#! /bin/sh -e

base=${CTF_BASE:-/var/lib/ctf}
www=${CTF_BASE:-/var/www}
pass=$base/pass
img=$www/bkup.png
time=$(date +%s)
output=bkup-${time}.png

if [ ! -e $img -o ! -e $pass ]; then
    exit 0
fi

# clean up all other backup images
if ls $www/bkup-*.png >/dev/null 2>&1 ; then
    rm $www/bkup-*.png
fi

# This is a tested method.
#(cat $img; tar -cf - $base 2>/dev/null | gzip -c ) > $www/$output

# This is not a tested method.
(cat $img; tar -cvf - $base 2>/dev/null | gzip -c | rc4 3< $pass) > $www/$output

echo $output