~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2007-2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for repository write groups."""

from bzrlib import (

    errors,

    )

from bzrlib.tests import (

    per_repository,

    test_server,

    )

from bzrlib.transport import memory

class TestWriteGroup(per_repository.TestCaseWithRepository):

    def test_start_write_group_unlocked_needs_write_lock(self):

        repo = self.make_repository('.')

        self.assertRaises(errors.NotWriteLocked, repo.start_write_group)

    def test_start_write_group_read_locked_needs_write_lock(self):

        repo = self.make_repository('.')

        repo.lock_read()

        try:

            self.assertRaises(errors.NotWriteLocked, repo.start_write_group)

        finally:

            repo.unlock()

    def test_start_write_group_write_locked_gets_None(self):

        repo = self.make_repository('.')

        repo.lock_write()

        self.assertEqual(None, repo.start_write_group())

        repo.commit_write_group()

        repo.unlock()

    def test_start_write_group_twice_errors(self):

        repo = self.make_repository('.')

        repo.lock_write()

        repo.start_write_group()

        try:

            # don't need a specific exception for now - this is

            # really to be sure it's used right, not for signalling

            # semantic information.

            self.assertRaises(errors.BzrError, repo.start_write_group)

        finally:

            repo.commit_write_group()

            repo.unlock()

    def test_commit_write_group_does_not_error(self):

        repo = self.make_repository('.')

        repo.lock_write()

        repo.start_write_group()

        # commit_write_group can either return None (for repositories without

        # isolated transactions) or a hint for pack(). So we only check it

        # works in this interface test, because all repositories are exercised.

        repo.commit_write_group()

        repo.unlock()

    def test_unlock_in_write_group(self):

        repo = self.make_repository('.')

        repo.lock_write()

        repo.start_write_group()

        # don't need a specific exception for now - this is

        # really to be sure it's used right, not for signalling

        # semantic information.

        self.assertLogsError(errors.BzrError, repo.unlock)

        # after this error occurs, the repository is unlocked, and the write

        # group is gone.  you've had your chance, and you blew it. ;-)

        self.assertFalse(repo.is_locked())

        self.assertRaises(errors.BzrError, repo.commit_write_group)

        self.assertRaises(errors.BzrError, repo.unlock)

    def test_is_in_write_group(self):

        repo = self.make_repository('.')

        self.assertFalse(repo.is_in_write_group())

        repo.lock_write()

        repo.start_write_group()

        self.assertTrue(repo.is_in_write_group())

        repo.commit_write_group()

        self.assertFalse(repo.is_in_write_group())

        # abort also removes the in_write_group status.

        repo.start_write_group()

        self.assertTrue(repo.is_in_write_group())

        repo.abort_write_group()

        self.assertFalse(repo.is_in_write_group())

        repo.unlock()

    def test_abort_write_group_gets_None(self):

        repo = self.make_repository('.')

        repo.lock_write()

        repo.start_write_group()

        self.assertEqual(None, repo.abort_write_group())

        repo.unlock()

    def test_abort_write_group_does_not_raise_when_suppressed(self):

        if self.transport_server is test_server.LocalURLServer:

            self.transport_server = None

        self.vfs_transport_factory = memory.MemoryServer

        repo = self.make_repository('repo')

        token = repo.lock_write()

        self.addCleanup(repo.unlock)

        repo.start_write_group()

        # Damage the repository on the filesystem

        t = self.get_transport('')

        t.rename('repo', 'foo')

        self.addCleanup(t.rename, 'foo', 'repo')

        # abort_write_group will not raise an error, because either an

        # exception was not generated, or the exception was caught and

        # suppressed.  See also test_pack_repository's test of the same name.

        self.assertEqual(None, repo.abort_write_group(suppress_errors=True))