1
# Copyright (C) 2006-2011 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
"""Tests for LockDir"""
33
from bzrlib.errors import (
40
from bzrlib.lockdir import (
44
from bzrlib.tests import (
47
TestCaseWithTransport,
49
from bzrlib.trace import note
51
# These tests are run on the default transport provided by the test framework
52
# (typically a local disk transport). That can be changed by the --transport
53
# option to bzr selftest. The required properties of the transport
54
# implementation are tested separately. (The main requirement is just that
55
# they don't allow overwriting nonempty directories.)
58
class TestLockDir(TestCaseWithTransport):
59
"""Test LockDir operations"""
61
def logging_report_function(self, fmt, *args):
62
self._logged_reports.append((fmt, args))
64
def setup_log_reporter(self, lock_dir):
65
self._logged_reports = []
66
lock_dir._report_function = self.logging_report_function
68
def test_00_lock_creation(self):
69
"""Creation of lock file on a transport"""
70
t = self.get_transport()
71
lf = LockDir(t, 'test_lock')
72
self.assertFalse(lf.is_held)
74
def test_01_lock_repr(self):
75
"""Lock string representation"""
76
lf = LockDir(self.get_transport(), 'test_lock')
78
self.assertContainsRe(r, r'^LockDir\(.*/test_lock\)$')
80
def test_02_unlocked_peek(self):
81
lf = LockDir(self.get_transport(), 'test_lock')
82
self.assertEqual(lf.peek(), None)
85
return LockDir(self.get_transport(), 'test_lock')
87
def test_unlock_after_break_raises(self):
92
ld2.force_break(ld2.peek())
93
self.assertRaises(LockBroken, ld.unlock)
95
def test_03_readonly_peek(self):
96
lf = LockDir(self.get_readonly_transport(), 'test_lock')
97
self.assertEqual(lf.peek(), None)
99
def test_10_lock_uncontested(self):
100
"""Acquire and release a lock"""
101
t = self.get_transport()
102
lf = LockDir(t, 'test_lock')
106
self.assertTrue(lf.is_held)
109
self.assertFalse(lf.is_held)
111
def test_11_create_readonly_transport(self):
112
"""Fail to create lock on readonly transport"""
113
t = self.get_readonly_transport()
114
lf = LockDir(t, 'test_lock')
115
self.assertRaises(LockFailed, lf.create)
117
def test_12_lock_readonly_transport(self):
118
"""Fail to lock on readonly transport"""
119
lf = LockDir(self.get_transport(), 'test_lock')
121
lf = LockDir(self.get_readonly_transport(), 'test_lock')
122
self.assertRaises(LockFailed, lf.attempt_lock)
124
def test_20_lock_contested(self):
125
"""Contention to get a lock"""
126
t = self.get_transport()
127
lf1 = LockDir(t, 'test_lock')
130
lf2 = LockDir(t, 'test_lock')
132
# locking is between LockDir instances; aliases within
133
# a single process are not detected
135
self.fail('Failed to detect lock collision')
136
except LockContention, e:
137
self.assertEqual(e.lock, lf2)
138
self.assertContainsRe(str(e),
139
r'^Could not acquire.*test_lock.*$')
142
def test_20_lock_peek(self):
143
"""Peek at the state of a lock"""
144
t = self.get_transport()
145
lf1 = LockDir(t, 'test_lock')
148
self.addCleanup(lf1.unlock)
149
# lock is held, should get some info on it
151
self.assertEqual(set(info1.info_dict.keys()),
152
set(['user', 'nonce', 'hostname', 'pid', 'start_time']))
153
# should get the same info if we look at it through a different
155
info2 = LockDir(t, 'test_lock').peek()
156
self.assertEqual(info1, info2)
157
# locks which are never used should be not-held
158
self.assertEqual(LockDir(t, 'other_lock').peek(), None)
160
def test_21_peek_readonly(self):
161
"""Peek over a readonly transport"""
162
t = self.get_transport()
163
lf1 = LockDir(t, 'test_lock')
165
lf2 = LockDir(self.get_readonly_transport(), 'test_lock')
166
self.assertEqual(lf2.peek(), None)
168
self.addCleanup(lf1.unlock)
170
self.assertTrue(info2)
171
self.assertEqual(info2.get('nonce'), lf1.nonce)
173
def test_30_lock_wait_fail(self):
174
"""Wait on a lock, then fail
176
We ask to wait up to 400ms; this should fail within at most one
177
second. (Longer times are more realistic but we don't want the test
178
suite to take too long, and this should do for now.)
