/brz/remove-bazaar : contents of bzrlib/tests/test

: (revision 4797.91.2)

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# Copyright (C) 2005-2010 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for the osutils wrapper."""

from cStringIO import StringIO
import errno
import os
import re
import socket
import stat
import sys
import time

from bzrlib import (
    errors,
    osutils,
    tests,
    trace,
    win32utils,
    )
from bzrlib.tests import (
    features,
    file_utils,
    test__walkdirs_win32,
    )


class _UTF8DirReaderFeature(tests.Feature):

    def _probe(self):
        try:
            from bzrlib import _readdir_pyx
            self.reader = _readdir_pyx.UTF8DirReader
            return True
        except ImportError:
            return False

    def feature_name(self):
        return 'bzrlib._readdir_pyx'

UTF8DirReaderFeature = _UTF8DirReaderFeature()

term_ios_feature = tests.ModuleAvailableFeature('termios')


def _already_unicode(s):
    return s


def _utf8_to_unicode(s):
    return s.decode('UTF-8')


def dir_reader_scenarios():
    # For each dir reader we define:

    # - native_to_unicode: a function converting the native_abspath as returned
    #   by DirReader.read_dir to its unicode representation

    # UnicodeDirReader is the fallback, it should be tested on all platforms.
    scenarios = [('unicode',
                  dict(_dir_reader_class=osutils.UnicodeDirReader,
                       _native_to_unicode=_already_unicode))]
    # Some DirReaders are platform specific and even there they may not be
    # available.
    if UTF8DirReaderFeature.available():
        from bzrlib import _readdir_pyx
        scenarios.append(('utf8',
                          dict(_dir_reader_class=_readdir_pyx.UTF8DirReader,
                               _native_to_unicode=_utf8_to_unicode)))

    if test__walkdirs_win32.win32_readdir_feature.available():
        try:
            from bzrlib import _walkdirs_win32
            scenarios.append(
                ('win32',
                 dict(_dir_reader_class=_walkdirs_win32.Win32ReadDir,
                      _native_to_unicode=_already_unicode)))
        except ImportError:
            pass
    return scenarios


def load_tests(basic_tests, module, loader):
    suite = loader.suiteClass()
    dir_reader_tests, remaining_tests = tests.split_suite_by_condition(
        basic_tests, tests.condition_isinstance(TestDirReader))
    tests.multiply_tests(dir_reader_tests, dir_reader_scenarios(), suite)
    suite.addTest(remaining_tests)
    return suite


class TestContainsWhitespace(tests.TestCase):

    def test_contains_whitespace(self):
        self.failUnless(osutils.contains_whitespace(u' '))
        self.failUnless(osutils.contains_whitespace(u'hello there'))
        self.failUnless(osutils.contains_whitespace(u'hellothere\n'))
        self.failUnless(osutils.contains_whitespace(u'hello\nthere'))
        self.failUnless(osutils.contains_whitespace(u'hello\rthere'))
        self.failUnless(osutils.contains_whitespace(u'hello\tthere'))

        # \xa0 is "Non-breaking-space" which on some python locales thinks it
        # is whitespace, but we do not.
        self.failIf(osutils.contains_whitespace(u''))
        self.failIf(osutils.contains_whitespace(u'hellothere'))
        self.failIf(osutils.contains_whitespace(u'hello\xa0there'))


class TestRename(tests.TestCaseInTempDir):

    def create_file(self, filename, content):
        f = open(filename, 'wb')
        try:
            f.write(content)
        finally:
            f.close()

    def _fancy_rename(self, a, b):
        osutils.fancy_rename(a, b, rename_func=os.rename,
                             unlink_func=os.unlink)

    def test_fancy_rename(self):
        # This should work everywhere
        self.create_file('a', 'something in a\n')
        self._fancy_rename('a', 'b')
        self.failIfExists('a')
        self.failUnlessExists('b')
        self.check_file_contents('b', 'something in a\n')

        self.create_file('a', 'new something in a\n')
        self._fancy_rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    def test_fancy_rename_fails_source_missing(self):
        # An exception should be raised, and the target should be left in place
        self.create_file('target', 'data in target\n')
        self.assertRaises((IOError, OSError), self._fancy_rename,
                          'missingsource', 'target')
        self.failUnlessExists('target')
        self.check_file_contents('target', 'data in target\n')

    def test_fancy_rename_fails_if_source_and_target_missing(self):
        self.assertRaises((IOError, OSError), self._fancy_rename,
                          'missingsource', 'missingtarget')

    def test_rename(self):
        # Rename should be semi-atomic on all platforms
        self.create_file('a', 'something in a\n')
        osutils.rename('a', 'b')
        self.failIfExists('a')
        self.failUnlessExists('b')
        self.check_file_contents('b', 'something in a\n')

        self.create_file('a', 'new something in a\n')
        osutils.rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    # TODO: test fancy_rename using a MemoryTransport

    def test_rename_change_case(self):
        # on Windows we should be able to change filename case by rename
        self.build_tree(['a', 'b/'])
        osutils.rename('a', 'A')
        osutils.rename('b', 'B')
        # we can't use failUnlessExists on case-insensitive filesystem
        # so try to check shape of the tree
        shape = sorted(os.listdir('.'))
        self.assertEquals(['A', 'B'], shape)


class TestRandChars(tests.TestCase):

    def test_01_rand_chars_empty(self):
        result = osutils.rand_chars(0)
        self.assertEqual(result, '')

    def test_02_rand_chars_100(self):
        result = osutils.rand_chars(100)
        self.assertEqual(len(result), 100)
        self.assertEqual(type(result), str)
        self.assertContainsRe(result, r'^[a-z0-9]{100}$')


class TestIsInside(tests.TestCase):

    def test_is_inside(self):
        is_inside = osutils.is_inside
        self.assertTrue(is_inside('src', 'src/foo.c'))
        self.assertFalse(is_inside('src', 'srccontrol'))
        self.assertTrue(is_inside('src', 'src/a/a/a/foo.c'))
        self.assertTrue(is_inside('foo.c', 'foo.c'))
        self.assertFalse(is_inside('foo.c', ''))
        self.assertTrue(is_inside('', 'foo.c'))

    def test_is_inside_any(self):
        SRC_FOO_C = osutils.pathjoin('src', 'foo.c')
        for dirs, fn in [(['src', 'doc'], SRC_FOO_C),
                         (['src'], SRC_FOO_C),
                         (['src'], 'src'),
                         ]:
            self.assert_(osutils.is_inside_any(dirs, fn))
        for dirs, fn in [(['src'], 'srccontrol'),
                         (['src'], 'srccontrol/foo')]:
            self.assertFalse(osutils.is_inside_any(dirs, fn))

    def test_is_inside_or_parent_of_any(self):
        for dirs, fn in [(['src', 'doc'], 'src/foo.c'),
                         (['src'], 'src/foo.c'),
                         (['src/bar.c'], 'src'),
                         (['src/bar.c', 'bla/foo.c'], 'src'),
                         (['src'], 'src'),
                         ]:
            self.assert_(osutils.is_inside_or_parent_of_any(dirs, fn))

        for dirs, fn in [(['src'], 'srccontrol'),
                         (['srccontrol/foo.c'], 'src'),
                         (['src'], 'srccontrol/foo')]:
            self.assertFalse(osutils.is_inside_or_parent_of_any(dirs, fn))


class TestRmTree(tests.TestCaseInTempDir):

    def test_rmtree(self):
        # Check to remove tree with read-only files/dirs
        os.mkdir('dir')
        f = file('dir/file', 'w')
        f.write('spam')
        f.close()
        # would like to also try making the directory readonly, but at the
        # moment python shutil.rmtree doesn't handle that properly - it would
        # need to chmod the directory before removing things inside it - deferred
        # for now -- mbp 20060505
        # osutils.make_readonly('dir')
        osutils.make_readonly('dir/file')

        osutils.rmtree('dir')

        self.failIfExists('dir/file')
        self.failIfExists('dir')


class TestDeleteAny(tests.TestCaseInTempDir):

    def test_delete_any_readonly(self):
        # from <https://bugs.launchpad.net/bzr/+bug/218206>
        self.build_tree(['d/', 'f'])
        osutils.make_readonly('d')
        osutils.make_readonly('f')

        osutils.delete_any('f')
        osutils.delete_any('d')


class TestKind(tests.TestCaseInTempDir):

    def test_file_kind(self):
        self.build_tree(['file', 'dir/'])
        self.assertEquals('file', osutils.file_kind('file'))
        self.assertEquals('directory', osutils.file_kind('dir/'))
        if osutils.has_symlinks():
            os.symlink('symlink', 'symlink')
            self.assertEquals('symlink', osutils.file_kind('symlink'))

        # TODO: jam 20060529 Test a block device
        try:
            os.lstat('/dev/null')
        except OSError, e:
            if e.errno not in (errno.ENOENT,):
                raise
        else:
            self.assertEquals('chardev', osutils.file_kind('/dev/null'))

        mkfifo = getattr(os, 'mkfifo', None)
        if mkfifo:
            mkfifo('fifo')
            try:
                self.assertEquals('fifo', osutils.file_kind('fifo'))
            finally:
                os.remove('fifo')

