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Viewing changes to bzrlib/tests/test_lockdir.py

  • Committer: Canonical.com Patch Queue Manager
  • Date: 2011-01-11 19:11:29 UTC
  • mfrom: (5555.3.1 local_work)
  • Revision ID: pqm@pqm.ubuntu.com-20110111191129-qxzw738fmkm0run9
(vila) Add icons for tbzrcommand (iwata)

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bzrlib/tests/test_lockdir.py
1
 
# Copyright (C) 2006-2011 Canonical Ltd
 
1
# Copyright (C) 2006-2010 Canonical Ltd
2
2
#
3
3
# This program is free software; you can redistribute it and/or modify
4
4
# it under the terms of the GNU General Public License as published by
17
17
"""Tests for LockDir"""
18
18
 
19
19
import os
20
 
import sys
 
20
from threading import Thread, Lock
21
21
import time
22
22
 
23
23
import bzrlib
25
25
    config,
26
26
    errors,
27
27
    lock,
28
 
    lockdir,
29
28
    osutils,
30
29
    tests,
31
30
    transport,
37
36
    LockFailed,
38
37
    LockNotHeld,
39
38
    )
40
 
from bzrlib.lockdir import (
41
 
    LockDir,
42
 
    LockHeldInfo,
43
 
    )
 
39
from bzrlib.lockdir import LockDir
44
40
from bzrlib.tests import (
45
41
    features,
46
 
    TestCase,
47
42
    TestCaseWithTransport,
48
43
    )
49
44
from bzrlib.trace import note
50
45
 
 
46
# These tests sometimes use threads to test the behaviour of lock files with
 
47
# concurrent actors.  This is not a typical (or necessarily supported) use;
 
48
# they're really meant for guarding between processes.
 
49
 
51
50
# These tests are run on the default transport provided by the test framework
52
51
# (typically a local disk transport).  That can be changed by the --transport
53
52
# option to bzr selftest.  The required properties of the transport
54
53
# implementation are tested separately.  (The main requirement is just that
55
54
# they don't allow overwriting nonempty directories.)
56
55
 
57
 
 
58
56
class TestLockDir(TestCaseWithTransport):
59
57
    """Test LockDir operations"""
60
58
 
148
146
        self.addCleanup(lf1.unlock)
149
147
        # lock is held, should get some info on it
150
148
        info1 = lf1.peek()
151
 
        self.assertEqual(set(info1.info_dict.keys()),
152
 
            set(['user', 'nonce', 'hostname', 'pid', 'start_time']))
 
149
        self.assertEqual(set(info1.keys()),
 
150
                         set(['user', 'nonce', 'hostname', 'pid', 'start_time']))
153
151
        # should get the same info if we look at it through a different
154
152
        # instance
155
153
        info2 = LockDir(t, 'test_lock').peek()
168
166
        self.addCleanup(lf1.unlock)
169
167
        info2 = lf2.peek()
170
168
        self.assertTrue(info2)
171
 
        self.assertEqual(info2.get('nonce'), lf1.nonce)
 
169
        self.assertEqual(info2['nonce'], lf1.nonce)
172
170
 
173
171
    def test_30_lock_wait_fail(self):
174
172
        """Wait on a lock, then fail
191
189
            # it should only take about 0.4 seconds, but we allow more time in
192
190
            # case the machine is heavily loaded
193
191
            self.assertTrue(after - before <= 8.0,
194
 
                "took %f seconds to detect lock contention" % (after - before))
 
192
                    "took %f seconds to detect lock contention" % (after - before))
195
193
        finally:
196
194
            lf1.unlock()
197
195
        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.')
 
196
        self.assertEqual(self._logged_reports[0][0],
 
197
            '%s lock %s held by %s\n'
 
198
            'at %s [process #%s], acquired %s.\n'
 
199
            'Will continue to try until %s, unless '
 
200
            'you press Ctrl-C.\n'
 
201
            'See "bzr help break-lock" for more.')
 
202
        start, lock_url, user, hostname, pid, time_ago, deadline_str = \
 
203
            self._logged_reports[0][1]
 
204
        self.assertEqual(start, u'Unable to obtain')
 
205
        self.assertEqual(user, u'jrandom@example.com')
 
206
        # skip hostname
 
207
        self.assertContainsRe(pid, r'\d+')
 
208
        self.assertContainsRe(time_ago, r'.* ago')
 
209
        self.assertContainsRe(deadline_str, r'\d{2}:\d{2}:\d{2}')
204
210
 
205
211
    def test_31_lock_wait_easy(self):
206
212
        """Succeed when waiting on a lock with no contention.
218
224
            lf1.unlock()
219
225
        self.assertEqual([], self._logged_reports)
220
226
 
 
227
    def test_32_lock_wait_succeed(self):
 
228
        """Succeed when trying to acquire a lock that gets released
 
229
 
 
230
        One thread holds on a lock and then releases it; another
 
231
        tries to lock it.
 
