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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.lock_helpers import TestPreventLocking, LockWrapper
from bzrlib.tests.workingtree_implementations import TestCaseWithWorkingTree
class TestWorkingTreeLocking(TestCaseWithWorkingTree):
def get_instrumented_tree(self):
"""Get a WorkingTree 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 = []
wt = self.make_branch_and_tree('.')
wt = LockWrapper(self.locks, wt, 't')
wt._branch = LockWrapper(self.locks, wt._branch, 'b')
tcf = wt._control_files
bcf = wt.branch.control_files
# Look out for AllInOne
self.combined_control = tcf is bcf
wt._control_files = LockWrapper(self.locks, wt._control_files, 'tc')
wt.branch.control_files = \
LockWrapper(self.locks, wt.branch.control_files, 'bc')
return wt
def test_01_lock_read(self):
# Test that locking occurs in the correct order
wt = self.get_instrumented_tree()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
wt.lock_read()
try:
self.assertTrue(wt.is_locked())
self.assertTrue(wt.branch.is_locked())
finally:
wt.unlock()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lr', True),
('b', 'lr', True),
('bc', 'lr', True),
('tc', 'lr', True),
('t', 'ul', True),
('tc', 'ul', True),
('b', 'ul', True),
('bc', 'ul', True),
], self.locks)
def test_02_lock_write(self):
# Test that locking occurs in the correct order
wt = self.get_instrumented_tree()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
wt.lock_write()
try:
self.assertTrue(wt.is_locked())
self.assertTrue(wt.branch.is_locked())
finally:
wt.unlock()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lw', True),
('b', 'lw', True),
('bc', 'lw', True),
('tc', 'lw', True),
('t', 'ul', True),
('tc', 'ul', True),
('b', 'ul', True),
('bc', 'ul', True),
], self.locks)
def test_03_lock_fail_unlock_branch(self):
# Make sure tree.unlock() is called, even if there is a
# failure while unlocking the branch.
wt = self.get_instrumented_tree()
wt.branch.disable_unlock()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
wt.lock_write()
try:
self.assertTrue(wt.is_locked())
self.assertTrue(wt.branch.is_locked())
self.assertRaises(TestPreventLocking, wt.unlock)
if self.combined_control:
self.assertTrue(wt.is_locked())
else:
self.assertFalse(wt.is_locked())
self.assertTrue(wt.branch.is_locked())
self.assertEqual([('t', 'lw', True),
('b', 'lw', True),
('bc', 'lw', True),
('tc', 'lw', True),
('t', 'ul', True),
('tc', 'ul', True),
('b', 'ul', False),
], self.locks)
finally:
# For cleanup purposes, make sure we are unlocked
wt.branch._other.unlock()
def test_04_lock_fail_unlock_control(self):
# Make sure that branch is unlocked, even if we fail to unlock self
wt = self.get_instrumented_tree()
wt._control_files.disable_unlock()
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
wt.lock_write()
try:
self.assertTrue(wt.is_locked())
self.assertTrue(wt.branch.is_locked())
self.assertRaises(TestPreventLocking, wt.unlock)
self.assertTrue(wt.is_locked())
if self.combined_control:
self.assertTrue(wt.branch.is_locked())
else:
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lw', True),
('b', 'lw', True),
('bc', 'lw', True),
('tc', 'lw', True),
('t', 'ul', True),
('tc', 'ul', False),
('b', 'ul', True),
('bc', 'ul', True),
], self.locks)
finally:
# For cleanup purposes, make sure we are unlocked
wt._control_files._other.unlock()
def test_05_lock_read_fail_branch(self):
# Test that the tree is not locked if it cannot lock the branch
wt = self.get_instrumented_tree()
wt.branch.disable_lock_read()
self.assertRaises(TestPreventLocking, wt.lock_read)
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lr', True),
('b', 'lr', False),
], self.locks)
def test_06_lock_write_fail_branch(self):
# Test that the tree is not locked if it cannot lock the branch
wt = self.get_instrumented_tree()
wt.branch.disable_lock_write()
self.assertRaises(TestPreventLocking, wt.lock_write)
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lw', True),
('b', 'lw', False),
], self.locks)
def test_07_lock_read_fail_control(self):
# We should unlock the branch if we can't lock the tree
wt = self.get_instrumented_tree()
wt._control_files.disable_lock_read()
self.assertRaises(TestPreventLocking, wt.lock_read)
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lr', True),
('b', 'lr', True),
('bc', 'lr', True),
('tc', 'lr', False),
('b', 'ul', True),
('bc', 'ul', True)
], self.locks)
def test_08_lock_write_fail_control(self):
# We shouldn't try to lock the repo if we can't lock the branch
wt = self.get_instrumented_tree()
wt._control_files.disable_lock_write()
self.assertRaises(TestPreventLocking, wt.lock_write)
self.assertFalse(wt.is_locked())
self.assertFalse(wt.branch.is_locked())
self.assertEqual([('t', 'lw', True),
('b', 'lw', True),
('bc', 'lw', True),
('tc', 'lw', False),
('b', 'ul', True),
('bc', 'ul', True)
], self.locks)
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