On Windows look for mercurial.ini in $USERPROFILE, too, if available as os.path.expanduser('~') does not always yield a useful directory. Based on a patch from Edouard Gomez <ed.gomez@free.fr>

#!/bin/sh

mkdir a
cd a
hg init
echo foo > b
hg add b
hg ci -m "b" -d "1000000 0"

chmod -w .hg

cd ..

hg clone a b

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

cd b
hg verify