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bzrlib/tests/__init__.py
29
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import atexit
31
31
import codecs
32
 
from copy import copy
 
32
import copy
33
33
from cStringIO import StringIO
34
34
import difflib
35
35
import doctest
36
36
import errno
 
37
import itertools
37
38
import logging
38
39
import math
39
40
import os
40
 
from pprint import pformat
 
41
import pprint
41
42
import random
42
43
import re
43
44
import shlex
44
45
import stat
45
 
from subprocess import Popen, PIPE, STDOUT
 
46
import subprocess
46
47
import sys
47
48
import tempfile
48
49
import threading
74
75
    ui,
75
76
    urlutils,
76
77
    registry,
 
78
    transport as _mod_transport,
77
79
    workingtree,
78
80
    )
79
81
import bzrlib.branch
103
105
    )
104
106
import bzrlib.trace
105
107
from bzrlib.transport import (
106
 
    get_transport,
107
108
    memory,
108
109
    pathfilter,
109
110
    )
110
 
import bzrlib.transport
111
111
from bzrlib.trace import mutter, note
112
112
from bzrlib.tests import (
113
113
    test_server,
114
114
    TestUtil,
 
115
    treeshape,
115
116
    )
116
117
from bzrlib.tests.http_server import HttpServer
117
118
from bzrlib.tests.TestUtil import (
118
119
                          TestSuite,
119
120
                          TestLoader,
120
121
                          )
121
 
from bzrlib.tests.treeshape import build_tree_contents
122
122
from bzrlib.ui import NullProgressView
123
123
from bzrlib.ui.text import TextUIFactory
124
124
import bzrlib.version_info_formats.format_custom
141
141
SUBUNIT_SEEK_CUR = 1
142
142
 
143
143
 
144
 
class ExtendedTestResult(unittest._TextTestResult):
 
144
class ExtendedTestResult(testtools.TextTestResult):
145
145
    """Accepts, reports and accumulates the results of running tests.
146
146
 
147
147
    Compared to the unittest version this class adds support for
168
168
        :param bench_history: Optionally, a writable file object to accumulate
169
169
            benchmark results.
170
170
        """
171
 
        unittest._TextTestResult.__init__(self, stream, descriptions, verbosity)
 
171
        testtools.TextTestResult.__init__(self, stream)
172
172
        if bench_history is not None:
173
173
            from bzrlib.version import _get_bzr_source_tree
174
174
            src_tree = _get_bzr_source_tree()
201
201
        actionTaken = "Ran"
202
202
        stopTime = time.time()
203
203
        timeTaken = stopTime - self.startTime
204
 
        self.printErrors()
205
 
        self.stream.writeln(self.separator2)
206
 
        self.stream.writeln("%s %d test%s in %.3fs" % (actionTaken,
 
204
        # GZ 2010-07-19: Seems testtools has no printErrors method, and though
 
205
        #                the parent class method is similar have to duplicate
 
206
        self._show_list('ERROR', self.errors)
 
207
        self._show_list('FAIL', self.failures)
 
208
        self.stream.write(self.sep2)
 
209
        self.stream.write("%s %d test%s in %.3fs\n\n" % (actionTaken,
207
210
                            run, run != 1 and "s" or "", timeTaken))
208
 
        self.stream.writeln()
209
211
        if not self.wasSuccessful():
210
212
            self.stream.write("FAILED (")
211
213
            failed, errored = map(len, (self.failures, self.errors))
218
220
                if failed or errored: self.stream.write(", ")
219
221
                self.stream.write("known_failure_count=%d" %
220
222
                    self.known_failure_count)
221
 
            self.stream.writeln(")")
 
223
            self.stream.write(")\n")
222
224
        else:
223
225
            if self.known_failure_count:
224
 
                self.stream.writeln("OK (known_failures=%d)" %
 
226
                self.stream.write("OK (known_failures=%d)\n" %
225
227
                    self.known_failure_count)
226
228
            else:
227
 
                self.stream.writeln("OK")
 
229
                self.stream.write("OK\n")
228
230
        if self.skip_count > 0:
229
231
            skipped = self.skip_count
230
 
            self.stream.writeln('%d test%s skipped' %
 
232
            self.stream.write('%d test%s skipped\n' %
231
233
                                (skipped, skipped != 1 and "s" or ""))
232
234
        if self.unsupported:
233
235
            for feature, count in sorted(self.unsupported.items()):
234
 
                self.stream.writeln("Missing feature '%s' skipped %d tests." %
 
236
                self.stream.write("Missing feature '%s' skipped %d tests.\n" %
235
237
                    (feature, count))
236
238
        if self._strict:
237
239
            ok = self.wasStrictlySuccessful()
275
277
 
