14
14
# along with this program; if not, write to the Free Software
15
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
from __future__ import absolute_import
20
from stat import S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE
25
from bzrlib.lazy_import import lazy_import
27
from .lazy_import import lazy_import
26
28
lazy_import(globals(), """
27
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from datetime import datetime
29
from ntpath import (abspath as _nt_abspath,
31
normpath as _nt_normpath,
32
realpath as _nt_realpath,
33
splitdrive as _nt_splitdrive,
35
# We need to import both shutil and rmtree as we export the later on posix
36
# and need the former on windows
38
from shutil import rmtree
41
# We need to import both tempfile and mkdtemp as we export the later on posix
42
# and need the former on windows
43
from tempfile import (
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from tempfile import mkdtemp
52
from breezy.i18n import gettext
56
from bzrlib.symbol_versioning import (
61
# sha and md5 modules are deprecated in python2.6 but hashlib is available as
63
if sys.version_info < (2, 5):
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import md5 as _mod_md5
66
import sha as _mod_sha
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from bzrlib import symbol_versioning
79
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# Cross platform wall-clock time functionality with decent resolution.
96
90
O_NOINHERIT = getattr(os, 'O_NOINHERIT', 0)
93
class UnsupportedTimezoneFormat(errors.BzrError):
95
_fmt = ('Unsupported timezone format "%(timezone)s", '
96
'options are "utc", "original", "local".')
98
def __init__(self, timezone):
99
self.timezone = timezone
99
102
def get_unicode_argv():
101
106
user_encoding = get_user_encoding()
102
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return [a.decode(user_encoding) for a in sys.argv[1:]]
103
108
except UnicodeDecodeError:
104
raise errors.BzrError(("Parameter '%r' is unsupported by the current "
109
raise errors.BzrError(gettext("Parameter {0!r} encoding is unsupported by {1} "
110
"application locale.").format(a, user_encoding))
108
113
def make_readonly(filename):
109
114
"""Make a filename read-only."""
110
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mod = os.lstat(filename).st_mode
111
116
if not stat.S_ISLNK(mod):
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os.chmod(filename, mod)
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chmod_if_possible(filename, mod)
116
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def make_writable(filename):
117
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mod = os.lstat(filename).st_mode
118
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if not stat.S_ISLNK(mod):
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os.chmod(filename, mod)
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chmod_if_possible(filename, mod)
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def chmod_if_possible(filename, mode):
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# Set file mode if that can be safely done.
130
# Sometimes even on unix the filesystem won't allow it - see
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# https://bugs.launchpad.net/bzr/+bug/606537
133
# It is probably faster to just do the chmod, rather than
134
# doing a stat, and then trying to compare
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os.chmod(filename, mode)
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except (IOError, OSError) as e:
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# Permission/access denied seems to commonly happen on smbfs; there's
138
# probably no point warning about it.
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# <https://bugs.launchpad.net/bzr/+bug/606537>
140
if getattr(e, 'errno') in (errno.EPERM, errno.EACCES):
141
trace.mutter("ignore error on chmod of %r: %r" % (
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def minimum_path_selection(paths):
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file_existed = False
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rename_func(new, tmp_name)
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except (errors.NoSuchFile,), e:
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except (errors.NoSuchFile,):
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# RBC 20060103 abstraction leakage: the paramiko SFTP clients rename
239
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# function raises an IOError with errno is None when a rename fails.
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# This then gets caught here.
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if e.errno not in (None, errno.ENOENT, errno.ENOTDIR):
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except Exception as e:
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if (getattr(e, 'errno', None) is None
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or e.errno not in (errno.ENOENT, errno.ENOTDIR)):
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or e.errno not in (errno.ENOENT, errno.ENOTDIR)):
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file_existed = True
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# This may throw an exception, in which case success will
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rename_func(old, new)
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except (IOError, OSError), e:
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# source and target may be aliases of each other (e.g. on a
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# case-insensitive filesystem), so we may have accidentally renamed
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# source by when we tried to rename target
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failure_exc = sys.exc_info()
263
if (file_existed and e.errno in (None, errno.ENOENT)
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# This may throw an exception, in which case success will
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rename_func(old, new)
285
except (IOError, OSError) as e:
286
# source and target may be aliases of each other (e.g. on a
287
# case-insensitive filesystem), so we may have accidentally renamed
288
# source by when we tried to rename target
289
if (file_existed and e.errno in (None, errno.ENOENT)
264
290
and old.lower() == new.lower()):
265
# source and target are the same file on a case-insensitive
266
# filesystem, so we don't generate an exception
291
# source and target are the same file on a case-insensitive
292
# filesystem, so we don't generate an exception
270
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# If the file used to exist, rename it back into place
273
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unlink_func(tmp_name)
275
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rename_func(tmp_name, new)
276
if failure_exc is not None:
277
raise failure_exc[0], failure_exc[1], failure_exc[2]
280
306
# In Python 2.4.2 and older, os.path.abspath and os.path.realpath
281
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# choke on a Unicode string containing a relative path if
282
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# os.getcwd() returns a non-sys.getdefaultencoding()-encoded
284
_fs_enc = sys.getfilesystemencoding() or 'utf-8'
285
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def _posix_abspath(path):
286
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# jam 20060426 rather than encoding to fsencoding
287
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# copy posixpath.abspath, but use os.getcwdu instead
288
313
if not posixpath.isabs(path):
289
314
path = posixpath.join(getcwd(), path)
290
return posixpath.normpath(path)
315
return _posix_normpath(path)
293
318
def _posix_realpath(path):
294
319
return posixpath.realpath(path.encode(_fs_enc)).decode(_fs_enc)
322
def _posix_normpath(path):
323
path = posixpath.normpath(path)
324
# Bug 861008: posixpath.normpath() returns a path normalized according to
325
# the POSIX standard, which stipulates (for compatibility reasons) that two
326
# leading slashes must not be simplified to one, and only if there are 3 or
327
# more should they be simplified as one. So we treat the leading 2 slashes
328
# as a special case here by simply removing the first slash, as we consider
329
# that breaking POSIX compatibility for this obscure feature is acceptable.
330
# This is not a paranoid precaution, as we notably get paths like this when
331
# the repo is hosted at the root of the filesystem, i.e. in "/".
332
if path.startswith('//'):
337
def _posix_path_from_environ(key):
338
"""Get unicode path from `key` in environment or None if not present
340
Note that posix systems use arbitrary byte strings for filesystem objects,
341
so a path that raises BadFilenameEncoding here may still be accessible.