180
t = self.get_transport()
181
lf1 = LockDir(t, 'test_lock')
183
lf2 = LockDir(t, 'test_lock')
184
self.setup_log_reporter(lf2)
188
self.assertRaises(LockContention, lf2.wait_lock,
189
timeout=0.4, poll=0.1)
191
# it should only take about 0.4 seconds, but we allow more time in
192
# case the machine is heavily loaded
193
self.assertTrue(after - before <= 8.0,
194
"took %f seconds to detect lock contention" % (after - before))
197
self.assertEqual(1, len(self._logged_reports))
198
self.assertContainsRe(self._logged_reports[0][0],
199
r'Unable to obtain lock .* held by jrandom@example\.com on .*'
200
r' \(process #\d+\), acquired .* ago\.\n'
201
r'Will continue to try until \d{2}:\d{2}:\d{2}, unless '
202
r'you press Ctrl-C.\n'
203
r'See "bzr help break-lock" for more.')
205
def test_31_lock_wait_easy(self):
206
"""Succeed when waiting on a lock with no contention.
208
t = self.get_transport()
209
lf1 = LockDir(t, 'test_lock')
211
self.setup_log_reporter(lf1)
214
lf1.wait_lock(timeout=0.4, poll=0.1)
216
self.assertTrue(after - before <= 1.0)
219
self.assertEqual([], self._logged_reports)
221
def test_40_confirm_easy(self):
222
"""Confirm a lock that's already held"""
223
t = self.get_transport()
224
lf1 = LockDir(t, 'test_lock')
227
self.addCleanup(lf1.unlock)
230
def test_41_confirm_not_held(self):
231
"""Confirm a lock that's already held"""
232
t = self.get_transport()
233
lf1 = LockDir(t, 'test_lock')
235
self.assertRaises(LockNotHeld, lf1.confirm)
237
def test_42_confirm_broken_manually(self):
238
"""Confirm a lock broken by hand"""
239
t = self.get_transport()
240
lf1 = LockDir(t, 'test_lock')
243
t.move('test_lock', 'lock_gone_now')
244
self.assertRaises(LockBroken, lf1.confirm)
246
t.move('lock_gone_now', 'test_lock')
249
def test_43_break(self):
250
"""Break a lock whose caller has forgotten it"""
251
t = self.get_transport()
252
lf1 = LockDir(t, 'test_lock')
255
# we incorrectly discard the lock object without unlocking it
257
# someone else sees it's still locked
258
lf2 = LockDir(t, 'test_lock')
259
holder_info = lf2.peek()
260
self.assertTrue(holder_info)
261
lf2.force_break(holder_info)
262
# now we should be able to take it
264
self.addCleanup(lf2.unlock)
267
def test_44_break_already_released(self):
268
"""Lock break races with regular release"""
269
t = self.get_transport()
270
lf1 = LockDir(t, 'test_lock')
273
# someone else sees it's still locked
274
lf2 = LockDir(t, 'test_lock')
275
holder_info = lf2.peek()
276
# in the interim the lock is released
278
# break should succeed
279
lf2.force_break(holder_info)
280
# now we should be able to take it
282
self.addCleanup(lf2.unlock)
285
def test_45_break_mismatch(self):
286
"""Lock break races with someone else acquiring it"""
287
t = self.get_transport()
288
lf1 = LockDir(t, 'test_lock')
291
# someone else sees it's still locked
292
lf2 = LockDir(t, 'test_lock')
293
holder_info = lf2.peek()
294
# in the interim the lock is released
296
lf3 = LockDir(t, 'test_lock')
298
# break should now *fail*
299
self.assertRaises(LockBreakMismatch, lf2.force_break,
303
def test_46_fake_read_lock(self):
304
t = self.get_transport()
305
lf1 = LockDir(t, 'test_lock')
310
def test_50_lockdir_representation(self):
311
"""Check the on-disk representation of LockDirs is as expected.
