record_wakeup.sh

#!/bin/bash
#
# set ACPI Wakeup alarm
# safe_margin - minutes to start up system before the earliest timer
# script does not check if recording is in progress
#
#

echo 1 > /timer

# bootup system 60 sec. before timer
safe_margin=120

# modyfy if different location for tvheadend dvr/log path
cd /mnt/cache/.appdata/tvheadend/dvr/log

######################

start_date=0
stop_date=0

current_date=`date +%s`

for i in $( ls ); do
tmp_start=`cat $i | grep '"start":' | cut -f 2 -d " " | cut -f 1 -d ","`
tmp_stop=`cat $i | grep '"stop":' | cut -f 2 -d " " | cut -f 1 -d ","`

# check for outdated timer
if [ $((tmp_stop)) -gt $((current_date)) -a $((tmp_start)) -gt $((current_date)) ]; then

# take lower value (tmp_start or start_date)
if [ $((start_date)) -eq 0 -o $((tmp_start)) -lt $((start_date)) ]; then
start_date=$tmp_start
stop_date=$tmp_stop
fi
fi
done

wake_date=$((start_date-safe_margin))

echo $start_date >> /timer
echo $wake_date >> /timer

# set up waleup alarm
if [ $((start_date)) -ne 0 ]; then
echo 2 >> /timer
echo 0 > /sys/class/rtc/rtc0/wakealarm
echo $wake_date > /sys/class/rtc/rtc0/wakealarm
fi