343
val = os.environ.get(key, None)
344
if PY3 or val is None:
347
return val.decode(_fs_enc)
348
except UnicodeDecodeError:
349
# GZ 2011-12-12:Ideally want to include `key` in the exception message
350
raise errors.BadFilenameEncoding(val, _fs_enc)
353
def _posix_get_home_dir():
354
"""Get the home directory of the current user as a unicode path"""
355
path = posixpath.expanduser("~")
357
return path.decode(_fs_enc)
358
except AttributeError:
360
except UnicodeDecodeError:
361
raise errors.BadFilenameEncoding(path, _fs_enc)
364
def _posix_getuser_unicode():
365
"""Get username from environment or password database as unicode"""
366
name = getpass.getuser()
369
user_encoding = get_user_encoding()
371
return name.decode(user_encoding)
372
except UnicodeDecodeError:
373
raise errors.BzrError("Encoding of username %r is unsupported by %s "
374
"application locale." % (name, user_encoding))
297
377
def _win32_fixdrive(path):
298
378
"""Force drive letters to be consistent.
303
383
running python.exe under cmd.exe return capital C:\\
304
384
running win32 python inside a cygwin shell returns lowercase c:\\
306
drive, path = _nt_splitdrive(path)
386
drive, path = ntpath.splitdrive(path)
307
387
return drive.upper() + path
310
390
def _win32_abspath(path):
311
# Real _nt_abspath doesn't have a problem with a unicode cwd
312
return _win32_fixdrive(_nt_abspath(unicode(path)).replace('\\', '/'))
315
def _win98_abspath(path):
316
"""Return the absolute version of a path.
317
Windows 98 safe implementation (python reimplementation
318
of Win32 API function GetFullPathNameW)
323
# \\HOST\path => //HOST/path
324
# //HOST/path => //HOST/path
325
# path => C:/cwd/path
328
# check for absolute path
329
drive = _nt_splitdrive(path)[0]
330
if drive == '' and path[:2] not in('//','\\\\'):
332
# we cannot simply os.path.join cwd and path
333
# because os.path.join('C:','/path') produce '/path'
334
# and this is incorrect
335
if path[:1] in ('/','\\'):
336
cwd = _nt_splitdrive(cwd)[0]
338
path = cwd + '\\' + path
339
return _win32_fixdrive(_nt_normpath(path).replace('\\', '/'))
391
# Real ntpath.abspath doesn't have a problem with a unicode cwd
392
return _win32_fixdrive(ntpath.abspath(path).replace('\\', '/'))
342
395
def _win32_realpath(path):
343
# Real _nt_realpath doesn't have a problem with a unicode cwd
344
return _win32_fixdrive(_nt_realpath(unicode(path)).replace('\\', '/'))
396
# Real ntpath.realpath doesn't have a problem with a unicode cwd
397
return _win32_fixdrive(ntpath.realpath(path).replace('\\', '/'))
347
400
def _win32_pathjoin(*args):
348
return _nt_join(*args).replace('\\', '/')
401
return ntpath.join(*args).replace('\\', '/')
351
404
def _win32_normpath(path):
352
return _win32_fixdrive(_nt_normpath(unicode(path)).replace('\\', '/'))
405
return _win32_fixdrive(ntpath.normpath(path).replace('\\', '/'))
355
408
def _win32_getcwd():
356
return _win32_fixdrive(os.getcwdu().replace('\\', '/'))
409
return _win32_fixdrive(_getcwd().replace('\\', '/'))
359
412
def _win32_mkdtemp(*args, **kwargs):
360
413
return _win32_fixdrive(tempfile.mkdtemp(*args, **kwargs).replace('\\', '/'))
363
def _add_rename_error_details(e, old, new):
364
new_e = OSError(e.errno, "failed to rename %s to %s: %s"
365
% (old, new, e.strerror))
367
new_e.to_filename = new
371
416
def _win32_rename(old, new):
372
417
"""We expect to be able to atomically replace 'new' with old.
389
def _wrapped_rename(old, new):
390
"""Rename a file or directory"""
393
except (IOError, OSError), e:
394
# this is eventually called by all rename-like functions, so should
396
raise _add_rename_error_details(e, old, new)
399
434
def _mac_getcwd():
400
return unicodedata.normalize('NFC', os.getcwdu())
435
return unicodedata.normalize('NFC', _getcwd())
438
def _rename_wrap_exception(rename_func):
439
"""Adds extra information to any exceptions that come from rename().
441
The exception has an updated message and 'old_filename' and 'new_filename'
445
def _rename_wrapper(old, new):
447
rename_func(old, new)
449
detailed_error = OSError(e.errno, e.strerror +
450
" [occurred when renaming '%s' to '%s']" %
452
detailed_error.old_filename = old
453
detailed_error.new_filename = new
456
return _rename_wrapper
459
if sys.version_info > (3,):
465
# Default rename wraps os.rename()
466
rename = _rename_wrap_exception(os.rename)
403
468
# Default is to just use the python builtins, but these can be rebound on
404
469
# particular platforms.
405
470
abspath = _posix_abspath
406
471
realpath = _posix_realpath
407
472
pathjoin = os.path.join
408
normpath = os.path.normpath
409
rename = _wrapped_rename # overridden below on win32
473
normpath = _posix_normpath
474
path_from_environ = _posix_path_from_environ
475
_get_home_dir = _posix_get_home_dir
476
getuser_unicode = _posix_getuser_unicode
411
478
dirname = os.path.dirname
412
479
basename = os.path.basename
413
480
split = os.path.split
414
481
splitext = os.path.splitext
415
# These were already imported into local scope
482
# These were already lazily imported into local scope
416
483
# mkdtemp = tempfile.mkdtemp
417
484
# rmtree = shutil.rmtree
419
493
MIN_ABS_PATHLENGTH = 1
422
496
if sys.platform == 'win32':
423
if win32utils.winver == 'Windows 98':
424
abspath = _win98_abspath
426
abspath = _win32_abspath
497
abspath = _win32_abspath
427
498
realpath = _win32_realpath
428
499
pathjoin = _win32_pathjoin
429
500
normpath = _win32_normpath
430
501
getcwd = _win32_getcwd
431
502
mkdtemp = _win32_mkdtemp
432
rename = _win32_rename
503
rename = _rename_wrap_exception(_win32_rename)
505
from . import _walkdirs_win32
509
lstat = _walkdirs_win32.lstat
510
fstat = _walkdirs_win32.fstat
511
wrap_stat = _walkdirs_win32.wrap_stat
434
513
MIN_ABS_PATHLENGTH = 3
471
553
On my standard US Windows XP, the preferred encoding is
472
554
cp1252, but the console is cp437
556
:param trace: If True trace the selected encoding via mutter().