313
There should always be a top-level directory named by the lock.
314
When the lock is held, there should be a lockname/held directory
315
containing an info file.
317
t = self.get_transport()
318
lf1 = LockDir(t, 'test_lock')
320
self.assertTrue(t.has('test_lock'))
322
self.assertTrue(t.has('test_lock/held/info'))
324
self.assertFalse(t.has('test_lock/held/info'))
326
def test_break_lock(self):
327
# the ui based break_lock routine should Just Work (tm)
328
ld1 = self.get_lock()
329
ld2 = self.get_lock()
332
# do this without IO redirection to ensure it doesn't prompt.
333
self.assertRaises(AssertionError, ld1.break_lock)
334
orig_factory = bzrlib.ui.ui_factory
335
bzrlib.ui.ui_factory = bzrlib.ui.CannedInputUIFactory([True])
338
self.assertRaises(LockBroken, ld1.unlock)
340
bzrlib.ui.ui_factory = orig_factory
342
def test_break_lock_corrupt_info(self):
343
"""break_lock works even if the info file is corrupt (and tells the UI
347
ld2 = self.get_lock()
350
ld.transport.put_bytes_non_atomic('test_lock/held/info', '\0')
352
class LoggingUIFactory(bzrlib.ui.SilentUIFactory):
356
def get_boolean(self, prompt):
357
self.prompts.append(('boolean', prompt))
360
ui = LoggingUIFactory()
361
self.overrideAttr(bzrlib.ui, 'ui_factory', ui)
363
self.assertLength(1, ui.prompts)
364
self.assertEqual('boolean', ui.prompts[0][0])
365
self.assertStartsWith(ui.prompts[0][1], 'Break (corrupt LockDir')
366
self.assertRaises(LockBroken, ld.unlock)
368
def test_break_lock_missing_info(self):
369
"""break_lock works even if the info file is missing (and tells the UI
373
ld2 = self.get_lock()
376
ld.transport.delete('test_lock/held/info')
378
class LoggingUIFactory(bzrlib.ui.SilentUIFactory):
382
def get_boolean(self, prompt):
383
self.prompts.append(('boolean', prompt))
386
ui = LoggingUIFactory()
387
orig_factory = bzrlib.ui.ui_factory
388
bzrlib.ui.ui_factory = ui
391
self.assertRaises(LockBroken, ld.unlock)
392
self.assertLength(0, ui.prompts)
394
bzrlib.ui.ui_factory = orig_factory
395
# Suppress warnings due to ld not being unlocked
396
# XXX: if lock_broken hook was invoked in this case, this hack would
397
# not be necessary. - Andrew Bennetts, 2010-09-06.
398
del self._lock_actions[:]
400
def test_create_missing_base_directory(self):
401
"""If LockDir.path doesn't exist, it can be created
403
Some people manually remove the entire lock/ directory trying
404
to unlock a stuck repository/branch/etc. Rather than failing
405
after that, just create the lock directory when needed.
