~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005-2011 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

import bzrlib

from bzrlib import (

    errors,

    lockdir,

    osutils,

    transport,

    )

from bzrlib.lockable_files import LockableFiles, TransportLock

from bzrlib.tests import (

    TestCaseInTempDir,

    TestNotApplicable,

    )

from bzrlib.tests.test_smart import TestCaseWithSmartMedium

from bzrlib.tests.test_transactions import DummyWeave

from bzrlib.transactions import (PassThroughTransaction,

                                 ReadOnlyTransaction,

                                 WriteTransaction,

                                 )

# these tests are applied in each parameterized suite for LockableFiles

#

# they use an old style of parameterization, but we want to remove this class

# so won't modernize them now. - mbp 20080430

class _TestLockableFiles_mixin(object):

    def test_transactions(self):

        self.assertIs(self.lockable.get_transaction().__class__,

                      PassThroughTransaction)

        self.lockable.lock_read()

        try:

            self.assertIs(self.lockable.get_transaction().__class__,

                          ReadOnlyTransaction)

        finally:

            self.lockable.unlock()

        self.assertIs(self.lockable.get_transaction().__class__,

                      PassThroughTransaction)

        self.lockable.lock_write()

        self.assertIs(self.lockable.get_transaction().__class__,

                      WriteTransaction)

        # check that finish is called:

        vf = DummyWeave('a')

        self.lockable.get_transaction().register_dirty(vf)

        self.lockable.unlock()

        self.assertTrue(vf.finished)

    def test__escape(self):

        self.assertEqual('%25', self.lockable._escape('%'))

    def test__escape_empty(self):

        self.assertEqual('', self.lockable._escape(''))

    def test_break_lock(self):

        # some locks are not breakable

        self.lockable.lock_write()

        try:

            self.assertRaises(AssertionError, self.lockable.break_lock)

        except NotImplementedError:

            # this lock cannot be broken

            self.lockable.unlock()

            raise TestNotApplicable("%r is not breakable" % (self.lockable,))

        l2 = self.get_lockable()

        orig_factory = bzrlib.ui.ui_factory

        # silent ui - no need for stdout

        bzrlib.ui.ui_factory = bzrlib.ui.CannedInputUIFactory([True])

        try:

            l2.break_lock()

        finally:

            bzrlib.ui.ui_factory = orig_factory

        try:

            l2.lock_write()

            l2.unlock()

        finally:

            self.assertRaises(errors.LockBroken, self.lockable.unlock)

            self.assertFalse(self.lockable.is_locked())

    def test_lock_write_returns_None_refuses_token(self):

        token = self.lockable.lock_write()

        self.addCleanup(self.lockable.unlock)

        if token is not None:

            # This test does not apply, because this lockable supports

            # tokens.

            raise TestNotApplicable("%r uses tokens" % (self.lockable,))

        self.assertRaises(errors.TokenLockingNotSupported,

                          self.lockable.lock_write, token='token')

    def test_lock_write_returns_token_when_given_token(self):

        token = self.lockable.lock_write()

        self.addCleanup(self.lockable.unlock)

        if token is None:

            # This test does not apply, because this lockable refuses

            # tokens.

            return

        new_lockable = self.get_lockable()

        token_from_new_lockable = new_lockable.lock_write(token=token)

        self.addCleanup(new_lockable.unlock)

        self.assertEqual(token, token_from_new_lockable)

    def test_lock_write_raises_on_token_mismatch(self):

        token = self.lockable.lock_write()

        self.addCleanup(self.lockable.unlock)

        if token is None:

            # This test does not apply, because this lockable refuses

            # tokens.

            return

        different_token = token + 'xxx'

        # Re-using the same lockable instance with a different token will

        # raise TokenMismatch.

        self.assertRaises(errors.TokenMismatch,

                          self.lockable.lock_write, token=different_token)

