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Viewing changes to bzrlib/tests/test_lockable_files.py

  • Committer: Canonical.com Patch Queue Manager
  • Date: 2009-07-30 14:24:06 UTC
  • mfrom: (4576.1.1 export-to-dir)
  • Revision ID: pqm@pqm.ubuntu.com-20090730142406-wg8gmxpcjz4c1z00
(bialix) Allow 'bzr export' to export into an existing (but empty)
        directory

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bzrlib/tests/test_lockable_files.py
 
1
# Copyright (C) 2005, 2006, 2008 Canonical Ltd
 
2
#
 
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.
 
7
#
 
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.
 
12
#
 
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
 
16
 
 
17
from StringIO import StringIO
 
18
 
 
19
import bzrlib
 
20
from bzrlib import (
 
21
    errors,
 
22
    lockdir,
 
23
    osutils,
 
24
    )
 
25
from bzrlib.errors import BzrBadParameterNotString, NoSuchFile, ReadOnlyError
 
26
from bzrlib.lockable_files import LockableFiles, TransportLock
 
27
from bzrlib.symbol_versioning import (
 
28
    deprecated_in,
 
29
    )
 
30
from bzrlib.tests import (
 
31
    TestCaseInTempDir,
 
32
    TestNotApplicable,
 
33
    )
 
34
from bzrlib.tests.test_smart import TestCaseWithSmartMedium
 
35
from bzrlib.tests.test_transactions import DummyWeave
 
36
from bzrlib.transactions import (PassThroughTransaction,
 
37
                                 ReadOnlyTransaction,
 
38
                                 WriteTransaction,
 
39
                                 )
 
40
from bzrlib.transport import get_transport
 
41
 
 
42
 
 
43
# these tests are applied in each parameterized suite for LockableFiles
 
44
#
 
45
# they use an old style of parameterization, but we want to remove this class
 
46
# so won't modernize them now. - mbp 20080430
 
47
class _TestLockableFiles_mixin(object):
 
48
 
 
49
    def test_read_write(self):
 
50
        self.assertRaises(NoSuchFile,
 
51
            self.applyDeprecated,
 
52
            deprecated_in((1, 5, 0)),
 
53
            self.lockable.get, 'foo')
 
54
        self.assertRaises(NoSuchFile,
 
55
            self.applyDeprecated,
 
56
            deprecated_in((1, 5, 0)),
 
57
            self.lockable.get_utf8, 'foo')
 
58
        self.lockable.lock_write()
 
59
        self.addCleanup(self.lockable.unlock)
 
60
        unicode_string = u'bar\u1234'
 
61
        self.assertEqual(4, len(unicode_string))
 
62
        byte_string = unicode_string.encode('utf-8')
 
63
        self.assertEqual(6, len(byte_string))
 
64
        self.assertRaises(UnicodeEncodeError,
 
65
            self.applyDeprecated,
 
66
            deprecated_in((1, 6, 0)),
 
67
            self.lockable.put, 'foo',
 
68
            StringIO(unicode_string))
 
69
        self.applyDeprecated(
 
70
            deprecated_in((1, 6, 0)),
 
71
            self.lockable.put,
 
72
            'foo', StringIO(byte_string))
 
73
        byte_stream = self.applyDeprecated(
 
74
            deprecated_in((1, 5, 0)),
 
75
            self.lockable.get,
 
76
            'foo')
 
77
        self.assertEqual(byte_string, byte_stream.read())
 
78
        unicode_stream = self.applyDeprecated(
 
79
            deprecated_in((1, 5, 0)),
 
80
            self.lockable.get_utf8,
 
81
            'foo')
 
82
        self.assertEqual(unicode_string,
 
83
            unicode_stream.read())
 