232
        """
 
233
        # This test sometimes fails like this:
 
234
        # Traceback (most recent call last):
 
235
 
 
236
        #   File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/
 
237
        # test_lockdir.py", line 247, in test_32_lock_wait_succeed
 
238
        #     self.assertEqual(1, len(self._logged_reports))
 
239
        # AssertionError: not equal:
 
240
        # a = 1
 
241
        # b = 0
 
242
        raise tests.TestSkipped("Test fails intermittently")
 
243
        t = self.get_transport()
 
244
        lf1 = LockDir(t, 'test_lock')
 
245
        lf1.create()
 
246
        lf1.attempt_lock()
 
247
 
 
248
        def wait_and_unlock():
 
249
            time.sleep(0.1)
 
250
            lf1.unlock()
 
251
        unlocker = Thread(target=wait_and_unlock)
 
252
        unlocker.start()
 
253
        try:
 
254
            lf2 = LockDir(t, 'test_lock')
 
255
            self.setup_log_reporter(lf2)
 
256
            before = time.time()
 
257
            # wait and then lock
 
258
            lf2.wait_lock(timeout=0.4, poll=0.1)
 
259
            after = time.time()
 
260
            self.assertTrue(after - before <= 1.0)
 
261
        finally:
 
262
            unlocker.join()
 
263
 
 
264
        # There should be only 1 report, even though it should have to
 
265
        # wait for a while
 
266
        lock_base = lf2.transport.abspath(lf2.path)
 
267
        self.assertEqual(1, len(self._logged_reports))
 
268
        self.assertEqual('%s %s\n'
 
269
                         '%s\n%s\n'
 
270
                         'Will continue to try until %s\n',
 
271
                         self._logged_reports[0][0])
 
272
        args = self._logged_reports[0][1]
 
273
        self.assertEqual('Unable to obtain', args[0])
 
274
        self.assertEqual('lock %s' % (lock_base,), args[1])
 
275
        self.assertStartsWith(args[2], 'held by ')
 
276
        self.assertStartsWith(args[3], 'locked ')
 
277
        self.assertEndsWith(args[3], ' ago')
 
278
        self.assertContainsRe(args[4], r'\d\d:\d\d:\d\d')
 
279
 
 
280
    def test_34_lock_write_waits(self):
 
281
        """LockDir.lock_write() will wait for the lock."""
 
282
        # the test suite sets the default to 0 to make deadlocks fail fast.
 
283
        # change it for this test, as we want to try a manual deadlock.
 
284
        raise tests.TestSkipped('Timing-sensitive test')
 
285
        bzrlib.lockdir._DEFAULT_TIMEOUT_SECONDS = 300
 
286
        t = self.get_transport()
 
287
        lf1 = LockDir(t, 'test_lock')
 
288
        lf1.create()
 
289
        lf1.attempt_lock()
 
290
 
 
291
        def wait_and_unlock():
 
292
            time.sleep(0.1)
 
293
            lf1.unlock()
 
294
        unlocker = Thread(target=wait_and_unlock)
 
295
        unlocker.start()
 
296
        try:
 
297
            lf2 = LockDir(t, 'test_lock')
 
298
            self.setup_log_reporter(lf2)
 
299
            before = time.time()
 
300
            # wait and then lock
 
301
            lf2.lock_write()
 
302
            after = time.time()
 
303
        finally:
 
304
            unlocker.join()
 
305
 
 
306
        # There should be only 1 report, even though it should have to
 
307
        # wait for a while
 
308
        lock_base = lf2.transport.abspath(lf2.path)
 
309
        self.assertEqual(1, len(self._logged_reports))
 
310
        self.assertEqual('%s %s\n'
 
311
                         '%s\n%s\n'
 
312
                         'Will continue to try until %s\n',
 
313
                         self._logged_reports[0][0])
 
314
        args = self._logged_reports[0][1]
 
315
        self.assertEqual('Unable to obtain', args[0])
 
316
        self.assertEqual('lock %s' % (lock_base,), args[1])
 
317
        self.assertStartsWith(args[2], 'held by ')
 
318
        self.assertStartsWith(args[3], 'locked ')
 
319
        self.assertEndsWith(args[3], ' ago')
 
320
        self.assertContainsRe(args[4], r'\d\d:\d\d:\d\d')
 
321
 
 
322
    def test_35_wait_lock_changing(self):
 
323
        """LockDir.wait_lock() will report if the lock changes underneath.
 