407
t = self.get_transport()
408
lf1 = LockDir(t, 'test_lock')
411
self.assertTrue(t.has('test_lock'))
414
self.assertFalse(t.has('test_lock'))
416
# This will create 'test_lock' if it needs to
418
self.assertTrue(t.has('test_lock'))
419
self.assertTrue(t.has('test_lock/held/info'))
422
self.assertFalse(t.has('test_lock/held/info'))
424
def test_display_form(self):
425
ld1 = self.get_lock()
429
info_list = ld1.peek().to_readable_dict()
432
self.assertEqual(info_list['user'], u'jrandom@example.com')
433
self.assertContainsRe(info_list['pid'], '^\d+$')
434
self.assertContainsRe(info_list['time_ago'], r'^\d+ seconds? ago$')
436
def test_lock_without_email(self):
437
global_config = config.GlobalConfig()
438
# Intentionally has no email address
439
global_config.set_user_option('email', 'User Identity')
440
ld1 = self.get_lock()
445
def test_lock_permission(self):
446
self.requireFeature(features.not_running_as_root)
447
if not osutils.supports_posix_readonly():
448
raise tests.TestSkipped('Cannot induce a permission failure')
449
ld1 = self.get_lock()
450
lock_path = ld1.transport.local_abspath('test_lock')
452
osutils.make_readonly(lock_path)
453
self.assertRaises(errors.LockFailed, ld1.attempt_lock)
455
def test_lock_by_token(self):
456
ld1 = self.get_lock()
457
token = ld1.lock_write()
458
self.addCleanup(ld1.unlock)
459
self.assertNotEqual(None, token)
460
ld2 = self.get_lock()
461
t2 = ld2.lock_write(token)
462
self.addCleanup(ld2.unlock)
463
self.assertEqual(token, t2)
465
def test_lock_with_buggy_rename(self):
466
# test that lock acquisition handles servers which pretend they
467
# renamed correctly but that actually fail
468
t = transport.get_transport('brokenrename+' + self.get_url())
469
ld1 = LockDir(t, 'test_lock')
472
ld2 = LockDir(t, 'test_lock')
473
# we should fail to lock
474
e = self.assertRaises(errors.LockContention, ld2.attempt_lock)
475
# now the original caller should succeed in unlocking
477
# and there should be nothing left over
478
self.assertEquals([], t.list_dir('test_lock'))
480
def test_failed_lock_leaves_no_trash(self):
481
# if we fail to acquire the lock, we don't leave pending directories
482
# behind -- https://bugs.launchpad.net/bzr/+bug/109169
483
ld1 = self.get_lock()
484
ld2 = self.get_lock()
485
# should be nothing before we start
487
t = self.get_transport().clone('test_lock')
490
self.assertEquals(a, t.list_dir('.'))
493
# when held, that's all we see
495
self.addCleanup(ld1.unlock)
497
# second guy should fail
498
self.assertRaises(errors.LockContention, ld2.attempt_lock)
502
def test_no_lockdir_info(self):
503
"""We can cope with empty info files."""
504
# This seems like a fairly common failure case - see
505
# <https://bugs.launchpad.net/bzr/+bug/185103> and all its dupes.
506
# Processes are often interrupted after opening the file
507
# before the actual contents are committed.
508
t = self.get_transport()
510
t.mkdir('test_lock/held')
511
t.put_bytes('test_lock/held/info', '')
512
lf = LockDir(t, 'test_lock')
514
formatted_info = info.to_readable_dict()
516
dict(user='<unknown>', hostname='<unknown>', pid='<unknown>',
517
time_ago='(unknown)'),
520
def test_corrupt_lockdir_info(self):
521
"""We can cope with corrupt (and thus unparseable) info files."""
522
# This seems like a fairly common failure case too - see
523
# <https://bugs.launchpad.net/bzr/+bug/619872> for instance.
524
# In particular some systems tend to fill recently created files with
525
# nul bytes after recovering from a system crash.
526
t = self.get_transport()
528
t.mkdir('test_lock/held')
529
t.put_bytes('test_lock/held/info', '\0')
530
lf = LockDir(t, 'test_lock')
531
self.assertRaises(errors.LockCorrupt, lf.peek)
532
# Currently attempt_lock gives LockContention, but LockCorrupt would be
533
# a reasonable result too.
535
(errors.LockCorrupt, errors.LockContention), lf.attempt_lock)
536
self.assertRaises(errors.LockCorrupt, lf.validate_token, 'fake token')
538
def test_missing_lockdir_info(self):
539
"""We can cope with absent info files."""