474
from bzrlib.trace import mutter
558
from .trace import mutter
475
559
output_encoding = getattr(sys.stdout, 'encoding', None)
476
560
if not output_encoding:
477
561
input_encoding = getattr(sys.stdin, 'encoding', None)
478
562
if not input_encoding:
479
563
output_encoding = get_user_encoding()
480
mutter('encoding stdout as osutils.get_user_encoding() %r',
565
mutter('encoding stdout as osutils.get_user_encoding() %r',
483
568
output_encoding = input_encoding
484
mutter('encoding stdout as sys.stdin encoding %r', output_encoding)
570
mutter('encoding stdout as sys.stdin encoding %r',
486
mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
574
mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
487
575
if output_encoding == 'cp0':
488
576
# invalid encoding (cp0 means 'no codepage' on Windows)
489
577
output_encoding = get_user_encoding()
490
mutter('cp0 is invalid encoding.'
491
' encoding stdout as osutils.get_user_encoding() %r',
579
mutter('cp0 is invalid encoding.'
580
' encoding stdout as osutils.get_user_encoding() %r',
495
584
codecs.lookup(output_encoding)
496
585
except LookupError:
497
sys.stderr.write('bzr: warning:'
586
sys.stderr.write('brz: warning:'
498
587
' unknown terminal encoding %s.\n'
499
588
' Using encoding %s instead.\n'
500
589
% (output_encoding, get_user_encoding())
502
591
output_encoding = get_user_encoding()
504
593
return output_encoding
857
965
plural_seconds = ''
859
967
plural_seconds = 's'
860
if minutes < 90: # print minutes, seconds up to 90 minutes
968
if minutes < 90: # print minutes, seconds up to 90 minutes
862
970
return '%d minute, %d second%s %s' % (
863
minutes, seconds, plural_seconds, direction)
971
minutes, seconds, plural_seconds, direction)
865
973
return '%d minutes, %d second%s %s' % (
866
minutes, seconds, plural_seconds, direction)
974
minutes, seconds, plural_seconds, direction)
868
976
hours = int(minutes / 60)
869
977
minutes -= 60 * hours
878
986
return '%d hours, %d minute%s %s' % (hours, minutes,
879
987
plural_minutes, direction)
882
991
"""Return size of given open file."""
883
return os.fstat(f.fileno())[ST_SIZE]
886
# Define rand_bytes based on platform.
888
# Python 2.4 and later have os.urandom,
889
# but it doesn't work on some arches
891
rand_bytes = os.urandom
892
except (NotImplementedError, AttributeError):
893
# If python doesn't have os.urandom, or it doesn't work,
894
# then try to first pull random data from /dev/urandom
992
return os.fstat(f.fileno())[stat.ST_SIZE]
995
# Alias os.urandom to support platforms (which?) without /dev/urandom and
996
# override if it doesn't work. Avoid checking on windows where there is
997
# significant initialisation cost that can be avoided for some bzr calls.
999
rand_bytes = os.urandom
1001
if rand_bytes.__module__ != "nt":
896
rand_bytes = file('/dev/urandom', 'rb').read
897
# Otherwise, use this hack as a last resort
898
except (IOError, OSError):
1004
except NotImplementedError:
899
1005
# not well seeded, but better than nothing
900
1006
def rand_bytes(n):
917
1025
for raw_byte in rand_bytes(num):
918
s += ALNUM[ord(raw_byte) % 36]
1027
s += ALNUM[ord(raw_byte) % 36]
1029
s += ALNUM[raw_byte % 36]
922
## TODO: We could later have path objects that remember their list
923
## decomposition (might be too tricksy though.)
1033
# TODO: We could later have path objects that remember their list
1034
# decomposition (might be too tricksy though.)
925
1036
def splitpath(p):
926
1037
"""Turn string into list of parts."""
927
# split on either delimiter because people might use either on
929
ps = re.split(r'[\\/]', p)
1038
if os.path.sep == '\\':
1039
# split on either delimiter because people might use either on
1041
if isinstance(p, bytes):
1042
ps = re.split(b'[\\\\/]', p)
1044
ps = re.split(r'[\\/]', p)
1046
if isinstance(p, bytes):
934
raise errors.BzrError("sorry, %r not allowed in path" % f)
935
elif (f == '.') or (f == ''):
1053
if f in ('..', b'..'):
1054
raise errors.BzrError(gettext("sorry, %r not allowed in path") % f)
1055
elif f in ('.', '', b'.', b''):
970
1090
implementation should be loaded instead::
973
>>> import bzrlib._fictional_extension_pyx
1093
>>> import breezy._fictional_extension_pyx
974
1094
>>> except ImportError, e:
975
>>> bzrlib.osutils.failed_to_load_extension(e)
976
>>> import bzrlib._fictional_extension_py
1095
>>> breezy.osutils.failed_to_load_extension(e)
1096
>>> import breezy._fictional_extension_py
978
1098
# NB: This docstring is just an example, not a doctest, because doctest
979
1099
# currently can't cope with the use of lazy imports in this namespace --
982
1102
# This currently doesn't report the failure at the time it occurs, because
983
1103
# they tend to happen very early in startup when we can't check config
984
1104
# files etc, and also we want to report all failures but not spam the user
985
1105
# with 10 warnings.
986
from bzrlib import trace
987
1106
exception_str = str(exception)
988
1107
if exception_str not in _extension_load_failures:
989
1108
trace.mutter("failed to load compiled extension: %s" % exception_str)
993
1112
def report_extension_load_failures():
994
1113
if not _extension_load_failures:
996
from bzrlib.config import GlobalConfig
997
if GlobalConfig().get_user_option_as_bool('ignore_missing_extensions'):
1115
if config.GlobalConfig().suppress_warning('missing_extensions'):
999
1117
# the warnings framework should by default show this only once
1000
from bzrlib.trace import warning
1118
from .trace import warning
1002
"bzr: warning: some compiled extensions could not be loaded; "
1003
"see <https://answers.launchpad.net/bzr/+faq/703>")
1120
"brz: warning: some compiled extensions could not be loaded; "
1121
"see ``brz help missing-extensions``")
1004
1122
# we no longer show the specific missing extensions here, because it makes
1005
1123
# the message too long and scary - see
1006
1124
# https://bugs.launchpad.net/bzr/+bug/430529
1010
from bzrlib._chunks_to_lines_pyx import chunks_to_lines
1011
except ImportError, e:
1128
from ._chunks_to_lines_pyx import chunks_to_lines
1129
except ImportError as e:
1012
1130
failed_to_load_extension(e)
1013
from bzrlib._chunks_to_lines_py import chunks_to_lines
1131
from ._chunks_to_lines_py import chunks_to_lines
1016
1134
def split_lines(s):
1017
1135
"""Split s into lines, but without removing the newline characters."""