324
 
 
325
        This is the stages we want to happen:
 
326
 
 
327
        0) Synchronization locks are created and locked.
 
328
        1) Lock1 obtains the lockdir, and releases the 'check' lock.
 
329
        2) Lock2 grabs the 'check' lock, and checks the lockdir.
 
330
           It sees the lockdir is already acquired, reports the fact,
 
331
           and unsets the 'checked' lock.
 
332
        3) Thread1 blocks on acquiring the 'checked' lock, and then tells
 
333
           Lock1 to release and acquire the lockdir. This resets the 'check'
 
334
           lock.
 
335
        4) Lock2 acquires the 'check' lock, and checks again. It notices
 
336
           that the holder of the lock has changed, and so reports a new
 
337
           lock holder.
 
338
        5) Thread1 blocks on the 'checked' lock, this time, it completely
 
339
           unlocks the lockdir, allowing Lock2 to acquire the lock.
 
340
        """
 
341
 
 
342
        raise tests.KnownFailure(
 
343
            "timing dependency in lock tests (#213182)")
 
344
 
 
345
        wait_to_check_lock = Lock()
 
346
        wait_until_checked_lock = Lock()
 
347
 
 
348
        wait_to_check_lock.acquire()
 
349
        wait_until_checked_lock.acquire()
 
350
        note('locked check and checked locks')
 
351
 
 
352
        class LockDir1(LockDir):
 
353
            """Use the synchronization points for the first lock."""
 
354
 
 
355
            def attempt_lock(self):
 
356
                # Once we have acquired the lock, it is okay for
 
357
                # the other lock to check it
 
358
                try:
 
359
                    return super(LockDir1, self).attempt_lock()
 
360
                finally:
 
361
                    note('lock1: releasing check lock')
 
362
                    wait_to_check_lock.release()
 
363
 
 
364
        class LockDir2(LockDir):
 
365
            """Use the synchronization points for the second lock."""
 
366
 
 
367
            def attempt_lock(self):
 
368
                note('lock2: waiting for check lock')
 
369
                wait_to_check_lock.acquire()
 
370
                note('lock2: acquired check lock')
 
371
                try:
 
372
                    return super(LockDir2, self).attempt_lock()
 
373
                finally:
 
374
                    note('lock2: releasing checked lock')
 
375
                    wait_until_checked_lock.release()
 
376
 
 
377
        t = self.get_transport()
 
378
        lf1 = LockDir1(t, 'test_lock')
 
379
        lf1.create()
 
380
 
 
381
        lf2 = LockDir2(t, 'test_lock')
 
382
        self.setup_log_reporter(lf2)
 
383
 
 
384
        def wait_and_switch():
 
385
            lf1.attempt_lock()
 
386
            # Block until lock2 has had a chance to check
 
387
            note('lock1: waiting 1 for checked lock')
 
388
            wait_until_checked_lock.acquire()
 
389
            note('lock1: acquired for checked lock')
 
390
            note('lock1: released lockdir')
 
391
            lf1.unlock()
 
392
            note('lock1: acquiring lockdir')
 
393
            # Create a new nonce, so the lock looks different.
 
394
            lf1.nonce = osutils.rand_chars(20)
 
395
            lf1.lock_write()
 
396
            note('lock1: acquired lockdir')
 
397
 
 
398
            # Block until lock2 has peeked again
 
399
            note('lock1: waiting 2 for checked lock')
 
400
            wait_until_checked_lock.acquire()
 
401
            note('lock1: acquired for checked lock')
 
402
            # Now unlock, and let lock 2 grab the lock
 
403
            lf1.unlock()
 
404
            wait_to_check_lock.release()
 
405
 
 
406
        unlocker = Thread(target=wait_and_switch)
 
407
        unlocker.start()
 
408
        try:
 
409
            # Wait and play against the other thread
 
410
            lf2.wait_lock(timeout=20.0, poll=0.01)
 
411
        finally:
 
412
            unlocker.join()
 