540
t = self.get_transport()
542
t.mkdir('test_lock/held')
543
lf = LockDir(t, 'test_lock')
544
# In this case we expect the 'not held' result from peek, because peek
545
# cannot be expected to notice that there is a 'held' directory with no
547
self.assertEqual(None, lf.peek())
548
# And lock/unlock may work or give LockContention (but not any other
552
except LockContention:
553
# LockContention is ok, and expected on Windows
556
# no error is ok, and expected on POSIX (because POSIX allows
557
# os.rename over an empty directory).
559
# Currently raises TokenMismatch, but LockCorrupt would be reasonable
562
(errors.TokenMismatch, errors.LockCorrupt),
563
lf.validate_token, 'fake token')
566
class TestLockDirHooks(TestCaseWithTransport):
569
super(TestLockDirHooks, self).setUp()
573
return LockDir(self.get_transport(), 'test_lock')
575
def record_hook(self, result):
576
self._calls.append(result)
578
def test_LockDir_acquired_success(self):
579
# the LockDir.lock_acquired hook fires when a lock is acquired.
580
LockDir.hooks.install_named_hook('lock_acquired',
581
self.record_hook, 'record_hook')
584
self.assertEqual([], self._calls)
585
result = ld.attempt_lock()
586
lock_path = ld.transport.abspath(ld.path)
587
self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
589
self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
591
def test_LockDir_acquired_fail(self):
592
# the LockDir.lock_acquired hook does not fire on failure.
595
ld2 = self.get_lock()
597
# install a lock hook now, when the disk lock is locked
598
LockDir.hooks.install_named_hook('lock_acquired',
599
self.record_hook, 'record_hook')
600
self.assertRaises(errors.LockContention, ld.attempt_lock)
601
self.assertEqual([], self._calls)
603
self.assertEqual([], self._calls)
605
def test_LockDir_released_success(self):
606
# the LockDir.lock_released hook fires when a lock is acquired.
607
LockDir.hooks.install_named_hook('lock_released',
608
self.record_hook, 'record_hook')
611
self.assertEqual([], self._calls)
612
result = ld.attempt_lock()
613
self.assertEqual([], self._calls)
615
lock_path = ld.transport.abspath(ld.path)
616
self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
618
def test_LockDir_released_fail(self):
619
# the LockDir.lock_released hook does not fire on failure.
622
ld2 = self.get_lock()
624
ld2.force_break(ld2.peek())
625
LockDir.hooks.install_named_hook('lock_released',
626
self.record_hook, 'record_hook')
627
self.assertRaises(LockBroken, ld.unlock)
628
self.assertEqual([], self._calls)
630
def test_LockDir_broken_success(self):
631
# the LockDir.lock_broken hook fires when a lock is broken.
634
ld2 = self.get_lock()
635
result = ld.attempt_lock()
636
LockDir.hooks.install_named_hook('lock_broken',
637
self.record_hook, 'record_hook')
638
ld2.force_break(ld2.peek())
639
lock_path = ld.transport.abspath(ld.path)
640
self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
642
def test_LockDir_broken_failure(self):
643
# the LockDir.lock_broken hook does not fires when a lock is already
647
ld2 = self.get_lock()
648
result = ld.attempt_lock()
649
holder_info = ld2.peek()
651
LockDir.hooks.install_named_hook('lock_broken',
652
self.record_hook, 'record_hook')
653
ld2.force_break(holder_info)
654
lock_path = ld.transport.abspath(ld.path)
655
self.assertEqual([], self._calls)
658
class TestLockHeldInfo(TestCase):
659
"""Can get information about the lock holder, and detect whether they're
663
info = LockHeldInfo.for_this_process(None)
664
self.assertContainsRe(repr(info), r"LockHeldInfo\(.*\)")
666
def test_unicode(self):
667
info = LockHeldInfo.for_this_process(None)
668
self.assertContainsRe(unicode(info),
669
r'held by .* on .* \(process #\d+\), acquired .* ago')
671
def test_is_locked_by_this_process(self):
672
info = LockHeldInfo.for_this_process(None)
673
self.assertTrue(info.is_locked_by_this_process())
675
def test_is_not_locked_by_this_process(self):
676
info = LockHeldInfo.for_this_process(None)
677
info.info_dict['pid'] = '123123123123123'
678
self.assertFalse(info.is_locked_by_this_process())
680
def test_lock_holder_live_process(self):
681
"""Detect that the holder (this process) is still running."""
