/brz/remove-bazaar

# (C) 2005, 2006 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 bzrdir implementations - tests a bzrdir format."""

import os

from stat import *

import sys

import bzrlib.branch

import bzrlib.bzrdir as bzrdir

from bzrlib.branch import Branch, needs_read_lock, needs_write_lock

from bzrlib.check import check

from bzrlib.commit import commit

import bzrlib.errors as errors

from bzrlib.errors import (FileExists,

                           NoSuchRevision,

                           NoSuchFile,

                           UninitializableFormat,

                           NotBranchError,

                           )

import bzrlib.repository as repository

from bzrlib.tests import (

                          ChrootedTestCase,

                          TestCase,

                          TestCaseWithTransport,

                          TestSkipped,

                          )

from bzrlib.trace import mutter

import bzrlib.transactions as transactions

import bzrlib.transport as transport

from bzrlib.transport import get_transport

import bzrlib.ui as ui

from bzrlib.upgrade import upgrade

import bzrlib.workingtree as workingtree

class TestCaseWithBzrDir(TestCaseWithTransport):

    def setUp(self):

        super(TestCaseWithBzrDir, self).setUp()

        self.bzrdir = None

    def get_bzrdir(self):

        if self.bzrdir is None:

            self.bzrdir = self.make_bzrdir(None)

        return self.bzrdir

    def make_bzrdir(self, relpath, format=None):

        return super(TestCaseWithBzrDir, self).make_bzrdir(

            relpath, format=self.bzrdir_format)

class TestBzrDir(TestCaseWithBzrDir):

    # Many of these tests test for disk equality rather than checking

    # for semantic equivalence. This works well for some tests but

    # is not good at handling changes in representation or the addition

    # or removal of control data. It would be nice to for instance:

    # sprout a new branch, check that the nickname has been reset by hand

    # and then set the nickname to match the source branch, at which point

    # a semantic equivalence should pass

    def assertDirectoriesEqual(self, source, target, ignore_list=[]):

        """Assert that the content of source and target are identical.

        paths in ignore list will be completely ignored.

        We ignore paths that represent data which is allowed to change during

        a clone or sprout: for instance, inventory.knit contains gzip fragements

        which have timestamps in them, and as we have read the inventory from 

        the source knit, the already-read data is recompressed rather than

        reading it again, which leads to changed timestamps. This is ok though,

        because the inventory.kndx file is not ignored, and the integrity of

        knit joins is tested by test_knit and test_versionedfile.

        """

        files = []

        directories = ['.']

        while directories:

            dir = directories.pop()

            for path in source.list_dir(dir):

                path = dir + '/' + path

                if path in ignore_list:

                    continue

                stat = source.stat(path)

                if S_ISDIR(stat.st_mode):

                    self.assertTrue(S_ISDIR(target.stat(path).st_mode))

                    directories.append(path)

                else:

                    self.assertEqualDiff(source.get(path).read(),

                                         target.get(path).read(),

                                         "text for file %r differs:\n" % path)

    def test_clone_bzrdir_empty(self):

        dir = self.make_bzrdir('source')

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport)

    def test_clone_bzrdir_empty_force_new_ignored(self):

        # the force_new_repo parameter should have no effect on an empty

        # bzrdir's clone logic

        dir = self.make_bzrdir('source')

        target = dir.clone(self.get_url('target'), force_new_repo=True)

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport)

    def test_clone_bzrdir_repository(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        dir = self.make_bzrdir('source')

        repo = dir.create_repository()

        repo.fetch(tree.branch.repository)

        self.assertTrue(repo.has_revision('1'))

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_repository_under_shared(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        dir = self.make_bzrdir('source')

        repo = dir.create_repository()

        repo.fetch(tree.branch.repository)

        self.assertTrue(repo.has_revision('1'))

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.clone(self.get_url('target/child'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertRaises(errors.NoRepositoryPresent, target.open_repository)

    def test_clone_bzrdir_repository_branch_both_under_shared(self):

        try:

            shared_repo = self.make_repository('shared', shared=True)

        except errors.IncompatibleFormat:

            return

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        tree.bzrdir.open_repository().copy_content_into(shared_repo)

        dir = self.make_bzrdir('shared/source')

        dir.create_branch()

        target = dir.clone(self.get_url('shared/target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertNotEqual(dir.transport.base, shared_repo.bzrdir.transport.base)

        self.assertTrue(shared_repo.has_revision('1'))

    def test_clone_bzrdir_repository_under_shared_force_new_repo(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        dir = self.make_bzrdir('source')

        repo = dir.create_repository()

        repo.fetch(tree.branch.repository)

        self.assertTrue(repo.has_revision('1'))

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.clone(self.get_url('target/child'), force_new_repo=True)

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_repository_revision(self):

        # test for revision limiting, [smoke test, not corner case checks].

        # make a repository with some revisions,

        # and clone it with a revision limit.

        # 

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        source = self.make_repository('source')

        tree.bzrdir.open_repository().copy_content_into(source)

        dir = source.bzrdir

        target = dir.clone(self.get_url('target'), revision_id='2')

        raise TestSkipped('revision limiting not strict yet')

    def test_clone_bzrdir_branch_and_repo(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        dir = source.bzrdir