276
278
    def _shortened_test_description(self, test):
277
279
        what = test.id()
278
 
        what = re.sub(r'^bzrlib\.(tests|benchmarks)\.', '', what)
 
280
        what = re.sub(r'^bzrlib\.tests\.', '', what)
279
281
        return what
280
282
 
281
283
    def startTest(self, test):
282
 
        unittest.TestResult.startTest(self, test)
 
284
        super(ExtendedTestResult, self).startTest(test)
283
285
        if self.count == 0:
284
286
            self.startTests()
285
287
        self.report_test_start(test)
323
325
        fails with an unexpected error.
324
326
        """
325
327
        self._post_mortem()
326
 
        unittest.TestResult.addError(self, test, err)
 
328
        super(ExtendedTestResult, self).addError(test, err)
327
329
        self.error_count += 1
328
330
        self.report_error(test, err)
329
331
        if self.stop_early:
337
339
        fails because e.g. an assert() method failed.
338
340
        """
339
341
        self._post_mortem()
340
 
        unittest.TestResult.addFailure(self, test, err)
 
342
        super(ExtendedTestResult, self).addFailure(test, err)
341
343
        self.failure_count += 1
342
344
        self.report_failure(test, err)
343
345
        if self.stop_early:
357
359
                    test.id()))
358
360
        self.report_success(test)
359
361
        self._cleanupLogFile(test)
360
 
        unittest.TestResult.addSuccess(self, test)
 
362
        super(ExtendedTestResult, self).addSuccess(test)
361
363
        test._log_contents = ''
362
364
 
363
365
    def addExpectedFailure(self, test, err):
551
553
        return '%s%s' % (indent, err[1])
552
554
 
553
555
    def report_error(self, test, err):
554
 
        self.stream.writeln('ERROR %s\n%s'
 
556
        self.stream.write('ERROR %s\n%s\n'
555
557
                % (self._testTimeString(test),
556
558
                   self._error_summary(err)))
557
559
 
558
560
    def report_failure(self, test, err):
559
 
        self.stream.writeln(' FAIL %s\n%s'
 
561
        self.stream.write(' FAIL %s\n%s\n'
560
562
                % (self._testTimeString(test),
561
563
                   self._error_summary(err)))
562
564
 
563
565
    def report_known_failure(self, test, err):
564
 
        self.stream.writeln('XFAIL %s\n%s'
 
566
        self.stream.write('XFAIL %s\n%s\n'
565
567
                % (self._testTimeString(test),
566
568
                   self._error_summary(err)))
567
569
 
568
570
    def report_success(self, test):
569
 
        self.stream.writeln('   OK %s' % self._testTimeString(test))
 
571
        self.stream.write('   OK %s\n' % self._testTimeString(test))
570
572
        for bench_called, stats in getattr(test, '_benchcalls', []):
571
 
            self.stream.writeln('LSProf output for %s(%s, %s)' % bench_called)
 
573
            self.stream.write('LSProf output for %s(%s, %s)\n' % bench_called)
572
574
            stats.pprint(file=self.stream)
573
575
        # flush the stream so that we get smooth output. This verbose mode is
574
576
        # used to show the output in PQM.
575
577
        self.stream.flush()
576
578
 
577
579
    def report_skip(self, test, reason):
578
 
        self.stream.writeln(' SKIP %s\n%s'
 
580
        self.stream.write(' SKIP %s\n%s\n'
579
581
                % (self._testTimeString(test), reason))
580
582
 
581
583
    def report_not_applicable(self, test, reason):
582
 
        self.stream.writeln('  N/A %s\n    %s'
 
584
        self.stream.write('  N/A %s\n    %s\n'
583
585
                % (self._testTimeString(test), reason))
584
586
 
585
587
    def report_unsupported(self, test, feature):
586
588
        """test cannot be run because feature is missing."""
587
 
        self.stream.writeln("NODEP %s\n    The feature '%s' is not available."
 
