Startup script for Express / Node.js application with the forever module

startup-app.sh

#!/bin/sh
##3.5...10...15...20...25...30...35...40...45...50...55...60...65...70...75...80
## 
##  Debian / Linux / Ubuntu / LSB
##  Startup script for Express / Node.js application with the forever module
##
##
##  A modification of "init.d.lsb.ex" by Nicolas Thouvenin 
##
##
## This is free software; you may redistribute it and/or modify
## it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2,
## or (at your option) any later version.
##
## This is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License with
## the Debian operating system, in /usr/share/common-licenses/GPL;  if
## not, write to the Free Software Foundation, Inc., 59 Temple Place,
## Suite 330, Boston, MA 02111-1307 USA
##
##


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##                                                                            ##
#                           APPLICATION section                                #
##                                                                            ##
################################################################################
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# !!!
# !!! If you do not want to change the variables below.
# !!! You must, first, rename the script with the name of the directory created 
# !!! by "express" and add the suffix ".sh"
# !!! Second, you must place this script right next to the directory created 
# !!! by "express"
# !!! 
# !!! For example:
# !!! /tmp/foo      # Created by the command "express /tmp/foo"
# !!! /tmp/foo.sh   # This script 
# !!! 

DESC=`/usr/bin/basename $0 .sh`
NAME="app.js"
DIR=`/usr/bin/dirname $(/bin/readlink -f $0)`
APP=${DIR}/${DESC}/${NAME}
export NODE_ENV=${NODE_ENV:="production"}


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#                       PATHs section                                          #
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export PATH=$HOME/local/bin:${PATH:=}
export MANPATH=$HOME/local/man:${MANPATH:=}
export LD_LIBRARY_PATH=$HOME/local/lib:${LD_LIBRARY_PATH:=}


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##                                                                            ##
#                       FOREVER section                                        #
##                                                                            ##
################################################################################
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running() {
	forever list 2>/dev/null | grep ${APP} 2>&1 >/dev/null
    return $?
}

start_server() {
	forever start ${APP} 2>&1 >/dev/null
	return $?
}

stop_server() {
	forever stop ${APP} 2>&1 >/dev/null
	return $?
}

################################################################################
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##                                                                            ##
#                       GENERIC section                                        #
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################################################################################
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. /lib/lsb/init-functions


DIETIME=10              # Time to wait for the server to die, in seconds
                        # If this value is set too low you might not
                        # let some servers to die gracefully and
                        # 'restart' will not work

STARTTIME=2             # Time to wait for the server to start, in seconds
                        # If this value is set each time the server is
                        # started (on start or restart) the script will
                        # stall to try to determine if it is running
                        # If it is not set and the server takes time
                        # to setup a pid file the log message might
                        # be a false positive (says it did not start
                        # when it actually did)

case "$1" in
	start)
		log_daemon_msg "Starting $DESC " "$NAME"
		# Check if it's running first
		if running ;  then
			log_progress_msg "apparently already running"
			log_end_msg 0
			exit 0
		fi
		if start_server ; then
			# NOTE: Some servers might die some time after they start,
			# this code will detect this issue if STARTTIME is set
			# to a reasonable value
			[ -n "$STARTTIME" ] && sleep $STARTTIME # Wait some time
			if  running ;  then
				# It's ok, the server started and is running
				log_end_msg 0
			else
				# It is not running after we did start
				log_end_msg 1
			fi
		else
			# Either we could not start it
			log_end_msg 1
		fi
		;;
	stop)
		log_daemon_msg "Stopping $DESC" "$NAME"
		if running ; then
			# Only stop the server if we see it running
			errcode=0
			stop_server || errcode=$?
			log_end_msg $errcode
		else
			# If it's not running don't do anything
			log_progress_msg "apparently not running"
			log_end_msg 0
			exit 0
		fi
		;;
	restart)
		log_daemon_msg "Restarting $DESC" "$NAME"
		errcode=0
		stop_server || errcode=$?
		# Wait some sensible amount, some server need this
		[ -n "$DIETIME" ] && sleep $DIETIME
		start_server || errcode=$?
		[ -n "$STARTTIME" ] && sleep $STARTTIME
		running || errcode=$?
		log_end_msg $errcode
		;;
	status)
		log_daemon_msg "Checking status of $DESC" "$NAME"
		if running ;  then
			log_progress_msg "running"
			log_end_msg 0
		else
			log_progress_msg "apparently not running"
			log_end_msg 1
			exit 1
		fi
		;;
	*)
		echo "Usage: ${0} {start|stop|status|restart}"
		exit 1
		;;
esac

exit 0