~bzr-pqm/bzr/bzr.dev

    # Copyright (C) 2005, 2006, 2007 Canonical Ltd
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for the BzrDir facility and any format specific tests.

For interface contract tests, see tests/bzr_dir_implementations.
"""

import os.path
from StringIO import StringIO

from bzrlib import (
    bzrdir,
    errors,
    help_topics,
    repository,
    symbol_versioning,
    urlutils,
    workingtree,
    )
import bzrlib.branch
from bzrlib.errors import (NotBranchError,
                           UnknownFormatError,
                           UnsupportedFormatError,
                           )
from bzrlib.tests import (
    TestCase,
    TestCaseWithTransport,
    test_sftp_transport
    )
from bzrlib.tests.HttpServer import HttpServer
from bzrlib.tests.HTTPTestUtil import (
    TestCaseWithTwoWebservers,
    HTTPServerRedirecting,
    )
from bzrlib.tests.test_http import TestWithTransport_pycurl
from bzrlib.transport import get_transport
from bzrlib.transport.http._urllib import HttpTransport_urllib
from bzrlib.transport.memory import MemoryServer
from bzrlib.repofmt import knitrepo, weaverepo


class TestDefaultFormat(TestCase):

    def test_get_set_default_format(self):
        old_format = bzrdir.BzrDirFormat.get_default_format()
        # default is BzrDirFormat6
        self.failUnless(isinstance(old_format, bzrdir.BzrDirMetaFormat1))
        self.applyDeprecated(symbol_versioning.zero_fourteen, 
                             bzrdir.BzrDirFormat.set_default_format, 
                             SampleBzrDirFormat())
        # creating a bzr dir should now create an instrumented dir.
        try:
            result = bzrdir.BzrDir.create('memory:///')
            self.failUnless(isinstance(result, SampleBzrDir))
        finally:
            self.applyDeprecated(symbol_versioning.zero_fourteen,
                bzrdir.BzrDirFormat.set_default_format, old_format)
        self.assertEqual(old_format, bzrdir.BzrDirFormat.get_default_format())


class TestFormatRegistry(TestCase):

    def make_format_registry(self):
        my_format_registry = bzrdir.BzrDirFormatRegistry()
        my_format_registry.register('weave', bzrdir.BzrDirFormat6,
            'Pre-0.8 format.  Slower and does not support checkouts or shared'
            ' repositories', deprecated=True)
        my_format_registry.register_lazy('lazy', 'bzrlib.bzrdir', 
            'BzrDirFormat6', 'Format registered lazily', deprecated=True)
        my_format_registry.register_metadir('knit',
            'bzrlib.repofmt.knitrepo.RepositoryFormatKnit1',
            'Format using knits',
            )
        my_format_registry.set_default('knit')
        my_format_registry.register_metadir(
            'branch6',
            'bzrlib.repofmt.knitrepo.RepositoryFormatKnit3',
            'Experimental successor to knit.  Use at your own risk.',
            branch_format='bzrlib.branch.BzrBranchFormat6')
        my_format_registry.register_metadir(
            'hidden format',
            'bzrlib.repofmt.knitrepo.RepositoryFormatKnit3',
            'Experimental successor to knit.  Use at your own risk.',
            branch_format='bzrlib.branch.BzrBranchFormat6', hidden=True)
        my_format_registry.register('hiddenweave', bzrdir.BzrDirFormat6,
            'Pre-0.8 format.  Slower and does not support checkouts or shared'
            ' repositories', hidden=True)
        my_format_registry.register_lazy('hiddenlazy', 'bzrlib.bzrdir',
            'BzrDirFormat6', 'Format registered lazily', deprecated=True,
            hidden=True)
        return my_format_registry

    def test_format_registry(self):
        my_format_registry = self.make_format_registry()
        my_bzrdir = my_format_registry.make_bzrdir('lazy')
        self.assertIsInstance(my_bzrdir, bzrdir.BzrDirFormat6)
        my_bzrdir = my_format_registry.make_bzrdir('weave')
        self.assertIsInstance(my_bzrdir, bzrdir.BzrDirFormat6)
        my_bzrdir = my_format_registry.make_bzrdir('default')
        self.assertIsInstance(my_bzrdir.repository_format, 
            knitrepo.RepositoryFormatKnit1)
        my_bzrdir = my_format_registry.make_bzrdir('knit')
        self.assertIsInstance(my_bzrdir.repository_format, 
            knitrepo.RepositoryFormatKnit1)
        my_bzrdir = my_format_registry.make_bzrdir('branch6')
        self.assertIsInstance(my_bzrdir.get_branch_format(),
                              bzrlib.branch.BzrBranchFormat6)

