#!/bin/sh
################################################################################
#
#  Rattail -- Retail Software Framework
#  Copyright © 2010-2018 Lance Edgar
#
#  This file is part of Rattail.
#
#  Rattail 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.
#
#  Rattail 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
#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
#
################################################################################
#
# Generic 'init' script for all Rattail daemons.  Originally based on the
# skeleton file from a Debian 6 system, but tweaked plenty since...
#
# NOTE: The "calling" script *must* define $NAME and $DESC (at least).
#
################################################################################

# Files in /etc/default and/or the "calling" init script may define any of the
# following as necessary, to override:

SCRIPTNAME=${SCRIPTNAME:-"/etc/init.d/$NAME"}
PIDFILE=${PIDFILE:-"/var/run/rattail/$NAME.pid"}

PYTHON=${PYTHON:-"/usr/bin/python"}
RATTAIL=${RATTAIL:-"/usr/local/bin/rattail"}
RATTAIL_ARGS=${RATTAIL_ARGS:-""}
RATTAIL_SUBCMD=${RATTAIL_SUBCMD:-"${NAME##*-}"}
RATTAIL_SUBCMD_ARGS=${RATTAIL_SUBCMD_ARGS:-""}

USER=${USER:-"rattail"}
GROUP=${GROUP:-"rattail"}


# Read configuration variable files if present.
[ -r /etc/default/rattail ] && . /etc/default/rattail
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables.
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions


create_pid_dir() {
    PIDDIR=`dirname "$PIDFILE"`
    if [ ! -d "$PIDDIR" ]; then
        mkdir --parents "$PIDDIR"
    fi
    chown $USER:$GROUP "$PIDDIR"
}


#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    create_pid_dir
    start-stop-daemon --start --pidfile "$PIDFILE" --exec "$PYTHON" --user $USER --test --quiet >/dev/null \
        || return 1
    start-stop-daemon --start --pidfile "$PIDFILE" --exec "$PYTHON" --startas "$RATTAIL" --chuid $USER --group $GROUP --quiet -- \
        $RATTAIL_ARGS $RATTAIL_SUBCMD --pidfile="$PIDFILE" $RATTAIL_SUBCMD_ARGS start \
        || return 2
}


#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    /usr/local/bin/check-rattail-daemon "$NAME" >/dev/null \
        || return 1
    sudo -u $USER "$RATTAIL" $RATTAIL_ARGS $RATTAIL_SUBCMD --pidfile="$PIDFILE" $RATTAIL_SUBCMD_ARGS stop >/dev/null 2>&1 \
        || return 2
}


case "$1" in
    start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
    stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
    status)
        /usr/local/bin/check-rattail-daemon "$NAME" && exit 0 || exit $?
        ;;
    restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
            0|1)
                do_start
                case "$?" in
                    0) log_end_msg 0 ;;
                    1) log_end_msg 1 ;; # Old process is still running
                    *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
            *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
    *)
        echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
        exit 3
        ;;
esac

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