413
        lf2.unlock()
 
414
 
 
415
        # There should be 2 reports, because the lock changed
 
416
        lock_base = lf2.transport.abspath(lf2.path)
 
417
        self.assertEqual(2, len(self._logged_reports))
 
418
        lock_url = lf2.transport.abspath(lf2.path)
 
419
        self.assertEqual('%s %s\n'
 
420
                         '%s\n%s\n'
 
421
                         'Will continue to try until %s, unless '
 
422
                         'you press Ctrl-C.\n'
 
423
                         'See "bzr help break-lock" for more.',
 
424
                         self._logged_reports[0][0])
 
425
        args = self._logged_reports[0][1]
 
426
        self.assertEqual('Unable to obtain', args[0])
 
427
        self.assertEqual('lock %s' % (lock_base,), args[1])
 
428
        self.assertStartsWith(args[2], 'held by ')
 
429
        self.assertStartsWith(args[3], 'locked ')
 
430
        self.assertEndsWith(args[3], ' ago')
 
431
        self.assertContainsRe(args[4], r'\d\d:\d\d:\d\d')
 
432
 
 
433
        self.assertEqual('%s %s\n'
 
434
                         '%s\n%s\n'
 
435
                         'Will continue to try until %s, unless '
 
436
                         'you press Ctrl-C.\n'
 
437
                         'See "bzr help break-lock" for more.',
 
438
                         self._logged_reports[1][0])
 
439
        args = self._logged_reports[1][1]
 
440
        self.assertEqual('Lock owner changed for', args[0])
 
441
        self.assertEqual('lock %s' % (lock_base,), args[1])
 
442
        self.assertStartsWith(args[2], 'held by ')
 
443
        self.assertStartsWith(args[3], 'locked ')
 
444
        self.assertEndsWith(args[3], ' ago')
 
445
        self.assertContainsRe(args[4], r'\d\d:\d\d:\d\d')
 
446
 
221
447
    def test_40_confirm_easy(self):
222
448
        """Confirm a lock that's already held"""
223
449
        t = self.get_transport()
348
574
        ld.create()
349
575
        ld.lock_write()
350
576
        ld.transport.put_bytes_non_atomic('test_lock/held/info', '\0')
351
 
 
352
577
        class LoggingUIFactory(bzrlib.ui.SilentUIFactory):
353
578
            def __init__(self):
354
579
                self.prompts = []
355
 
 
356
580
            def get_boolean(self, prompt):
357
581
                self.prompts.append(('boolean', prompt))
358
582
                return True
359
 
 
360
583
        ui = LoggingUIFactory()
361
 
        self.overrideAttr(bzrlib.ui, 'ui_factory', ui)
362
 
        ld2.break_lock()
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)
 
584
        orig_factory = bzrlib.ui.ui_factory
 
585
        bzrlib.ui.ui_factory = ui
 
586
        try:
 
587
            ld2.break_lock()
 
588
            self.assertLength(1, ui.prompts)
 
589
            self.assertEqual('boolean', ui.prompts[0][0])
 
590
            self.assertStartsWith(ui.prompts[0][1], 'Break (corrupt LockDir')
 
591
            self.assertRaises(LockBroken, ld.unlock)
 
592
        finally:
 
593
            bzrlib.ui.ui_factory = orig_factory
367
594
 
368
595
    def test_break_lock_missing_info(self):
369
596
        """break_lock works even if the info file is missing (and tells the UI
374
601
        ld.create()
375
602
        ld.lock_write()
376
603
        ld.transport.delete('test_lock/held/info')
377
 
 
378
604
        class LoggingUIFactory(bzrlib.ui.SilentUIFactory):
379
605
            def __init__(self):
380
606
                self.prompts = []
381
 
 
382
607
            def get_boolean(self, prompt):
383
608
                self.prompts.append(('boolean', prompt))
384
609
                return True
385
 
 
386
610
        ui = LoggingUIFactory()
387
611
        orig_factory = bzrlib.ui.ui_factory
388
612
        bzrlib.ui.ui_factory = ui
408
632
        lf1 = LockDir(t, 'test_lock')
409
633
 
410
634
        lf1.create()
411
 
        self.assertTrue(t.has('test_lock'))
 
635
        self.failUnless(t.has('test_lock'))
412
636
 
413
637
        t.rmdir('test_lock')
414
 
        self.assertFalse(t.has('test_lock'))
 