589
        self.stream.write("NODEP %s\n    The feature '%s' is not available.\n"
588
590
                %(self._testTimeString(test), feature))
589
591
 
590
592
 
619
621
            encode = codec.encode
620
622
        stream = osutils.UnicodeOrBytesToBytesWriter(encode, stream)
621
623
        stream.encoding = new_encoding
622
 
        self.stream = unittest._WritelnDecorator(stream)
 
624
        self.stream = stream
623
625
        self.descriptions = descriptions
624
626
        self.verbosity = verbosity
625
627
        self._bench_history = bench_history
749
751
    # XXX: Should probably unify more with CannedInputUIFactory or a
750
752
    # particular configuration of TextUIFactory, or otherwise have a clearer
751
753
    # idea of how they're supposed to be different.
752
 
    # See https://bugs.edge.launchpad.net/bzr/+bug/408213
 
754
    # See https://bugs.launchpad.net/bzr/+bug/408213
753
755
 
754
756
    def __init__(self, stdout=None, stderr=None, stdin=None):
755
757
        if stdin is not None:
943
945
 
944
946
    def permit_dir(self, name):
945
947
        """Permit a directory to be used by this test. See permit_url."""
946
 
        name_transport = get_transport(name)
 
948
        name_transport = _mod_transport.get_transport(name)
947
949
        self.permit_url(name)
948
950
        self.permit_url(name_transport.base)
949
951
 
1028
1030
        self.addCleanup(transport_server.stop_server)
1029
1031
        # Obtain a real transport because if the server supplies a password, it
1030
1032
        # will be hidden from the base on the client side.
1031
 
        t = get_transport(transport_server.get_url())
 
1033
        t = _mod_transport.get_transport(transport_server.get_url())
1032
1034
        # Some transport servers effectively chroot the backing transport;
1033
1035
        # others like SFTPServer don't - users of the transport can walk up the
1034
1036
        # transport to read the entire backing transport. This wouldn't matter
1095
1097
            message += '\n'
1096
1098
        raise AssertionError("%snot equal:\na = %s\nb = %s\n"
1097
1099
            % (message,
1098
 
               pformat(a), pformat(b)))
 
1100
               pprint.pformat(a), pprint.pformat(b)))
1099
1101
 
1100
1102
    assertEquals = assertEqual
1101
1103
 
1524
1526
            'EDITOR': None,
1525
1527
            'BZR_EMAIL': None,
1526
1528
            'BZREMAIL': None, # may still be present in the environment
1527
 
            'EMAIL': None,
 
1529
            'EMAIL': 'jrandom@example.com', # set EMAIL as bzr does not guess
1528
1530
            'BZR_PROGRESS_BAR': None,
1529
1531
            'BZR_LOG': None,
1530
1532
            'BZR_PLUGIN_PATH': None,
1986
1988
            if not allow_plugins:
1987
1989
                command.append('--no-plugins')
1988
1990
            command.extend(process_args)
1989
 
            process = self._popen(command, stdin=PIPE, stdout=PIPE, stderr=PIPE)
 
1991
            process = self._popen(command, stdin=subprocess.PIPE,
 
1992
                                  stdout=subprocess.PIPE,
 
1993
                                  stderr=subprocess.PIPE)
1990
1994
        finally:
1991
1995
            restore_environment()
1992
1996
            if cwd is not None:
2000
2004
        Allows tests to override this method to intercept the calls made to
2001
2005
        Popen for introspection.
2002
2006
        """
2003
 
        return Popen(*args, **kwargs)
 
2007
        return subprocess.Popen(*args, **kwargs)
2004
2008
 
2005
2009
    def get_source_path(self):
2006
2010
        """Return the path of the directory containing bzrlib."""
2008
2012
 
2009
2013
    def get_bzr_path(self):
2010
2014
        """Return the path of the 'bzr' executable for this test suite."""
2011
 
        bzr_path = self.get_source_path()+'/bzr'
 
2015
        bzr_path = os.path.join(self.get_source_path(), "bzr")
2012
2016
        if not os.path.isfile(bzr_path):
2013
2017
            # We are probably installed. Assume sys.argv is the right file
2014
2018
            bzr_path = sys.argv[0]
2186
2190
 
2187
2191
        :param relpath: a path relative to the base url.
2188
2192
        """
2189
 
        t = get_transport(self.get_url(relpath))
 