    def test_get_help(self):
        my_format_registry = self.make_format_registry()
        self.assertEqual('Format registered lazily',
                         my_format_registry.get_help('lazy'))
        self.assertEqual('Format using knits', 
                         my_format_registry.get_help('knit'))
        self.assertEqual('Format using knits', 
                         my_format_registry.get_help('default'))
        self.assertEqual('Pre-0.8 format.  Slower and does not support'
                         ' checkouts or shared repositories', 
                         my_format_registry.get_help('weave'))
        
    def test_help_topic(self):
        topics = help_topics.HelpTopicRegistry()
        topics.register('formats', self.make_format_registry().help_topic, 
                        'Directory formats')
        topic = topics.get_detail('formats')
        new, deprecated = topic.split('Deprecated formats')
        self.assertContainsRe(new, 'These formats can be used')
        self.assertContainsRe(new, 
                ':knit:\n    \(native\) \(default\) Format using knits\n')
        self.assertContainsRe(deprecated, 
                ':lazy:\n    \(native\) Format registered lazily\n')
        self.assertNotContainsRe(new, 'hidden')

    def test_set_default_repository(self):
        default_factory = bzrdir.format_registry.get('default')
        old_default = [k for k, v in bzrdir.format_registry.iteritems()
                       if v == default_factory and k != 'default'][0]
        bzrdir.format_registry.set_default_repository('dirstate-with-subtree')
        try:
            self.assertIs(bzrdir.format_registry.get('dirstate-with-subtree'),
                          bzrdir.format_registry.get('default'))
            self.assertIs(
                repository.RepositoryFormat.get_default_format().__class__,
                knitrepo.RepositoryFormatKnit3)
        finally:
            bzrdir.format_registry.set_default_repository(old_default)


class SampleBranch(bzrlib.branch.Branch):
    """A dummy branch for guess what, dummy use."""

    def __init__(self, dir):
        self.bzrdir = dir


class SampleBzrDir(bzrdir.BzrDir):
    """A sample BzrDir implementation to allow testing static methods."""

    def create_repository(self, shared=False):
        """See BzrDir.create_repository."""
        return "A repository"

    def open_repository(self):
        """See BzrDir.open_repository."""
        return "A repository"

    def create_branch(self):
        """See BzrDir.create_branch."""
        return SampleBranch(self)

    def create_workingtree(self):
        """See BzrDir.create_workingtree."""
        return "A tree"


class SampleBzrDirFormat(bzrdir.BzrDirFormat):
    """A sample format

    this format is initializable, unsupported to aid in testing the 
    open and open_downlevel routines.
    """

    def get_format_string(self):
        """See BzrDirFormat.get_format_string()."""
        return "Sample .bzr dir format."

    def initialize(self, url, possible_transports=None):
        """Create a bzr dir."""
        t = get_transport(url, possible_transports)
        t.mkdir('.bzr')
        t.put_bytes('.bzr/branch-format', self.get_format_string())
        return SampleBzrDir(t, self)

    def is_supported(self):
        return False

    def open(self, transport, _found=None):
        return "opened branch."


class TestBzrDirFormat(TestCaseWithTransport):
    """Tests for the BzrDirFormat facility."""

    def test_find_format(self):
        # is the right format object found for a branch?
        # create a branch with a few known format objects.
        # this is not quite the same as 
        t = get_transport(self.get_url())
        self.build_tree(["foo/", "bar/"], transport=t)
        def check_format(format, url):
            format.initialize(url)
            t = get_transport(url)
            found_format = bzrdir.BzrDirFormat.find_format(t)
            self.failUnless(isinstance(found_format, format.__class__))
        check_format(bzrdir.BzrDirFormat5(), "foo")
        check_format(bzrdir.BzrDirFormat6(), "bar")
        
    def test_find_format_nothing_there(self):
        self.assertRaises(NotBranchError,
                          bzrdir.BzrDirFormat.find_format,
                          get_transport('.'))