        AF_UNIX = getattr(socket, 'AF_UNIX', None)
        if AF_UNIX:
            s = socket.socket(AF_UNIX)
            s.bind('socket')
            try:
                self.assertEquals('socket', osutils.file_kind('socket'))
            finally:
                os.remove('socket')

    def test_kind_marker(self):
        self.assertEqual("", osutils.kind_marker("file"))
        self.assertEqual("/", osutils.kind_marker('directory'))
        self.assertEqual("/", osutils.kind_marker(osutils._directory_kind))
        self.assertEqual("@", osutils.kind_marker("symlink"))
        self.assertEqual("+", osutils.kind_marker("tree-reference"))
        self.assertRaises(errors.BzrError, osutils.kind_marker, "unknown")


class TestUmask(tests.TestCaseInTempDir):

    def test_get_umask(self):
        if sys.platform == 'win32':
            # umask always returns '0', no way to set it
            self.assertEqual(0, osutils.get_umask())
            return

        orig_umask = osutils.get_umask()
        self.addCleanup(os.umask, orig_umask)
        os.umask(0222)
        self.assertEqual(0222, osutils.get_umask())
        os.umask(0022)
        self.assertEqual(0022, osutils.get_umask())
        os.umask(0002)
        self.assertEqual(0002, osutils.get_umask())
        os.umask(0027)
        self.assertEqual(0027, osutils.get_umask())


class TestDateTime(tests.TestCase):

    def assertFormatedDelta(self, expected, seconds):
        """Assert osutils.format_delta formats as expected"""
        actual = osutils.format_delta(seconds)
        self.assertEqual(expected, actual)

    def test_format_delta(self):
        self.assertFormatedDelta('0 seconds ago', 0)
        self.assertFormatedDelta('1 second ago', 1)
        self.assertFormatedDelta('10 seconds ago', 10)
        self.assertFormatedDelta('59 seconds ago', 59)
        self.assertFormatedDelta('89 seconds ago', 89)
        self.assertFormatedDelta('1 minute, 30 seconds ago', 90)
        self.assertFormatedDelta('3 minutes, 0 seconds ago', 180)
        self.assertFormatedDelta('3 minutes, 1 second ago', 181)
        self.assertFormatedDelta('10 minutes, 15 seconds ago', 615)
        self.assertFormatedDelta('30 minutes, 59 seconds ago', 1859)
        self.assertFormatedDelta('31 minutes, 0 seconds ago', 1860)
        self.assertFormatedDelta('60 minutes, 0 seconds ago', 3600)
        self.assertFormatedDelta('89 minutes, 59 seconds ago', 5399)
        self.assertFormatedDelta('1 hour, 30 minutes ago', 5400)
        self.assertFormatedDelta('2 hours, 30 minutes ago', 9017)
        self.assertFormatedDelta('10 hours, 0 minutes ago', 36000)
        self.assertFormatedDelta('24 hours, 0 minutes ago', 86400)
        self.assertFormatedDelta('35 hours, 59 minutes ago', 129599)
        self.assertFormatedDelta('36 hours, 0 minutes ago', 129600)
        self.assertFormatedDelta('36 hours, 0 minutes ago', 129601)
        self.assertFormatedDelta('36 hours, 1 minute ago', 129660)
        self.assertFormatedDelta('36 hours, 1 minute ago', 129661)
        self.assertFormatedDelta('84 hours, 10 minutes ago', 303002)

        # We handle when time steps the wrong direction because computers
        # don't have synchronized clocks.
        self.assertFormatedDelta('84 hours, 10 minutes in the future', -303002)
        self.assertFormatedDelta('1 second in the future', -1)
        self.assertFormatedDelta('2 seconds in the future', -2)

    def test_format_date(self):
        self.assertRaises(errors.UnsupportedTimezoneFormat,
            osutils.format_date, 0, timezone='foo')
        self.assertIsInstance(osutils.format_date(0), str)
        self.assertIsInstance(osutils.format_local_date(0), unicode)
        # Testing for the actual value of the local weekday without
        # duplicating the code from format_date is difficult.
        # Instead blackbox.test_locale should check for localized
        # dates once they do occur in output strings.

    def test_format_date_with_offset_in_original_timezone(self):
        self.assertEqual("Thu 1970-01-01 00:00:00 +0000",
            osutils.format_date_with_offset_in_original_timezone(0))
        self.assertEqual("Fri 1970-01-02 03:46:40 +0000",
            osutils.format_date_with_offset_in_original_timezone(100000))
        self.assertEqual("Fri 1970-01-02 05:46:40 +0200",
            osutils.format_date_with_offset_in_original_timezone(100000, 7200))

    def test_local_time_offset(self):
        """Test that local_time_offset() returns a sane value."""
        offset = osutils.local_time_offset()
        self.assertTrue(isinstance(offset, int))
        # Test that the offset is no more than a eighteen hours in
        # either direction.
        # Time zone handling is system specific, so it is difficult to
        # do more specific tests, but a value outside of this range is
        # probably wrong.
        eighteen_hours = 18 * 3600
        self.assertTrue(-eighteen_hours < offset < eighteen_hours)

    def test_local_time_offset_with_timestamp(self):
        """Test that local_time_offset() works with a timestamp."""
        offset = osutils.local_time_offset(1000000000.1234567)
        self.assertTrue(isinstance(offset, int))
        eighteen_hours = 18 * 3600
        self.assertTrue(-eighteen_hours < offset < eighteen_hours)


class TestLinks(tests.TestCaseInTempDir):

    def test_dereference_path(self):
        self.requireFeature(tests.SymlinkFeature)
        cwd = osutils.realpath('.')
        os.mkdir('bar')
        bar_path = osutils.pathjoin(cwd, 'bar')
        # Using './' to avoid bug #1213894 (first path component not
        # dereferenced) in Python 2.4.1 and earlier
        self.assertEqual(bar_path, osutils.realpath('./bar'))
        os.symlink('bar', 'foo')
        self.assertEqual(bar_path, osutils.realpath('./foo'))

        # Does not dereference terminal symlinks
        foo_path = osutils.pathjoin(cwd, 'foo')
        self.assertEqual(foo_path, osutils.dereference_path('./foo'))

        # Dereferences parent symlinks
        os.mkdir('bar/baz')
        baz_path = osutils.pathjoin(bar_path, 'baz')
        self.assertEqual(baz_path, osutils.dereference_path('./foo/baz'))

        # Dereferences parent symlinks that are the first path element
        self.assertEqual(baz_path, osutils.dereference_path('foo/baz'))

        # Dereferences parent symlinks in absolute paths
        foo_baz_path = osutils.pathjoin(foo_path, 'baz')
        self.assertEqual(baz_path, osutils.dereference_path(foo_baz_path))

    def test_changing_access(self):
        f = file('file', 'w')
        f.write('monkey')
        f.close()

        # Make a file readonly
        osutils.make_readonly('file')
        mode = os.lstat('file').st_mode
        self.assertEqual(mode, mode & 0777555)

        # Make a file writable
        osutils.make_writable('file')
        mode = os.lstat('file').st_mode
        self.assertEqual(mode, mode | 0200)

        if osutils.has_symlinks():
            # should not error when handed a symlink
            os.symlink('nonexistent', 'dangling')
            osutils.make_readonly('dangling')
            osutils.make_writable('dangling')

    def test_host_os_dereferences_symlinks(self):
        osutils.host_os_dereferences_symlinks()


class TestCanonicalRelPath(tests.TestCaseInTempDir):

    _test_needs_features = [tests.CaseInsCasePresFilenameFeature]

    def test_canonical_relpath_simple(self):
        f = file('MixedCaseName', 'w')
        f.close()
        actual = osutils.canonical_relpath(self.test_base_dir, 'mixedcasename')
        self.failUnlessEqual('work/MixedCaseName', actual)

    def test_canonical_relpath_missing_tail(self):
        os.mkdir('MixedCaseParent')
        actual = osutils.canonical_relpath(self.test_base_dir,
                                           'mixedcaseparent/nochild')
        self.failUnlessEqual('work/MixedCaseParent/nochild', actual)


class Test_CICPCanonicalRelpath(tests.TestCaseWithTransport):

    def assertRelpath(self, expected, base, path):
        actual = osutils._cicp_canonical_relpath(base, path)
        self.assertEqual(expected, actual)

    def test_simple(self):
        self.build_tree(['MixedCaseName'])
        base = osutils.realpath(self.get_transport('.').local_abspath('.'))
        self.assertRelpath('MixedCaseName', base, 'mixedcAsename')

    def test_subdir_missing_tail(self):
        self.build_tree(['MixedCaseParent/', 'MixedCaseParent/a_child'])
        base = osutils.realpath(self.get_transport('.').local_abspath('.'))
        self.assertRelpath('MixedCaseParent/a_child', base,
                           'MixedCaseParent/a_child')
        self.assertRelpath('MixedCaseParent/a_child', base,
                           'MixedCaseParent/A_Child')
        self.assertRelpath('MixedCaseParent/not_child', base,
                           'MixedCaseParent/not_child')

    def test_at_root_slash(self):
        # We can't test this on Windows, because it has a 'MIN_ABS_PATHLENGTH'
        # check...
        if osutils.MIN_ABS_PATHLENGTH > 1:
            raise tests.TestSkipped('relpath requires %d chars'
                                    % osutils.MIN_ABS_PATHLENGTH)
        self.assertRelpath('foo', '/', '/foo')

    def test_at_root_drive(self):
        if sys.platform != 'win32':
            raise tests.TestNotApplicable('we can only test drive-letter relative'
                                          ' paths on Windows where we have drive'
                                          ' letters.')
        # see bug #322807
        # The specific issue is that when at the root of a drive, 'abspath'
        # returns "C:/" or just "/". However, the code assumes that abspath
        # always returns something like "C:/foo" or "/foo" (no trailing slash).
        self.assertRelpath('foo', 'C:/', 'C:/foo')
        self.assertRelpath('foo', 'X:/', 'X:/foo')
        self.assertRelpath('foo', 'X:/', 'X://foo')


class TestPumpFile(tests.TestCase):
    """Test pumpfile method."""

