tests/test-pull-permission

make hook code nicer.
pre hooks can raise exception if fail.
tidy up better if exception raised (like KeyboardInterrupt) when running
hook program.

#!/bin/sh

mkdir a
cd a
hg init
echo foo > b
hg add b
hg ci -m "b" -d "0 0"

chmod -w .hg

cd ..

hg clone a b
cd b
hg verify

cd ..

chmod +w a/.hg # let test clean up