1018
1136
# Trivially convert a fulltext into a 'chunked' representation, and let
1019
1137
# chunks_to_lines do the heavy lifting.
1020
if isinstance(s, str):
1138
if isinstance(s, bytes):
1021
1139
# chunks_to_lines only supports 8-bit strings
1022
1140
return chunks_to_lines([s])
1049
1168
os.link(src, dest)
1050
except (OSError, IOError), e:
1169
except (OSError, IOError) as e:
1051
1170
if e.errno != errno.EXDEV:
1053
1172
shutil.copyfile(src, dest)
1056
1175
def delete_any(path):
1057
"""Delete a file, symlink or directory.
1176
"""Delete a file, symlink or directory.
1059
1178
Will delete even if readonly.
1062
_delete_file_or_dir(path)
1063
except (OSError, IOError), e:
1181
_delete_file_or_dir(path)
1182
except (OSError, IOError) as e:
1064
1183
if e.errno in (errno.EPERM, errno.EACCES):
1065
1184
# make writable and try again
1250
1371
# but for now, we haven't optimized...
1251
1372
return [canonical_relpath(base, p) for p in paths]
1375
def decode_filename(filename):
1376
"""Decode the filename using the filesystem encoding
1378
If it is unicode, it is returned.
1379
Otherwise it is decoded from the the filesystem's encoding. If decoding
1380
fails, a errors.BadFilenameEncoding exception is raised.
1382
if isinstance(filename, text_type):
1385
return filename.decode(_fs_enc)
1386
except UnicodeDecodeError:
1387
raise errors.BadFilenameEncoding(filename, _fs_enc)
1253
1390
def safe_unicode(unicode_or_utf8_string):
1254
1391
"""Coerce unicode_or_utf8_string into unicode.
1284
1421
return unicode_or_utf8_string.encode('utf-8')
1287
_revision_id_warning = ('Unicode revision ids were deprecated in bzr 0.15.'
1288
' Revision id generators should be creating utf8'
1292
def safe_revision_id(unicode_or_utf8_string, warn=True):
1424
def safe_revision_id(unicode_or_utf8_string):
1293
1425
"""Revision ids should now be utf8, but at one point they were unicode.
1295
1427
:param unicode_or_utf8_string: A possibly Unicode revision_id. (can also be
1297
:param warn: Functions that are sanitizing user data can set warn=False
1298
1429
:return: None or a utf8 revision id.
1300
1431
if (unicode_or_utf8_string is None
1301
or unicode_or_utf8_string.__class__ == str):
1432
or unicode_or_utf8_string.__class__ == bytes):
1302
1433
return unicode_or_utf8_string
1304
symbol_versioning.warn(_revision_id_warning, DeprecationWarning,
1306
return cache_utf8.encode(unicode_or_utf8_string)
1309
_file_id_warning = ('Unicode file ids were deprecated in bzr 0.15. File id'
1310
' generators should be creating utf8 file ids.')
1313
def safe_file_id(unicode_or_utf8_string, warn=True):
1434
raise TypeError('Unicode revision ids are no longer supported. '
1435
'Revision id generators should be creating utf8 revision '
1439
def safe_file_id(unicode_or_utf8_string):
1314
1440
"""File ids should now be utf8, but at one point they were unicode.
1316
1442
This is the same as safe_utf8, except it uses the cached encode functions
1358
1481
can be accessed by that path.
1361
return unicodedata.normalize('NFC', unicode(path)), True
1484
if isinstance(path, bytes):
1485
path = path.decode(sys.getfilesystemencoding())
1486
return unicodedata.normalize('NFC', path), True
1364
1489
def _inaccessible_normalized_filename(path):
1365
1490
__doc__ = _accessible_normalized_filename.__doc__
1367
normalized = unicodedata.normalize('NFC', unicode(path))
1492
if isinstance(path, bytes):
1493
path = path.decode(sys.getfilesystemencoding())
1494
normalized = unicodedata.normalize('NFC', path)
1368
1495
return normalized, normalized == path
1424
1558
None is returned if the width can't established precisely.
1427
- if BZR_COLUMNS is set, returns its value
1561
- if BRZ_COLUMNS is set, returns its value
1428
1562
- if there is no controlling terminal, returns None
1563
- query the OS, if the queried size has changed since the last query,
1429
1565
- if COLUMNS is set, returns its value,
1566
- if the OS has a value (even though it's never changed), return its value.
1431
1568
From there, we need to query the OS to get the size of the controlling
1571
On Unices we query the OS by:
1435
1572
- get termios.TIOCGWINSZ
1436
1573
- if an error occurs or a negative value is obtained, returns None
1575
On Windows we query the OS by:
1440
1576
- win32utils.get_console_size() decides,
1441
1577
- returns None on error (provided default value)
1579
# Note to implementors: if changing the rules for determining the width,
1580
# make sure you've considered the behaviour in these cases:
1581
# - M-x shell in emacs, where $COLUMNS is set and TIOCGWINSZ returns 0,0.
1582
# - brz log | less, in bash, where $COLUMNS not set and TIOCGWINSZ returns
1584
# - (add more interesting cases here, if you find any)
1585
# Some programs implement "Use $COLUMNS (if set) until SIGWINCH occurs",
1586
# but we don't want to register a signal handler because it is impossible
1587
# to do so without risking EINTR errors in Python <= 2.6.5 (see
1588
# <http://bugs.python.org/issue8354>). Instead we check TIOCGWINSZ every
1589
# time so we can notice if the reported size has changed, which should have
1444
# If BZR_COLUMNS is set, take it, user is always right
1592
# If BRZ_COLUMNS is set, take it, user is always right
1593
# Except if they specified 0 in which case, impose no limit here
1446
return int(os.environ['BZR_COLUMNS'])
1595
width = int(os.environ['BRZ_COLUMNS'])
1447
1596
except (KeyError, ValueError):
1598
if width is not None:
1450
1604
isatty = getattr(sys.stdout, 'isatty', None)
1451
if isatty is None or not isatty():