    def test_find_format_unknown_format(self):
        t = get_transport(self.get_url())
        t.mkdir('.bzr')
        t.put_bytes('.bzr/branch-format', '')
        self.assertRaises(UnknownFormatError,
                          bzrdir.BzrDirFormat.find_format,
                          get_transport('.'))

    def test_register_unregister_format(self):
        format = SampleBzrDirFormat()
        url = self.get_url()
        # make a bzrdir
        format.initialize(url)
        # register a format for it.
        bzrdir.BzrDirFormat.register_format(format)
        # which bzrdir.Open will refuse (not supported)
        self.assertRaises(UnsupportedFormatError, bzrdir.BzrDir.open, url)
        # which bzrdir.open_containing will refuse (not supported)
        self.assertRaises(UnsupportedFormatError, bzrdir.BzrDir.open_containing, url)
        # but open_downlevel will work
        t = get_transport(url)
        self.assertEqual(format.open(t), bzrdir.BzrDir.open_unsupported(url))
        # unregister the format
        bzrdir.BzrDirFormat.unregister_format(format)
        # now open_downlevel should fail too.
        self.assertRaises(UnknownFormatError, bzrdir.BzrDir.open_unsupported, url)

    def test_create_repository(self):
        format = SampleBzrDirFormat()
        repo = bzrdir.BzrDir.create_repository(self.get_url(), format=format)
        self.assertEqual('A repository', repo)

    def test_create_repository_shared(self):
        old_format = bzrdir.BzrDirFormat.get_default_format()
        repo = bzrdir.BzrDir.create_repository('.', shared=True)
        self.assertTrue(repo.is_shared())

    def test_create_repository_nonshared(self):
        old_format = bzrdir.BzrDirFormat.get_default_format()
        repo = bzrdir.BzrDir.create_repository('.')
        self.assertFalse(repo.is_shared())

    def test_create_repository_under_shared(self):
        # an explicit create_repository always does so.
        # we trust the format is right from the 'create_repository test'
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        repo = bzrdir.BzrDir.create_repository(self.get_url('child'),
                                               format=format)
        self.assertTrue(isinstance(repo, repository.Repository))
        self.assertTrue(repo.bzrdir.root_transport.base.endswith('child/'))

    def test_create_branch_and_repo_uses_default(self):
        format = SampleBzrDirFormat()
        branch = bzrdir.BzrDir.create_branch_and_repo(self.get_url(),
                                                      format=format)
        self.assertTrue(isinstance(branch, SampleBranch))

    def test_create_branch_and_repo_under_shared(self):
        # creating a branch and repo in a shared repo uses the
        # shared repository
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        branch = bzrdir.BzrDir.create_branch_and_repo(
            self.get_url('child'), format=format)
        self.assertRaises(errors.NoRepositoryPresent,
                          branch.bzrdir.open_repository)

    def test_create_branch_and_repo_under_shared_force_new(self):
        # creating a branch and repo in a shared repo can be forced to 
        # make a new repo
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        branch = bzrdir.BzrDir.create_branch_and_repo(self.get_url('child'),
                                                      force_new_repo=True,
                                                      format=format)
        branch.bzrdir.open_repository()

    def test_create_standalone_working_tree(self):
        format = SampleBzrDirFormat()
        # note this is deliberately readonly, as this failure should 
        # occur before any writes.
        self.assertRaises(errors.NotLocalUrl,
                          bzrdir.BzrDir.create_standalone_workingtree,
                          self.get_readonly_url(), format=format)
        tree = bzrdir.BzrDir.create_standalone_workingtree('.', 
                                                           format=format)
        self.assertEqual('A tree', tree)

    def test_create_standalone_working_tree_under_shared_repo(self):
        # create standalone working tree always makes a repo.
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        # note this is deliberately readonly, as this failure should 
        # occur before any writes.
        self.assertRaises(errors.NotLocalUrl,
                          bzrdir.BzrDir.create_standalone_workingtree,
                          self.get_readonly_url('child'), format=format)
        tree = bzrdir.BzrDir.create_standalone_workingtree('child', 
            format=format)
        tree.bzrdir.open_repository()

