#!/bin/sh
default=4.057
if [ ! `whoami` = "root" ]; then
	echo "must be root"
	exit 1
fi

olddir=`pwd`
name=`basename $0`
dir=`echo $0 | sed -e s/"$name"//`
cd $dir

if [ $# -eq 0 ]; then 
	echo " Enter the mean of the time lost each day in seconds"
	echo  "default value is $default"
	echo "Press ctrl-c to abort"
	read seconds
else
	seconds=$1
fi

if [ -z "$seconds" ]; then
	seconds=$default
	echo "Using default value for time"
fi

if [ $seconds -eq 0 ]; then 
	echo  "time is equal to 0"
	echo "aborting"
	exit 1
fi
	
cc -O correctclock.c -o correctclock -object -s
if [ ! -f /usr/local/bin ]; then
	mkdirs /usr/local/bin
fi
cp correctclock /usr/local/bin

if [ -f /usr/adm/correctclock.date ]; then
	rm /usr/adm/correctclock.date
fi
if [ -f /usr/adm/correctclock.log ]; then
	rm /usr/adm/correctclock.log
fi

echo -n "" >> /etc/crontab.local

already=`grep "correctclock" /etc/crontab.local`
cp /etc/crontab.local /etc/crontab.local.old
if [ ! -z "$already" ]; then
	grep -v "correctclock" /etc/crontab.local.old > /etc/crontab.local
fi
echo "#correctclock : ">> /etc/crontab.local
echo '0 9 * * *       root    /usr/local/bin/correctclock ' $seconds ' >>/usr/adm/correctclock.log 2>&1'  >> /etc/crontab.local
echo "30 12 * * *       root    /usr/local/bin/correctclock $seconds >>/usr/adm/correctclock.log 2>&1"  >> /etc/crontab.local

#initialize the date file
/usr/local/bin/correctclock "$seconds" >>/usr/adm/correctclock.log 2>&1

echo "Installed in /etc/crontab.local"
cd $oldir