slackbuilds/network/knock/doinst.sh

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config() {
NEW="$1"
OLD="$(dirname $NEW)/$(basename $NEW .new)"
# If there's no config file by that name, mv it over:
if [ ! -r $OLD ]; then
mv $NEW $OLD
elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
# toss the redundant copy
rm $NEW
fi
# Otherwise, we leave the .new copy for the admin to consider...
}
# Keep same permissions on rc.knockd.new as an existing rc.knockd:
if [ -e etc/rc.d/rc.knockd ]; then
cp -a etc/rc.d/rc.knockd etc/rc.d/rc.knockd.new.incoming
cat etc/rc.d/rc.knockd.new > etc/rc.d/rc.knockd.new.incoming
mv etc/rc.d/rc.knockd.new.incoming etc/rc.d/rc.knockd.new
else
# If rc.knockd does not exist, make the new one executable by default,
# which won't matter unless it's called from rc.local anyway
chmod 0755 etc/rc.d/rc.knockd.new
fi
config etc/rc.d/rc.knockd.new
config etc/knockd.conf.new