    def setUp(self):
        tests.TestCase.setUp(self)
        # create a test datablock
        self.block_size = 512
        pattern = '0123456789ABCDEF'
        self.test_data = pattern * (3 * self.block_size / len(pattern))
        self.test_data_len = len(self.test_data)

    def test_bracket_block_size(self):
        """Read data in blocks with the requested read size bracketing the
        block size."""
        # make sure test data is larger than max read size
        self.assertTrue(self.test_data_len > self.block_size)

        from_file = file_utils.FakeReadFile(self.test_data)
        to_file = StringIO()

        # read (max / 2) bytes and verify read size wasn't affected
        num_bytes_to_read = self.block_size / 2
        osutils.pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)
        self.assertEqual(from_file.get_max_read_size(), num_bytes_to_read)
        self.assertEqual(from_file.get_read_count(), 1)

        # read (max) bytes and verify read size wasn't affected
        num_bytes_to_read = self.block_size
        from_file.reset_read_count()
        osutils.pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)
        self.assertEqual(from_file.get_max_read_size(), num_bytes_to_read)
        self.assertEqual(from_file.get_read_count(), 1)

        # read (max + 1) bytes and verify read size was limited
        num_bytes_to_read = self.block_size + 1
        from_file.reset_read_count()
        osutils.pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)
        self.assertEqual(from_file.get_max_read_size(), self.block_size)
        self.assertEqual(from_file.get_read_count(), 2)

        # finish reading the rest of the data
        num_bytes_to_read = self.test_data_len - to_file.tell()
        osutils.pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)

        # report error if the data wasn't equal (we only report the size due
        # to the length of the data)
        response_data = to_file.getvalue()
        if response_data != self.test_data:
            message = "Data not equal.  Expected %d bytes, received %d."
            self.fail(message % (len(response_data), self.test_data_len))

    def test_specified_size(self):
        """Request a transfer larger than the maximum block size and verify
        that the maximum read doesn't exceed the block_size."""
        # make sure test data is larger than max read size
        self.assertTrue(self.test_data_len > self.block_size)

        # retrieve data in blocks
        from_file = file_utils.FakeReadFile(self.test_data)
        to_file = StringIO()
        osutils.pumpfile(from_file, to_file, self.test_data_len,
                         self.block_size)

        # verify read size was equal to the maximum read size
        self.assertTrue(from_file.get_max_read_size() > 0)
        self.assertEqual(from_file.get_max_read_size(), self.block_size)
        self.assertEqual(from_file.get_read_count(), 3)

        # report error if the data wasn't equal (we only report the size due
        # to the length of the data)
        response_data = to_file.getvalue()
        if response_data != self.test_data:
            message = "Data not equal.  Expected %d bytes, received %d."
            self.fail(message % (len(response_data), self.test_data_len))

    def test_to_eof(self):
        """Read to end-of-file and verify that the reads are not larger than
        the maximum read size."""
        # make sure test data is larger than max read size
        self.assertTrue(self.test_data_len > self.block_size)

        # retrieve data to EOF
        from_file = file_utils.FakeReadFile(self.test_data)
        to_file = StringIO()
        osutils.pumpfile(from_file, to_file, -1, self.block_size)

        # verify read size was equal to the maximum read size
        self.assertEqual(from_file.get_max_read_size(), self.block_size)
        self.assertEqual(from_file.get_read_count(), 4)

        # report error if the data wasn't equal (we only report the size due
        # to the length of the data)
        response_data = to_file.getvalue()
        if response_data != self.test_data:
            message = "Data not equal.  Expected %d bytes, received %d."
            self.fail(message % (len(response_data), self.test_data_len))

    def test_defaults(self):
        """Verifies that the default arguments will read to EOF -- this
        test verifies that any existing usages of pumpfile will not be broken
        with this new version."""
        # retrieve data using default (old) pumpfile method
        from_file = file_utils.FakeReadFile(self.test_data)
        to_file = StringIO()
        osutils.pumpfile(from_file, to_file)

        # report error if the data wasn't equal (we only report the size due
        # to the length of the data)
        response_data = to_file.getvalue()
        if response_data != self.test_data:
            message = "Data not equal.  Expected %d bytes, received %d."
            self.fail(message % (len(response_data), self.test_data_len))

    def test_report_activity(self):
        activity = []
        def log_activity(length, direction):
            activity.append((length, direction))
        from_file = StringIO(self.test_data)
        to_file = StringIO()
        osutils.pumpfile(from_file, to_file, buff_size=500,
                         report_activity=log_activity, direction='read')
        self.assertEqual([(500, 'read'), (500, 'read'), (500, 'read'),
                          (36, 'read')], activity)

        from_file = StringIO(self.test_data)
        to_file = StringIO()
        del activity[:]
        osutils.pumpfile(from_file, to_file, buff_size=500,
                         report_activity=log_activity, direction='write')
        self.assertEqual([(500, 'write'), (500, 'write'), (500, 'write'),
                          (36, 'write')], activity)

        # And with a limited amount of data
        from_file = StringIO(self.test_data)
        to_file = StringIO()
        del activity[:]
        osutils.pumpfile(from_file, to_file, buff_size=500, read_length=1028,
                         report_activity=log_activity, direction='read')
        self.assertEqual([(500, 'read'), (500, 'read'), (28, 'read')], activity)



class TestPumpStringFile(tests.TestCase):

    def test_empty(self):
        output = StringIO()
        osutils.pump_string_file("", output)
        self.assertEqual("", output.getvalue())

    def test_more_than_segment_size(self):
        output = StringIO()
        osutils.pump_string_file("123456789", output, 2)
        self.assertEqual("123456789", output.getvalue())

    def test_segment_size(self):
        output = StringIO()
        osutils.pump_string_file("12", output, 2)
        self.assertEqual("12", output.getvalue())

    def test_segment_size_multiple(self):
        output = StringIO()
        osutils.pump_string_file("1234", output, 2)
        self.assertEqual("1234", output.getvalue())


class TestRelpath(tests.TestCase):

    def test_simple_relpath(self):
        cwd = osutils.getcwd()
        subdir = cwd + '/subdir'
        self.assertEqual('subdir', osutils.relpath(cwd, subdir))

    def test_deep_relpath(self):
        cwd = osutils.getcwd()
        subdir = cwd + '/sub/subsubdir'
        self.assertEqual('sub/subsubdir', osutils.relpath(cwd, subdir))

    def test_not_relative(self):
        self.assertRaises(errors.PathNotChild,
                          osutils.relpath, 'C:/path', 'H:/path')
        self.assertRaises(errors.PathNotChild,
                          osutils.relpath, 'C:/', 'H:/path')


class TestSafeUnicode(tests.TestCase):

    def test_from_ascii_string(self):
        self.assertEqual(u'foobar', osutils.safe_unicode('foobar'))

    def test_from_unicode_string_ascii_contents(self):
        self.assertEqual(u'bargam', osutils.safe_unicode(u'bargam'))

    def test_from_unicode_string_unicode_contents(self):
        self.assertEqual(u'bargam\xae', osutils.safe_unicode(u'bargam\xae'))

    def test_from_utf8_string(self):
        self.assertEqual(u'foo\xae', osutils.safe_unicode('foo\xc2\xae'))

    def test_bad_utf8_string(self):
        self.assertRaises(errors.BzrBadParameterNotUnicode,
                          osutils.safe_unicode,
                          '\xbb\xbb')


class TestSafeUtf8(tests.TestCase):

    def test_from_ascii_string(self):
        f = 'foobar'
        self.assertEqual('foobar', osutils.safe_utf8(f))

    def test_from_unicode_string_ascii_contents(self):
        self.assertEqual('bargam', osutils.safe_utf8(u'bargam'))

    def test_from_unicode_string_unicode_contents(self):
        self.assertEqual('bargam\xc2\xae', osutils.safe_utf8(u'bargam\xae'))

    def test_from_utf8_string(self):
        self.assertEqual('foo\xc2\xae', osutils.safe_utf8('foo\xc2\xae'))

    def test_bad_utf8_string(self):
        self.assertRaises(errors.BzrBadParameterNotUnicode,
                          osutils.safe_utf8, '\xbb\xbb')


class TestSafeRevisionId(tests.TestCase):

    def test_from_ascii_string(self):
        # this shouldn't give a warning because it's getting an ascii string
        self.assertEqual('foobar', osutils.safe_revision_id('foobar'))

    def test_from_unicode_string_ascii_contents(self):
        self.assertEqual('bargam',
                         osutils.safe_revision_id(u'bargam', warn=False))

    def test_from_unicode_deprecated(self):
        self.assertEqual('bargam',
            self.callDeprecated([osutils._revision_id_warning],
                                osutils.safe_revision_id, u'bargam'))

    def test_from_unicode_string_unicode_contents(self):
        self.assertEqual('bargam\xc2\xae',
                         osutils.safe_revision_id(u'bargam\xae', warn=False))

    def test_from_utf8_string(self):
        self.assertEqual('foo\xc2\xae',
                         osutils.safe_revision_id('foo\xc2\xae'))

    def test_none(self):
        """Currently, None is a valid revision_id"""
        self.assertEqual(None, osutils.safe_revision_id(None))


class TestSafeFileId(tests.TestCase):

    def test_from_ascii_string(self):
        self.assertEqual('foobar', osutils.safe_file_id('foobar'))

    def test_from_unicode_string_ascii_contents(self):
        self.assertEqual('bargam', osutils.safe_file_id(u'bargam', warn=False))

    def test_from_unicode_deprecated(self):
        self.assertEqual('bargam',
            self.callDeprecated([osutils._file_id_warning],
                                osutils.safe_file_id, u'bargam'))

    def test_from_unicode_string_unicode_contents(self):
        self.assertEqual('bargam\xc2\xae',
                         osutils.safe_file_id(u'bargam\xae', warn=False))

    def test_from_utf8_string(self):
        self.assertEqual('foo\xc2\xae',
                         osutils.safe_file_id('foo\xc2\xae'))

    def test_none(self):
        """Currently, None is a valid revision_id"""
        self.assertEqual(None, osutils.safe_file_id(None))


class TestWin32Funcs(tests.TestCase):
    """Test that _win32 versions of os utilities return appropriate paths."""

    def test_abspath(self):
        self.assertEqual('C:/foo', osutils._win32_abspath('C:\\foo'))
        self.assertEqual('C:/foo', osutils._win32_abspath('C:/foo'))
        self.assertEqual('//HOST/path', osutils._win32_abspath(r'\\HOST\path'))
        self.assertEqual('//HOST/path', osutils._win32_abspath('//HOST/path'))

    def test_realpath(self):
        self.assertEqual('C:/foo', osutils._win32_realpath('C:\\foo'))
        self.assertEqual('C:/foo', osutils._win32_realpath('C:/foo'))

    def test_pathjoin(self):
        self.assertEqual('path/to/foo',
                         osutils._win32_pathjoin('path', 'to', 'foo'))
        self.assertEqual('C:/foo',
                         osutils._win32_pathjoin('path\\to', 'C:\\foo'))
        self.assertEqual('C:/foo',
                         osutils._win32_pathjoin('path/to', 'C:/foo'))
        self.assertEqual('path/to/foo',
                         osutils._win32_pathjoin('path/to/', 'foo'))
        self.assertEqual('/foo',
                         osutils._win32_pathjoin('C:/path/to/', '/foo'))
        self.assertEqual('/foo',
                         osutils._win32_pathjoin('C:\\path\\to\\', '\\foo'))

    def test_normpath(self):
        self.assertEqual('path/to/foo',
                         osutils._win32_normpath(r'path\\from\..\to\.\foo'))
        self.assertEqual('path/to/foo',
                         osutils._win32_normpath('path//from/../to/./foo'))

    def test_getcwd(self):
        cwd = osutils._win32_getcwd()
        os_cwd = os.getcwdu()
        self.assertEqual(os_cwd[1:].replace('\\', '/'), cwd[1:])
        # win32 is inconsistent whether it returns lower or upper case
        # and even if it was consistent the user might type the other
        # so we force it to uppercase
        # running python.exe under cmd.exe return capital C:\\
        # running win32 python inside a cygwin shell returns lowercase
        self.assertEqual(os_cwd[0].upper(), cwd[0])

    def test_fixdrive(self):
        self.assertEqual('H:/foo', osutils._win32_fixdrive('h:/foo'))
        self.assertEqual('H:/foo', osutils._win32_fixdrive('H:/foo'))
        self.assertEqual('C:\\foo', osutils._win32_fixdrive('c:\\foo'))

    def test_win98_abspath(self):
        # absolute path
        self.assertEqual('C:/foo', osutils._win98_abspath('C:\\foo'))
        self.assertEqual('C:/foo', osutils._win98_abspath('C:/foo'))
        # UNC path
        self.assertEqual('//HOST/path', osutils._win98_abspath(r'\\HOST\path'))
        self.assertEqual('//HOST/path', osutils._win98_abspath('//HOST/path'))
        # relative path
        cwd = osutils.getcwd().rstrip('/')
        drive = osutils._nt_splitdrive(cwd)[0]
        self.assertEqual(cwd+'/path', osutils._win98_abspath('path'))
        self.assertEqual(drive+'/path', osutils._win98_abspath('/path'))
        # unicode path
        u = u'\u1234'
        self.assertEqual(cwd+'/'+u, osutils._win98_abspath(u))


class TestWin32FuncsDirs(tests.TestCaseInTempDir):
    """Test win32 functions that create files."""

    def test_getcwd(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        os.mkdir(u'mu-\xb5')
        os.chdir(u'mu-\xb5')
        # TODO: jam 20060427 This will probably fail on Mac OSX because
        #       it will change the normalization of B\xe5gfors
        #       Consider using a different unicode character, or make
        #       osutils.getcwd() renormalize the path.
        self.assertEndsWith(osutils._win32_getcwd(), u'mu-\xb5')

    def test_minimum_path_selection(self):
        self.assertEqual(set(),
            osutils.minimum_path_selection([]))
        self.assertEqual(set(['a']),
            osutils.minimum_path_selection(['a']))
        self.assertEqual(set(['a', 'b']),
            osutils.minimum_path_selection(['a', 'b']))
        self.assertEqual(set(['a/', 'b']),
            osutils.minimum_path_selection(['a/', 'b']))
        self.assertEqual(set(['a/', 'b']),
            osutils.minimum_path_selection(['a/c', 'a/', 'b']))
        self.assertEqual(set(['a-b', 'a', 'a0b']),
            osutils.minimum_path_selection(['a-b', 'a/b', 'a0b', 'a']))

    def test_mkdtemp(self):
        tmpdir = osutils._win32_mkdtemp(dir='.')
        self.assertFalse('\\' in tmpdir)

    def test_rename(self):
        a = open('a', 'wb')
        a.write('foo\n')
        a.close()
        b = open('b', 'wb')
        b.write('baz\n')
        b.close()

        osutils._win32_rename('b', 'a')
        self.failUnlessExists('a')
        self.failIfExists('b')
        self.assertFileEqual('baz\n', 'a')

    def test_rename_missing_file(self):
        a = open('a', 'wb')
        a.write('foo\n')
        a.close()

        try:
            osutils._win32_rename('b', 'a')
        except (IOError, OSError), e:
            self.assertEqual(errno.ENOENT, e.errno)
        self.assertFileEqual('foo\n', 'a')

    def test_rename_missing_dir(self):
        os.mkdir('a')
        try:
            osutils._win32_rename('b', 'a')
        except (IOError, OSError), e:
            self.assertEqual(errno.ENOENT, e.errno)

    def test_rename_current_dir(self):
        os.mkdir('a')
        os.chdir('a')
        # You can't rename the working directory
        # doing rename non-existant . usually
        # just raises ENOENT, since non-existant
        # doesn't exist.
        try:
            osutils._win32_rename('b', '.')
        except (IOError, OSError), e:
            self.assertEqual(errno.ENOENT, e.errno)

    def test_splitpath(self):
        def check(expected, path):
            self.assertEqual(expected, osutils.splitpath(path))

        check(['a'], 'a')
        check(['a', 'b'], 'a/b')
        check(['a', 'b'], 'a/./b')
        check(['a', '.b'], 'a/.b')
        check(['a', '.b'], 'a\\.b')

        self.assertRaises(errors.BzrError, osutils.splitpath, 'a/../b')


class TestParentDirectories(tests.TestCaseInTempDir):
    """Test osutils.parent_directories()"""

    def test_parent_directories(self):
        self.assertEqual([], osutils.parent_directories('a'))
        self.assertEqual(['a'], osutils.parent_directories('a/b'))
        self.assertEqual(['a/b', 'a'], osutils.parent_directories('a/b/c'))


class TestMacFuncsDirs(tests.TestCaseInTempDir):
    """Test mac special functions that require directories."""

    def test_getcwd(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        os.mkdir(u'B\xe5gfors')
        os.chdir(u'B\xe5gfors')
        self.assertEndsWith(osutils._mac_getcwd(), u'B\xe5gfors')

    def test_getcwd_nonnorm(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        # Test that _mac_getcwd() will normalize this path
        os.mkdir(u'Ba\u030agfors')
        os.chdir(u'Ba\u030agfors')
        self.assertEndsWith(osutils._mac_getcwd(), u'B\xe5gfors')


class TestChunksToLines(tests.TestCase):

    def test_smoketest(self):
        self.assertEqual(['foo\n', 'bar\n', 'baz\n'],
                         osutils.chunks_to_lines(['foo\nbar', '\nbaz\n']))
        self.assertEqual(['foo\n', 'bar\n', 'baz\n'],
                         osutils.chunks_to_lines(['foo\n', 'bar\n', 'baz\n']))

    def test_osutils_binding(self):
        from bzrlib.tests import test__chunks_to_lines
        if test__chunks_to_lines.compiled_chunkstolines_feature.available():
            from bzrlib._chunks_to_lines_pyx import chunks_to_lines
        else:
            from bzrlib._chunks_to_lines_py import chunks_to_lines
        self.assertIs(chunks_to_lines, osutils.chunks_to_lines)


class TestSplitLines(tests.TestCase):

    def test_split_unicode(self):
        self.assertEqual([u'foo\n', u'bar\xae'],
                         osutils.split_lines(u'foo\nbar\xae'))
        self.assertEqual([u'foo\n', u'bar\xae\n'],
                         osutils.split_lines(u'foo\nbar\xae\n'))

    def test_split_with_carriage_returns(self):
        self.assertEqual(['foo\rbar\n'],
                         osutils.split_lines('foo\rbar\n'))


class TestWalkDirs(tests.TestCaseInTempDir):

    def assertExpectedBlocks(self, expected, result):
        self.assertEqual(expected,
                         [(dirinfo, [line[0:3] for line in block])
                          for dirinfo, block in result])