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_branch_and_repo_into_shared_repo(self):

        # by default cloning into a shared repo uses the shared repo.

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        dir = source.bzrdir

        target = dir.clone(self.get_url('target/child'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertRaises(errors.NoRepositoryPresent, target.open_repository)

        self.assertEqual(source.revision_history(),

                         target.open_branch().revision_history())

    def test_clone_bzrdir_branch_and_repo_into_shared_repo_force_new_repo(self):

        # by default cloning into a shared repo uses the shared repo.

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        dir = source.bzrdir

        target = dir.clone(self.get_url('target/child'), force_new_repo=True)

        self.assertNotEqual(dir.transport.base, target.transport.base)

        target.open_repository()

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_branch_reference(self):

        # cloning should preserve the reference status of the branch in a bzrdir

        referenced_branch = self.make_branch('referencced')

        dir = self.make_bzrdir('source')

        try:

            reference = bzrlib.branch.BranchReferenceFormat().initialize(dir,

                referenced_branch)

        except errors.IncompatibleFormat:

            # this is ok too, not all formats have to support references.

            return

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_branch_revision(self):

        # test for revision limiting, [smoke test, not corner case checks].

        # make a branch with some revisions,

        # and clone it with a revision limit.

        # 

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.commit('revision 2', rev_id='2', allow_pointless=True)

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        dir = source.bzrdir

        target = dir.clone(self.get_url('target'), revision_id='1')

        self.assertEqual('1', target.open_branch().last_revision())

    def test_clone_bzrdir_tree_branch_repo(self):

        tree = self.make_branch_and_tree('sourcce')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        dir = tree.bzrdir

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/repository/inventory.knit',

                                     ])

        target.open_workingtree().revert([])

    def test_revert_inventory(self):

        tree = self.make_branch_and_tree('sourcce')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        dir = tree.bzrdir

        target = dir.clone(self.get_url('target'))

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/repository/inventory.knit',

                                     ])

        target.open_workingtree().revert([])

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_tree_branch_reference(self):

        # a tree with a branch reference (aka a checkout) 

        # should stay a checkout on clone.

        referenced_branch = self.make_branch('referencced')

        dir = self.make_bzrdir('source')

        try:

            reference = bzrlib.branch.BranchReferenceFormat().initialize(dir,

                referenced_branch)

        except errors.IncompatibleFormat:

            # this is ok too, not all formats have to support references.

            return

        dir.create_workingtree()

        target = dir.clone(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/repository/inventory.knit',

                                     ])

    def test_clone_bzrdir_tree_revision(self):

        # test for revision limiting, [smoke test, not corner case checks].

        # make a tree with a revision with a last-revision

        # and clone it with a revision limit.

        # This smoke test just checks the revision-id is right. Tree specific

        # tests will check corner cases.

        tree = self.make_branch_and_tree('source')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.commit('revision 2', rev_id='2', allow_pointless=True)

        dir = tree.bzrdir

        target = dir.clone(self.get_url('target'), revision_id='1')

        self.assertEqual('1', target.open_workingtree().last_revision())

    def test_clone_bzrdir_incomplete_source_with_basis(self):

        # ensure that basis really does grab from the basis by having incomplete source

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        source = self.make_branch_and_tree('source')

        # this gives us an incomplete repository

        tree.bzrdir.open_repository().copy_content_into(source.branch.repository)

        tree.commit('revision 2', rev_id='2', allow_pointless=True)

        tree.bzrdir.open_branch().copy_content_into(source.branch)

        tree.copy_content_into(source)

        self.assertFalse(source.branch.repository.has_revision('2'))

        dir = source.bzrdir

        target = dir.clone(self.get_url('target'), basis=tree.bzrdir)

        self.assertEqual('2', target.open_branch().last_revision())

        self.assertEqual('2', target.open_workingtree().last_revision())

        self.assertTrue(target.open_branch().repository.has_revision('2'))

    def test_sprout_bzrdir_empty(self):

        dir = self.make_bzrdir('source')

        target = dir.sprout(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        # creates a new repository branch and tree

        target.open_repository()

        target.open_branch()

        target.open_workingtree()

    def test_sprout_bzrdir_empty_under_shared_repo(self):

        # sprouting an empty dir into a repo uses the repo

        dir = self.make_bzrdir('source')

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'))

        self.assertRaises(errors.NoRepositoryPresent, target.open_repository)

        target.open_branch()

        target.open_workingtree()

    def test_sprout_bzrdir_empty_under_shared_repo(self):

        # the force_new_repo parameter should force use of a new repo in an empty

        # bzrdir's sprout logic

        dir = self.make_bzrdir('source')

        try:

            self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'), force_new_repo=True)

        target.open_repository()

        target.open_branch()

        target.open_workingtree()

    def test_sprout_bzrdir_repository(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        dir = self.make_bzrdir('source')

        repo = dir.create_repository()

        repo.fetch(tree.branch.repository)

        self.assertTrue(repo.has_revision('1'))

        target = dir.sprout(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/repository/inventory.knit',

