sample-control.sh

#!/bin/sh
#
# Control script designed to allow an easy command line interface
# to controlling any binary.  Written by Marc Slemko, 1997/08/23
#
# Modified for pixl-boot by Joe Huckaby, 2016/11/10
# 
# The exit codes returned are:
#	0 - operation completed successfully
#	2 - usage error
#	3 - binary could not be started
#	4 - binary could not be stopped
#	8 - configuration syntax error
#
# When multiple arguments are given, only the error from the _last_
# one is reported.  Run "*ctl help" for usage info
#
#
# |||||||||||||||||||| START CONFIGURATION SECTION  ||||||||||||||||||||
# --------------------							  --------------------
# 
NAME="YOUR_SERVICE_NAME_HERE"
BINARY="node lib/main.js"
PIDFILE="logs/pid.txt"
#
# --------------------							  --------------------
# ||||||||||||||||||||   END CONFIGURATION SECTION  ||||||||||||||||||||

# resolve symlinks to this script
SCRIPT=`perl -MCwd -le 'print Cwd::abs_path(shift)' "$0"`

if [ "x$SCRIPT" = "x" ] ; then 
	echo "ERROR: Cannot locate script: $0"
	exit 1;
fi

# locate home directory
DIR=`dirname $SCRIPT`
HOMEDIR=""
if [ -f "$DIR/package.json" ] ; then
	HOMEDIR="$DIR"
else
	HOMEDIR=`dirname $DIR`
fi
cd $HOMEDIR

# process CLI args
ERROR=0
ARGV="$@"
if [ "x$ARGV" = "x" ] ; then 
	ARGS="help"
fi

for ARG in $@ $ARGS
do
	# check for pidfile
	if [ -f $PIDFILE ] ; then
		PID=`cat $PIDFILE`
		if [ "x$PID" != "x" ] && kill -0 $PID 2>/dev/null ; then
			STATUS="$NAME running (pid $PID)"
			RUNNING=1
		else
			STATUS="$NAME not running (pid $PID?)"
			RUNNING=0
		fi
	else
		STATUS="$NAME not running (no pid file)"
		RUNNING=0
	fi

	case $ARG in
	start)
		if [ $RUNNING -eq 1 ]; then
			echo "$ARG: $NAME already running (pid $PID)"
			continue
		fi
		echo "$0 $ARG: Starting up $NAME..."
		if $BINARY ; then
			echo "$0 $ARG: $NAME started"
		else
			echo "$0 $ARG: $NAME could not be started"
			ERROR=3
		fi
	;;
	stop)
		if [ $RUNNING -eq 0 ]; then
			echo "$ARG: $STATUS"
			continue
		fi
		if kill $PID ; then
			while [ "x$PID" != "x" ] && kill -0 $PID 2>/dev/null ; do
				sleep 1;
			done
			echo "$0 $ARG: $NAME stopped"
		else
			echo "$0 $ARG: $NAME could not be stopped"
			ERROR=4
		fi
	;;
	restart)
		$0 stop start
	;;
	status)
		echo "$ARG: $STATUS"
	;;
	*)
	echo "usage: $0 (start|stop|restart|status|help)"
	cat <<EOF

start	- Starts $NAME as a daemon.
stop	- Stops $NAME and wait until it actually exits.
restart - Calls stop, then start (hard restart).
status	- Checks whether $NAME is currently running.
help	- Displays this screen.

EOF
	ERROR=2
	;;

	esac

done

exit $ERROR

## ====================================================================
## The Apache Software License, Version 1.1
##
## Copyright (c) 2000 The Apache Software Foundation.  All rights
## reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
##
## 1. Redistributions of source code must retain the above copyright
##	notice, this list of conditions and the following disclaimer.
##
## 2. Redistributions in binary form must reproduce the above copyright
##	notice, this list of conditions and the following disclaimer in
##	the documentation and/or other materials provided with the
##	distribution.
##
## 3. The end-user documentation included with the redistribution,
##	if any, must include the following acknowledgment:
##	   "This product includes software developed by the
##		Apache Software Foundation (http://www.apache.org/)."
##	Alternately, this acknowledgment may appear in the software itself,
##	if and wherever such third-party acknowledgments normally appear.
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##	nor may "Apache" appear in their name, without prior written
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## OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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## ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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## ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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## SUCH DAMAGE.
## ====================================================================
##
## This software consists of voluntary contributions made by many
## individuals on behalf of the Apache Software Foundation.  For more
## information on the Apache Software Foundation, please see
## <http://www.apache.org/>.
##
## Portions of this software are based upon public domain software
## originally written at the National Center for Supercomputing Applications,
## University of Illinois, Urbana-Champaign.
##
#