    def test_walkdirs(self):
        tree = [
            '.bzr',
            '0file',
            '1dir/',
            '1dir/0file',
            '1dir/1dir/',
            '2file'
            ]
        self.build_tree(tree)
        expected_dirblocks = [
                (('', '.'),
                 [('0file', '0file', 'file'),
                  ('1dir', '1dir', 'directory'),
                  ('2file', '2file', 'file'),
                 ]
                ),
                (('1dir', './1dir'),
                 [('1dir/0file', '0file', 'file'),
                  ('1dir/1dir', '1dir', 'directory'),
                 ]
                ),
                (('1dir/1dir', './1dir/1dir'),
                 [
                 ]
                ),
            ]
        result = []
        found_bzrdir = False
        for dirdetail, dirblock in osutils.walkdirs('.'):
            if len(dirblock) and dirblock[0][1] == '.bzr':
                # this tests the filtering of selected paths
                found_bzrdir = True
                del dirblock[0]
            result.append((dirdetail, dirblock))

        self.assertTrue(found_bzrdir)
        self.assertExpectedBlocks(expected_dirblocks, result)
        # you can search a subdir only, with a supplied prefix.
        result = []
        for dirblock in osutils.walkdirs('./1dir', '1dir'):
            result.append(dirblock)
        self.assertExpectedBlocks(expected_dirblocks[1:], result)

    def test_walkdirs_os_error(self):
        # <https://bugs.launchpad.net/bzr/+bug/338653>
        # Pyrex readdir didn't raise useful messages if it had an error
        # reading the directory
        if sys.platform == 'win32':
            raise tests.TestNotApplicable(
                "readdir IOError not tested on win32")
        self.requireFeature(features.not_running_as_root)
        os.mkdir("test-unreadable")
        os.chmod("test-unreadable", 0000)
        # must chmod it back so that it can be removed
        self.addCleanup(os.chmod, "test-unreadable", 0700)
        # The error is not raised until the generator is actually evaluated.
        # (It would be ok if it happened earlier but at the moment it
        # doesn't.)
        e = self.assertRaises(OSError, list, osutils._walkdirs_utf8("."))
        self.assertEquals('./test-unreadable', e.filename)
        self.assertEquals(errno.EACCES, e.errno)
        # Ensure the message contains the file name
        self.assertContainsRe(str(e), "\./test-unreadable")

    def test__walkdirs_utf8(self):
        tree = [
            '.bzr',
            '0file',
            '1dir/',
            '1dir/0file',
            '1dir/1dir/',
            '2file'
            ]
        self.build_tree(tree)
        expected_dirblocks = [
                (('', '.'),
                 [('0file', '0file', 'file'),
                  ('1dir', '1dir', 'directory'),
                  ('2file', '2file', 'file'),
                 ]
                ),
                (('1dir', './1dir'),
                 [('1dir/0file', '0file', 'file'),
                  ('1dir/1dir', '1dir', 'directory'),
                 ]
                ),
                (('1dir/1dir', './1dir/1dir'),
                 [
                 ]
                ),
            ]
        result = []
        found_bzrdir = False
        for dirdetail, dirblock in osutils._walkdirs_utf8('.'):
            if len(dirblock) and dirblock[0][1] == '.bzr':
                # this tests the filtering of selected paths
                found_bzrdir = True
                del dirblock[0]
            result.append((dirdetail, dirblock))

        self.assertTrue(found_bzrdir)
        self.assertExpectedBlocks(expected_dirblocks, result)

        # you can search a subdir only, with a supplied prefix.
        result = []
        for dirblock in osutils.walkdirs('./1dir', '1dir'):
            result.append(dirblock)
        self.assertExpectedBlocks(expected_dirblocks[1:], result)

    def _filter_out_stat(self, result):
        """Filter out the stat value from the walkdirs result"""
        for dirdetail, dirblock in result:
            new_dirblock = []
            for info in dirblock:
                # Ignore info[3] which is the stat
                new_dirblock.append((info[0], info[1], info[2], info[4]))
            dirblock[:] = new_dirblock

    def _save_platform_info(self):
        cur_winver = win32utils.winver
        cur_fs_enc = osutils._fs_enc
        cur_dir_reader = osutils._selected_dir_reader
        def restore():
            win32utils.winver = cur_winver
            osutils._fs_enc = cur_fs_enc
            osutils._selected_dir_reader = cur_dir_reader
        self.addCleanup(restore)

    def assertDirReaderIs(self, expected):
        """Assert the right implementation for _walkdirs_utf8 is chosen."""
        # Force it to redetect
        osutils._selected_dir_reader = None
        # Nothing to list, but should still trigger the selection logic
        self.assertEqual([(('', '.'), [])], list(osutils._walkdirs_utf8('.')))
        self.assertIsInstance(osutils._selected_dir_reader, expected)

    def test_force_walkdirs_utf8_fs_utf8(self):
        self.requireFeature(UTF8DirReaderFeature)
        self._save_platform_info()
        win32utils.winver = None # Avoid the win32 detection code
        osutils._fs_enc = 'UTF-8'
        self.assertDirReaderIs(UTF8DirReaderFeature.reader)

    def test_force_walkdirs_utf8_fs_ascii(self):
        self.requireFeature(UTF8DirReaderFeature)
        self._save_platform_info()
        win32utils.winver = None # Avoid the win32 detection code
        osutils._fs_enc = 'US-ASCII'
        self.assertDirReaderIs(UTF8DirReaderFeature.reader)

    def test_force_walkdirs_utf8_fs_ANSI(self):
        self.requireFeature(UTF8DirReaderFeature)
        self._save_platform_info()
        win32utils.winver = None # Avoid the win32 detection code
        osutils._fs_enc = 'ANSI_X3.4-1968'
        self.assertDirReaderIs(UTF8DirReaderFeature.reader)

    def test_force_walkdirs_utf8_fs_latin1(self):
        self._save_platform_info()
        win32utils.winver = None # Avoid the win32 detection code
        osutils._fs_enc = 'latin1'
        self.assertDirReaderIs(osutils.UnicodeDirReader)

    def test_force_walkdirs_utf8_nt(self):
        # Disabled because the thunk of the whole walkdirs api is disabled.
        self.requireFeature(test__walkdirs_win32.win32_readdir_feature)
        self._save_platform_info()
        win32utils.winver = 'Windows NT'
        from bzrlib._walkdirs_win32 import Win32ReadDir
        self.assertDirReaderIs(Win32ReadDir)

    def test_force_walkdirs_utf8_98(self):
        self.requireFeature(test__walkdirs_win32.win32_readdir_feature)
        self._save_platform_info()
        win32utils.winver = 'Windows 98'
        self.assertDirReaderIs(osutils.UnicodeDirReader)

    def test_unicode_walkdirs(self):
        """Walkdirs should always return unicode paths."""
        self.requireFeature(tests.UnicodeFilenameFeature)
        name0 = u'0file-\xb6'
        name1 = u'1dir-\u062c\u0648'
        name2 = u'2file-\u0633'
        tree = [
            name0,
            name1 + '/',
            name1 + '/' + name0,
            name1 + '/' + name1 + '/',
            name2,
            ]
        self.build_tree(tree)
        expected_dirblocks = [
                ((u'', u'.'),
                 [(name0, name0, 'file', './' + name0),
                  (name1, name1, 'directory', './' + name1),
                  (name2, name2, 'file', './' + name2),
                 ]
                ),
                ((name1, './' + name1),
                 [(name1 + '/' + name0, name0, 'file', './' + name1
                                                        + '/' + name0),
                  (name1 + '/' + name1, name1, 'directory', './' + name1
                                                            + '/' + name1),
                 ]
                ),
                ((name1 + '/' + name1, './' + name1 + '/' + name1),
                 [
                 ]
                ),
            ]
        result = list(osutils.walkdirs('.'))
        self._filter_out_stat(result)
        self.assertEqual(expected_dirblocks, result)
        result = list(osutils.walkdirs(u'./'+name1, name1))
        self._filter_out_stat(result)
        self.assertEqual(expected_dirblocks[1:], result)

    def test_unicode__walkdirs_utf8(self):
        """Walkdirs_utf8 should always return utf8 paths.

        The abspath portion might be in unicode or utf-8
        """
        self.requireFeature(tests.UnicodeFilenameFeature)
        name0 = u'0file-\xb6'
        name1 = u'1dir-\u062c\u0648'
        name2 = u'2file-\u0633'
        tree = [
            name0,
            name1 + '/',
            name1 + '/' + name0,
            name1 + '/' + name1 + '/',
            name2,
            ]
        self.build_tree(tree)
        name0 = name0.encode('utf8')
        name1 = name1.encode('utf8')
        name2 = name2.encode('utf8')

        expected_dirblocks = [
                (('', '.'),
                 [(name0, name0, 'file', './' + name0),
                  (name1, name1, 'directory', './' + name1),
                  (name2, name2, 'file', './' + name2),
                 ]
                ),
                ((name1, './' + name1),
                 [(name1 + '/' + name0, name0, 'file', './' + name1
                                                        + '/' + name0),
                  (name1 + '/' + name1, name1, 'directory', './' + name1
                                                            + '/' + name1),
                 ]
                ),
                ((name1 + '/' + name1, './' + name1 + '/' + name1),
                 [
                 ]
                ),
            ]
        result = []
        # For ease in testing, if walkdirs_utf8 returns Unicode, assert that
        # all abspaths are Unicode, and encode them back into utf8.
        for dirdetail, dirblock in osutils._walkdirs_utf8('.'):
            self.assertIsInstance(dirdetail[0], str)
            if isinstance(dirdetail[1], unicode):
                dirdetail = (dirdetail[0], dirdetail[1].encode('utf8'))
                dirblock = [list(info) for info in dirblock]
                for info in dirblock:
                    self.assertIsInstance(info[4], unicode)
                    info[4] = info[4].encode('utf8')
            new_dirblock = []
            for info in dirblock:
                self.assertIsInstance(info[0], str)
                self.assertIsInstance(info[1], str)
                self.assertIsInstance(info[4], str)
                # Remove the stat information
                new_dirblock.append((info[0], info[1], info[2], info[4]))
            result.append((dirdetail, new_dirblock))
        self.assertEqual(expected_dirblocks, result)

    def test__walkdirs_utf8_with_unicode_fs(self):
        """UnicodeDirReader should be a safe fallback everywhere