84
        self.assertRaises(BzrBadParameterNotString,
 
85
            self.applyDeprecated,
 
86
            deprecated_in((1, 6, 0)),
 
87
            self.lockable.put_utf8,
 
88
            'bar',
 
89
            StringIO(unicode_string))
 
90
        self.applyDeprecated(
 
91
            deprecated_in((1, 6, 0)),
 
92
            self.lockable.put_utf8,
 
93
            'bar',
 
94
            unicode_string)
 
95
        unicode_stream = self.applyDeprecated(
 
96
            deprecated_in((1, 5, 0)),
 
97
            self.lockable.get_utf8,
 
98
            'bar')
 
99
        self.assertEqual(unicode_string,
 
100
            unicode_stream.read())
 
101
        byte_stream = self.applyDeprecated(
 
102
            deprecated_in((1, 5, 0)),
 
103
            self.lockable.get,
 
104
            'bar')
 
105
        self.assertEqual(byte_string, byte_stream.read())
 
106
        self.applyDeprecated(
 
107
            deprecated_in((1, 6, 0)),
 
108
            self.lockable.put_bytes,
 
109
            'raw', 'raw\xffbytes')
 
110
        byte_stream = self.applyDeprecated(
 
111
            deprecated_in((1, 5, 0)),
 
112
            self.lockable.get,
 
113
            'raw')
 
114
        self.assertEqual('raw\xffbytes', byte_stream.read())
 
115
 
 
116
    def test_locks(self):
 
117
        self.lockable.lock_read()
 
118
        self.addCleanup(self.lockable.unlock)
 
119
        self.assertRaises(ReadOnlyError, self.lockable.put, 'foo',
 
120
                          StringIO('bar\u1234'))
 
121
 
 
122
    def test_transactions(self):
 
123
        self.assertIs(self.lockable.get_transaction().__class__,
 
124
                      PassThroughTransaction)
 
125
        self.lockable.lock_read()
 
126
        try:
 
127
            self.assertIs(self.lockable.get_transaction().__class__,
 
128
                          ReadOnlyTransaction)
 
129
        finally:
 
130
            self.lockable.unlock()
 
131
        self.assertIs(self.lockable.get_transaction().__class__,
 
132
                      PassThroughTransaction)
 
133
        self.lockable.lock_write()
 
134
        self.assertIs(self.lockable.get_transaction().__class__,
 
135
                      WriteTransaction)
 
136
        # check that finish is called:
 
137
        vf = DummyWeave('a')
 
138
        self.lockable.get_transaction().register_dirty(vf)
 
139
        self.lockable.unlock()
 
140
        self.assertTrue(vf.finished)
 
141
 
 
142
    def test__escape(self):
 
143
        self.assertEqual('%25', self.lockable._escape('%'))
 
144
 
 
145
    def test__escape_empty(self):
 
146
        self.assertEqual('', self.lockable._escape(''))
 
147
 
 
148
    def test_break_lock(self):
 
149
        # some locks are not breakable
 
150
        self.lockable.lock_write()
 
151
        try:
 
152
            self.assertRaises(AssertionError, self.lockable.break_lock)
 
153
        except NotImplementedError:
 
154
            # this lock cannot be broken
 
155
            self.lockable.unlock()
 
156
            raise TestNotApplicable("%r is not breakable" % (self.lockable,))
 
157
        l2 = self.get_lockable()
 
158
        orig_factory = bzrlib.ui.ui_factory
 
159
        # silent ui - no need for stdout
 
160
        bzrlib.ui.ui_factory = bzrlib.ui.CannedInputUIFactory([True])
 
161
        try:
 
162
            l2.break_lock()
 
163
        finally:
 
164
            bzrlib.ui.ui_factory = orig_factory
 
165
        try:
 
166
            l2.lock_write()
 
167
            l2.unlock()
 
168
        finally:
 
169
            self.assertRaises(errors.LockBroken, self.lockable.unlock)
 
170
            self.assertFalse(self.lockable.is_locked())
 
171
 
 
172
    def test_lock_write_returns_None_refuses_token(self):
 
173
        token = self.lockable.lock_write()
 
174
        self.addCleanup(self.lockable.unlock)
 
175
        if token is not None:
 
176
            # This test does not apply, because this lockable supports
 
177
            # tokens.
 