                                     ])

    def test_sprout_bzrdir_with_repository_to_shared(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        source = self.make_repository('source')

        tree.bzrdir.open_repository().copy_content_into(source)

        dir = source.bzrdir

        try:

            shared_repo = self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertTrue(shared_repo.has_revision('1'))

    def test_sprout_bzrdir_repository_branch_both_under_shared(self):

        try:

            shared_repo = self.make_repository('shared', shared=True)

        except errors.IncompatibleFormat:

            return

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        tree.bzrdir.open_repository().copy_content_into(shared_repo)

        dir = self.make_bzrdir('shared/source')

        dir.create_branch()

        target = dir.sprout(self.get_url('shared/target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertNotEqual(dir.transport.base, shared_repo.bzrdir.transport.base)

        self.assertTrue(shared_repo.has_revision('1'))

    def test_sprout_bzrdir_repository_under_shared_force_new_repo(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        source = self.make_repository('source')

        tree.bzrdir.open_repository().copy_content_into(source)

        dir = source.bzrdir

        try:

            shared_repo = self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'), force_new_repo=True)

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertFalse(shared_repo.has_revision('1'))

    def test_sprout_bzrdir_repository_revision(self):

        # test for revision limiting, [smoke test, not corner case checks].

        # make a repository with some revisions,

        # and sprout it with a revision limit.

        # 

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        tree.bzrdir.open_branch().set_revision_history([])

        tree.set_last_revision(None)

        tree.commit('revision 2', rev_id='2')

        source = self.make_repository('source')

        tree.bzrdir.open_repository().copy_content_into(source)

        dir = source.bzrdir

        target = dir.sprout(self.get_url('target'), revision_id='2')

        raise TestSkipped('revision limiting not strict yet')

    def test_sprout_bzrdir_branch_and_repo(self):

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        dir = source.bzrdir

        target = dir.sprout(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertDirectoriesEqual(dir.root_transport, target.root_transport,

                                    ['./.bzr/stat-cache',

                                     './.bzr/checkout/stat-cache',

                                     './.bzr/inventory',

                                     './.bzr/checkout/inventory',

                                     './.bzr/repository/inventory.knit',

                                     ])

    def test_sprout_bzrdir_branch_and_repo_shared(self):

        # sprouting a branch with a repo into a shared repo uses the shared

        # repo

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        dir = source.bzrdir

        try:

            shared_repo = self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'))

        self.assertTrue(shared_repo.has_revision('1'))

    def test_sprout_bzrdir_branch_and_repo_shared_force_new_repo(self):

        # sprouting a branch with a repo into a shared repo uses the shared

        # repo

        tree = self.make_branch_and_tree('commit_tree')

        self.build_tree(['foo'], transport=tree.bzrdir.transport.clone('..'))

        tree.add('foo')

        tree.commit('revision 1', rev_id='1')

        source = self.make_branch('source')

        tree.bzrdir.open_repository().copy_content_into(source.repository)

        tree.bzrdir.open_branch().copy_content_into(source)

        dir = source.bzrdir

        try:

            shared_repo = self.make_repository('target', shared=True)

        except errors.IncompatibleFormat:

            return

        target = dir.sprout(self.get_url('target/child'), force_new_repo=True)

        self.assertNotEqual(dir.transport.base, target.transport.base)

        self.assertFalse(shared_repo.has_revision('1'))

    def test_sprout_bzrdir_branch_reference(self):

        # sprouting should create a repository if needed and a sprouted branch.

        referenced_branch = self.make_branch('referencced')

        dir = self.make_bzrdir('source')

        try:

            reference = bzrlib.branch.BranchReferenceFormat().initialize(dir,

                referenced_branch)

        except errors.IncompatibleFormat:

            # this is ok too, not all formats have to support references.

            return

        self.assertRaises(errors.NoRepositoryPresent, dir.open_repository)

        target = dir.sprout(self.get_url('target'))

        self.assertNotEqual(dir.transport.base, target.transport.base)

        # we want target to have a branch that is in-place.

        self.assertEqual(target, target.open_branch().bzrdir)

        # and as we dont support repositories being detached yet, a repo in 

        # place

        target.open_repository()

    def test_sprout_bzrdir_branch_reference_shared(self):

        # sprouting should create a repository if needed and a sprouted branch.

        referenced_tree = self.make_branch_and_tree('referenced')

        referenced_tree.commit('1', rev_id='1', allow_pointless=True)

        dir = self.make_bzrdir('source')

        try:

            reference = bzrlib.branch.BranchReferenceFormat().initialize(dir,

                referenced_tree.branch)

        except errors.IncompatibleFormat:

            # this is ok too, not all formats have to support references.

            return

        self.assertRaises(errors.NoRepositoryPresent, dir.open_repository)

        try: