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# Copyright (C) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Test locks across all branch implemenations"""
from bzrlib import errors
from bzrlib.branch import BzrBranchFormat4
from bzrlib.bzrdir import RemoteBzrDirFormat
from bzrlib.tests import TestSkipped
from bzrlib.tests.per_branch.test_branch import TestCaseWithBranch
from bzrlib.tests.lock_helpers import TestPreventLocking, LockWrapper
class TestBranchLocking(TestCaseWithBranch):
def setUp(self):
TestCaseWithBranch.setUp(self)
self.reduceLockdirTimeout()
def get_instrumented_branch(self):
"""Get a Branch object which has been instrumented"""
# TODO: jam 20060630 It may be that not all formats have a
# 'control_files' member. So we should fail gracefully if
# not there. But assuming it has them lets us test the exact
# lock/unlock order.
self.locks = []
b = LockWrapper(self.locks, self.get_branch(), 'b')
b.repository = LockWrapper(self.locks, b.repository, 'r')
bcf = b.control_files
rcf = getattr(b.repository, 'control_files', None)
if rcf is None:
self.combined_branch = False
else:
# Look out for branch types that reuse their control files
self.combined_control = bcf is rcf
try:
b.control_files = LockWrapper(self.locks, b.control_files, 'bc')
except AttributeError:
# RemoteBranch seems to trigger this.
raise TestSkipped("Could not instrument branch control files.")
if self.combined_control:
# instrument the repository control files too to ensure its worked
# with correctly. When they are not shared, we trust the repository
# API and only instrument the repository itself.
b.repository.control_files = \
LockWrapper(self.locks, b.repository.control_files, 'rc')
return b
def test_01_lock_read(self):
# Test that locking occurs in the correct order
b = self.get_instrumented_branch()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
b.lock_read()
try:
self.assertTrue(b.is_locked())
self.assertTrue(b.repository.is_locked())
finally:
b.unlock()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
if self.combined_control:
self.assertEqual([('b', 'lr', True),
('r', 'lr', True),
('rc', 'lr', True),
('bc', 'lr', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
else:
self.assertEqual([('b', 'lr', True),
('r', 'lr', True),
('bc', 'lr', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', True),
], self.locks)
def test_02_lock_write(self):
# Test that locking occurs in the correct order
b = self.get_instrumented_branch()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
b.lock_write()
try:
self.assertTrue(b.is_locked())
self.assertTrue(b.repository.is_locked())
finally:
b.unlock()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
if self.combined_control:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('rc', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
else:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', True),
], self.locks)
def test_03_lock_fail_unlock_repo(self):
# Make sure branch.unlock() is called, even if there is a
# failure while unlocking the repository.
b = self.get_instrumented_branch()
b.repository.disable_unlock()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
b.lock_write()
try:
self.assertTrue(b.is_locked())
self.assertTrue(b.repository.is_locked())
self.assertRaises(TestPreventLocking, b.unlock)
if self.combined_control:
self.assertTrue(b.is_locked())
else:
self.assertFalse(b.is_locked())
self.assertTrue(b.repository.is_locked())
# We unlock the branch control files, even if
# we fail to unlock the repository
if self.combined_control:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('rc', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', False),
], self.locks)
else:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', True),
('r', 'ul', False),
], self.locks)
finally:
# For cleanup purposes, make sure we are unlocked
b.repository._other.unlock()
def test_04_lock_fail_unlock_control(self):
