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# Copyright (C) 2006 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Tests for LockDir"""
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from cStringIO import StringIO
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from threading import Thread
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from bzrlib.errors import (
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LockContention, LockError, UnlockableTransport,
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LockNotHeld, LockBroken
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from bzrlib.lockdir import LockDir
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from bzrlib.tests import TestCaseWithTransport
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# These tests sometimes use threads to test the behaviour of lock files with
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# concurrent actors. This is not a typical (or necessarily supported) use;
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# they're really meant for guarding between processes.
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# These tests are run on the default transport provided by the test framework
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# (typically a local disk transport). That can be changed by the --transport
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# option to bzr selftest. The required properties of the transport
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# implementation are tested separately. (The main requirement is just that
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# they don't allow overwriting nonempty directories.)
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class TestLockDir(TestCaseWithTransport):
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"""Test LockDir operations"""
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def test_00_lock_creation(self):
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"""Creation of lock file on a transport"""
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t = self.get_transport()
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lf = LockDir(t, 'test_lock')
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self.assertFalse(lf.is_held)
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def test_01_lock_repr(self):
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"""Lock string representation"""
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lf = LockDir(self.get_transport(), 'test_lock')
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self.assertContainsRe(r, r'^LockDir\(.*/test_lock\)$')
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def test_02_unlocked_peek(self):
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lf = LockDir(self.get_transport(), 'test_lock')
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self.assertEqual(lf.peek(), None)
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return LockDir(self.get_transport(), 'test_lock')
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def test_unlock_after_break_raises(self):
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ld2.force_break(ld2.peek())
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self.assertRaises(LockBroken, ld.unlock)
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def test_03_readonly_peek(self):
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lf = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertEqual(lf.peek(), None)
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def test_10_lock_uncontested(self):
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"""Acquire and release a lock"""
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t = self.get_transport()
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lf = LockDir(t, 'test_lock')
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self.assertTrue(lf.is_held)
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self.assertFalse(lf.is_held)
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def test_11_create_readonly_transport(self):
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"""Fail to create lock on readonly transport"""
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t = self.get_readonly_transport()
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lf = LockDir(t, 'test_lock')
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self.assertRaises(UnlockableTransport, lf.create)
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def test_12_lock_readonly_transport(self):
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"""Fail to lock on readonly transport"""
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lf = LockDir(self.get_transport(), 'test_lock')
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lf = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertRaises(UnlockableTransport, lf.attempt_lock)
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def test_20_lock_contested(self):
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"""Contention to get a lock"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(t, 'test_lock')
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# locking is between LockDir instances; aliases within
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# a single process are not detected
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self.fail('Failed to detect lock collision')
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except LockContention, e:
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self.assertEqual(e.lock, lf2)
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self.assertContainsRe(str(e),
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r'^Could not acquire.*test_lock.*$')
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def test_20_lock_peek(self):
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"""Peek at the state of a lock"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# lock is held, should get some info on it
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self.assertEqual(set(info1.keys()),
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set(['user', 'nonce', 'hostname', 'pid', 'start_time']))
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# should get the same info if we look at it through a different
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info2 = LockDir(t, 'test_lock').peek()
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self.assertEqual(info1, info2)
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# locks which are never used should be not-held
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self.assertEqual(LockDir(t, 'other_lock').peek(), None)
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def test_21_peek_readonly(self):
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"""Peek over a readonly transport"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertEqual(lf2.peek(), None)
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self.assertTrue(info2)
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self.assertEqual(info2['nonce'], lf1.nonce)
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def test_30_lock_wait_fail(self):
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"""Wait on a lock, then fail
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We ask to wait up to 400ms; this should fail within at most one
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second. (Longer times are more realistic but we don't want the test
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suite to take too long, and this should do for now.)
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(t, 'test_lock')
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self.assertRaises(LockContention, lf2.wait_lock,
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timeout=0.4, poll=0.1)
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# it should only take about 0.4 seconds, but we allow more time in
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# case the machine is heavily loaded
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self.assertTrue(after - before <= 8.0,
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"took %f seconds to detect lock contention" % (after - before))
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def test_31_lock_wait_easy(self):
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"""Succeed when waiting on a lock with no contention.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf1.wait_lock(timeout=0.4, poll=0.1)
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self.assertTrue(after - before <= 1.0)
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def test_32_lock_wait_succeed(self):
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"""Succeed when trying to acquire a lock that gets released
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One thread holds on a lock and then releases it; another
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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def wait_and_unlock():
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unlocker = Thread(target=wait_and_unlock)
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lf2 = LockDir(t, 'test_lock')
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lf2.wait_lock(timeout=0.4, poll=0.1)
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self.assertTrue(after - before <= 1.0)
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def test_33_wait(self):
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"""Succeed when waiting on a lock that gets released
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The difference from test_32_lock_wait_succeed is that the second
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caller does not actually acquire the lock, but just waits for it
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to be released. This is done over a readonly transport.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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def wait_and_unlock():
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unlocker = Thread(target=wait_and_unlock)
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lf2 = LockDir(self.get_readonly_transport(), 'test_lock')
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# wait but don't lock
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lf2.wait(timeout=0.4, poll=0.1)
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self.assertTrue(after - before <= 1.0)
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def test_40_confirm_easy(self):
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"""Confirm a lock that's already held"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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def test_41_confirm_not_held(self):
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"""Confirm a lock that's already held"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.assertRaises(LockNotHeld, lf1.confirm)
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def test_42_confirm_broken_manually(self):
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"""Confirm a lock broken by hand"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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t.move('test_lock', 'lock_gone_now')
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self.assertRaises(LockBroken, lf1.confirm)
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def test_43_break(self):
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"""Break a lock whose caller has forgotten it"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# we incorrectly discard the lock object without unlocking it
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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self.assertTrue(holder_info)
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lf2.force_break(holder_info)
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# now we should be able to take it
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def test_44_break_already_released(self):
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"""Lock break races with regular release"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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# in the interim the lock is released
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# break should succeed
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lf2.force_break(holder_info)
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# now we should be able to take it
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def test_45_break_mismatch(self):
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"""Lock break races with someone else acquiring it"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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# in the interim the lock is released
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lf3 = LockDir(t, 'test_lock')
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# break should now *fail*
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self.assertRaises(LockBreakMismatch, lf2.force_break,
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def test_46_fake_read_lock(self):
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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def test_50_lockdir_representation(self):
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"""Check the on-disk representation of LockDirs is as expected.
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There should always be a top-level directory named by the lock.
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When the lock is held, there should be a lockname/held directory
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containing an info file.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.assertTrue(t.has('test_lock'))
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self.assertTrue(t.has('test_lock/held/info'))
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self.assertFalse(t.has('test_lock/held/info'))
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def test_break_lock(self):
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# the ui based break_lock routine should Just Work (tm)
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ld1 = self.get_lock()
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ld2 = self.get_lock()
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# do this without IO redirection to ensure it doesn't prompt.
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self.assertRaises(AssertionError, ld1.break_lock)
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orig_factory = bzrlib.ui.ui_factory
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# silent ui - no need for stdout
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bzrlib.ui.ui_factory = bzrlib.ui.SilentUIFactory()
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bzrlib.ui.ui_factory.stdin = StringIO("y\n")
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self.assertRaises(LockBroken, ld1.unlock)
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bzrlib.ui.ui_factory = orig_factory
added
removed
bzrlib/tests/test_lockdir.py