178
            raise TestNotApplicable("%r uses tokens" % (self.lockable,))
 
179
        self.assertRaises(errors.TokenLockingNotSupported,
 
180
                          self.lockable.lock_write, token='token')
 
181
 
 
182
    def test_lock_write_returns_token_when_given_token(self):
 
183
        token = self.lockable.lock_write()
 
184
        self.addCleanup(self.lockable.unlock)
 
185
        if token is None:
 
186
            # This test does not apply, because this lockable refuses
 
187
            # tokens.
 
188
            return
 
189
        new_lockable = self.get_lockable()
 
190
        token_from_new_lockable = new_lockable.lock_write(token=token)
 
191
        self.addCleanup(new_lockable.unlock)
 
192
        self.assertEqual(token, token_from_new_lockable)
 
193
 
 
194
    def test_lock_write_raises_on_token_mismatch(self):
 
195
        token = self.lockable.lock_write()
 
196
        self.addCleanup(self.lockable.unlock)
 
197
        if token is None:
 
198
            # This test does not apply, because this lockable refuses
 
199
            # tokens.
 
200
            return
 
201
        different_token = token + 'xxx'
 
202
        # Re-using the same lockable instance with a different token will
 
203
        # raise TokenMismatch.
 
204
        self.assertRaises(errors.TokenMismatch,
 
205
                          self.lockable.lock_write, token=different_token)
 
206
        # A separate instance for the same lockable will also raise
 
207
        # TokenMismatch.
 
208
        # This detects the case where a caller claims to have a lock (via
 
209
        # the token) for an external resource, but doesn't (the token is
 
210
        # different).  Clients need a separate lock object to make sure the
 
211
        # external resource is probed, whereas the existing lock object
 
212
        # might cache.
 
213
        new_lockable = self.get_lockable()
 
214
        self.assertRaises(errors.TokenMismatch,
 
215
                          new_lockable.lock_write, token=different_token)
 
216
 
 
217
    def test_lock_write_with_matching_token(self):
 
218
        # If the token matches, so no exception is raised by lock_write.
 
219
        token = self.lockable.lock_write()
 
220
        self.addCleanup(self.lockable.unlock)
 
221
        if token is None:
 
222
            # This test does not apply, because this lockable refuses
 
223
            # tokens.
 
224
            return
 
225
        # The same instance will accept a second lock_write if the specified
 
226
        # token matches.
 
227
        self.lockable.lock_write(token=token)
 
228
        self.lockable.unlock()
 
229
        # Calling lock_write on a new instance for the same lockable will
 
230
        # also succeed.
 
231
        new_lockable = self.get_lockable()
 
232
        new_lockable.lock_write(token=token)
 
233
        new_lockable.unlock()
 
234
 
 
235
    def test_unlock_after_lock_write_with_token(self):
 
236
        # If lock_write did not physically acquire the lock (because it was
 
237
        # passed a token), then unlock should not physically release it.
 
238
        token = self.lockable.lock_write()
 
239
        self.addCleanup(self.lockable.unlock)
 
240
        if token is None:
 
241
            # This test does not apply, because this lockable refuses
 
242
            # tokens.
 
243
            return
 
244
        new_lockable = self.get_lockable()
 
245
        new_lockable.lock_write(token=token)
 
246
        new_lockable.unlock()
 
247
        self.assertTrue(self.lockable.get_physical_lock_status())
 
248
 
 
249
    def test_lock_write_with_token_fails_when_unlocked(self):
 
250
        # Lock and unlock to get a superficially valid token.  This mimics a
 
251
        # likely programming error, where a caller accidentally tries to lock
 
252
        # with a token that is no longer valid (because the original lock was
 
253
        # released).
 
254
        token = self.lockable.lock_write()
 
255
        self.lockable.unlock()
 
256
        if token is None:
 
257
            # This test does not apply, because this lockable refuses
 
258
            # tokens.
 