    def test_create_branch_convenience(self):
        # outside a repo the default convenience output is a repo+branch_tree
        format = bzrdir.format_registry.make_bzrdir('knit')
        branch = bzrdir.BzrDir.create_branch_convenience('.', format=format)
        branch.bzrdir.open_workingtree()
        branch.bzrdir.open_repository()

    def test_create_branch_convenience_possible_transports(self):
        """Check that the optional 'possible_transports' is recognized"""
        format = bzrdir.format_registry.make_bzrdir('knit')
        t = self.get_transport()
        branch = bzrdir.BzrDir.create_branch_convenience(
            '.', format=format, possible_transports=[t])
        branch.bzrdir.open_workingtree()
        branch.bzrdir.open_repository()

    def test_create_branch_convenience_root(self):
        """Creating a branch at the root of a fs should work."""
        self.vfs_transport_factory = MemoryServer
        # outside a repo the default convenience output is a repo+branch_tree
        format = bzrdir.format_registry.make_bzrdir('knit')
        branch = bzrdir.BzrDir.create_branch_convenience(self.get_url(), 
                                                         format=format)
        self.assertRaises(errors.NoWorkingTree,
                          branch.bzrdir.open_workingtree)
        branch.bzrdir.open_repository()

    def test_create_branch_convenience_under_shared_repo(self):
        # inside a repo the default convenience output is a branch+ follow the
        # repo tree policy
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        branch = bzrdir.BzrDir.create_branch_convenience('child',
            format=format)
        branch.bzrdir.open_workingtree()
        self.assertRaises(errors.NoRepositoryPresent,
                          branch.bzrdir.open_repository)
            
    def test_create_branch_convenience_under_shared_repo_force_no_tree(self):
        # inside a repo the default convenience output is a branch+ follow the
        # repo tree policy but we can override that
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        branch = bzrdir.BzrDir.create_branch_convenience('child',
            force_new_tree=False, format=format)
        self.assertRaises(errors.NoWorkingTree,
                          branch.bzrdir.open_workingtree)
        self.assertRaises(errors.NoRepositoryPresent,
                          branch.bzrdir.open_repository)
            
    def test_create_branch_convenience_under_shared_repo_no_tree_policy(self):
        # inside a repo the default convenience output is a branch+ follow the
        # repo tree policy
        format = bzrdir.format_registry.make_bzrdir('knit')
        repo = self.make_repository('.', shared=True, format=format)
        repo.set_make_working_trees(False)
        branch = bzrdir.BzrDir.create_branch_convenience('child', 
                                                         format=format)
        self.assertRaises(errors.NoWorkingTree,
                          branch.bzrdir.open_workingtree)
        self.assertRaises(errors.NoRepositoryPresent,
                          branch.bzrdir.open_repository)

    def test_create_branch_convenience_under_shared_repo_no_tree_policy_force_tree(self):
        # inside a repo the default convenience output is a branch+ follow the
        # repo tree policy but we can override that
        format = bzrdir.format_registry.make_bzrdir('knit')
        repo = self.make_repository('.', shared=True, format=format)
        repo.set_make_working_trees(False)
        branch = bzrdir.BzrDir.create_branch_convenience('child',
            force_new_tree=True, format=format)
        branch.bzrdir.open_workingtree()
        self.assertRaises(errors.NoRepositoryPresent,
                          branch.bzrdir.open_repository)

    def test_create_branch_convenience_under_shared_repo_force_new_repo(self):
        # inside a repo the default convenience output is overridable to give
        # repo+branch+tree
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.make_repository('.', shared=True, format=format)
        branch = bzrdir.BzrDir.create_branch_convenience('child',
            force_new_repo=True, format=format)
        branch.bzrdir.open_repository()
        branch.bzrdir.open_workingtree()


class ChrootedTests(TestCaseWithTransport):
    """A support class that provides readonly urls outside the local namespace.

