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

import os
import sys
import test_util
import unittest

from mercurial import hg
from mercurial import commands
from mercurial import util


class TestSvnPreCommitHooks(test_util.TestBase):
    def setUp(self):
        super(TestSvnPreCommitHooks, self).setUp()
        self.repo_path = self.load_and_fetch('single_rev.svndump')[1]
        # creating pre-commit hook that doesn't allow any commit
        hook_file_name = os.path.join(
			self.repo_path, 'hooks', 'pre-commit'
        )
        hook_file = open(hook_file_name, 'w')
        hook_file.write(
        	'#!/bin/sh\n'
        	'echo "Commits are not allowed" >&2; exit 1;\n'
        )
        hook_file.close()
        os.chmod(hook_file_name, 0755)

    def test_push_with_pre_commit_hooks(self):
        changes = [('narf/a', 'narf/a', 'ohai',),
                   ]
        self.commitchanges(changes)
        self.assertRaises(util.Abort, self.pushrevisions)