1452
# Don't guess, setting BZR_COLUMNS is the recommended way to override.
1605
if isatty is None or not isatty():
1606
# Don't guess, setting BRZ_COLUMNS is the recommended way to override.
1455
# If COLUMNS is set, take it, the terminal knows better (even inside a
1456
# given terminal, the application can decide to set COLUMNS to a lower
1457
# value (splitted screen) or a bigger value (scroll bars))
1610
width, height = os_size = _terminal_size(None, None)
1611
global _first_terminal_size, _terminal_size_state
1612
if _terminal_size_state == 'no_data':
1613
_first_terminal_size = os_size
1614
_terminal_size_state = 'unchanged'
1615
elif (_terminal_size_state == 'unchanged' and
1616
_first_terminal_size != os_size):
1617
_terminal_size_state = 'changed'
1619
# If the OS claims to know how wide the terminal is, and this value has
1620
# ever changed, use that.
1621
if _terminal_size_state == 'changed':
1622
if width is not None and width > 0:
1625
# If COLUMNS is set, use it.
1459
1627
return int(os.environ['COLUMNS'])
1460
1628
except (KeyError, ValueError):
1463
width, height = _terminal_size(None, None)
1465
# Consider invalid values as meaning no width
1631
# Finally, use an unchanged size from the OS, if we have one.
1632
if _terminal_size_state == 'unchanged':
1633
if width is not None and width > 0:
1636
# The width could not be determined.
1471
1640
def _win32_terminal_size(width, height):
1472
width, height = win32utils.get_console_size(defaultx=width, defaulty=height)
1641
width, height = win32utils.get_console_size(
1642
defaultx=width, defaulty=height)
1473
1643
return width, height
1476
1646
def _ioctl_terminal_size(width, height):
1478
import struct, fcntl, termios
1479
1651
s = struct.pack('HHHH', 0, 0, 0, 0)
1480
1652
x = fcntl.ioctl(1, termios.TIOCGWINSZ, s)
1481
1653
height, width = struct.unpack('HHHH', x)[0:2]
1498
1671
_terminal_size = _ioctl_terminal_size
1501
def _terminal_size_changed(signum, frame):
1502
"""Set COLUMNS upon receiving a SIGnal for WINdow size CHange."""
1503
width, height = _terminal_size(None, None)
1504
if width is not None:
1505
os.environ['COLUMNS'] = str(width)
1508
_registered_sigwinch = False
1509
def watch_sigwinch():
1510
"""Register for SIGWINCH, once and only once.
1512
Do nothing if the signal module is not available.
1514
global _registered_sigwinch
1515
if not _registered_sigwinch:
1518
if getattr(signal, "SIGWINCH", None) is not None:
1519
set_signal_handler(signal.SIGWINCH, _terminal_size_changed)
1521
# python doesn't provide signal support, nothing we can do about it
1523
_registered_sigwinch = True
1526
1674
def supports_executable():
1527
1675
return sys.platform != "win32"
1712
1861
global _selected_dir_reader
1713
1862
if _selected_dir_reader is None:
1714
fs_encoding = _fs_enc.upper()
1715
if sys.platform == "win32" and win32utils.winver == 'Windows NT':
1716
# Win98 doesn't have unicode apis like FindFirstFileW
1717
# TODO: We possibly could support Win98 by falling back to the
1718
# original FindFirstFile, and using TCHAR instead of WCHAR,
1719
# but that gets a bit tricky, and requires custom compiling
1863
if sys.platform == "win32":
1722
from bzrlib._walkdirs_win32 import Win32ReadDir
1865
from ._walkdirs_win32 import Win32ReadDir
1723
1866
_selected_dir_reader = Win32ReadDir()
1724
1867
except ImportError:
1726
elif fs_encoding in ('UTF-8', 'US-ASCII', 'ANSI_X3.4-1968'):
1727
# ANSI_X3.4-1968 is a form of ASCII
1869
elif _fs_enc in ('utf-8', 'ascii'):
1729
from bzrlib._readdir_pyx import UTF8DirReader
1871
from ._readdir_pyx import UTF8DirReader
1730
1872
_selected_dir_reader = UTF8DirReader()
1731
except ImportError, e:
1873
except ImportError as e:
1732
1874
failed_to_load_extension(e)
1779
1921
See DirReader.read_dir for details.
1781
1923
_utf8_encode = self._utf8_encode
1925
def _fs_decode(s): return s.decode(_fs_enc)
1927
def _fs_encode(s): return s.encode(_fs_enc)
1782
1928
_lstat = os.lstat
1783
1929
_listdir = os.listdir
1784
1930
_kind_from_mode = file_kind_from_stat_mode
1787
relprefix = prefix + '/'
1933
relprefix = prefix + b'/'
1790
top_slash = top + u'/'
1936
top_slash = top + '/'
1793
1939
append = dirblock.append
1794
for name in sorted(_listdir(top)):
1940
for name_native in _listdir(top.encode('utf-8')):
1796
name_utf8 = _utf8_encode(name)[0]
1942
name = _fs_decode(name_native)
1797
1943
except UnicodeDecodeError:
1798
1944
raise errors.BadFilenameEncoding(
1799
_utf8_encode(relprefix)[0] + name, _fs_enc)
1945
relprefix + name_native, _fs_enc)
1946
name_utf8 = _utf8_encode(name)[0]
1800
1947
abspath = top_slash + name
1801
1948
statvalue = _lstat(abspath)
1802
1949
kind = _kind_from_mode(statvalue.st_mode)
1803
1950
append((relprefix + name_utf8, name_utf8, kind, statvalue, abspath))
1951
return sorted(dirblock)
1807
1954
def copy_tree(from_path, to_path, handlers={}):
1874
2024
This can be used to sort paths in the same way that walkdirs does.
1876
return (dirname(path) , path)
2026
return (dirname(path), path)
1879
2029
def compare_paths_prefix_order(path_a, path_b):
1880
2030
"""Compare path_a and path_b to generate the same order walkdirs uses."""
