git config filter.rot13.smudge ./rot13.sh &&
git config filter.rot13.clean ./rot13.sh &&

{
    echo "*.t filter=rot13" ?!AMP?!
    echo "*.i ident"
} > .gitattributes &&

{
    echo a b c d e f g h i j k l m ?!AMP?!
    echo n o p q r s t u v w x y z ?!AMP?!
    echo '$Id$'
} > test &&
cat test > test.t &&
cat test > test.o &&
cat test > test.i &&
git add test test.t test.i &&
rm -f test test.t test.i &&
git checkout -- test test.t test.i &&

echo "content-test2" > test2.o &&
echo "content-test3 - filename with special characters" > "test3 'sq',$x=.o" ?!AMP?!

downstream_url_for_sed=$(
	printf "%sn" "$downstream_url" |
	sed -e 's/\/\\/g' -e 's/[[/.*^$]/\&/g'
)