        The abspath portion should be in unicode
        """
        self.requireFeature(tests.UnicodeFilenameFeature)
        # Use the unicode reader. TODO: split into driver-and-driven unit
        # tests.
        self._save_platform_info()
        osutils._selected_dir_reader = osutils.UnicodeDirReader()
        name0u = u'0file-\xb6'
        name1u = u'1dir-\u062c\u0648'
        name2u = u'2file-\u0633'
        tree = [
            name0u,
            name1u + '/',
            name1u + '/' + name0u,
            name1u + '/' + name1u + '/',
            name2u,
            ]
        self.build_tree(tree)
        name0 = name0u.encode('utf8')
        name1 = name1u.encode('utf8')
        name2 = name2u.encode('utf8')

        # All of the abspaths should be in unicode, all of the relative paths
        # should be in utf8
        expected_dirblocks = [
                (('', '.'),
                 [(name0, name0, 'file', './' + name0u),
                  (name1, name1, 'directory', './' + name1u),
                  (name2, name2, 'file', './' + name2u),
                 ]
                ),
                ((name1, './' + name1u),
                 [(name1 + '/' + name0, name0, 'file', './' + name1u
                                                        + '/' + name0u),
                  (name1 + '/' + name1, name1, 'directory', './' + name1u
                                                            + '/' + name1u),
                 ]
                ),
                ((name1 + '/' + name1, './' + name1u + '/' + name1u),
                 [
                 ]
                ),
            ]
        result = list(osutils._walkdirs_utf8('.'))
        self._filter_out_stat(result)
        self.assertEqual(expected_dirblocks, result)

    def test__walkdirs_utf8_win32readdir(self):
        self.requireFeature(test__walkdirs_win32.win32_readdir_feature)
        self.requireFeature(tests.UnicodeFilenameFeature)
        from bzrlib._walkdirs_win32 import Win32ReadDir
        self._save_platform_info()
        osutils._selected_dir_reader = Win32ReadDir()
        name0u = u'0file-\xb6'
        name1u = u'1dir-\u062c\u0648'
        name2u = u'2file-\u0633'
        tree = [
            name0u,
            name1u + '/',
            name1u + '/' + name0u,
            name1u + '/' + name1u + '/',
            name2u,
            ]
        self.build_tree(tree)
        name0 = name0u.encode('utf8')
        name1 = name1u.encode('utf8')
        name2 = name2u.encode('utf8')

        # All of the abspaths should be in unicode, all of the relative paths
        # should be in utf8
        expected_dirblocks = [
                (('', '.'),
                 [(name0, name0, 'file', './' + name0u),
                  (name1, name1, 'directory', './' + name1u),
                  (name2, name2, 'file', './' + name2u),
                 ]
                ),
                ((name1, './' + name1u),
                 [(name1 + '/' + name0, name0, 'file', './' + name1u
                                                        + '/' + name0u),
                  (name1 + '/' + name1, name1, 'directory', './' + name1u
                                                            + '/' + name1u),
                 ]
                ),
                ((name1 + '/' + name1, './' + name1u + '/' + name1u),
                 [
                 ]
                ),
            ]
        result = list(osutils._walkdirs_utf8(u'.'))
        self._filter_out_stat(result)
        self.assertEqual(expected_dirblocks, result)

    def assertStatIsCorrect(self, path, win32stat):
        os_stat = os.stat(path)
        self.assertEqual(os_stat.st_size, win32stat.st_size)
        self.assertAlmostEqual(os_stat.st_mtime, win32stat.st_mtime, places=4)
        self.assertAlmostEqual(os_stat.st_ctime, win32stat.st_ctime, places=4)
        self.assertAlmostEqual(os_stat.st_atime, win32stat.st_atime, places=4)
        self.assertEqual(os_stat.st_dev, win32stat.st_dev)
        self.assertEqual(os_stat.st_ino, win32stat.st_ino)
        self.assertEqual(os_stat.st_mode, win32stat.st_mode)

    def test__walkdirs_utf_win32_find_file_stat_file(self):
        """make sure our Stat values are valid"""
        self.requireFeature(test__walkdirs_win32.win32_readdir_feature)
        self.requireFeature(tests.UnicodeFilenameFeature)
        from bzrlib._walkdirs_win32 import Win32ReadDir
        name0u = u'0file-\xb6'
        name0 = name0u.encode('utf8')
        self.build_tree([name0u])
        # I hate to sleep() here, but I'm trying to make the ctime different
        # from the mtime
        time.sleep(2)
        f = open(name0u, 'ab')
        try:
            f.write('just a small update')
        finally:
            f.close()

        result = Win32ReadDir().read_dir('', u'.')
        entry = result[0]
        self.assertEqual((name0, name0, 'file'), entry[:3])
        self.assertEqual(u'./' + name0u, entry[4])
        self.assertStatIsCorrect(entry[4], entry[3])
        self.assertNotEqual(entry[3].st_mtime, entry[3].st_ctime)

    def test__walkdirs_utf_win32_find_file_stat_directory(self):
        """make sure our Stat values are valid"""
        self.requireFeature(test__walkdirs_win32.win32_readdir_feature)
        self.requireFeature(tests.UnicodeFilenameFeature)
        from bzrlib._walkdirs_win32 import Win32ReadDir
        name0u = u'0dir-\u062c\u0648'
        name0 = name0u.encode('utf8')
        self.build_tree([name0u + '/'])

        result = Win32ReadDir().read_dir('', u'.')
        entry = result[0]
        self.assertEqual((name0, name0, 'directory'), entry[:3])
        self.assertEqual(u'./' + name0u, entry[4])
        self.assertStatIsCorrect(entry[4], entry[3])

    def assertPathCompare(self, path_less, path_greater):
        """check that path_less and path_greater compare correctly."""
        self.assertEqual(0, osutils.compare_paths_prefix_order(
            path_less, path_less))
        self.assertEqual(0, osutils.compare_paths_prefix_order(
            path_greater, path_greater))
        self.assertEqual(-1, osutils.compare_paths_prefix_order(
            path_less, path_greater))
        self.assertEqual(1, osutils.compare_paths_prefix_order(
            path_greater, path_less))

    def test_compare_paths_prefix_order(self):
        # root before all else
        self.assertPathCompare("/", "/a")
        # alpha within a dir
        self.assertPathCompare("/a", "/b")
        self.assertPathCompare("/b", "/z")
        # high dirs before lower.
        self.assertPathCompare("/z", "/a/a")
        # except if the deeper dir should be output first
        self.assertPathCompare("/a/b/c", "/d/g")
        # lexical betwen dirs of the same height
        self.assertPathCompare("/a/z", "/z/z")
        self.assertPathCompare("/a/c/z", "/a/d/e")

        # this should also be consistent for no leading / paths
        # root before all else
        self.assertPathCompare("", "a")
        # alpha within a dir
        self.assertPathCompare("a", "b")
        self.assertPathCompare("b", "z")
        # high dirs before lower.
        self.assertPathCompare("z", "a/a")
        # except if the deeper dir should be output first
        self.assertPathCompare("a/b/c", "d/g")
        # lexical betwen dirs of the same height
        self.assertPathCompare("a/z", "z/z")
        self.assertPathCompare("a/c/z", "a/d/e")

    def test_path_prefix_sorting(self):
        """Doing a sort on path prefix should match our sample data."""
        original_paths = [
            'a',
            'a/b',
            'a/b/c',
            'b',
            'b/c',
            'd',
            'd/e',
            'd/e/f',
            'd/f',
            'd/g',
            'g',
            ]

        dir_sorted_paths = [
            'a',
            'b',
            'd',
            'g',
            'a/b',
            'a/b/c',
            'b/c',
            'd/e',
            'd/f',
            'd/g',
            'd/e/f',
            ]

        self.assertEqual(
            dir_sorted_paths,
            sorted(original_paths, key=osutils.path_prefix_key))
        # using the comparison routine shoudl work too:
        self.assertEqual(
            dir_sorted_paths,
            sorted(original_paths, cmp=osutils.compare_paths_prefix_order))


class TestCopyTree(tests.TestCaseInTempDir):

    def test_copy_basic_tree(self):
        self.build_tree(['source/', 'source/a', 'source/b/', 'source/b/c'])
        osutils.copy_tree('source', 'target')
        self.assertEqual(['a', 'b'], sorted(os.listdir('target')))
        self.assertEqual(['c'], os.listdir('target/b'))

    def test_copy_tree_target_exists(self):
        self.build_tree(['source/', 'source/a', 'source/b/', 'source/b/c',
                         'target/'])
        osutils.copy_tree('source', 'target')
        self.assertEqual(['a', 'b'], sorted(os.listdir('target')))
        self.assertEqual(['c'], os.listdir('target/b'))

    def test_copy_tree_symlinks(self):
        self.requireFeature(tests.SymlinkFeature)
        self.build_tree(['source/'])
        os.symlink('a/generic/path', 'source/lnk')
        osutils.copy_tree('source', 'target')
        self.assertEqual(['lnk'], os.listdir('target'))
        self.assertEqual('a/generic/path', os.readlink('target/lnk'))