    This is done by checking if self.transport_server is a MemoryServer. if it
    is then we are chrooted already, if it is not then an HttpServer is used
    for readonly urls.
    """

    def setUp(self):
        super(ChrootedTests, self).setUp()
        if not self.vfs_transport_factory == MemoryServer:
            self.transport_readonly_server = HttpServer

    def test_open_containing(self):
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_containing,
                          self.get_readonly_url(''))
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_containing,
                          self.get_readonly_url('g/p/q'))
        control = bzrdir.BzrDir.create(self.get_url())
        branch, relpath = bzrdir.BzrDir.open_containing(self.get_readonly_url(''))
        self.assertEqual('', relpath)
        branch, relpath = bzrdir.BzrDir.open_containing(self.get_readonly_url('g/p/q'))
        self.assertEqual('g/p/q', relpath)

    def test_open_containing_from_transport(self):
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_containing_from_transport,
                          get_transport(self.get_readonly_url('')))
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_containing_from_transport,
                          get_transport(self.get_readonly_url('g/p/q')))
        control = bzrdir.BzrDir.create(self.get_url())
        branch, relpath = bzrdir.BzrDir.open_containing_from_transport(
            get_transport(self.get_readonly_url('')))
        self.assertEqual('', relpath)
        branch, relpath = bzrdir.BzrDir.open_containing_from_transport(
            get_transport(self.get_readonly_url('g/p/q')))
        self.assertEqual('g/p/q', relpath)

    def test_open_containing_tree_or_branch(self):
        def local_branch_path(branch):
             return os.path.realpath(
                urlutils.local_path_from_url(branch.base))

        self.make_branch_and_tree('topdir')
        tree, branch, relpath = bzrdir.BzrDir.open_containing_tree_or_branch(
            'topdir/foo')
        self.assertEqual(os.path.realpath('topdir'),
                         os.path.realpath(tree.basedir))
        self.assertEqual(os.path.realpath('topdir'),
                         local_branch_path(branch))
        self.assertIs(tree.bzrdir, branch.bzrdir)
        self.assertEqual('foo', relpath)
        # opening from non-local should not return the tree
        tree, branch, relpath = bzrdir.BzrDir.open_containing_tree_or_branch(
            self.get_readonly_url('topdir/foo'))
        self.assertEqual(None, tree)
        self.assertEqual('foo', relpath)
        # without a tree:
        self.make_branch('topdir/foo')
        tree, branch, relpath = bzrdir.BzrDir.open_containing_tree_or_branch(
            'topdir/foo')
        self.assertIs(tree, None)
        self.assertEqual(os.path.realpath('topdir/foo'),
                         local_branch_path(branch))
        self.assertEqual('', relpath)

    def test_open_from_transport(self):
        # transport pointing at bzrdir should give a bzrdir with root transport
        # set to the given transport
        control = bzrdir.BzrDir.create(self.get_url())
        transport = get_transport(self.get_url())
        opened_bzrdir = bzrdir.BzrDir.open_from_transport(transport)
        self.assertEqual(transport.base, opened_bzrdir.root_transport.base)
        self.assertIsInstance(opened_bzrdir, bzrdir.BzrDir)
        
    def test_open_from_transport_no_bzrdir(self):
        transport = get_transport(self.get_url())
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_from_transport,
                          transport)

    def test_open_from_transport_bzrdir_in_parent(self):
        control = bzrdir.BzrDir.create(self.get_url())
        transport = get_transport(self.get_url())
        transport.mkdir('subdir')
        transport = transport.clone('subdir')
        self.assertRaises(NotBranchError, bzrdir.BzrDir.open_from_transport,
                          transport)

    def test_sprout_recursive(self):
        tree = self.make_branch_and_tree('tree1', format='dirstate-with-subtree')
        sub_tree = self.make_branch_and_tree('tree1/subtree',
            format='dirstate-with-subtree')
        tree.add_reference(sub_tree)
        self.build_tree(['tree1/subtree/file'])
        sub_tree.add('file')
        tree.commit('Initial commit')
        tree.bzrdir.sprout('tree2')
        self.failUnlessExists('tree2/subtree/file')

    def test_cloning_metadir(self):
        """Ensure that cloning metadir is suitable"""
        bzrdir = self.make_bzrdir('bzrdir')
        bzrdir.cloning_metadir()
        branch = self.make_branch('branch', format='knit')
        format = branch.bzrdir.cloning_metadir()
        self.assertIsInstance(format.workingtree_format,
            workingtree.WorkingTreeFormat3)

