#!/bin/sh -e
# gencode-remote
#
# 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/>.
#

# Checks the given state of the service and set it to the given
# state. Optionally, it executes the action if service running.


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


# read current status and parameters
state="$(cat "$__object/explorer/state")"
should="$(cat "$__object/parameter/state")"

# if systemd/service does not exist
if [ -z "$state" ]; then
    printf "systemd or service '%s' does not exist!\n" "$name" >&2
    exit 1
fi


# save the action required
required_action=""

# check the state of the service that should be
if [ "$state" != "$should" ]; then
    # select what to do to get the $should state
    case "$should" in
        running)
            if [ "$state" = "stopped" ]; then required_action="start"; fi
            ;;

        stopped)
            if [ "$state" = "running" ]; then required_action="stop"; fi
            ;;
    esac
fi

# check if the action can be achieved if given
if [ -f "$__object/parameter/action" ] \
    && [ -z "$required_action" ] && [ "$state" = "running" ]; then

    # there must be an action
    action="$(cat "$__object/parameter/action")"

    # select the action to the required element
    case "$action" in
        restart)
            required_action="restart"
            ;;

        reload)
            required_action="reload"
            ;;

        *)
            printf "action '%s' does not exist!" "$action" >&2
            exit 2
    esac

    # Make a special check: only do this action if a dependency did something
    # it is required that the dependencies write there action to $__messages_in
    if [ -f "$__object/parameter/if-required" ]; then
        # exit here if there are no changes from the dependencies affected (nothing to do)
        if ! grep -q -f "$__object/require" "$__messages_in"; then exit 0; fi
    fi
fi

# print the execution command if a action given
if [ -n "$required_action" ]; then
    # also print it as message
    echo "$required_action" >> "$__messages_out"
    echo "systemctl $required_action '$name'"
fi