    def test_copy_tree_handlers(self):
        processed_files = []
        processed_links = []
        def file_handler(from_path, to_path):
            processed_files.append(('f', from_path, to_path))
        def dir_handler(from_path, to_path):
            processed_files.append(('d', from_path, to_path))
        def link_handler(from_path, to_path):
            processed_links.append((from_path, to_path))
        handlers = {'file':file_handler,
                    'directory':dir_handler,
                    'symlink':link_handler,
                   }

        self.build_tree(['source/', 'source/a', 'source/b/', 'source/b/c'])
        if osutils.has_symlinks():
            os.symlink('a/generic/path', 'source/lnk')
        osutils.copy_tree('source', 'target', handlers=handlers)

        self.assertEqual([('d', 'source', 'target'),
                          ('f', 'source/a', 'target/a'),
                          ('d', 'source/b', 'target/b'),
                          ('f', 'source/b/c', 'target/b/c'),
                         ], processed_files)
        self.failIfExists('target')
        if osutils.has_symlinks():
            self.assertEqual([('source/lnk', 'target/lnk')], processed_links)


class TestSetUnsetEnv(tests.TestCase):
    """Test updating the environment"""

    def setUp(self):
        super(TestSetUnsetEnv, self).setUp()

        self.assertEqual(None, os.environ.get('BZR_TEST_ENV_VAR'),
                         'Environment was not cleaned up properly.'
                         ' Variable BZR_TEST_ENV_VAR should not exist.')
        def cleanup():
            if 'BZR_TEST_ENV_VAR' in os.environ:
                del os.environ['BZR_TEST_ENV_VAR']

        self.addCleanup(cleanup)

    def test_set(self):
        """Test that we can set an env variable"""
        old = osutils.set_or_unset_env('BZR_TEST_ENV_VAR', 'foo')
        self.assertEqual(None, old)
        self.assertEqual('foo', os.environ.get('BZR_TEST_ENV_VAR'))

    def test_double_set(self):
        """Test that we get the old value out"""
        osutils.set_or_unset_env('BZR_TEST_ENV_VAR', 'foo')
        old = osutils.set_or_unset_env('BZR_TEST_ENV_VAR', 'bar')
        self.assertEqual('foo', old)
        self.assertEqual('bar', os.environ.get('BZR_TEST_ENV_VAR'))

    def test_unicode(self):
        """Environment can only contain plain strings

        So Unicode strings must be encoded.
        """
        uni_val, env_val = tests.probe_unicode_in_user_encoding()
        if uni_val is None:
            raise tests.TestSkipped(
                'Cannot find a unicode character that works in encoding %s'
                % (osutils.get_user_encoding(),))

        old = osutils.set_or_unset_env('BZR_TEST_ENV_VAR', uni_val)
        self.assertEqual(env_val, os.environ.get('BZR_TEST_ENV_VAR'))

    def test_unset(self):
        """Test that passing None will remove the env var"""
        osutils.set_or_unset_env('BZR_TEST_ENV_VAR', 'foo')
        old = osutils.set_or_unset_env('BZR_TEST_ENV_VAR', None)
        self.assertEqual('foo', old)
        self.assertEqual(None, os.environ.get('BZR_TEST_ENV_VAR'))
        self.failIf('BZR_TEST_ENV_VAR' in os.environ)


class TestSizeShaFile(tests.TestCaseInTempDir):

    def test_sha_empty(self):
        self.build_tree_contents([('foo', '')])
        expected_sha = osutils.sha_string('')
        f = open('foo')
        self.addCleanup(f.close)
        size, sha = osutils.size_sha_file(f)
        self.assertEqual(0, size)
        self.assertEqual(expected_sha, sha)

    def test_sha_mixed_endings(self):
        text = 'test\r\nwith\nall\rpossible line endings\r\n'
        self.build_tree_contents([('foo', text)])
        expected_sha = osutils.sha_string(text)
        f = open('foo', 'rb')
        self.addCleanup(f.close)
        size, sha = osutils.size_sha_file(f)
        self.assertEqual(38, size)
        self.assertEqual(expected_sha, sha)


class TestShaFileByName(tests.TestCaseInTempDir):

    def test_sha_empty(self):
        self.build_tree_contents([('foo', '')])
        expected_sha = osutils.sha_string('')
        self.assertEqual(expected_sha, osutils.sha_file_by_name('foo'))

    def test_sha_mixed_endings(self):
        text = 'test\r\nwith\nall\rpossible line endings\r\n'
        self.build_tree_contents([('foo', text)])
        expected_sha = osutils.sha_string(text)
        self.assertEqual(expected_sha, osutils.sha_file_by_name('foo'))


class TestResourceLoading(tests.TestCaseInTempDir):

    def test_resource_string(self):
        # test resource in bzrlib
        text = osutils.resource_string('bzrlib', 'debug.py')
        self.assertContainsRe(text, "debug_flags = set()")
        # test resource under bzrlib
        text = osutils.resource_string('bzrlib.ui', 'text.py')
        self.assertContainsRe(text, "class TextUIFactory")
        # test unsupported package
        self.assertRaises(errors.BzrError, osutils.resource_string, 'zzzz',
            'yyy.xx')
        # test unknown resource
        self.assertRaises(IOError, osutils.resource_string, 'bzrlib', 'yyy.xx')


class TestReCompile(tests.TestCase):

    def test_re_compile_checked(self):
        r = osutils.re_compile_checked(r'A*', re.IGNORECASE)
        self.assertTrue(r.match('aaaa'))
        self.assertTrue(r.match('aAaA'))

    def test_re_compile_checked_error(self):
        # like https://bugs.launchpad.net/bzr/+bug/251352
        err = self.assertRaises(
            errors.BzrCommandError,
            osutils.re_compile_checked, '*', re.IGNORECASE, 'test case')
        self.assertEqual(
            "Invalid regular expression in test case: '*': "
            "nothing to repeat",
            str(err))


class TestDirReader(tests.TestCaseInTempDir):

    # Set by load_tests
    _dir_reader_class = None
    _native_to_unicode = None

    def setUp(self):
        tests.TestCaseInTempDir.setUp(self)

        # Save platform specific info and reset it
        cur_dir_reader = osutils._selected_dir_reader

        def restore():
            osutils._selected_dir_reader = cur_dir_reader
        self.addCleanup(restore)

        osutils._selected_dir_reader = self._dir_reader_class()

    def _get_ascii_tree(self):
        tree = [
            '0file',
            '1dir/',
            '1dir/0file',
            '1dir/1dir/',
            '2file'
            ]
        expected_dirblocks = [
                (('', '.'),
                 [('0file', '0file', 'file'),
                  ('1dir', '1dir', 'directory'),
                  ('2file', '2file', 'file'),
                 ]
                ),
                (('1dir', './1dir'),
                 [('1dir/0file', '0file', 'file'),
                  ('1dir/1dir', '1dir', 'directory'),
                 ]
                ),
                (('1dir/1dir', './1dir/1dir'),
                 [
                 ]
                ),
            ]
        return tree, expected_dirblocks

    def test_walk_cur_dir(self):
        tree, expected_dirblocks = self._get_ascii_tree()
        self.build_tree(tree)
        result = list(osutils._walkdirs_utf8('.'))
        # Filter out stat and abspath
        self.assertEqual(expected_dirblocks,
                         [(dirinfo, [line[0:3] for line in block])
                          for dirinfo, block in result])

    def test_walk_sub_dir(self):
        tree, expected_dirblocks = self._get_ascii_tree()
        self.build_tree(tree)
        # you can search a subdir only, with a supplied prefix.
        result = list(osutils._walkdirs_utf8('./1dir', '1dir'))
        # Filter out stat and abspath
        self.assertEqual(expected_dirblocks[1:],
                         [(dirinfo, [line[0:3] for line in block])
                          for dirinfo, block in result])

    def _get_unicode_tree(self):
        name0u = u'0file-\xb6'
        name1u = u'1dir-\u062c\u0648'
        name2u = u'2file-\u0633'
        tree = [
            name0u,
            name1u + '/',
            name1u + '/' + name0u,
            name1u + '/' + name1u + '/',
            name2u,
            ]
        name0 = name0u.encode('UTF-8')
        name1 = name1u.encode('UTF-8')
        name2 = name2u.encode('UTF-8')
        expected_dirblocks = [
                (('', '.'),
                 [(name0, name0, 'file', './' + name0u),
                  (name1, name1, 'directory', './' + name1u),
                  (name2, name2, 'file', './' + name2u),
                 ]
                ),
                ((name1, './' + name1u),
                 [(name1 + '/' + name0, name0, 'file', './' + name1u
                                                        + '/' + name0u),
                  (name1 + '/' + name1, name1, 'directory', './' + name1u
                                                            + '/' + name1u),
                 ]
                ),
                ((name1 + '/' + name1, './' + name1u + '/' + name1u),
                 [
                 ]
                ),
            ]
        return tree, expected_dirblocks

    def _filter_out(self, raw_dirblocks):
        """Filter out a walkdirs_utf8 result.

        stat field is removed, all native paths are converted to unicode
        """
        filtered_dirblocks = []
        for dirinfo, block in raw_dirblocks:
            dirinfo = (dirinfo[0], self._native_to_unicode(dirinfo[1]))
            details = []
            for line in block:
                details.append(line[0:3] + (self._native_to_unicode(line[4]), ))
            filtered_dirblocks.append((dirinfo, details))
        return filtered_dirblocks

    def test_walk_unicode_tree(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        tree, expected_dirblocks = self._get_unicode_tree()
        self.build_tree(tree)
        result = list(osutils._walkdirs_utf8('.'))
        self.assertEqual(expected_dirblocks, self._filter_out(result))

    def test_symlink(self):
        self.requireFeature(tests.SymlinkFeature)
        self.requireFeature(tests.UnicodeFilenameFeature)
        target = u'target\N{Euro Sign}'
        link_name = u'l\N{Euro Sign}nk'
        os.symlink(target, link_name)
        target_utf8 = target.encode('UTF-8')
        link_name_utf8 = link_name.encode('UTF-8')
        expected_dirblocks = [
                (('', '.'),
                 [(link_name_utf8, link_name_utf8,
                   'symlink', './' + link_name),],
                 )]
        result = list(osutils._walkdirs_utf8('.'))
        self.assertEqual(expected_dirblocks, self._filter_out(result))


class TestReadLink(tests.TestCaseInTempDir):
    """Exposes os.readlink() problems and the osutils solution.