638
        self.failIf(t.has('test_lock'))
415
639
 
416
640
        # This will create 'test_lock' if it needs to
417
641
        lf1.lock_write()
418
 
        self.assertTrue(t.has('test_lock'))
419
 
        self.assertTrue(t.has('test_lock/held/info'))
 
642
        self.failUnless(t.has('test_lock'))
 
643
        self.failUnless(t.has('test_lock/held/info'))
420
644
 
421
645
        lf1.unlock()
422
 
        self.assertFalse(t.has('test_lock/held/info'))
 
646
        self.failIf(t.has('test_lock/held/info'))
423
647
 
424
 
    def test_display_form(self):
 
648
    def test__format_lock_info(self):
425
649
        ld1 = self.get_lock()
426
650
        ld1.create()
427
651
        ld1.lock_write()
428
652
        try:
429
 
            info_list = ld1.peek().to_readable_dict()
 
653
            info_list = ld1._format_lock_info(ld1.peek())
430
654
        finally:
431
655
            ld1.unlock()
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$')
 
656
        self.assertEqual(info_list[0], u'jrandom@example.com')
 
657
        # info_list[1] is hostname. we skip this.
 
658
        self.assertContainsRe(info_list[2], '^\d+$') # pid
 
659
        self.assertContainsRe(info_list[3], r'^\d+ seconds? ago$') # time_ago
435
660
 
436
661
    def test_lock_without_email(self):
437
662
        global_config = config.GlobalConfig()
485
710
        # should be nothing before we start
486
711
        ld1.create()
487
712
        t = self.get_transport().clone('test_lock')
488
 
 
489
713
        def check_dir(a):
490
714
            self.assertEquals(a, t.list_dir('.'))
491
 
 
492
715
        check_dir([])
493
716
        # when held, that's all we see
494
717
        ld1.attempt_lock()
511
734
        t.put_bytes('test_lock/held/info', '')
512
735
        lf = LockDir(t, 'test_lock')
513
736
        info = lf.peek()
514
 
        formatted_info = info.to_readable_dict()
 
737
        formatted_info = lf._format_lock_info(info)
515
738
        self.assertEquals(
516
 
            dict(user='<unknown>', hostname='<unknown>', pid='<unknown>',
517
 
                time_ago='(unknown)'),
 
739
            ['<unknown>', '<unknown>', '<unknown>', '(unknown)'],
518
740
            formatted_info)
519
741
 
520
742
    def test_corrupt_lockdir_info(self):
653
875
        ld2.force_break(holder_info)
654
876
        lock_path = ld.transport.abspath(ld.path)
655
877
        self.assertEqual([], self._calls)
656
 
 
657
 
 
658
 
class TestLockHeldInfo(TestCase):
659
 
    """Can get information about the lock holder, and detect whether they're
660
 
    still alive."""
661
 
 
662
 
    def test_repr(self):
663
 
        info = LockHeldInfo.for_this_process(None)
664
 
        self.assertContainsRe(repr(info), r"LockHeldInfo\(.*\)")
665
 
 
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')
670
 
 
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())
674
 
 
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())
679
 
 
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())
684
 
 
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':
690
 
            self.knownFailure(
691
 
                'live lock holder detection not implemented yet on win32')
692
 
        self.assertTrue(info.is_lock_holder_known_dead())
693
 
 
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())
700
 
 
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())
707
 
 
708
 
    def test_no_good_hostname(self):
709
 
        """Correctly handle ambiguous hostnames.
710
 
 
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
714
 
        known for sure.
715
 
        """
716
 
        self.overrideAttr(lockdir, 'get_host_name',
717
 
            lambda: 'localhost')
718
 
        info = LockHeldInfo.for_this_process(None)
719
 
        info.info_dict['pid'] = '123123123'
720
 
        self.assertFalse(info.is_lock_holder_known_dead())
721
 
 
722
 
 
723
 
class TestStaleLockDir(TestCaseWithTransport):
724
 
    """Can automatically break stale locks.
725
 
 
726
 
    :see: https://bugs.launchpad.net/bzr/+bug/220464
727
 
    """
728
 
 
729
 
    def test_auto_break_stale_lock(self):
730
 
        """Locks safely known to be stale are just cleaned up.
731
 
 
732
 
        This generates a warning but no other user interaction.
733
 
        """
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,
746
 
            l1.unlock)
747
 
        l2.unlock()
748
 
 
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,
758
 
            l2.attempt_lock)
759
 
        # and it's in fact not broken
760
 
        l1.confirm()