# Make sure repository.unlock() is not called, if we fail to unlock
# self leaving ourselves still locked, so that attempts to recover
# don't encounter an unlocked repository.
b = self.get_instrumented_branch()
b.control_files.disable_unlock()
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
b.lock_write()
try:
self.assertTrue(b.is_locked())
self.assertTrue(b.repository.is_locked())
self.assertRaises(TestPreventLocking, b.unlock)
self.assertTrue(b.is_locked())
self.assertTrue(b.repository.is_locked())
# We unlock the repository even if
# we fail to unlock the control files
if self.combined_control:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('rc', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', False),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
else:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('bc', 'lw', True),
('b', 'ul', True),
('bc', 'ul', False),
], self.locks)
finally:
# For cleanup purposes, make sure we are unlocked
b.control_files._other.unlock()
def test_05_lock_read_fail_repo(self):
# Test that the branch is not locked if it cannot lock the repository
b = self.get_instrumented_branch()
b.repository.disable_lock_read()
self.assertRaises(TestPreventLocking, b.lock_read)
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
self.assertEqual([('b', 'lr', True),
('r', 'lr', False),
], self.locks)
def test_06_lock_write_fail_repo(self):
# Test that the branch is not locked if it cannot lock the repository
b = self.get_instrumented_branch()
b.repository.disable_lock_write()
self.assertRaises(TestPreventLocking, b.lock_write)
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
self.assertEqual([('b', 'lw', True),
('r', 'lw', False),
], self.locks)
def test_07_lock_read_fail_control(self):
# Test the repository is unlocked if we can't lock self
b = self.get_instrumented_branch()
b.control_files.disable_lock_read()
self.assertRaises(TestPreventLocking, b.lock_read)
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
if self.combined_control:
self.assertEqual([('b', 'lr', True),
('r', 'lr', True),
('rc', 'lr', True),
('bc', 'lr', False),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
else:
self.assertEqual([('b', 'lr', True),
('r', 'lr', True),
('bc', 'lr', False),
('r', 'ul', True),
], self.locks)
def test_08_lock_write_fail_control(self):
# Test the repository is unlocked if we can't lock self
b = self.get_instrumented_branch()
b.control_files.disable_lock_write()
self.assertRaises(TestPreventLocking, b.lock_write)
self.assertFalse(b.is_locked())
self.assertFalse(b.repository.is_locked())
if self.combined_control:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('rc', 'lw', True),
('bc', 'lw', False),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
else:
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('bc', 'lw', False),
('r', 'ul', True),
], self.locks)
def test_lock_write_returns_None_refuses_token(self):
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is not None:
# This test does not apply, because this lockable supports
# tokens.
return
self.assertRaises(errors.TokenLockingNotSupported,
branch.lock_write, token='token')
finally:
branch.unlock()
def test_reentering_lock_write_raises_on_token_mismatch(self):
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this lockable refuses
# tokens.
return
different_branch_token = token + 'xxx'
# Re-using the same lockable instance with a different branch token
# will raise TokenMismatch.
self.assertRaises(errors.TokenMismatch,
branch.lock_write,
token=different_branch_token)
finally:
branch.unlock()
def test_lock_write_with_nonmatching_token(self):
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this branch refuses
# tokens.
return
different_branch_token = token + 'xxx'
new_branch = branch.bzrdir.open_branch()
# We only want to test the relocking abilities of branch, so use the
# existing repository object which is already locked.
new_branch.repository = branch.repository
self.assertRaises(errors.TokenMismatch,
new_branch.lock_write,
token=different_branch_token)
finally:
branch.unlock()
def test_lock_write_with_matching_token(self):
"""Test that a branch can be locked with a token, if it is already
locked by that token."""
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this branch refuses tokens.
return
# The same instance will accept a second lock_write if the specified
# token matches.
branch.lock_write(token=token)
branch.unlock()
# Calling lock_write on a new instance for the same lockable will
# also succeed.
new_branch = branch.bzrdir.open_branch()
# We only want to test the relocking abilities of branch, so use the
# existing repository object which is already locked.
new_branch.repository = branch.repository
new_branch.lock_write(token=token)
new_branch.unlock()
finally:
branch.unlock()
def test_unlock_after_lock_write_with_token(self):
