layouts: fix crash when importing hgsubversion itself (issue #402) Mercurial extensions are a bit weird: they aren't normally in sys.path, so you can't assume that "import hgsubversion" works. Luckily, Mercurial sneaks a little treat into sys.modules so that "import hgext_hgsubversion" does work. In fact, to get things working *as a Mercurial extension*, all that's needed is that trivial change to two import lines, in layouts/detect.py and layouts/standard.py. Unfortunately, hgsubversion is also imported as a Python module, in its own test suite. In that context, there is no "hgext_" trick -- unless we do it in ourselves, which I've done in TestBase.setUp(). That would work fine ... except that test_util imports from hgsubversion, which ends up importing hgsubversion.layouts.{detect,standard}, which want the "hgext_" trick to work. But it hasn't been done yet when we're still importing; it doesn't happen until setUp() runs. So make those two imports happen late, in the functions that need them. Incidentally, this is only necessary to support Mercurial <= 2.7. Mercurial got a bit smarter in 2.8: http://selenic.com/repo/hg/rev/621a26eb3a99

#!/bin/sh
mkdir temp
cd temp
svnadmin create repo
svn co file://`pwd`/repo wc

cd wc
mkdir brances trunk tags
svn add *
svn ci -m 'btt'

cd trunk
for a in alpha beta gamma delta ; do
    echo $a > $a
    svn add $a
done
svn ci -m 'Add files.'

cd ..
svn up
svn cp trunk brances/dev_branch
svn ci -m 'branch'

cd brances/dev_branch
svn rm delta
echo narf > alpha
echo iota > iota
svn add iota
svn ci -m 'branch changes'

cd ../..
svn up
svn mv brances branches
svn ci -m 'move branches to branches'

cd ..
cd ..

svnadmin dump temp/repo > rename_branch_parent_dir.svndump
echo
echo 'Complete.'
echo 'You probably want to clean up temp now.'
echo 'Dump in rename_branch_parent_dir.svndump'
exit 0