helloinit

#! /bin/sh
### BEGIN INIT INFO
# Provides:          helloInit
# Required-Start:    $remote_fs $syslog $network $portmap $time $localfs $named
# Required-Stop:     $remote_fs $syslog $network $portmap $time $localfs $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: A simple webserver demonstrating a node.js init script
# Description:       This shows the best way to construct a node.js init script
#                    It implements the best practices described in
#                    LSB 3.1 Section 20: System Initialization
### END INIT INFO

# Author: William Blankenship  <[email protected]>
#
# Do NOT "set -e"
# Keep lines under 80 characters in output!

# PATH should be wherever node install --global puts stuff
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="Incredibly Awesome Node.js WebServer"
NAME=helloinit
DAEMON=/usr/bin/$NAME
DAEMON_ARGS="--port 8080"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
KILL=10 #When stopping a process, go from TERM to KILL after $KILL seconds
FAIL=20 #When stopping a process, fail after $FAIL seconds

# 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
. /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

#
# 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
	start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
		|| return 1
	start-stop-daemon --start --quiet --pidfile $PIDFILE --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.
  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
  PID="$(pgrep -f '/usr/bin/helloinit')"
  if [ $? -ne 0 ]; then
    return 1
  fi
  KILLCOUNT=0 
  kill $PID > /dev/null 2>&1
  while [ $? -lt 1 ]; do
    if [ $KILLCOUNT -ge $FAIL ]; then
      return 2 #Could not kill process...
    fi
    sleep 1
    KILLCOUNT=$((KILLCOUNT + 1))
    if [ $KILLCOUNT -lt $KILL ]; then
      kill $PID > /dev/null 2>&1
    else
      #Could not term process...
      kill -SIGKILL $PID > /dev/null 2>&1
    fi
  done
  return 0
}

do_status()
{
  # Return
  #   0 program is running or service is OK
  #   1 program is dead and /var/run pid file exists
  #   2 program is dead and /var/lock lock file exists
  #   3 program is not running
  #   4 program or service status is unknown
  PID="$(pgrep -f '/usr/bin/helloinit')"
  if [ $PID -ne 0 ]; then
    log_success_msg "$NAME is running"
    return 0
  else
    log_failure_msg "$NAME has stopped"
    return 3
  fi
}

case "$1" in
  start)
	log_daemon_msg "Starting $DESC" "$NAME"
	do_start
	case "$?" in
		0|1) log_end_msg 0 ;;
		2) log_end_msg 1 ;;
	esac
	;;
  stop)
	log_daemon_msg "Stopping $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) log_end_msg 0 ;;
		2) log_end_msg 1 ;;
	esac
	;;
  status)
    do_status
    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}" >&2
	exit 3
	;;
esac

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