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
# inspired by Python r62868

mkdir temp
cd temp
svnadmin create repo
svn co file://`pwd`/repo wc
export REPO=file://`pwd`/repo
cd wc
mkdir branches trunk tags
svn add *
svn ci -m 'btt'

echo a > trunk/a
svn add trunk/a
svn ci -m 'Add file.'
svn up

svn cp trunk branches/test
svn ci -m 'Branch.'
svn up

cd ..
svn cp -m 'First tag.' $REPO/branches/test@3 $REPO/tags/test-0.1
svn cp -m 'Weird tag.' $REPO/branches/test@3 $REPO/tags/test-0.1/test
svn mv -m 'Fix tag pt 1.' $REPO/tags/test-0.1/test $REPO/tags/test-0.1-real
svn rm -m 'Remove weird.' $REPO/tags/test-0.1
svn mv -m 'Fix tag pt 2.' $REPO/tags/test-0.1-real $REPO/tags/test-0.1

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