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 branches trunk
svn add *
svn ci -m 'branches trunk'
svn up

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

svn cp trunk branches/dev_branch
svn ci -m 'make a branch'
svn up

cd branches/dev_branch
echo epsilon > epsilon
svn add epsilon
svn ci -m 'Add a file on the branch.'
svn up
cd ../..

cd branches/dev_branch
svn ps 'svn:ignore' 'delta' .
svn ci -m 'Commit bogus propchange.'
svn up
cd ../../..

pwd
svnadmin dump repo > ../branch_prop_edit.svndump
cd ..
echo 'Dump created in branch_prop_edit.svndump. You can probably delete temp.'
exit 0