259
            return
 
260
 
 
261
        self.assertRaises(errors.TokenMismatch,
 
262
                          self.lockable.lock_write, token=token)
 
263
 
 
264
    def test_lock_write_reenter_with_token(self):
 
265
        token = self.lockable.lock_write()
 
266
        try:
 
267
            if token is None:
 
268
                # This test does not apply, because this lockable refuses
 
269
                # tokens.
 
270
                return
 
271
            # Relock with a token.
 
272
            token_from_reentry = self.lockable.lock_write(token=token)
 
273
            try:
 
274
                self.assertEqual(token, token_from_reentry)
 
275
            finally:
 
276
                self.lockable.unlock()
 
277
        finally:
 
278
            self.lockable.unlock()
 
279
        # The lock should be unlocked on disk.  Verify that with a new lock
 
280
        # instance.
 
281
        new_lockable = self.get_lockable()
 
282
        # Calling lock_write now should work, rather than raise LockContention.
 
283
        new_lockable.lock_write()
 
284
        new_lockable.unlock()
 
285
 
 
286
    def test_second_lock_write_returns_same_token(self):
 
287
        first_token = self.lockable.lock_write()
 
288
        try:
 
289
            if first_token is None:
 
290
                # This test does not apply, because this lockable refuses
 
291
                # tokens.
 
292
                return
 
293
            # Relock the already locked lockable.  It should return the same
 
294
            # token.
 
295
            second_token = self.lockable.lock_write()
 
296
            try:
 
297
                self.assertEqual(first_token, second_token)
 
298
            finally:
 
299
                self.lockable.unlock()
 
300
        finally:
 
301
            self.lockable.unlock()
 
302
 
 
303
    def test_leave_in_place(self):
 
304
        token = self.lockable.lock_write()
 
305
        try:
 
306
            if token is None:
 
307
                # This test does not apply, because this lockable refuses
 
308
                # tokens.
 
309
                return
 
310
            self.lockable.leave_in_place()
 
311
        finally:
 
312
            self.lockable.unlock()
 
313
        # At this point, the lock is still in place on disk
 
314
        self.assertRaises(errors.LockContention, self.lockable.lock_write)
 
315
        # But should be relockable with a token.
 
316
        self.lockable.lock_write(token=token)
 
317
        self.lockable.unlock()
 
318
        # Cleanup: we should still be able to get the lock, but we restore the
 
319
        # behavior to clearing the lock when unlocking.
 
320
        self.lockable.lock_write(token=token)
 
321
        self.lockable.dont_leave_in_place()
 
322
        self.lockable.unlock()
 
323
 
 
324
    def test_dont_leave_in_place(self):
 
325
        token = self.lockable.lock_write()
 
326
        try:
 
327
            if token is None:
 
328
                # This test does not apply, because this lockable refuses
 
329
                # tokens.
 
330
                return
 
331
            self.lockable.leave_in_place()
 
332
        finally:
 
333
            self.lockable.unlock()
 
334
        # At this point, the lock is still in place on disk.
 
335
        # Acquire the existing lock with the token, and ask that it is removed
 
336
        # when this object unlocks, and unlock to trigger that removal.
 
337
        new_lockable = self.get_lockable()
 
338
        new_lockable.lock_write(token=token)
 
339
        new_lockable.dont_leave_in_place()
 
340
        new_lockable.unlock()
 
341
        # At this point, the lock is no longer on disk, so we can lock it.
 
342
        third_lockable = self.get_lockable()
 
343
        third_lockable.lock_write()
 
344
        third_lockable.unlock()
 
345
 
 
346
 
 
347
# This method of adapting tests to parameters is different to
 
348
# the TestProviderAdapters used elsewhere, but seems simpler for this
 
349
# case.
 
