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#!/bin/sh
# $Id$
##
# based on vdrshutdown-acpi.pl
# by Thomas Koch <tom@linvdr.org>
##
# Author:
# Matthias Schwarzott <zzam at gmx dot de>
#
# Parameter:
# $1 : Time to be up and running as unix-timestamp
#
PROC_ALARM="/proc/acpi/alarm"
die()
{
echo "ERROR: $@" 1>&2
exit 1
}
checkUTC()
{
unset clock
unset CLOCK
local f
for f in /etc/conf.d/hwclock /etc/conf.d/clock /etc/rc.conf; do
if [ -f "${f}" ]; then
. "${f}"
break
fi
done
clock="${clock:-${CLOCK}}"
[ "${clock}" = "UTC" ]
}
writeAlarm()
{
# write 2 times (some bioses need this)
echo "$1" > "${PROC_ALARM}"
echo "$1" > "${PROC_ALARM}"
}
# main part starts here
if [ ! -w "${PROC_ALARM}" ]; then
die "Can not access ${PROC_ALARM}."
fi
test $# -ge 1 || die "Wrong Parameter Count"
# time the system should be up
Next="${1}"
# write time to RTC now, as it may disable wakeup if done after writing alarm time
if [ -x /etc/init.d/hwclock ]; then
/etc/init.d/hwclock --quiet save
else
/etc/init.d/clock --quiet save
fi
if [ "${Next}" -eq 0 ]; then
# This hopefully deactivates wakeup
writeAlarm "2003-10-20 99:00:00"
exit 0
fi
# abort if recording less then 10min in future
now=$(date +%s)
[ "${Next}" -lt "$(($now+600))" ] && die "wakeup time too near, alarm not set"
# boot 5min (=300s) before recording
timestamp=$(($Next-300))
checkUTC && dateparam="-u"
timestr=$(date ${dateparam} --date="1970-01-01 UTC ${timestamp} seconds" +"%Y-%m-%d %H:%M:00")
[ -z "${timestr}" ] && die "date did not return a string"
writeAlarm "${timestr}"
exit 0
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