pp.back.deb.svc

#@ pp_backend_deb_init_svc_vars(): initialise deb-specific service variables
#    pp-provided vars are cmd, pidfile, stop_signal and user
pp_backend_deb_init_svc_vars () {

    reload_signal=
    start_runlevels=${pp_deb_default_start_runlevels-"2 3 4 5"} # == lsb default-start
    stop_runlevels=${pp_deb_default_stop_runlevels-"0 1 6"}     # == lsb default-stop
    svc_description="${pp_deb_default_svc_description}" # == lsb short descr
    svc_process=
    svc_init_filename="${pp_deb_svc_init_filename}"     # == $svc.init
    svc_init_filepath="${pp_deb_svc_init_filepath}"     # == /etc/init.d/ by default

    lsb_required_start='$local_fs $network'
    lsb_should_start=
    lsb_required_stop='$local_fs'
    lsb_description=

    start_priority=50
    stop_priority=50            #-- stop_priority = 100 - start_priority
}

#@ pp_deb_service_make_service_files(svc): generates a service init script
#   Assumes %service variables have been set before invocation
#   Creates an /etc/init.d/$svc script if one does not already exist.
#   Also creates a systemd service file for $svc.
pp_deb_service_make_service_files () {
    local svc=${svc_init_filename:-$1}
    local script="${svc_init_filepath:-"/etc/init.d"}/$svc"
    local out=$pp_destdir$script
    local _process _cmd

    pp_add_file_if_missing $script run 755 v || return 0

    #-- start out as an empty shell script
    cat <<-'.' >$out
	#!/bin/sh
.

    #-- determine the process name from $cmd unless $svc_process is given
    set -- $cmd
    #_process=${svc_process:-"$1"} --? WTF

    #-- construct a start command that builds a pid file if needed
    #-- the command name in /proc/[pid]/stat is limited to 15 characters 
    _cmd="$cmd";
    _cmd_path=`echo $cmd | cut -d" " -f1`
    _cmd_name=`basename $_cmd_path | cut -c1-15`
    _cmd_args=`echo $cmd | cut -d" " -f2-`
    test x"$_cmd_path" != x"$_cmd_args" || _cmd_args=

    #-- generate the LSB init info
    cat <<-. >>$out
	### BEGIN INIT INFO
	# Provides: ${svc}
	# Required-Start: ${lsb_required_start}
	# Should-Start: ${lsb_should_start}
	# Required-Stop: ${lsb_required_stop}
	# Default-Start: ${start_runlevels}
	# Default-Stop: ${stop_runlevels}
	# Short-Description: ${svc_description:-no description}
	### END INIT INFO
	# Generated by PolyPackage ${pp_version}
	# ${copyright}

.

    if test x"${svc_description}" = x"${pp_deb_default_svc_description}"; then
        svc_description=
    fi

    #-- write service-specific definitions
    cat <<. >>$out
#-- definitions specific to service ${svc}
NAME="${_cmd_name}"
DESC="${svc_description:-$svc service}"
USER="${user}"
GROUP="${group}"
PIDFILE="${pidfile}"
STOP_SIGNAL="${stop_signal}"
RELOAD_SIGNAL="${reload_signal}"
CMD="${_cmd}"
DAEMON="${_cmd_path}"
DAEMON_ARGS="${_cmd_args}"
SCRIPTNAME=${script}
.

    #-- write the generic part of the init script
    cat <<'.' >>$out

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

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

# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# 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
    if [ -n "$PIDFILE" ]
    then
        pidfile_opt="--pidfile $PIDFILE"
    else
        pidfile_opt="--make-pidfile --background --pidfile /var/run/$NAME.pid"
    fi
    if [ -n "$USER" ]
    then
        user_opt="--user $USER"
    fi
    if [ -n "$GROUP" ]
    then
        group_opt="--group $GROUP"
    fi

	start-stop-daemon --start --quiet $pidfile_opt $user_opt --exec $DAEMON --test > /dev/null \
	    || return 1

    # Note: there seems to be no way to tell whether the daemon will fork itself or not, so pass
    # --background for now
    start-stop-daemon --start --quiet $pidfile_opt $user_opt --exec $DAEMON -- \
    	$DAEMON_ARGS \
    	|| 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
    if [ -n "$PIDFILE" ]
    then
        pidfile_opt="--pidfile $PIDFILE"
    else
        pidfile_opt="--pidfile /var/run/$NAME.pid"
    fi
    if [ -n "$USER" ]
    then
        user_opt="--user $USER"
    fi
    if [ -n $STOP_SIGNAL ]
    then
        signal_opt="--signal $STOP_SIGNAL"
    fi
	start-stop-daemon --stop --quiet $signal_opt --retry=TERM/30/KILL/5 $pidfile_opt --name $NAME
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
	# Wait for children to finish too if this is a daemon that forks
	# and if the daemon is only ever run from this initscript.
	# If the above conditions are not satisfied then add some other code
	# that waits for the process to drop all resources that could be
	# needed by services started subsequently.  A last resort is to
	# sleep for some time.
	start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
	[ "$?" = 2 ] && return 2
	# Many daemons don't delete their pidfiles when they exit.
	test -z $PIDFILE || rm -f $PIDFILE
	return "$RETVAL"
}

#
# Function that sends a restart signal 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.
	#
    if [ -n "$PIDFILE" ]
    then
        pidfile_opt="--pidfile $PIDFILE"
    else
        pidfile_opt="--pidfile /var/run/$NAME.pid"
    fi
    if [ -n "$RELOAD_SIGNAL" ]
    then
	    start-stop-daemon --stop --signal $RELOAD_SIGNAL --quiet $pidfile_opt --name $NAME
    fi
	return 0
}

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) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  reload|force-reload)
    if [ -n "$RELOAD_SIGNAL" ]
    then
	    log_daemon_msg "Reloading $DESC" "$NAME"
	    do_reload
	    log_end_msg $?
    else
        # Do a restart instead
        "$0" restart
    fi
	;;
  restart)
	#
	# 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|restart|force-reload}" >&2
	exit 3
	;;
esac

:
.
    chmod 755 $out

    # Create systemd service file
    pp_systemd_make_service_file $svc
}