350
class TestLockableFiles_TransportLock(TestCaseInTempDir,
 
351
                                      _TestLockableFiles_mixin):
 
352
 
 
353
    def setUp(self):
 
354
        TestCaseInTempDir.setUp(self)
 
355
        transport = get_transport('.')
 
356
        transport.mkdir('.bzr')
 
357
        self.sub_transport = transport.clone('.bzr')
 
358
        self.lockable = self.get_lockable()
 
359
        self.lockable.create_lock()
 
360
 
 
361
    def tearDown(self):
 
362
        super(TestLockableFiles_TransportLock, self).tearDown()
 
363
        # free the subtransport so that we do not get a 5 second
 
364
        # timeout due to the SFTP connection cache.
 
365
        try:
 
366
            del self.sub_transport
 
367
        except AttributeError:
 
368
            pass
 
369
 
 
370
    def get_lockable(self):
 
371
        return LockableFiles(self.sub_transport, 'my-lock', TransportLock)
 
372
 
 
373
 
 
374
class TestLockableFiles_LockDir(TestCaseInTempDir,
 
375
                              _TestLockableFiles_mixin):
 
376
    """LockableFile tests run with LockDir underneath"""
 
377
 
 
378
    def setUp(self):
 
379
        TestCaseInTempDir.setUp(self)
 
380
        self.transport = get_transport('.')
 
381
        self.lockable = self.get_lockable()
 
382
        # the lock creation here sets mode - test_permissions on branch
 
383
        # tests that implicitly, but it might be a good idea to factor
 
384
        # out the mode checking logic and have it applied to loackable files
 
385
        # directly. RBC 20060418
 
386
        self.lockable.create_lock()
 
387
 
 
388
    def get_lockable(self):
 
389
        return LockableFiles(self.transport, 'my-lock', lockdir.LockDir)
 
390
 
 
391
    def test_lock_created(self):
 
392
        self.assertTrue(self.transport.has('my-lock'))
 
393
        self.lockable.lock_write()
 
394
        self.assertTrue(self.transport.has('my-lock/held/info'))
 
395
        self.lockable.unlock()
 
396
        self.assertFalse(self.transport.has('my-lock/held/info'))
 
397
        self.assertTrue(self.transport.has('my-lock'))
 
398
 
 
399
    def test__file_modes(self):
 
400
        self.transport.mkdir('readonly')
 
401
        osutils.make_readonly('readonly')
 
402
        lockable = LockableFiles(self.transport.clone('readonly'), 'test-lock',
 
403
                                 lockdir.LockDir)
 
404
        # The directory mode should be read-write-execute for the current user
 
405
        self.assertEqual(00700, lockable._dir_mode & 00700)
 
406
        # Files should be read-write for the current user
 
407
        self.assertEqual(00600, lockable._file_mode & 00700)
 
408
 
 
409
 
 
410
class TestLockableFiles_RemoteLockDir(TestCaseWithSmartMedium,
 
411
                              _TestLockableFiles_mixin):
 
412
    """LockableFile tests run with RemoteLockDir on a branch."""
 
413
 
 
414
    def setUp(self):
 
415
        TestCaseWithSmartMedium.setUp(self)
 
416
        # can only get a RemoteLockDir with some RemoteObject...
 
417
        # use a branch as thats what we want. These mixin tests test the end
 
418
        # to end behaviour, so stubbing out the backend and simulating would
 
419
        # defeat the purpose. We test the protocol implementation separately
 
420
        # in test_remote and test_smart as usual.
 
421
        b = self.make_branch('foo')
 
422
        self.addCleanup(b.bzrdir.transport.disconnect)
 
423
        self.transport = get_transport('.')
 
424
        self.lockable = self.get_lockable()
 
425
 
 
426
    def get_lockable(self):
 
427
        # getting a new lockable involves opening a new instance of the branch
 
428
        branch = bzrlib.branch.Branch.open(self.get_url('foo'))
 
429
        self.addCleanup(branch.bzrdir.transport.disconnect)
 
430
        return branch.control_files