# If lock_write did not physically acquire the lock (because it was
# passed some tokens), then unlock should not physically release it.
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this lockable refuses
# tokens.
return
new_branch = branch.bzrdir.open_branch()
# We only want to test the relocking abilities of branch, so use the
# existing repository object which is already locked.
new_branch.repository = branch.repository
new_branch.lock_write(token=token)
new_branch.unlock()
self.assertTrue(branch.get_physical_lock_status()) #XXX
finally:
branch.unlock()
def test_lock_write_with_token_fails_when_unlocked(self):
# First, lock and then unlock to get superficially valid tokens. 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).
branch = self.make_branch('b')
token = branch.lock_write()
branch.unlock()
if token is None:
# This test does not apply, because this lockable refuses
# tokens.
return
self.assertRaises(errors.TokenMismatch,
branch.lock_write, token=token)
def test_lock_write_reenter_with_token(self):
branch = self.make_branch('b')
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this lockable refuses
# tokens.
return
# Relock with a token.
branch.lock_write(token=token)
branch.unlock()
finally:
branch.unlock()
# The lock should be unlocked on disk. Verify that with a new lock
# instance.
new_branch = branch.bzrdir.open_branch()
# Calling lock_write now should work, rather than raise LockContention.
new_branch.lock_write()
new_branch.unlock()
def test_leave_lock_in_place(self):
branch = self.make_branch('b')
# Lock the branch, then use leave_lock_in_place so that when we
# unlock the branch the lock is still held on disk.
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this repository refuses lock
# tokens.
self.assertRaises(NotImplementedError,
branch.leave_lock_in_place)
return
branch.leave_lock_in_place()
finally:
branch.unlock()
# We should be unable to relock the repo.
self.assertRaises(errors.LockContention, branch.lock_write)
# Cleanup
branch.lock_write(token)
branch.dont_leave_lock_in_place()
branch.unlock()
def test_dont_leave_lock_in_place(self):
branch = self.make_branch('b')
# Create a lock on disk.
token = branch.lock_write()
try:
if token is None:
# This test does not apply, because this branch refuses lock
# tokens.
self.assertRaises(NotImplementedError,
branch.dont_leave_lock_in_place)
return
try:
branch.leave_lock_in_place()
except NotImplementedError:
# This branch doesn't support this API.
return
try:
branch.repository.leave_lock_in_place()
except NotImplementedError:
# This repo doesn't support leaving locks around,
# assume it is essentially lock-free.
repo_token = None
else:
repo_token = branch.repository.lock_write()
branch.repository.unlock()
finally:
branch.unlock()
# Reacquire the lock (with a different branch object) by using the
# tokens.
new_branch = branch.bzrdir.open_branch()
if repo_token is not None:
# We have to explicitly lock the repository first.
new_branch.repository.lock_write(token=repo_token)
new_branch.lock_write(token=token)
if repo_token is not None:
# Now we don't need our own repository lock anymore (the branch is
# holding it for us).
new_branch.repository.unlock()
# Call dont_leave_lock_in_place, so that the lock will be released by
# this instance, even though the lock wasn't originally acquired by it.
new_branch.dont_leave_lock_in_place()
if repo_token is not None:
new_branch.repository.dont_leave_lock_in_place()
new_branch.unlock()
# Now the branch (and repository) is unlocked. Test this by locking it
# without tokens.
branch.lock_write()
branch.unlock()
def test_lock_read_then_unlock(self):
# Calling lock_read then unlocking should work without errors.
branch = self.make_branch('b')
branch.lock_read()
branch.unlock()
def test_lock_write_locks_repo_too(self):
if isinstance(self.branch_format, BzrBranchFormat4):
# Branch format 4 is combined with the repository, so this test
# doesn't apply.
return
branch = self.make_branch('b')
branch = branch.bzrdir.open_branch()
branch.lock_write()
try:
# The branch should have asked the repository to lock.
self.assertTrue(branch.repository.is_write_locked())
# Does the repository type actually lock?
if not branch.repository.get_physical_lock_status():
# The test was successfully applied, so it was applicable.
return
# Now the branch.repository is physically locked, so we can't lock
# it with a new repository instance.
new_repo = branch.bzrdir.open_repository()
self.assertRaises(errors.LockContention, new_repo.lock_write)
# We can call lock_write on the original repository object though,
# because it is already locked.
branch.repository.lock_write()
branch.repository.unlock()
finally:
branch.unlock()
def test_lock_and_unlock_leaves_repo_unlocked(self):
branch = self.make_branch('b')
branch.lock_write()
branch.unlock()
self.assertRaises(errors.LockNotHeld, branch.repository.unlock)
|