#/bin/sh

# Daily script.  Run tarsnap backup
# periodic(8) doesn't work for me on a MacBook, so poll

[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
pgrep -fq daily.sh && { echo "Already running"; exit 1; }

set -u
export LANG=C
last=0
pid=daily.pid
strategy=./strategy.sh
t24h=$((24 * 60 * 60))
t5m=$((5 * 60))

[ -f $strategy ] || { echo "$strategy not found"; exit 1; }
echo $$ > $pid

mkdir -p logs
while true; do
	if [ $((`date +%s` - last)) -ge $t24h ]; then
		log=logs/daily.log.`date +%Y%m%d`
		caffeinate $strategy >> $log 2>&1 && {
			last="`date +%Y%m%d`050000" # today @ 05:00
			last=`date -j -f '%Y%m%d%H%M%S' '+%s' $last` # in seconds
		}
		ln -f $log logs/latest
	fi
	sleep $t5m
done