x11vnc

#!/bin/bash
### BEGIN INIT INFO
# Provides:          x11vnc
# Should-Start:
# Required-Start:    lightdm
# Required-Stop:     
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: X11 VNC Server for Display :0
# Description:       Debian init script for the X11 VNC Server
### END INIT INFO
#
# Authors:	Brian Cunnie <cunnie@pivotallabs.com>
#		Colin Deeb <deeb@pivotallabs.com> 
#		Laurence Koret <lkoret@pivotallabs.com>
#
# MIT License
set -e

PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/bin/x11vnc
DAEMON_ARGS="-forever -display :0"
DAEMON_USER=pi
eval DAEMON_HOME=~$DAEMON_USER
DISPLAY=:0

. /lib/lsb/init-functions

# The X Server can take from 3-8 seconds to start, so we
# try for 20 seconds to test to see if the Xserver is up
# before starting the VNC server.
function start_x11vnc() {
  local COUNT LIMIT XAUTHORITY
  COUNT=0
  LIMIT=20
  
  while :; do
    if xrdb -query -display $DISPLAY > /dev/null 2>&1; then
      log_daemon_msg "Start x11vnc: X is running"
      start-stop-daemon --start --quiet \
        --name x11vnc --chuid $DAEMON_USER --background \
        --exec $DAEMON -- $DAEMON_ARGS
      return $?
    else
      COUNT=$(($COUNT + 1))
      if [ $COUNT -ge $LIMIT ]; then
	log_daemon_msg "Start x11vnc: Giving up; X isn't running on $DISPLAY"
	return 2
      fi
      log_daemon_msg "Start x11vnc: X isn't up yet; waited $COUNT seconds"
      sleep 1
      cp $DAEMON_HOME/.Xauthority ~ || true
    fi
  done
}

case "$1" in
  start)
    log_daemon_msg "Start x11vnc"
    start_x11vnc
    log_daemon_msg " End start x11vnc"
    ;;
  stop)
    start-stop-daemon --stop --quiet --name x11vnc 
    log_daemon_msg "x11vnc has been stopped"
    ;;
  *)
    echo "Usage: /etc/init.d/x11vnc {start|stop}"
    exit 1
    ;;
esac
exit 0