os, only override user-values
if [ -f "$__object/parameter/mirror" ]; then
    mirror="$(cat "$__object/parameter/mirror")"
fi


# install the given backports repository
__apt_source "${dist}-backports" \
    --state "$state" \
    --distribution "${dist}-backports" \
    --component "$components" \
    --uri "$mirror"