Nginx init script

 

#! /bin/sh
### BEGIN INIT INFO
# Provides:          nginx
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: nginx init.d dash script for Ubuntu <=9.10.
# Description:       nginx init.d dash script for Ubuntu <=9.10.
### END INIT INFO
#------------------------------------------------------------------------------
# nginx - this Debian Almquist shell (dash) script, starts and stops the nginx 
#         daemon for ubuntu 9.10 and lesser version numbered releases.
#
# description:  Nginx is an HTTP(S) server, HTTP(S) reverse \
#               proxy and IMAP/POP3 proxy server.  This \
#		script will manage the initiation of the \
#		server and it's process state.
#
# processname: nginx
# config:      /usr/local/nginx/conf/nginx.conf
# pidfile:     /acronymlabs/server/nginx.pid
# Provides:    nginx
#
# Author:  Jason Giedymin
#          <jason.giedymin AT gmail.com>.
#
# Version: 2.0 02-NOV-2009 jason.giedymin AT gmail.com
# Notes: nginx init.d dash script for Ubuntu <=9.10.
# 
# This script's project home is:
# 	http://code.google.com/p/nginx-init-ubuntu/
#
#------------------------------------------------------------------------------
#                               MIT X11 License
#------------------------------------------------------------------------------
#
# Copyright (c) 2009 Jason Giedymin, http://Amuxbit.com formerly
#				     http://AcronymLabs.com
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#------------------------------------------------------------------------------

#------------------------------------------------------------------------------
#                               Functions
#------------------------------------------------------------------------------
. /lib/lsb/init-functions

#------------------------------------------------------------------------------
#                               Consts
#------------------------------------------------------------------------------
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/nginx/sbin/nginx

PS="nginx"
PIDNAME="nginx"				#lets you do $PS-slave
PIDFILE=$PIDNAME.pid                    #pid file
PIDSPATH=/var/run

DESCRIPTION="Nginx Server..."

RUNAS=root                              #user to run as

SCRIPT_OK=0                             #ala error codes
SCRIPT_ERROR=1                          #ala error codes
TRUE=1                                  #boolean
FALSE=0                                 #boolean

lockfile=/var/lock/subsys/nginx
NGINX_CONF_FILE="/etc/nginx/nginx.conf"

#------------------------------------------------------------------------------
#                               Simple Tests
#------------------------------------------------------------------------------

#test if nginx is a file and executable
test -x $DAEMON || exit 0

# Include nginx defaults if available
if [ -f /etc/default/nginx ] ; then
        . /etc/default/nginx
fi

#set exit condition
#set -e

#------------------------------------------------------------------------------
#                               Functions
#------------------------------------------------------------------------------

setFilePerms(){

        if [ -f $PIDSPATH/$PIDFILE ]; then
                chmod 400 $PIDSPATH/$PIDFILE
        fi
}

configtest() {
	$DAEMON -t -c $NGINX_CONF_FILE
}

getPSCount() {
	return `pgrep -f $PS | wc -l`
}

isRunning() {
        if [ $1 ]; then
                pidof_daemon $1
                PID=$?

                if [ $PID -gt 0 ]; then
                        return 1
                else
                        return 0
                fi
        else
                pidof_daemon
                PID=$?

                if [ $PID -gt 0 ]; then
                        return 1
                else
                        return 0
                fi
        fi
}

#courtesy of php-fpm
wait_for_pid () {
        try=0

        while test $try -lt 35 ; do

                case "$1" in
                        'created')
                        if [ -f "$2" ] ; then
                                try=''
                                break
                        fi
                        ;;

                        'removed')
                        if [ ! -f "$2" ] ; then
                                try=''
                                break
                        fi
                        ;;
                esac

                #echo -n .
                try=`expr $try + 1`
                sleep 1
        done
}

status(){
	isRunning
	isAlive=$?

	if [ "${isAlive}" -eq $TRUE ]; then
                echo "$PIDNAME found running with processes:  `pidof $PS`"
        else
                echo "$PIDNAME is NOT running."
        fi

}

removePIDFile(){
	if [ $1 ]; then
                if [ -f $1 ]; then
        	        rm -f $1
	        fi
        else
		#Do default removal
		if [ -f $PIDSPATH/$PIDFILE ]; then
        	        rm -f $PIDSPATH/$PIDFILE
	        fi
        fi
}

start() {
        log_daemon_msg "Starting $DESCRIPTION"

	isRunning
	isAlive=$?

