OpenWrt collectd survive reboot

rrd-backup.txt

cat <<'EOFFILE' >/usr/local/bin/rrd-backup
#!/bin/sh
set -e

mkdir -p /usr/local/share/rrd

cd /tmp
chsum_prev=`tar -cf - rrd | md5sum`
while true; do
    chsum=`tar -cf - rrd | tee rrd.tar | md5sum`
    [ x"$chsum_prev" = x"$chsum" ] && break
    chsum_prev=$chsum
done

cd /usr/local/share/rrd
tmpfile=`mktemp -p . rrd.tar.gz.XXXXXX`
gzip -c /tmp/rrd.tar >"$tmpfile"
mv "$tmpfile" rrd.tar.gz
rm -f /tmp/rrd.tar
EOFFILE

cat <<'EOFFILE' >/usr/local/bin/rrd-restore
#!/bin/sh
set -e

cd /tmp
if [ -d rrd ]; then
    >&2 echo "directory 'rrd' exists"
    exit 1
fi
tar -xzf /usr/local/share/rrd/rrd.tar.gz

EOFFILE

cat <<'EOFFILE' >/etc/init.d/rrd-restore
#!/bin/sh /etc/rc.common
START=70

start() {
    /usr/local/bin/rrd-restore
}
EOFFILE

chmod 755 /usr/local/bin/rrd-backup /usr/local/bin/rrd-restore /etc/init.d/rrd-restore

/etc/init.d/rrd-restore enable

echo '10 5 * * * /usr/local/bin/rrd-backup # added by rrd-backup.txt' >>/etc/crontabs/root
/etc/init.d/cron restart