1881
2031
key_a = path_prefix_key(path_a)
1882
2032
key_b = path_prefix_key(path_b)
1883
return cmp(key_a, key_b)
2033
return (key_a > key_b) - (key_a < key_b)
1886
2036
_cached_user_encoding = None
1889
def get_user_encoding(use_cache=True):
2039
def get_user_encoding():
1890
2040
"""Find out what the preferred user encoding is.
1892
2042
This is generally the encoding that is used for command line parameters
1893
2043
and file contents. This may be different from the terminal encoding
1894
2044
or the filesystem encoding.
1896
:param use_cache: Enable cache for detected encoding.
1897
(This parameter is turned on by default,
1898
and required only for selftesting)
1900
2046
:return: A string defining the preferred user encoding
1902
2048
global _cached_user_encoding
1903
if _cached_user_encoding is not None and use_cache:
2049
if _cached_user_encoding is not None:
1904
2050
return _cached_user_encoding
1906
if sys.platform == 'darwin':
1907
# python locale.getpreferredencoding() always return
1908
# 'mac-roman' on darwin. That's a lie.
1909
sys.platform = 'posix'
1911
if os.environ.get('LANG', None) is None:
1912
# If LANG is not set, we end up with 'ascii', which is bad
1913
# ('mac-roman' is more than ascii), so we set a default which
1914
# will give us UTF-8 (which appears to work in all cases on
1915
# OSX). Users are still free to override LANG of course, as
1916
# long as it give us something meaningful. This work-around
1917
# *may* not be needed with python 3k and/or OSX 10.5, but will
1918
# work with them too -- vila 20080908
1919
os.environ['LANG'] = 'en_US.UTF-8'
1922
sys.platform = 'darwin'
2052
if os.name == 'posix' and getattr(locale, 'CODESET', None) is not None:
2053
# Use the existing locale settings and call nl_langinfo directly
2054
# rather than going through getpreferredencoding. This avoids
2055
# <http://bugs.python.org/issue6202> on OSX Python 2.6 and the
2056
# possibility of the setlocale call throwing an error.
2057
user_encoding = locale.nl_langinfo(locale.CODESET)
2059
# GZ 2011-12-19: On windows could call GetACP directly instead.
2060
user_encoding = locale.getpreferredencoding(False)
1927
user_encoding = locale.getpreferredencoding()
1928
except locale.Error, e:
1929
sys.stderr.write('bzr: warning: %s\n'
1930
' Could not determine what text encoding to use.\n'
1931
' This error usually means your Python interpreter\n'
1932
' doesn\'t support the locale set by $LANG (%s)\n'
1933
" Continuing with ascii encoding.\n"
1934
% (e, os.environ.get('LANG')))
1935
user_encoding = 'ascii'
1937
# Windows returns 'cp0' to indicate there is no code page. So we'll just
1938
# treat that as ASCII, and not support printing unicode characters to the
1941
# For python scripts run under vim, we get '', so also treat that as ASCII
1942
if user_encoding in (None, 'cp0', ''):
1943
user_encoding = 'ascii'
1947
codecs.lookup(user_encoding)
1949
sys.stderr.write('bzr: warning:'
2063
user_encoding = codecs.lookup(user_encoding).name
2065
if user_encoding not in ("", "cp0"):
2066
sys.stderr.write('brz: warning:'
1950
2067
' unknown encoding %s.'
1951
2068
' Continuing with ascii encoding.\n'
1952
2069
% user_encoding
1954
user_encoding = 'ascii'
1957
_cached_user_encoding = user_encoding
2071
user_encoding = 'ascii'
2073
# Get 'ascii' when setlocale has not been called or LANG=C or unset.
2074
if user_encoding == 'ascii':
2075
if sys.platform == 'darwin':
2076
# OSX is special-cased in Python to have a UTF-8 filesystem
2077
# encoding and previously had LANG set here if not present.
2078
user_encoding = 'utf-8'
2079
# GZ 2011-12-19: Maybe UTF-8 should be the default in this case
2080
# for some other posix platforms as well.
2082
_cached_user_encoding = user_encoding
1959
2083
return user_encoding
2086
def get_diff_header_encoding():
2087
return get_terminal_encoding()
1962
2090
def get_host_name():
1963
2091
"""Return the current unicode host name.
1979
2108
# data at once.
1980
2109
MAX_SOCKET_CHUNK = 64 * 1024
2111
_end_of_stream_errors = [errno.ECONNRESET, errno.EPIPE, errno.EINVAL]
2112
for _eno in ['WSAECONNRESET', 'WSAECONNABORTED']:
2113
_eno = getattr(errno, _eno, None)
2114
if _eno is not None:
2115
_end_of_stream_errors.append(_eno)
1982
2119
def read_bytes_from_socket(sock, report_activity=None,
1983
max_read_size=MAX_SOCKET_CHUNK):
2120
max_read_size=MAX_SOCKET_CHUNK):
1984
2121
"""Read up to max_read_size of bytes from sock and notify of progress.
1986
2123
Translates "Connection reset by peer" into file-like EOF (return an
1987
2124
empty string rather than raise an error), and repeats the recv if
1988
2125
interrupted by a signal.
1992
bytes = sock.recv(max_read_size)
1993
except socket.error, e:
2129
data = sock.recv(max_read_size)
2130
except socket.error as e:
1994
2131
eno = e.args[0]
1995
if eno == getattr(errno, "WSAECONNRESET", errno.ECONNRESET):
2132
if eno in _end_of_stream_errors:
1996
2133
# The connection was closed by the other side. Callers expect
1997
2134
# an empty string to signal end-of-stream.
1999
2136
elif eno == errno.EINTR:
2000
2137
# Retry the interrupted recv.
2004
2141
if report_activity is not None:
2005
report_activity(len(bytes), 'read')
2142
report_activity(len(data), 'read')
2009
2146
def recv_all(socket, count):
2017
2154
This isn't optimized and is intended mostly for use in testing.
2020
2157
while len(b) < count:
2021
2158
new = read_bytes_from_socket(socket, None, count - len(b))
2028
2165
def send_all(sock, bytes, report_activity=None):
2029
2166
"""Send all bytes on a socket.
2031
2168
Breaks large blocks in smaller chunks to avoid buffering limitations on
2032
2169
some platforms, and catches EINTR which may be thrown if the send is
2033
2170
interrupted by a signal.
2035
2172
This is preferred to socket.sendall(), because it avoids portability bugs
2036
2173
and provides activity reporting.
