#!/bin/sh
### BEGIN INIT INFO
# Provides:          matrix-sydent
# Required-Start:    $local_fs $network $remote_fs $syslog
# Required-Stop:     $local_fs $network $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Sydent Matrix Identity Server
# Description:       Sydent is the reference identity server for Matrix
### END INIT INFO

# Author: Paul "LeoNerd" Evans <paul@matrix.org>
# Modified for Sydent by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

set -e

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="matrix-sydent"
NAME=matrix-sydent
SCRIPTNAME=/etc/init.d/$NAME

PYTHON="/usr/bin/python3"
USER="matrix-sydent"
GROUP="${USER}"
SHAREDIR=/var/lib/$NAME

SYDENT_CONF="/etc/matrix-sydent/sydent.conf"
SYDENT_SERVER_NAME="${HOSTNAME}"

# Read configuration variable file if it is present
if [ -r /etc/default/$NAME ]; then
	. /etc/default/$NAME
fi

# Exit if the package is not installed
if [ ! -f "${SYDENT_CONF}" ]; then
	exit 0
fi

export SYDENT_CONF
export SYDENT_SERVER_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

get_config_key()
{
	key=$1
	if [ ! -e "${SYDENT_CONF}" ]; then
		return 2
	fi
	set +e
	val=`grep "${key}" "${SYDENT_CONF}" | sed -E "s/${key}\s=\s(.*)\$/\1/" 2>/dev/null`
	set -e
	if [ "x$val" = "x" ]; then
		return 2
	fi
	echo -n "${val}"
	return 0
}

#
# 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
	PIDFILE=$(get_config_key "pidfile.path")
	RETVAL=$?

	if [ "${RETVAL}" != 0 ]; then
		return ${RETVAL}
	fi
	if [ -r "${PIDFILE}" ]; then
		kill -0 $(cat "${PIDFILE}") 2>/dev/null && return 1 || true
	fi
	if ! echo "${PIDFILE}" | grep -E -q "^(/var|)/run/matrix-sydent/[^/]+\$"; then
		return 2
	fi
	if [ ! -d "$(dirname ${PIDFILE})" ]; then
		mkdir "$(dirname ${PIDFILE})"
		chown "${USER}:${GROUP}" "$(dirname ${PIDFILE})"
		chmod 0750 "$(dirname ${PIDFILE})"
	fi
	rm -f "${PIDFILE}"

	start-stop-daemon --start --background \
	                  --pidfile "${PIDFILE}" \
	                  --chuid "$USER" \
	                  --exec $PYTHON -- \
	                  -m "sydent.sydent" || return 2
	return 0
}

#
# 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
	PIDFILE=$(get_config_key pidfile.path)
	RETVAL=$?
	if [ "${RETVAL}" != 0 ]
	then
		return ${RETVAL}
	fi

	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile "${PIDFILE}" --user "$USER"
	RETVAL="$?"
	[ "${RETVAL}" = 2 ] && return 2

	# Many daemons don't delete their pidfiles when they exit.
	rm -f "${PIDFILE}"
	return "${RETVAL}"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
	#
	# If the daemon can reload its configuration without
	# restarting (for example, when it is sent a SIGHUP),
	# then implement that here.
	#
	return 1
}

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) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  status)
	PIDFILE=$(get_config_key pidfile.path)
	RETVAL=$?
	if [ "${RETVAL}" != 0 ]; then
		return ${RETVAL}
	fi
	status_of_proc -p "${PIDFILE}" "$PYTHON" "$NAME" && exit 0 || exit $?
	;;
  #reload|force-reload)
	#
	# If do_reload() is not implemented then leave this commented out
	# and leave 'force-reload' as an alias for 'restart'.
	#
	#log_daemon_msg "Reloading $DESC" "$NAME"
	#do_reload
	#log_end_msg $?
	#;;
  restart|force-reload)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	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|restart|reload|force-reload}" >&2
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
	exit 3
	;;
esac

: vi:noet:ts=8