2193
        t = _mod_transport.get_transport(self.get_url(relpath))
2190
2194
        self.assertFalse(t.is_readonly())
2191
2195
        return t
2192
2196
 
2198
2202
 
2199
2203
        :param relpath: a path relative to the base url.
2200
2204
        """
2201
 
        t = get_transport(self.get_readonly_url(relpath))
 
2205
        t = _mod_transport.get_transport(self.get_readonly_url(relpath))
2202
2206
        self.assertTrue(t.is_readonly())
2203
2207
        return t
2204
2208
 
2334
2338
        propagating. This method ensures than a test did not leaked.
2335
2339
        """
2336
2340
        root = TestCaseWithMemoryTransport.TEST_ROOT
2337
 
        self.permit_url(get_transport(root).base)
 
2341
        self.permit_url(_mod_transport.get_transport(root).base)
2338
2342
        wt = workingtree.WorkingTree.open(root)
2339
2343
        last_rev = wt.last_revision()
2340
2344
        if last_rev != 'null:':
2385
2389
            # might be a relative or absolute path
2386
2390
            maybe_a_url = self.get_url(relpath)
2387
2391
            segments = maybe_a_url.rsplit('/', 1)
2388
 
            t = get_transport(maybe_a_url)
 
2392
            t = _mod_transport.get_transport(maybe_a_url)
2389
2393
            if len(segments) > 1 and segments[-1] not in ('', '.'):
2390
2394
                t.ensure_base()
2391
2395
            if format is None:
2408
2412
        made_control = self.make_bzrdir(relpath, format=format)
2409
2413
        return made_control.create_repository(shared=shared)
2410
2414
 
2411
 
    def make_smart_server(self, path):
 
2415
    def make_smart_server(self, path, backing_server=None):
 
2416
        if backing_server is None:
 
2417
            backing_server = self.get_server()
2412
2418
        smart_server = test_server.SmartTCPServer_for_testing()
2413
 
        self.start_server(smart_server, self.get_server())
2414
 
        remote_transport = get_transport(smart_server.get_url()).clone(path)
 
2419
        self.start_server(smart_server, backing_server)
 
2420
        remote_transport = _mod_transport.get_transport(smart_server.get_url()
 
2421
                                                   ).clone(path)
2415
2422
        return remote_transport
2416
2423
 
2417
2424
    def make_branch_and_memory_tree(self, relpath, format=None):
2482
2489
 
2483
2490
    def check_file_contents(self, filename, expect):
2484
2491
        self.log("check contents of file %s" % filename)
2485
 
        contents = file(filename, 'r').read()
 
2492
        f = file(filename)
 
2493
        try:
 
2494
            contents = f.read()
 
2495
        finally:
 
2496
            f.close()
2486
2497
        if contents != expect:
2487
2498
            self.log("expected: %r" % expect)
2488
2499
            self.log("actually: %r" % contents)
2562
2573
                "a list or a tuple. Got %r instead" % (shape,))
2563
2574
        # It's OK to just create them using forward slashes on windows.
2564
2575
        if transport is None or transport.is_readonly():
2565
 
            transport = get_transport(".")
 
2576
            transport = _mod_transport.get_transport(".")
2566
2577
        for name in shape:
2567
2578
            self.assertIsInstance(name, basestring)
2568
2579
            if name[-1] == '/':
2578
2589
                content = "contents of %s%s" % (name.encode('utf-8'), end)
2579
2590
                transport.put_bytes_non_atomic(urlutils.escape(name), content)
2580
2591
 
2581
 
    def build_tree_contents(self, shape):
2582
 
        build_tree_contents(shape)
 
2592
    build_tree_contents = staticmethod(treeshape.build_tree_contents)
2583
2593
 
2584
2594
    def assertInWorkingTree(self, path, root_path='.', tree=None):
2585
2595
        """Assert whether path or paths are in the WorkingTree"""
2737
2747
    :param pattern: A regular expression string.
2738
2748
    :return: A callable that returns True if the re matches.
2739
2749
    """
2740
 
    filter_re = osutils.re_compile_checked(pattern, 0,
2741
 
        'test filter')
 
2750
    filter_re = re.compile(pattern, 0)
2742
2751
    def condition(test):
2743
2752
        test_id = test.id()
2744
2753
        return filter_re.search(test_id)
3190
3199
 