682
info = LockHeldInfo.for_this_process(None)
683
self.assertFalse(info.is_lock_holder_known_dead())
685
def test_lock_holder_dead_process(self):
686
"""Detect that the holder (this process) is still running."""
687
info = LockHeldInfo.for_this_process(None)
688
info.info_dict['pid'] = '123123123'
689
if sys.platform == 'win32':
691
'live lock holder detection not implemented yet on win32')
692
self.assertTrue(info.is_lock_holder_known_dead())
694
def test_lock_holder_other_machine(self):
695
"""The lock holder isn't here so we don't know if they're alive."""
696
info = LockHeldInfo.for_this_process(None)
697
info.info_dict['hostname'] = 'egg.example.com'
698
info.info_dict['pid'] = '123123123'
699
self.assertFalse(info.is_lock_holder_known_dead())
701
def test_lock_holder_other_user(self):
702
"""Only auto-break locks held by this user."""
703
info = LockHeldInfo.for_this_process(None)
704
info.info_dict['user'] = 'notme@example.com'
705
info.info_dict['pid'] = '123123123'
706
self.assertFalse(info.is_lock_holder_known_dead())
708
def test_no_good_hostname(self):
709
"""Correctly handle ambiguous hostnames.
711
If the lock's recorded with just 'localhost' we can't really trust
712
it's the same 'localhost'. (There are quite a few of them. :-)
713
So even if the process is known not to be alive, we can't say that's
716
self.overrideAttr(lockdir, 'get_host_name',
718
info = LockHeldInfo.for_this_process(None)
719
info.info_dict['pid'] = '123123123'
720
self.assertFalse(info.is_lock_holder_known_dead())
723
class TestStaleLockDir(TestCaseWithTransport):
724
"""Can automatically break stale locks.
726
:see: https://bugs.launchpad.net/bzr/+bug/220464
729
def test_auto_break_stale_lock(self):
730
"""Locks safely known to be stale are just cleaned up.
732
This generates a warning but no other user interaction.
734
# This is off by default at present; see the discussion in the bug.
735
# If you change the default, don't forget to update the docs.
736
config.GlobalConfig().set_user_option('locks.steal_dead', True)
737
# Create a lock pretending to come from a different nonexistent
738
# process on the same machine.
739
l1 = LockDir(self.get_transport(), 'a',
740
extra_holder_info={'pid': '12312313'})
741
token_1 = l1.attempt_lock()
742
l2 = LockDir(self.get_transport(), 'a')
743
token_2 = l2.attempt_lock()
744
# l1 will notice its lock was stolen.
745
self.assertRaises(errors.LockBroken,
749
def test_auto_break_stale_lock_configured_off(self):
750
"""Automatic breaking can be turned off"""
751
l1 = LockDir(self.get_transport(), 'a',
752
extra_holder_info={'pid': '12312313'})
753
token_1 = l1.attempt_lock()
754
self.addCleanup(l1.unlock)
755
l2 = LockDir(self.get_transport(), 'a')
756
# This fails now, because dead lock breaking is off by default.
757
self.assertRaises(LockContention,
759
# and it's in fact not broken