knot-resolver/debian/init-d-script

#!/bin/sh
# See init-d-script(5) for instructions on how to use this library.
#=============================================================================
# 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

# PATH should only include /usr/* if it runs after the mountnfs.sh
# script.  Scripts running before mountnfs.sh should remove the /usr/*
# entries.
PATH=/sbin:/usr/sbin:/bin:/usr/bin
export PATH

is_call_implemented() {
	command -V $1 > /dev/null 2>&1
}

do_usage() {
	if is_call_implemented do_reload ; then
		echo "Usage: $SCRIPTNAME {start|stop|status|reload|restart|try-restart|force-reload}" >&2
	else
		echo "Usage: $SCRIPTNAME {start|stop|status|restart|try-restart|force-reload}" >&2
	fi
}

call() {
	cmd="$1"
	shift
	if is_call_implemented ${cmd}_override ; then
	    ${cmd}_override "$@"
	else
            ${cmd} "$@"
        fi
}

#
# Function that starts the daemon/service
#

# Return
#   0 if daemon has been started
#   1 if daemon was already running
#   2 if daemon could not be started
do_start_cmd() {
	start-stop-daemon --start --quiet ${PIDFILE:+--pidfile ${PIDFILE}} \
	    $START_ARGS \
	    --startas $DAEMON --name $NAME --exec $DAEMON --test > /dev/null \
	    || return 1
	start-stop-daemon --start --quiet ${PIDFILE:+--pidfile ${PIDFILE}} \
	    $START_ARGS \
	    --startas $DAEMON --name $NAME --exec $DAEMON -- $DAEMON_ARGS \
	    || return 2
	# Add code here, if necessary, that waits for the process to be ready
	# to handle requests from services started subsequently which depend
	# on this one.  As a last resort, sleep for some time.
}

do_start()
{
	if is_call_implemented do_start_prepare ; then
		call do_start_prepare
	fi
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
	call do_start_cmd
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	if is_call_implemented do_start_cleanup ; then
		call do_start_cleanup
	fi
}

#
# Function that stops the daemon/service
#

# 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
do_stop_cmd() {
	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 \
	    $STOP_ARGS \
	    ${PIDFILE:+--pidfile ${PIDFILE}} --name $NAME --exec $DAEMON
	RETVAL="$?"
	[ "$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 \
	    $STOP_ARGS \
	    --exec $DAEMON
	[ "$?" = 2 ] && return 2
	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return $RETVAL
}

do_stop()
{
	if is_call_implemented do_stop_prepare ; then
		call do_stop_prepare
	fi
	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
	call do_stop_cmd
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	if is_call_implemented do_stop_cleanup ; then
		call do_stop_cleanup
	fi
}

do_restart() {
	[ "$VERBOSE" != no ] && log_daemon_msg "Restarting $DESC" "$NAME"
	call do_stop_cmd
	call do_start_cmd
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
}

do_force_reload() {
	if is_call_implemented do_reload ; then
		call do_reload
	else
		call do_restart
	fi
}

# Enable this using
# alias do_reload=do_reload_sigusr1
do_reload_sigusr1() {
        log_daemon_msg "Reloading $DESC configuration files" "$NAME"
        start-stop-daemon --oknodo --stop --signal 1 --quiet \
          --pidfile "$PIDFILE" --exec "$DAEMON"
        log_end_msg $?
}

do_status() {
	status_of_proc "$DAEMON" "$NAME" && return 0 || return $?
}

if [ "$DEBUG" = "true" ] ; then
    set -x
fi

SCRIPTNAME=$1
scriptbasename="$(basename $1)"
if [ "$scriptbasename" != "init-d-script" ] ; then
    script="$1"
    shift
    . $script
else
    exit 0
fi

NAME=${NAME:=$(basename $DAEMON)}
DESC=${DESC:=$NAME}

# Do not use pid file if $PIDFILE is 'none'.  Otherwise, generate from
# $NAME or use the value provided by the init.d script.
if [ none = "$PIDFILE" ] ; then
    PIDFILE=
elif [ -z "$PIDFILE" ] ; then
    PIDFILE=/var/run/$NAME.pid
fi

# Exit if the package is not installed
if [ none != "$DAEMON" ] && [ ! -x "$DAEMON" ] ; then
	exit 0
fi

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

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh
if [ -t 0 ] ; then # Be verbose when called from a terminal
    VERBOSE=yes
fi

case "$1" in
  start)
	call do_start
	;;
  stop)
	call do_stop
	;;
  status)
	call do_status
	;;
  reload)
	if is_call_implemented do_reload ; then
		do_reload
	else
		call do_usage
		exit 3
	fi
	;;
  force-reload)
	call do_force_reload
	;;
  restart)
	call do_restart
	;;
  try-restart)
        log_daemon_msg "Trying to restart $DESC" "$NAME"
	if call do_status > /dev/null 2>&1 ; then
	    call do_restart
            log_end_msg $?
	else
	    log_progress_msg "is not running."
            log_end_msg 1
    	fi
	;;
  '')
	call do_usage
	exit 3
	;;
  *)
	if is_call_implemented do_unknown ; then
	    call do_unknown "$1"
	    exit 3
	else
	    call do_usage
	    exit 3
	fi
	;;
esac
exit 0