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
#
# Generate unrelatedbranch.svndump
#

mkdir temp
cd temp

mkdir project-orig
cd project-orig
mkdir trunk
mkdir branches
cd ..

svnadmin create testrepo
svnurl=file://`pwd`/testrepo
svn import project-orig $svnurl -m "init project"

svn co $svnurl project
cd project/trunk
echo a > a
svn add a
svn ci -m "add a in trunk"
cd ../branches
# Create an unrelated branch with another file. It used to lead the converter
# to think branch1 was a copy of trunk, even without copy information.
mkdir branch1
echo b > branch1/b
svn add branch1
svn ci -m "add b in branch1"
# Make a real branch too for comparison
svn cp ../trunk branch2
echo b > branch2/b
svn add branch2/b
svn ci -m "add b to branch2"
# Add a file in the branch root for fun
echo c > c
svn add c
svn ci -m "add c in branches/"
# Even update it
echo c >> c
svn ci -m "change c"
cd ../..

svnadmin dump testrepo > ../unrelatedbranch.svndump