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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Test locks across all branch implemenations"""
from bzrlib.tests.branch_implementations.test_branch import TestCaseWithBranch
from bzrlib.tests.lock_helpers import TestPreventLocking, LockWrapper
class TestBranchLocking(TestCaseWithBranch):
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 = b.repository.control_files
# Look out for branch types that reuse their control files
self.combined_control = bcf is rcf
b.control_files = LockWrapper(self.locks, b.control_files, 'bc')
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())
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)
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())
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)
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
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)
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 called, if we fail to unlock self
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())
if self.combined_control:
self.assertTrue(b.repository.is_locked())
else:
self.assertFalse(b.repository.is_locked())
# We unlock the repository even if
# we fail to unlock the control files
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)
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())
self.assertEqual([('b', 'lr', True),
('r', 'lr', True),
('rc', 'lr', True),
('bc', 'lr', False),
('r', 'ul', True),
('rc', '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())
self.assertEqual([('b', 'lw', True),
('r', 'lw', True),
('rc', 'lw', True),
('bc', 'lw', False),
('r', 'ul', True),
('rc', 'ul', True),
], self.locks)
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