3191
3200
def partition_tests(suite, count):
3192
3201
    """Partition suite into count lists of tests."""
3193
 
    result = []
3194
 
    tests = list(iter_suite_tests(suite))
3195
 
    tests_per_process = int(math.ceil(float(len(tests)) / count))
3196
 
    for block in range(count):
3197
 
        low_test = block * tests_per_process
3198
 
        high_test = low_test + tests_per_process
3199
 
        process_tests = tests[low_test:high_test]
3200
 
        result.append(process_tests)
3201
 
    return result
 
3202
    # This just assigns tests in a round-robin fashion.  On one hand this
 
3203
    # splits up blocks of related tests that might run faster if they shared
 
3204
    # resources, but on the other it avoids assigning blocks of slow tests to
 
3205
    # just one partition.  So the slowest partition shouldn't be much slower
 
3206
    # than the fastest.
 
3207
    partitions = [list() for i in range(count)]
 
3208
    tests = iter_suite_tests(suite)
 
3209
    for partition, test in itertools.izip(itertools.cycle(partitions), tests):
 
3210
        partition.append(test)
 
3211
    return partitions
 
3212
 
 
3213
 
 
3214
def workaround_zealous_crypto_random():
 
3215
    """Crypto.Random want to help us being secure, but we don't care here.
 
3216
 
 
3217
    This workaround some test failure related to the sftp server. Once paramiko
 
3218
    stop using the controversial API in Crypto.Random, we may get rid of it.
 
3219
    """
 
3220
    try:
 
3221
        from Crypto.Random import atfork
 
3222
        atfork()
 
3223
    except ImportError:
 
3224
        pass
3202
3225
 
3203
3226
 
3204
3227
def fork_for_tests(suite):
3230
3253
        c2pread, c2pwrite = os.pipe()
3231
3254
        pid = os.fork()
3232
3255
        if pid == 0:
 
3256
            workaround_zealous_crypto_random()
3233
3257
            try:
3234
3258
                os.close(c2pread)
3235
3259
                # Leave stderr and stdout open so we can see test noise
3296
3320
                '--subunit']
3297
3321
            if '--no-plugins' in sys.argv:
3298
3322
                argv.append('--no-plugins')
3299
 
            # stderr=STDOUT would be ideal, but until we prevent noise on
3300
 
            # stderr it can interrupt the subunit protocol.
3301
 
            process = Popen(argv, stdin=PIPE, stdout=PIPE, stderr=PIPE,
3302
 
                bufsize=1)
 
3323
            # stderr=subprocess.STDOUT would be ideal, but until we prevent
 
3324
            # noise on stderr it can interrupt the subunit protocol.
 
3325
            process = subprocess.Popen(argv, stdin=subprocess.PIPE,
 
3326
                                      stdout=subprocess.PIPE,
 
3327
                                      stderr=subprocess.PIPE,
 
3328
                                      bufsize=1)
3303
3329
            test = TestInSubprocess(process, test_list_file_name)
3304
3330
            result.append(test)
3305
3331
        except:
3354
3380
 
3355
3381
    def startTest(self, test):
3356
3382
        self.profiler = bzrlib.lsprof.BzrProfiler()
 
3383
        # Prevent deadlocks in tests that use lsprof: those tests will
 
3384
        # unavoidably fail.
 
3385
        bzrlib.lsprof.BzrProfiler.profiler_block = 0
3357
3386
        self.profiler.start()
3358
3387
        ForwardingResult.startTest(self, test)
3359
3388
 
3618
3647
        'bzrlib.doc',
3619
3648
        'bzrlib.tests.blackbox',
3620
3649
        'bzrlib.tests.commands',
 
3650
        'bzrlib.tests.doc_generate',
3621
3651
        'bzrlib.tests.per_branch',
3622
 
        'bzrlib.tests.per_bzrdir',
3623
 
        'bzrlib.tests.per_bzrdir_colo',
 
3652
        'bzrlib.tests.per_controldir',
 
3653
        'bzrlib.tests.per_controldir_colo',
3624
3654
        'bzrlib.tests.per_foreign_vcs',
3625
3655
        'bzrlib.tests.per_interrepository',
3626
3656
        'bzrlib.tests.per_intertree',
3639
3669
        'bzrlib.tests.per_workingtree',
3640
3670
        'bzrlib.tests.test__annotator',
3641
3671
        'bzrlib.tests.test__bencode',
 