    def test_sprout_recursive_treeless(self):
        tree = self.make_branch_and_tree('tree1',
            format='dirstate-with-subtree')
        sub_tree = self.make_branch_and_tree('tree1/subtree',
            format='dirstate-with-subtree')
        tree.add_reference(sub_tree)
        self.build_tree(['tree1/subtree/file'])
        sub_tree.add('file')
        tree.commit('Initial commit')
        tree.bzrdir.destroy_workingtree()
        repo = self.make_repository('repo', shared=True,
            format='dirstate-with-subtree')
        repo.set_make_working_trees(False)
        tree.bzrdir.sprout('repo/tree2')
        self.failUnlessExists('repo/tree2/subtree')
        self.failIfExists('repo/tree2/subtree/file')


class TestMeta1DirFormat(TestCaseWithTransport):
    """Tests specific to the meta1 dir format."""

    def test_right_base_dirs(self):
        dir = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
        t = dir.transport
        branch_base = t.clone('branch').base
        self.assertEqual(branch_base, dir.get_branch_transport(None).base)
        self.assertEqual(branch_base,
                         dir.get_branch_transport(bzrlib.branch.BzrBranchFormat5()).base)
        repository_base = t.clone('repository').base
        self.assertEqual(repository_base, dir.get_repository_transport(None).base)
        self.assertEqual(repository_base,
                         dir.get_repository_transport(weaverepo.RepositoryFormat7()).base)
        checkout_base = t.clone('checkout').base
        self.assertEqual(checkout_base, dir.get_workingtree_transport(None).base)
        self.assertEqual(checkout_base,
                         dir.get_workingtree_transport(workingtree.WorkingTreeFormat3()).base)

    def test_meta1dir_uses_lockdir(self):
        """Meta1 format uses a LockDir to guard the whole directory, not a file."""
        dir = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
        t = dir.transport
        self.assertIsDirectory('branch-lock', t)

    def test_comparison(self):
        """Equality and inequality behave properly.

        Metadirs should compare equal iff they have the same repo, branch and
        tree formats.
        """
        mydir = bzrdir.format_registry.make_bzrdir('knit')
        self.assertEqual(mydir, mydir)
        self.assertFalse(mydir != mydir)
        otherdir = bzrdir.format_registry.make_bzrdir('knit')
        self.assertEqual(otherdir, mydir)
        self.assertFalse(otherdir != mydir)
        otherdir2 = bzrdir.format_registry.make_bzrdir('dirstate-with-subtree')
        self.assertNotEqual(otherdir2, mydir)
        self.assertFalse(otherdir2 == mydir)

    def test_needs_conversion_different_working_tree(self):
        # meta1dirs need an conversion if any element is not the default.
        old_format = bzrdir.BzrDirFormat.get_default_format()
        # test with 
        new_default = bzrdir.format_registry.make_bzrdir('dirstate')
        bzrdir.BzrDirFormat._set_default_format(new_default)
        try:
            tree = self.make_branch_and_tree('tree', format='knit')
            self.assertTrue(tree.bzrdir.needs_format_conversion())
        finally:
            bzrdir.BzrDirFormat._set_default_format(old_format)


class TestFormat5(TestCaseWithTransport):
    """Tests specific to the version 5 bzrdir format."""

    def test_same_lockfiles_between_tree_repo_branch(self):
        # this checks that only a single lockfiles instance is created 
        # for format 5 objects
        dir = bzrdir.BzrDirFormat5().initialize(self.get_url())
        def check_dir_components_use_same_lock(dir):
            ctrl_1 = dir.open_repository().control_files
            ctrl_2 = dir.open_branch().control_files
            ctrl_3 = dir.open_workingtree()._control_files
            self.assertTrue(ctrl_1 is ctrl_2)
            self.assertTrue(ctrl_2 is ctrl_3)
        check_dir_components_use_same_lock(dir)
        # and if we open it normally.
        dir = bzrdir.BzrDir.open(self.get_url())
        check_dir_components_use_same_lock(dir)
    
    def test_can_convert(self):
        # format 5 dirs are convertable
        dir = bzrdir.BzrDirFormat5().initialize(self.get_url())
        self.assertTrue(dir.can_convert_format())
    
    def test_needs_conversion(self):
        # format 5 dirs need a conversion if they are not the default.
        # and they start of not the default.
        old_format = bzrdir.BzrDirFormat.get_default_format()
        bzrdir.BzrDirFormat._set_default_format(bzrdir.BzrDirFormat5())
        try:
            dir = bzrdir.BzrDirFormat5().initialize(self.get_url())
            self.assertFalse(dir.needs_format_conversion())
        finally:
            bzrdir.BzrDirFormat._set_default_format(old_format)
        self.assertTrue(dir.needs_format_conversion())


class TestFormat6(TestCaseWithTransport):
    """Tests specific to the version 6 bzrdir format."""