2038
2175
:param report_activity: Call this as bytes are read, see
2039
2176
Transport._report_activity
2042
2179
byte_count = len(bytes)
2180
view = memoryview(bytes)
2043
2181
while sent_total < byte_count:
2045
sent = sock.send(buffer(bytes, sent_total, MAX_SOCKET_CHUNK))
2046
except socket.error, e:
2183
sent = sock.send(view[sent_total:sent_total + MAX_SOCKET_CHUNK])
2184
except (socket.error, IOError) as e:
2185
if e.args[0] in _end_of_stream_errors:
2186
raise errors.ConnectionReset(
2187
"Error trying to write to socket", e)
2047
2188
if e.args[0] != errno.EINTR:
2192
raise errors.ConnectionReset('Sending to %s returned 0 bytes'
2050
2194
sent_total += sent
2051
report_activity(sent, 'write')
2195
if report_activity is not None:
2196
report_activity(sent, 'write')
2199
def connect_socket(address):
2200
# Slight variation of the socket.create_connection() function (provided by
2201
# python-2.6) that can fail if getaddrinfo returns an empty list. We also
2202
# provide it for previous python versions. Also, we don't use the timeout
2203
# parameter (provided by the python implementation) so we don't implement
2205
err = socket.error('getaddrinfo returns an empty list')
2206
host, port = address
2207
for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
2208
af, socktype, proto, canonname, sa = res
2211
sock = socket.socket(af, socktype, proto)
2215
except socket.error as e:
2217
# 'err' is now the most recent error
2218
if sock is not None:
2054
2223
def dereference_path(path):
2082
2251
If and when pkg_resources becomes a standard library, this routine
2083
2252
can delegate to it.
2085
# Check package name is within bzrlib
2086
if package == "bzrlib":
2254
# Check package name is within breezy
2255
if package == "breezy":
2087
2256
resource_relpath = resource_name
2088
elif package.startswith("bzrlib."):
2089
package = package[len("bzrlib."):].replace('.', os.sep)
2257
elif package.startswith("breezy."):
2258
package = package[len("breezy."):].replace('.', os.sep)
2090
2259
resource_relpath = pathjoin(package, resource_name)
2092
raise errors.BzrError('resource package %s not in bzrlib' % package)
2261
raise errors.BzrError('resource package %s not in breezy' % package)
2094
2263
# Map the resource to a file and read its contents
2095
base = dirname(bzrlib.__file__)
2264
base = dirname(breezy.__file__)
2096
2265
if getattr(sys, 'frozen', None): # bzr.exe
2097
2266
base = abspath(pathjoin(base, '..', '..'))
2098
filename = pathjoin(base, resource_relpath)
2099
return open(filename, 'rU').read()
2267
with open(pathjoin(base, resource_relpath), "rt") as f:
2102
2271
def file_kind_from_stat_mode_thunk(mode):
2103
2272
global file_kind_from_stat_mode
2104
2273
if file_kind_from_stat_mode is file_kind_from_stat_mode_thunk:
2106
from bzrlib._readdir_pyx import UTF8DirReader
2275
from ._readdir_pyx import UTF8DirReader
2107
2276
file_kind_from_stat_mode = UTF8DirReader().kind_from_mode
2108
except ImportError, e:
2109
2278
# This is one time where we won't warn that an extension failed to
2110
2279
# load. The extension is never available on Windows anyway.
2111
from bzrlib._readdir_py import (
2280
from ._readdir_py import (
2112
2281
_kind_from_mode as file_kind_from_stat_mode
2114
2283
return file_kind_from_stat_mode(mode)
2115
2286
file_kind_from_stat_mode = file_kind_from_stat_mode_thunk
2118
def file_kind(f, _lstat=os.lstat):
2289
def file_stat(f, _lstat=os.lstat):
2120
return file_kind_from_stat_mode(_lstat(f).st_mode)
2293
except OSError as e:
2122
2294
if getattr(e, 'errno', None) in (errno.ENOENT, errno.ENOTDIR):
2123
2295
raise errors.NoSuchFile(f)
2299
def file_kind(f, _lstat=os.lstat):
2300
stat_value = file_stat(f, _lstat)
2301
return file_kind_from_stat_mode(stat_value.st_mode)
2127
2304
def until_no_eintr(f, *a, **kw):
2128
2305
"""Run f(*a, **kw), retrying if an EINTR error occurs.
2130
2307
WARNING: you must be certain that it is safe to retry the call repeatedly
2131
2308
if EINTR does occur. This is typically only true for low-level operations
2132
2309
like os.read. If in any doubt, don't use this.
2134
2311
Keep in mind that this is not a complete solution to EINTR. There is
2135
2312
probably code in the Python standard library and other dependencies that
2136
2313
may encounter EINTR if a signal arrives (and there is signal handler for
2137
that signal). So this function can reduce the impact for IO that bzrlib
2314
that signal). So this function can reduce the impact for IO that breezy
2138
2315
directly controls, but it is not a complete solution.
2140
2317
# Borrowed from Twisted's twisted.python.util.untilConcludes function.
2143
2320
return f(*a, **kw)
2144
except (IOError, OSError), e:
2321
except (IOError, OSError) as e:
2145
2322
if e.errno == errno.EINTR:
2150
def re_compile_checked(re_string, flags=0, where=""):
2151
"""Return a compiled re, or raise a sensible error.
2153
This should only be used when compiling user-supplied REs.
2155
:param re_string: Text form of regular expression.
2156
:param flags: eg re.IGNORECASE
2157
:param where: Message explaining to the user the context where
2158
it occurred, eg 'log search filter'.
