#!/bin/sh

# Process a gst-plugins-ugly tarball to remove
# unwanted GStreamer plugins.
#
# See https://bugzilla.redhat.com/show_bug.cgi?id=1397261
# for details
#
# Bastien Nocera <bnocera@redhat.com> - 2010
# Yaakov Selkowitz <yselkowi@redhat.com> - 2016
#

SOURCE="$1"
NEW_SOURCE=`echo $SOURCE | sed 's/ugly-/ugly-free-/'`
DIRECTORY=`echo $SOURCE | sed 's/\.tar\.xz//'`

ALLOWED="
xingmux
"

NOT_ALLOWED="
asfdemux
dvdlpcmdec
dvdsub
realmedia
"

error()
{
	MESSAGE=$1
	echo $MESSAGE
	exit 1
}

check_allowed()
{
	MODULE=$1
	for i in $ALLOWED ; do
		if test x$MODULE = x$i ; then
			return 0;
		fi
	done
	# Ignore errors coming from ext/ directory
	# they require external libraries so are ineffective anyway
	return 1;
}

check_not_allowed()
{
	MODULE=$1
	for i in $NOT_ALLOWED ; do
		if test x$MODULE = x$i ; then
			return 0;
		fi
	done
	return 1;
}

rm -rf $DIRECTORY
tar xJf $SOURCE || error "Cannot unpack $SOURCE"
pushd $DIRECTORY > /dev/null || error "Cannot open directory \"$DIRECTORY\""

unknown=""
for subdir in gst ext; do
	for dir in $subdir/* ; do
		# Don't touch non-directories
		if ! [ -d $dir ] ; then
			continue;
		fi
		MODULE=`basename $dir`
		if ( check_not_allowed $MODULE ) ; then
			echo "**** Removing $MODULE ****"
			echo "Removing directory $dir"
			rm -r $dir || error "Cannot remove $dir"
			echo
		elif test $subdir = ext  || test $subdir = sys; then
			# Ignore library or system non-blacklisted plugins
			continue;
		elif ! ( check_allowed $MODULE ) ; then
			echo "Unknown module in $dir"
			unknown="$unknown $dir"
		fi
	done
done

echo

if test "x$unknown" != "x"; then
  echo -n "Aborting due to unknown modules: "
  echo "$unknown" | sed "s/ /\n  /g"
  exit 1
fi

popd > /dev/null

tar cJf $NEW_SOURCE $DIRECTORY
echo "$NEW_SOURCE is ready to use"