    def test_same_lockfiles_between_tree_repo_branch(self):
        # this checks that only a single lockfiles instance is created 
        # for format 6 objects
        dir = bzrdir.BzrDirFormat6().initialize(self.get_url())
        def check_dir_components_use_same_lock(dir):
            ctrl_1 = dir.open_repository().control_files
            ctrl_2 = dir.open_branch().control_files
            ctrl_3 = dir.open_workingtree()._control_files
            self.assertTrue(ctrl_1 is ctrl_2)
            self.assertTrue(ctrl_2 is ctrl_3)
        check_dir_components_use_same_lock(dir)
        # and if we open it normally.
        dir = bzrdir.BzrDir.open(self.get_url())
        check_dir_components_use_same_lock(dir)
    
    def test_can_convert(self):
        # format 6 dirs are convertable
        dir = bzrdir.BzrDirFormat6().initialize(self.get_url())
        self.assertTrue(dir.can_convert_format())
    
    def test_needs_conversion(self):
        # format 6 dirs need an conversion if they are not the default.
        old_format = bzrdir.BzrDirFormat.get_default_format()
        bzrdir.BzrDirFormat._set_default_format(bzrdir.BzrDirMetaFormat1())
        try:
            dir = bzrdir.BzrDirFormat6().initialize(self.get_url())
            self.assertTrue(dir.needs_format_conversion())
        finally:
            bzrdir.BzrDirFormat._set_default_format(old_format)


class NotBzrDir(bzrlib.bzrdir.BzrDir):
    """A non .bzr based control directory."""

    def __init__(self, transport, format):
        self._format = format
        self.root_transport = transport
        self.transport = transport.clone('.not')


class NotBzrDirFormat(bzrlib.bzrdir.BzrDirFormat):
    """A test class representing any non-.bzr based disk format."""

    def initialize_on_transport(self, transport):
        """Initialize a new .not dir in the base directory of a Transport."""
        transport.mkdir('.not')
        return self.open(transport)

    def open(self, transport):
        """Open this directory."""
        return NotBzrDir(transport, self)

    @classmethod
    def _known_formats(self):
        return set([NotBzrDirFormat()])

    @classmethod
    def probe_transport(self, transport):
        """Our format is present if the transport ends in '.not/'."""
        if transport.has('.not'):
            return NotBzrDirFormat()


class TestNotBzrDir(TestCaseWithTransport):
    """Tests for using the bzrdir api with a non .bzr based disk format.
    
    If/when one of these is in the core, we can let the implementation tests
    verify this works.
    """

    def test_create_and_find_format(self):
        # create a .notbzr dir 
        format = NotBzrDirFormat()
        dir = format.initialize(self.get_url())
        self.assertIsInstance(dir, NotBzrDir)
        # now probe for it.
        bzrlib.bzrdir.BzrDirFormat.register_control_format(format)
        try:
            found = bzrlib.bzrdir.BzrDirFormat.find_format(
                get_transport(self.get_url()))
            self.assertIsInstance(found, NotBzrDirFormat)
        finally:
            bzrlib.bzrdir.BzrDirFormat.unregister_control_format(format)

    def test_included_in_known_formats(self):
        bzrlib.bzrdir.BzrDirFormat.register_control_format(NotBzrDirFormat)
        try:
            formats = bzrlib.bzrdir.BzrDirFormat.known_formats()
            for format in formats:
                if isinstance(format, NotBzrDirFormat):
                    return
            self.fail("No NotBzrDirFormat in %s" % formats)
        finally:
            bzrlib.bzrdir.BzrDirFormat.unregister_control_format(NotBzrDirFormat)


class NonLocalTests(TestCaseWithTransport):
    """Tests for bzrdir static behaviour on non local paths."""

