#!/bin/bash

## Author Luis@32768.org at 2012-02-14
## check ping for ups every 2 mins, if down, shutdown in 3 mins, if ok within 2 mins, recover shutdown

## while true
## do

## get the gateway IP
GWIP='127.0.0.1'
let n=0
for x in `/sbin/route | grep default`
do
	if [ $n -eq 1 ]
	then
		GWIP=$x
		break
	fi
	let n=n+1
done

ping  -c 1 $GWIP > /dev/null
ret=$?

if [ $ret -eq 0 ]
then
	# $ret = 0
	# router is OK
	#echo "Router is UP!"
	## sleep 10
	pscnt=`ps | grep halt | grep -v grep | wc -l`
	if [ $pscnt -gt 0 ]
	then
		echo "Luis_UPS: AC Power/Network Recovered! Cancel shutdown!"
		##/sbin/shutdown -c "Luis_UPS: AC Power/Network Recovered! Cancel shutdown!" &
		/usr/bin/killall halt
	fi
else                                                                                   
	# $ret = 1                                                                            
	# if router fail, it meas 220V is down, or network is down                            
	echo "Luis_UPS: AC Power/Network Failed! Ready to shutdown in 180s!"                  
	pscnt=`ps | grep halt | grep -v grep | wc -l`                                         
	if [ $pscnt -eq 0 ]                                                                   
	then                                                                                  
		# if no shutdown in progress, then shutdown                                   
		echo "Luis_UPS: AC Power/Network Failed! Ready to shutdown in 3 mins!"        
		##/sbin/shutdown -h 3 "Luis_UPS: AC Power/Network Failed! Ready to shutdown!" &
		/sbin/halt -d 180 &                                                            
	fi                                                                                     
fi                                                                                             
## done