    The only guarantee offered by os.readlink(), starting with 2.6, is that a
    unicode string will be returned if a unicode string is passed.

    But prior python versions failed to properly encode the passed unicode
    string.
    """
    _test_needs_features = [tests.SymlinkFeature, tests.UnicodeFilenameFeature]

    def setUp(self):
        super(tests.TestCaseInTempDir, self).setUp()
        self.link = u'l\N{Euro Sign}ink'
        self.target = u'targe\N{Euro Sign}t'
        os.symlink(self.target, self.link)

    def test_os_readlink_link_encoding(self):
        if sys.version_info < (2, 6):
            self.assertRaises(UnicodeEncodeError, os.readlink, self.link)
        else:
            self.assertEquals(self.target,  os.readlink(self.link))

    def test_os_readlink_link_decoding(self):
        self.assertEquals(self.target.encode(osutils._fs_enc),
                          os.readlink(self.link.encode(osutils._fs_enc)))


class TestConcurrency(tests.TestCase):

    def setUp(self):
        super(TestConcurrency, self).setUp()
        orig = osutils._cached_local_concurrency
        def restore():
            osutils._cached_local_concurrency = orig
        self.addCleanup(restore)

    def test_local_concurrency(self):
        concurrency = osutils.local_concurrency()
        self.assertIsInstance(concurrency, int)

    def test_local_concurrency_environment_variable(self):
        os.environ['BZR_CONCURRENCY'] = '2'
        self.assertEqual(2, osutils.local_concurrency(use_cache=False))
        os.environ['BZR_CONCURRENCY'] = '3'
        self.assertEqual(3, osutils.local_concurrency(use_cache=False))
        os.environ['BZR_CONCURRENCY'] = 'foo'
        self.assertEqual(1, osutils.local_concurrency(use_cache=False))

    def test_option_concurrency(self):
        os.environ['BZR_CONCURRENCY'] = '1'
        self.run_bzr('rocks --concurrency 42')
        # Command line overrides envrionment variable
        self.assertEquals('42', os.environ['BZR_CONCURRENCY'])
        self.assertEquals(42, osutils.local_concurrency(use_cache=False))


class TestFailedToLoadExtension(tests.TestCase):

    def _try_loading(self):
        try:
            import bzrlib._fictional_extension_py
        except ImportError, e:
            osutils.failed_to_load_extension(e)
            return True

    def setUp(self):
        super(TestFailedToLoadExtension, self).setUp()
        self.saved_failures = osutils._extension_load_failures[:]
        del osutils._extension_load_failures[:]
        self.addCleanup(self.restore_failures)

    def restore_failures(self):
        osutils._extension_load_failures = self.saved_failures

    def test_failure_to_load(self):
        self._try_loading()
        self.assertLength(1, osutils._extension_load_failures)
        self.assertEquals(osutils._extension_load_failures[0],
            "No module named _fictional_extension_py")

    def test_report_extension_load_failures_no_warning(self):
        self.assertTrue(self._try_loading())
        warnings, result = self.callCatchWarnings(osutils.report_extension_load_failures)
        # it used to give a Python warning; it no longer does
        self.assertLength(0, warnings)

    def test_report_extension_load_failures_message(self):
        log = StringIO()
        trace.push_log_file(log)
        self.assertTrue(self._try_loading())
        osutils.report_extension_load_failures()
        self.assertContainsRe(
            log.getvalue(),
            r"bzr: warning: some compiled extensions could not be loaded; "
            "see <https://answers\.launchpad\.net/bzr/\+faq/703>\n"
            )


class TestTerminalWidth(tests.TestCase):

    def setUp(self):
        tests.TestCase.setUp(self)
        self._orig_terminal_size_state = osutils._terminal_size_state
        self._orig_first_terminal_size = osutils._first_terminal_size
        self.addCleanup(self.restore_osutils_globals)
        osutils._terminal_size_state = 'no_data'
        osutils._first_terminal_size = None

    def restore_osutils_globals(self):
        osutils._terminal_size_state = self._orig_terminal_size_state
        osutils._first_terminal_size = self._orig_first_terminal_size
        
    def replace_stdout(self, new):
        orig_stdout = sys.stdout
        def restore():
            sys.stdout = orig_stdout
        self.addCleanup(restore)
        sys.stdout = new

    def replace__terminal_size(self, new):
        orig__terminal_size = osutils._terminal_size
        def restore():
            osutils._terminal_size = orig__terminal_size
        self.addCleanup(restore)
        osutils._terminal_size = new

    def set_fake_tty(self):

        class I_am_a_tty(object):
            def isatty(self):
                return True

        self.replace_stdout(I_am_a_tty())

    def test_default_values(self):
        self.assertEqual(80, osutils.default_terminal_width)

    def test_defaults_to_BZR_COLUMNS(self):
        # BZR_COLUMNS is set by the test framework
        self.assertNotEqual('12', os.environ['BZR_COLUMNS'])
        os.environ['BZR_COLUMNS'] = '12'
        self.assertEqual(12, osutils.terminal_width())

    def test_falls_back_to_COLUMNS(self):
        del os.environ['BZR_COLUMNS']
        self.assertNotEqual('42', os.environ['COLUMNS'])
        self.set_fake_tty()
        os.environ['COLUMNS'] = '42'
        self.assertEqual(42, osutils.terminal_width())

    def test_tty_default_without_columns(self):
        del os.environ['BZR_COLUMNS']
        del os.environ['COLUMNS']

        def terminal_size(w, h):
            return 42, 42

        self.set_fake_tty()
        # We need to override the osutils definition as it depends on the
        # running environment that we can't control (PQM running without a
        # controlling terminal is one example).
        self.replace__terminal_size(terminal_size)
        self.assertEqual(42, osutils.terminal_width())

    def test_non_tty_default_without_columns(self):
        del os.environ['BZR_COLUMNS']
        del os.environ['COLUMNS']
        self.replace_stdout(None)
        self.assertEqual(None, osutils.terminal_width())

    def test_no_TIOCGWINSZ(self):
        self.requireFeature(term_ios_feature)
        termios = term_ios_feature.module
        # bug 63539 is about a termios without TIOCGWINSZ attribute
        try:
            orig = termios.TIOCGWINSZ
        except AttributeError:
            # We won't remove TIOCGWINSZ, because it doesn't exist anyway :)
            pass
        else:
            def restore():
                termios.TIOCGWINSZ = orig
            self.addCleanup(restore)
            del termios.TIOCGWINSZ
        del os.environ['BZR_COLUMNS']
        del os.environ['COLUMNS']
        # Whatever the result is, if we don't raise an exception, it's ok.
        osutils.terminal_width()

4763.2.4 by John Arbash Meinel merge bzr.2.1 in preparation for NEWS entry.	1	# Copyright (C) 2005-2010 Canonical Ltd
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	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
4183.7.1 by Sabin Iacob update FSF mailing address	15	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	16
1685.1.45 by John Arbash Meinel Moved url functions into bzrlib.urlutils	17	"""Tests for the osutils wrapper."""
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	18
3504.4.12 by John Arbash Meinel A couple small cleanups, make test_osutils more correct	19	from cStringIO import StringIO
1732.1.28 by John Arbash Meinel Add tests for fancy file types.	20	import errno
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	21	import os
4183.6.4 by Martin Pool Separate out re_compile_checked	22	import re
1732.1.28 by John Arbash Meinel Add tests for fancy file types.	23	import socket
	24	import stat
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	25	import sys
3504.4.2 by John Arbash Meinel Add a test case that shows the mtime is not being returned correctly.	26	import time
1185.31.47 by John Arbash Meinel Added a fancy footwork rename to osutils, made SftpTransport use it.	27
1996.3.14 by John Arbash Meinel lazy_import osutils and sign_my_commits	28	from bzrlib import (
	29	errors,
	30	osutils,
3504.4.1 by John Arbash Meinel Write an alternative 'walkdirs' implementation that uses win32 apis.	31	tests,
4695.4.1 by Martin Pool Give a shorter/cleaner message for missing extensions	32	trace,
2279.4.1 by Alexander Belchenko Reimplementation of ntpath.abspath in Python for Windows98: unicode safe, UNC path safe	33	win32utils,
1996.3.14 by John Arbash Meinel lazy_import osutils and sign_my_commits	34	)
4241.14.4 by Vincent Ladeuil Clean up test_osutils.py.	35	from bzrlib.tests import (
4797.70.1 by Vincent Ladeuil Skip chmodbits dependent tests when running as root	36	features,
4241.14.4 by Vincent Ladeuil Clean up test_osutils.py.	37	file_utils,
	38	test__walkdirs_win32,
	39	)
4297.1.1 by Vincent Ladeuil Trivial cleanups.	40