        # A separate instance for the same lockable will also raise

        # TokenMismatch.

        # This detects the case where a caller claims to have a lock (via

        # the token) for an external resource, but doesn't (the token is

        # different).  Clients need a separate lock object to make sure the

        # external resource is probed, whereas the existing lock object

        # might cache.

        new_lockable = self.get_lockable()

        self.assertRaises(errors.TokenMismatch,

                          new_lockable.lock_write, token=different_token)

    def test_lock_write_with_matching_token(self):

        # If the token matches, so no exception is raised by lock_write.

        token = self.lockable.lock_write()

        self.addCleanup(self.lockable.unlock)

        if token is None:

            # This test does not apply, because this lockable refuses

            # tokens.

            return

        # The same instance will accept a second lock_write if the specified

        # token matches.

        self.lockable.lock_write(token=token)

        self.lockable.unlock()

        # Calling lock_write on a new instance for the same lockable will

        # also succeed.

        new_lockable = self.get_lockable()

        new_lockable.lock_write(token=token)

        new_lockable.unlock()

    def test_unlock_after_lock_write_with_token(self):

        # If lock_write did not physically acquire the lock (because it was

        # passed a token), then unlock should not physically release it.

        token = self.lockable.lock_write()

        self.addCleanup(self.lockable.unlock)

        if token is None:

            # This test does not apply, because this lockable refuses

            # tokens.

            return

        new_lockable = self.get_lockable()

        new_lockable.lock_write(token=token)

        new_lockable.unlock()

        self.assertTrue(self.lockable.get_physical_lock_status())

    def test_lock_write_with_token_fails_when_unlocked(self):

        # Lock and unlock to get a superficially valid token.  This mimics a

        # likely programming error, where a caller accidentally tries to lock

        # with a token that is no longer valid (because the original lock was

        # released).

        token = self.lockable.lock_write()

        self.lockable.unlock()

        if token is None:

            # This test does not apply, because this lockable refuses

            # tokens.

            return

        self.assertRaises(errors.TokenMismatch,

                          self.lockable.lock_write, token=token)

    def test_lock_write_reenter_with_token(self):

        token = self.lockable.lock_write()

        try:

            if token is None:

                # This test does not apply, because this lockable refuses

                # tokens.

                return

            # Relock with a token.

            token_from_reentry = self.lockable.lock_write(token=token)

            try:

                self.assertEqual(token, token_from_reentry)

            finally:

                self.lockable.unlock()

        finally:

            self.lockable.unlock()

        # The lock should be unlocked on disk.  Verify that with a new lock

        # instance.

        new_lockable = self.get_lockable()

        # Calling lock_write now should work, rather than raise LockContention.

        new_lockable.lock_write()

        new_lockable.unlock()

    def test_second_lock_write_returns_same_token(self):

        first_token = self.lockable.lock_write()

        try:

            if first_token is None:

                # This test does not apply, because this lockable refuses

                # tokens.

                return

            # Relock the already locked lockable.  It should return the same

            # token.

            second_token = self.lockable.lock_write()

            try:

                self.assertEqual(first_token, second_token)

            finally:

                self.lockable.unlock()

        finally:

            self.lockable.unlock()

    def test_leave_in_place(self):

        token = self.lockable.lock_write()

        try:

            if token is None:

                # This test does not apply, because this lockable refuses

                # tokens.

                return

            self.lockable.leave_in_place()

        finally:

            self.lockable.unlock()

        # At this point, the lock is still in place on disk

        self.assertRaises(errors.LockContention, self.lockable.lock_write)

        # But should be relockable with a token.

        self.lockable.lock_write(token=token)

        self.lockable.unlock()

        # Cleanup: we should still be able to get the lock, but we restore the

        # behavior to clearing the lock when unlocking.

        self.lockable.lock_write(token=token)

        self.lockable.dont_leave_in_place()

        self.lockable.unlock()

    def test_dont_leave_in_place(self):

        token = self.lockable.lock_write()

        try:

            if token is None:

