#!/bin/sh /etc/rc.common

START=99
NAME=sched_updates

## You will see the value 4 instead of 24 for the hours.  The
## idea is that we only check for updates during 4 hours in the
## middle of the night.
## So....
##     4 * 60 ==  240




##============================================================
## Get the last bytes of the mac address to use as a 
## seed for checking the update site.
get_seed() {
	awk 'BEGIN {srand(); printf("%d\n", rand()*240)}'
}


##============================================================
## Build a valid crontab line that we can append to the crontab
build_cron() {
	local command=$1

	local seed=$(get_seed)

	local hour=$(expr ${seed} / 60)
	local minute=$(expr ${seed} % 60)

	echo " ${minute} ${hour}  *   *   *     ${command}"
}


##============================================================
## Append the new crontab line to the old crontab file.
add_to_cron() {
	local tempfile=/tmp/tempfile

	build_cron "$1" > ${tempfile}
	crontab -l | cat - ${tempfile} | crontab -
	rm -rf ${tempfile}
}

##============================================================
## Remove this script so that it is not run at every boot.
delete_self() {
	echo "Deleting /etc/rc.d/S${START}${NAME}"
	rm -rf /etc/rc.d/S${START}${NAME}
}


boot() {
	add_to_cron "streamboost auto_upload; streamboost auto_update && streamboost restart"
	delete_self
}