3672
        'bzrlib.tests.test__btree_serializer',
3642
3673
        'bzrlib.tests.test__chk_map',
3643
3674
        'bzrlib.tests.test__dirstate_helpers',
3644
3675
        'bzrlib.tests.test__groupcompress',
3687
3718
        'bzrlib.tests.test_export',
3688
3719
        'bzrlib.tests.test_extract',
3689
3720
        'bzrlib.tests.test_fetch',
 
3721
        'bzrlib.tests.test_fixtures',
3690
3722
        'bzrlib.tests.test_fifo_cache',
3691
3723
        'bzrlib.tests.test_filters',
3692
3724
        'bzrlib.tests.test_ftp_transport',
3713
3745
        'bzrlib.tests.test_knit',
3714
3746
        'bzrlib.tests.test_lazy_import',
3715
3747
        'bzrlib.tests.test_lazy_regex',
 
3748
        'bzrlib.tests.test_library_state',
3716
3749
        'bzrlib.tests.test_lock',
3717
3750
        'bzrlib.tests.test_lockable_files',
3718
3751
        'bzrlib.tests.test_lockdir',
3720
3753
        'bzrlib.tests.test_lru_cache',
3721
3754
        'bzrlib.tests.test_lsprof',
3722
3755
        'bzrlib.tests.test_mail_client',
 
3756
        'bzrlib.tests.test_matchers',
3723
3757
        'bzrlib.tests.test_memorytree',
3724
3758
        'bzrlib.tests.test_merge',
3725
3759
        'bzrlib.tests.test_merge3',
3785
3819
        'bzrlib.tests.test_transport_log',
3786
3820
        'bzrlib.tests.test_tree',
3787
3821
        'bzrlib.tests.test_treebuilder',
 
3822
        'bzrlib.tests.test_treeshape',
3788
3823
        'bzrlib.tests.test_tsort',
3789
3824
        'bzrlib.tests.test_tuned_gzip',
3790
3825
        'bzrlib.tests.test_ui',
3794
3829
        'bzrlib.tests.test_urlutils',
3795
3830
        'bzrlib.tests.test_version',
3796
3831
        'bzrlib.tests.test_version_info',
 
3832
        'bzrlib.tests.test_versionedfile',
3797
3833
        'bzrlib.tests.test_weave',
3798
3834
        'bzrlib.tests.test_whitebox',
3799
3835
        'bzrlib.tests.test_win32utils',
3821
3857
        'bzrlib.option',
3822
3858
        'bzrlib.symbol_versioning',
3823
3859
        'bzrlib.tests',
 
3860
        'bzrlib.tests.fixtures',
3824
3861
        'bzrlib.timestamp',
3825
3862
        'bzrlib.version_info_formats.format_custom',
3826
3863
        ]
4020
4057
    :param new_id: The id to assign to it.
4021
4058
    :return: The new test.
4022
4059
    """
4023
 
    new_test = copy(test)
 
4060
    new_test = copy.copy(test)
4024
4061
    new_test.id = lambda: new_id
4025
4062
    return new_test
4026
4063
 
4087
4124
        if test_id != None:
4088
4125
            ui.ui_factory.clear_term()
4089
4126
            sys.stderr.write('\nWhile running: %s\n' % (test_id,))
 
4127
        # Ugly, but the last thing we want here is fail, so bear with it.
 
4128
        printable_e = str(e).decode(osutils.get_user_encoding(), 'replace'
 
4129
                                    ).encode('ascii', 'replace')
4090
4130
        sys.stderr.write('Unable to remove testing dir %s\n%s'
4091
 
                         % (os.path.basename(dirname), e))
 
4131
                         % (os.path.basename(dirname), printable_e))
4092
4132
 
4093
4133
 
4094
4134
class Feature(object):
4324
4364
UnicodeFilename = _UnicodeFilename()
4325
4365
 
4326
4366
 
 
4367
class _ByteStringNamedFilesystem(Feature):
 
4368
    """Is the filesystem based on bytes?"""
 
4369
 
 
4370
    def _probe(self):
 
4371
        if os.name == "posix":
 
4372
            return True
 
4373
        return False
 
4374
 
 
4375
ByteStringNamedFilesystem = _ByteStringNamedFilesystem()
 
4376
 
 
4377
 
4327
4378
class _UTF8Filesystem(Feature):
4328
4379
    """Is the filesystem UTF-8?"""
4329
4380