2160
# from https://bugs.launchpad.net/bzr/+bug/251352
2162
re_obj = re.compile(re_string, flags)
2167
where = ' in ' + where
2168
# despite the name 'error' is a type
2169
raise errors.BzrCommandError('Invalid regular expression%s: %r: %s'
2170
% (where, re_string, e))
2173
2327
if sys.platform == "win32":
2176
2330
return msvcrt.getch()
2181
2335
fd = sys.stdin.fileno()
2182
2336
settings = termios.tcgetattr(fd)
2187
2341
termios.tcsetattr(fd, termios.TCSADRAIN, settings)
2191
if sys.platform == 'linux2':
2344
if sys.platform.startswith('linux'):
2192
2345
def _local_concurrency():
2194
prefix = 'processor'
2195
for line in file('/proc/cpuinfo', 'rb'):
2196
if line.startswith(prefix):
2197
concurrency = int(line[line.find(':')+1:]) + 1
2347
return os.sysconf('SC_NPROCESSORS_ONLN')
2348
except (ValueError, OSError, AttributeError):
2199
2350
elif sys.platform == 'darwin':
2200
2351
def _local_concurrency():
2201
2352
return subprocess.Popen(['sysctl', '-n', 'hw.availcpu'],
2202
2353
stdout=subprocess.PIPE).communicate()[0]
2203
elif sys.platform[0:7] == 'freebsd':
2354
elif "bsd" in sys.platform:
2204
2355
def _local_concurrency():
2205
2356
return subprocess.Popen(['sysctl', '-n', 'hw.ncpu'],
2206
2357
stdout=subprocess.PIPE).communicate()[0]
2207
2358
elif sys.platform == 'sunos5':
2208
2359
def _local_concurrency():
2209
return subprocess.Popen(['psrinfo', '-p',],
2360
return subprocess.Popen(['psrinfo', '-p', ],
2210
2361
stdout=subprocess.PIPE).communicate()[0]
2211
2362
elif sys.platform == "win32":
2212
2363
def _local_concurrency():
2231
2383
if _cached_local_concurrency is not None and use_cache:
2232
2384
return _cached_local_concurrency
2234
concurrency = os.environ.get('BZR_CONCURRENCY', None)
2386
concurrency = os.environ.get('BRZ_CONCURRENCY', None)
2235
2387
if concurrency is None:
2388
import multiprocessing
2237
concurrency = _local_concurrency()
2238
except (OSError, IOError):
2390
concurrency = multiprocessing.cpu_count()
2391
except NotImplementedError:
2392
# multiprocessing.cpu_count() isn't implemented on all platforms
2394
concurrency = _local_concurrency()
2395
except (OSError, IOError):
2241
2398
concurrency = int(concurrency)
2242
2399
except (TypeError, ValueError):
2243
2400
concurrency = 1
2245
_cached_concurrency = concurrency
2402
_cached_local_concurrency = concurrency
2246
2403
return concurrency
2302
2460
return os.fdopen(os.open(filename, flags), mode, bufsize)
2304
2462
open_file = open
2465
def available_backup_name(base, exists):
2466
"""Find a non-existing backup file name.
2468
This will *not* create anything, this only return a 'free' entry. This
2469
should be used for checking names in a directory below a locked
2470
tree/branch/repo to avoid race conditions. This is LBYL (Look Before You
2471
Leap) and generally discouraged.
2473
:param base: The base name.
2475
:param exists: A callable returning True if the path parameter exists.
2478
name = "%s.~%d~" % (base, counter)
2481
name = "%s.~%d~" % (base, counter)
2485
def set_fd_cloexec(fd):
2486
"""Set a Unix file descriptor's FD_CLOEXEC flag. Do nothing if platform
2487
support for this is not available.
2491
old = fcntl.fcntl(fd, fcntl.F_GETFD)
2492
fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
2493
except (ImportError, AttributeError):
2494
# Either the fcntl module or specific constants are not present
2498
def find_executable_on_path(name):
2499
"""Finds an executable on the PATH.
2501
On Windows, this will try to append each extension in the PATHEXT
2502
environment variable to the name, if it cannot be found with the name
2505
:param name: The base name of the executable.
2506
:return: The path to the executable found or None.
2508
if sys.platform == 'win32':
2509
exts = os.environ.get('PATHEXT', '').split(os.pathsep)
2510
exts = [ext.lower() for ext in exts]
2511
base, ext = os.path.splitext(name)
2513
if ext.lower() not in exts:
2519
path = os.environ.get('PATH')
2520
if path is not None:
2521
path = path.split(os.pathsep)
2524
f = os.path.join(d, name) + ext
2525
if os.access(f, os.X_OK):
2527
if sys.platform == 'win32':
2528
app_path = win32utils.get_app_path(name)
2529
if app_path != name:
2534
def _posix_is_local_pid_dead(pid):
2535
"""True if pid doesn't correspond to live process on this machine"""
2537
# Special meaning of unix kill: just check if it's there.
2539
except OSError as e:
2540
if e.errno == errno.ESRCH:
2541
# On this machine, and really not found: as sure as we can be
2544
elif e.errno == errno.EPERM:
2545
# exists, though not ours
2548
trace.mutter("os.kill(%d, 0) failed: %s" % (pid, e))
2549
# Don't really know.
2552
# Exists and our process: not dead.
2556
if sys.platform == "win32":
2557
is_local_pid_dead = win32utils.is_local_pid_dead
2559
is_local_pid_dead = _posix_is_local_pid_dead
2561
_maybe_ignored = ['EAGAIN', 'EINTR', 'ENOTSUP', 'EOPNOTSUPP', 'EACCES']
2562
_fdatasync_ignored = [getattr(errno, name) for name in _maybe_ignored
2563
if getattr(errno, name, None) is not None]
2566
def fdatasync(fileno):
2567
"""Flush file contents to disk if possible.
2569
:param fileno: Integer OS file handle.
2570
:raises TransportNotPossible: If flushing to disk is not possible.
2572
fn = getattr(os, 'fdatasync', getattr(os, 'fsync', None))
2576
except IOError as e:
2577
# See bug #1075108, on some platforms fdatasync exists, but can
2578
# raise ENOTSUP. However, we are calling fdatasync to be helpful
2579
# and reduce the chance of corruption-on-powerloss situations. It
2580
# is not a mandatory call, so it is ok to suppress failures.
2581
trace.mutter("ignoring error calling fdatasync: %s" % (e,))
2582
if getattr(e, 'errno', None) not in _fdatasync_ignored:
2586
def ensure_empty_directory_exists(path, exception_class):
2587
"""Make sure a local directory exists and is empty.
2589
If it does not exist, it is created. If it exists and is not empty, an
2590
instance of exception_class is raised.
2594
except OSError as e:
2595
if e.errno != errno.EEXIST:
2597
if os.listdir(path) != []:
2598
raise exception_class(path)
2601
def is_environment_error(evalue):
2602
"""True if exception instance is due to a process environment issue
2604
This includes OSError and IOError, but also other errors that come from
2605
the operating system or core libraries but are not subclasses of those.
2607
if isinstance(evalue, (EnvironmentError, select.error)):
2609
if sys.platform == "win32" and win32utils._is_pywintypes_error(evalue):