#! /bin/sh

# magic-upd -- adds /etc/magic.local to /etc/magic if necessary
# $Id: magic-upd,v 1.2 1998/07/12 18:22:21 cdua Exp cdua $
# Carlos Duarte, 970929/980712

if test $# -ne 0 ; then
	echo "\
usage: $0
  if /etc/magic.local exists and contains new entries
  not on /etc/magic, then this late is appended, but
  with care for not having duplicated information

  notes: /etc/magic.local, must start with the line
      # magic.local ... 
	 /etc/magic should not have a line like that

	 usually, this is not a problem
"
	exit 1
fi

nothing () {
	echo Nothing to update.
	exit 
}

test -f /etc/magic.local || nothing
test -f /etc/magic       || nothing

# does test supports -ot -- older than -- operator?
test /etc/magic -ot /etc/magic.local || nothing

echo Extracting original magic file... 
sed -n -e '/^# magic\.local/q' -e p < /etc/magic > /tmp/xa.$$.

echo Adding local stuff... 
cat /etc/magic.local >> /tmp/xa.$$. 

echo Updating new magic file... 
rm /etc/magic && mv /tmp/xa.$$. /etc/magic

exit