[users] Modified update-data.sh script

[Karl Shea]

I got sick of seeing all kinds of ixfr traffic because all the zones 
were updated each time make was run from update-data.sh, so I modified 
the script. It will only run when the new data file is different from 
the old one

-Karl
#!/bin/bash
# The FULL path to the index.php file for the VegaDNS server
VEGADNS='http://127.0.0.1/vegadns/index.php'
# NOTE: You can get updates from multiple VegaDNS servers if
# desired. Simply separate them by spaces like so:
# VEGADNS='http://server1/vegadns-x.x/index.php 
http://server2/vegadns-x.x/inde$

# Path to the tinydns directory
TINYDNSDIR=/var/dnscache/tinydns
mv $TINYDNSDIR/root/data $TINYDNSDIR/root/data.old
A=$[0]
for VD in $VEGADNS ; do
    A=$[$A+1]
    wget -q -O "$TINYDNSDIR/root/data.srv-$A" $VD?state=get_data
    cat "$TINYDNSDIR/root/data.srv-$A" >>$TINYDNSDIR/root/data
done
# Don't make if the files havn't changed
OLD=$(sum $TINYDNSDIR/root/data.old)
NEW=$(sum $TINYDNSDIR/root/data)
if [ "$OLD" != "$NEW" ]; then
    (cd $TINYDNSDIR/root ; make -s)
fi