    def setUp(self):
        super(NonLocalTests, self).setUp()
        self.vfs_transport_factory = MemoryServer
    
    def test_create_branch_convenience(self):
        # outside a repo the default convenience output is a repo+branch_tree
        format = bzrdir.format_registry.make_bzrdir('knit')
        branch = bzrdir.BzrDir.create_branch_convenience(
            self.get_url('foo'), format=format)
        self.assertRaises(errors.NoWorkingTree,
                          branch.bzrdir.open_workingtree)
        branch.bzrdir.open_repository()

    def test_create_branch_convenience_force_tree_not_local_fails(self):
        # outside a repo the default convenience output is a repo+branch_tree
        format = bzrdir.format_registry.make_bzrdir('knit')
        self.assertRaises(errors.NotLocalUrl,
            bzrdir.BzrDir.create_branch_convenience,
            self.get_url('foo'),
            force_new_tree=True,
            format=format)
        t = get_transport(self.get_url('.'))
        self.assertFalse(t.has('foo'))

    def test_clone(self):
        # clone into a nonlocal path works
        format = bzrdir.format_registry.make_bzrdir('knit')
        branch = bzrdir.BzrDir.create_branch_convenience('local',
                                                         format=format)
        branch.bzrdir.open_workingtree()
        result = branch.bzrdir.clone(self.get_url('remote'))
        self.assertRaises(errors.NoWorkingTree,
                          result.open_workingtree)
        result.open_branch()
        result.open_repository()

    def test_checkout_metadir(self):
        # checkout_metadir has reasonable working tree format even when no
        # working tree is present
        self.make_branch('branch-knit2', format='dirstate-with-subtree')
        my_bzrdir = bzrdir.BzrDir.open(self.get_url('branch-knit2'))
        checkout_format = my_bzrdir.checkout_metadir()
        self.assertIsInstance(checkout_format.workingtree_format,
                              workingtree.WorkingTreeFormat3)


class TestHTTPRedirectionLoop(object):
    """Test redirection loop between two http servers.

    This MUST be used by daughter classes that also inherit from
    TestCaseWithTwoWebservers.

    We can't inherit directly from TestCaseWithTwoWebservers or the
    test framework will try to create an instance which cannot
    run, its implementation being incomplete. 
    """

    # Should be defined by daughter classes to ensure redirection
    # still use the same transport implementation (not currently
    # enforced as it's a bit tricky to get right (see the FIXME
    # in BzrDir.open_from_transport for the unique use case so
    # far)
    _qualifier = None

    def create_transport_readonly_server(self):
        return HTTPServerRedirecting()

    def create_transport_secondary_server(self):
        return HTTPServerRedirecting()

    def setUp(self):
        # Both servers redirect to each server creating a loop
        super(TestHTTPRedirectionLoop, self).setUp()
        # The redirections will point to the new server
        self.new_server = self.get_readonly_server()
        # The requests to the old server will be redirected
        self.old_server = self.get_secondary_server()
        # Configure the redirections
        self.old_server.redirect_to(self.new_server.host, self.new_server.port)
        self.new_server.redirect_to(self.old_server.host, self.old_server.port)

    def _qualified_url(self, host, port):
        return 'http+%s://%s:%s' % (self._qualifier, host, port)

    def test_loop(self):
        # Starting from either server should loop
        old_url = self._qualified_url(self.old_server.host, 
                                      self.old_server.port)
        oldt = self._transport(old_url)
        self.assertRaises(errors.NotBranchError,
                          bzrdir.BzrDir.open_from_transport, oldt)
        new_url = self._qualified_url(self.new_server.host, 
                                      self.new_server.port)
        newt = self._transport(new_url)
        self.assertRaises(errors.NotBranchError,
                          bzrdir.BzrDir.open_from_transport, newt)


class TestHTTPRedirections_urllib(TestHTTPRedirectionLoop,
                                  TestCaseWithTwoWebservers):
    """Tests redirections for urllib implementation"""

    _qualifier = 'urllib'
    _transport = HttpTransport_urllib



class TestHTTPRedirections_pycurl(TestWithTransport_pycurl,
                                  TestHTTPRedirectionLoop,
                                  TestCaseWithTwoWebservers):
    """Tests redirections for pycurl implementation"""

    _qualifier = 'pycurl'