                # This test does not apply, because this lockable refuses

                # tokens.

                return

            self.lockable.leave_in_place()

        finally:

            self.lockable.unlock()

        # At this point, the lock is still in place on disk.

        # Acquire the existing lock with the token, and ask that it is removed

        # when this object unlocks, and unlock to trigger that removal.

        new_lockable = self.get_lockable()

        new_lockable.lock_write(token=token)

        new_lockable.dont_leave_in_place()

        new_lockable.unlock()

        # At this point, the lock is no longer on disk, so we can lock it.

        third_lockable = self.get_lockable()

        third_lockable.lock_write()

        third_lockable.unlock()

# This method of adapting tests to parameters is different to

# the TestProviderAdapters used elsewhere, but seems simpler for this

# case.

class TestLockableFiles_TransportLock(TestCaseInTempDir,

                                      _TestLockableFiles_mixin):

    def setUp(self):

        TestCaseInTempDir.setUp(self)

        t = transport.get_transport('.')

        t.mkdir('.bzr')

        self.sub_transport = t.clone('.bzr')

        self.lockable = self.get_lockable()

        self.lockable.create_lock()

    def stop_server(self):

        super(TestLockableFiles_TransportLock, self).stop_server()

        # free the subtransport so that we do not get a 5 second

        # timeout due to the SFTP connection cache.

        try:

            del self.sub_transport

        except AttributeError:

            pass

    def get_lockable(self):

        return LockableFiles(self.sub_transport, 'my-lock', TransportLock)

class TestLockableFiles_LockDir(TestCaseInTempDir,

                              _TestLockableFiles_mixin):

    """LockableFile tests run with LockDir underneath"""

    def setUp(self):

        TestCaseInTempDir.setUp(self)

        self.transport = transport.get_transport('.')

        self.lockable = self.get_lockable()

        # the lock creation here sets mode - test_permissions on branch

        # tests that implicitly, but it might be a good idea to factor

        # out the mode checking logic and have it applied to loackable files

        # directly. RBC 20060418

        self.lockable.create_lock()

    def get_lockable(self):

        return LockableFiles(self.transport, 'my-lock', lockdir.LockDir)

    def test_lock_created(self):

        self.assertTrue(self.transport.has('my-lock'))

        self.lockable.lock_write()

        self.assertTrue(self.transport.has('my-lock/held/info'))

        self.lockable.unlock()

        self.assertFalse(self.transport.has('my-lock/held/info'))

        self.assertTrue(self.transport.has('my-lock'))

    def test__file_modes(self):

        self.transport.mkdir('readonly')

        osutils.make_readonly('readonly')

        lockable = LockableFiles(self.transport.clone('readonly'), 'test-lock',

                                 lockdir.LockDir)

        # The directory mode should be read-write-execute for the current user

        self.assertEqual(00700, lockable._dir_mode & 00700)

        # Files should be read-write for the current user

        self.assertEqual(00600, lockable._file_mode & 00700)

class TestLockableFiles_RemoteLockDir(TestCaseWithSmartMedium,

                              _TestLockableFiles_mixin):

    """LockableFile tests run with RemoteLockDir on a branch."""

    def setUp(self):

        TestCaseWithSmartMedium.setUp(self)

        # can only get a RemoteLockDir with some RemoteObject...

        # use a branch as thats what we want. These mixin tests test the end

        # to end behaviour, so stubbing out the backend and simulating would

        # defeat the purpose. We test the protocol implementation separately

        # in test_remote and test_smart as usual.

        b = self.make_branch('foo')

        self.addCleanup(b.bzrdir.transport.disconnect)

        self.transport = transport.get_transport('.')

        self.lockable = self.get_lockable()

    def get_lockable(self):

        # getting a new lockable involves opening a new instance of the branch

        branch = bzrlib.branch.Branch.open(self.get_url('foo'))

        self.addCleanup(branch.bzrdir.transport.disconnect)

        return branch.control_files