        if [ "${isAlive}" -eq $TRUE ]; then
                log_end_msg $SCRIPT_ERROR
        else
                start-stop-daemon --start --quiet --chuid $RUNAS --pidfile $PIDSPATH/$PIDFILE --exec $DAEMON \
                -- -c $NGINX_CONF_FILE
                setFilePerms
                log_end_msg $SCRIPT_OK
        fi
}

stop() {
	log_daemon_msg "Stopping $DESCRIPTION"

	isRunning
	isAlive=$?
        if [ "${isAlive}" -eq $TRUE ]; then
                start-stop-daemon --stop --quiet --pidfile $PIDSPATH/$PIDFILE

		wait_for_pid 'removed' $PIDSPATH/$PIDFILE

                if [ -n "$try" ] ; then
                        log_end_msg $SCRIPT_ERROR
                else
                        removePIDFile
	                log_end_msg $SCRIPT_OK
                fi

        else
                log_end_msg $SCRIPT_ERROR
        fi
}

reload() {
	configtest || return $?

	log_daemon_msg "Reloading (via HUP) $DESCRIPTION"

        isRunning
        if [ $? -eq $TRUE ]; then
		`killall -HUP $PS` #to be safe

                log_end_msg $SCRIPT_OK
        else
                log_end_msg $SCRIPT_ERROR
        fi
}

quietupgrade() {
	log_daemon_msg "Peforming Quiet Upgrade $DESCRIPTION"

        isRunning
        isAlive=$?
        if [ "${isAlive}" -eq $TRUE ]; then
		kill -USR2 `cat $PIDSPATH/$PIDFILE`
		kill -WINCH `cat $PIDSPATH/$PIDFILE.oldbin`

		isRunning
		isAlive=$?
		if [ "${isAlive}" -eq $TRUE ]; then
			kill -QUIT `cat $PIDSPATH/$PIDFILE.oldbin`
			wait_for_pid 'removed' $PIDSPATH/$PIDFILE.oldbin
                        removePIDFile $PIDSPATH/$PIDFILE.oldbin

			log_end_msg $SCRIPT_OK
		else
			log_end_msg $SCRIPT_ERROR

			log_daemon_msg "ERROR! Reverting back to original $DESCRIPTION"

			kill -HUP `cat $PIDSPATH/$PIDFILE`
			kill -TERM `cat $PIDSPATH/$PIDFILE.oldbin`
			kill -QUIT `cat $PIDSPATH/$PIDFILE.oldbin`

			wait_for_pid 'removed' $PIDSPATH/$PIDFILE.oldbin
                        removePIDFile $PIDSPATH/$PIDFILE.oldbin

			log_end_msg $SCRIPT_ok
		fi
        else
                log_end_msg $SCRIPT_ERROR
        fi
}

terminate() {
        log_daemon_msg "Force terminating (via KILL) $DESCRIPTION"

	PIDS=`pidof $PS` || true

	[ -e $PIDSPATH/$PIDFILE ] && PIDS2=`cat $PIDSPATH/$PIDFILE`

	for i in $PIDS; do
		if [ "$i" = "$PIDS2" ]; then
	        	kill $i
                        wait_for_pid 'removed' $PIDSPATH/$PIDFILE
			removePIDFile
		fi
	done

	log_end_msg $SCRIPT_OK
}

destroy() {
	log_daemon_msg "Force terminating and may include self (via KILLALL) $DESCRIPTION"
	killall $PS -q >> /dev/null 2>&1
	log_end_msg $SCRIPT_OK
}

pidof_daemon() {
    PIDS=`pidof $PS` || true

    [ -e $PIDSPATH/$PIDFILE ] && PIDS2=`cat $PIDSPATH/$PIDFILE`

    for i in $PIDS; do
        if [ "$i" = "$PIDS2" ]; then
            return 1
        fi
    done
    return 0
}

case "$1" in
  start)
	start
        ;;
  stop)
	stop
        ;;
  restart|force-reload)
	stop
	sleep 1
	start
        ;;
  reload)
	$1
	;;
  status)
	status
	;;
  configtest)
        $1
        ;;
  quietupgrade)
	$1
	;;
  terminate)
	$1
	;;
  destroy)
	$1
	;;
  *)
	FULLPATH=/etc/init.d/$PS
	echo "Usage: $FULLPATH {start|stop|restart|force-reload|status|configtest|quietupgrade|terminate|destroy}"
	echo "       The 'destroy' command should only be used as a last resort." 
	exit 1
	;;
esac

exit 0