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 brzlib.lazy_import import lazy_import
26
28
lazy_import(globals(), """
27
29
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,
30
from datetime import timedelta
36
# We need to import both shutil and rmtree as we export the later on posix
37
# and need the former on windows
39
from shutil import rmtree
42
# We need to import both tempfile and mkdtemp as we export the later on posix
43
# and need the former on windows
43
from tempfile import (
45
from tempfile import mkdtemp
55
from brzlib.i18n import gettext
56
from bzrlib.symbol_versioning import (
58
from brzlib.symbol_versioning import (
57
60
deprecated_function,
61
# sha and md5 modules are deprecated in python2.6 but hashlib is available as
63
if sys.version_info < (2, 5):
64
import md5 as _mod_md5
66
import sha as _mod_sha
76
from bzrlib import symbol_versioning
63
warn as warn_deprecated,
73
from brzlib import symbol_versioning, _fs_enc
79
76
# Cross platform wall-clock time functionality with decent resolution.
110
107
mod = os.lstat(filename).st_mode
111
108
if not stat.S_ISLNK(mod):
112
109
mod = mod & 0777555
113
os.chmod(filename, mod)
110
chmod_if_possible(filename, mod)
116
113
def make_writable(filename):
117
114
mod = os.lstat(filename).st_mode
118
115
if not stat.S_ISLNK(mod):
120
os.chmod(filename, mod)
117
chmod_if_possible(filename, mod)
120
def chmod_if_possible(filename, mode):
121
# Set file mode if that can be safely done.
122
# Sometimes even on unix the filesystem won't allow it - see
123
# https://bugs.launchpad.net/bzr/+bug/606537
125
# It is probably faster to just do the chmod, rather than
126
# doing a stat, and then trying to compare
127
os.chmod(filename, mode)
128
except (IOError, OSError),e:
129
# Permission/access denied seems to commonly happen on smbfs; there's
130
# probably no point warning about it.
131
# <https://bugs.launchpad.net/bzr/+bug/606537>
132
if getattr(e, 'errno') in (errno.EPERM, errno.EACCES):
133
trace.mutter("ignore error on chmod of %r: %r" % (
123
139
def minimum_path_selection(paths):
275
291
rename_func(tmp_name, new)
276
292
if failure_exc is not None:
277
raise failure_exc[0], failure_exc[1], failure_exc[2]
294
raise failure_exc[0], failure_exc[1], failure_exc[2]
280
299
# In Python 2.4.2 and older, os.path.abspath and os.path.realpath
281
300
# choke on a Unicode string containing a relative path if
282
301
# os.getcwd() returns a non-sys.getdefaultencoding()-encoded
284
_fs_enc = sys.getfilesystemencoding() or 'utf-8'
285
303
def _posix_abspath(path):
286
304
# jam 20060426 rather than encoding to fsencoding
287
305
# copy posixpath.abspath, but use os.getcwdu instead
288
306
if not posixpath.isabs(path):
289
307
path = posixpath.join(getcwd(), path)
290
return posixpath.normpath(path)
308
return _posix_normpath(path)
293
311
def _posix_realpath(path):
294
312
return posixpath.realpath(path.encode(_fs_enc)).decode(_fs_enc)
315
def _posix_normpath(path):
316
path = posixpath.normpath(path)
317
# Bug 861008: posixpath.normpath() returns a path normalized according to
318
# the POSIX standard, which stipulates (for compatibility reasons) that two
319
# leading slashes must not be simplified to one, and only if there are 3 or
320
# more should they be simplified as one. So we treat the leading 2 slashes
321
# as a special case here by simply removing the first slash, as we consider
322
# that breaking POSIX compatibility for this obscure feature is acceptable.
323
# This is not a paranoid precaution, as we notably get paths like this when
324
# the repo is hosted at the root of the filesystem, i.e. in "/".
325
if path.startswith('//'):
330
def _posix_path_from_environ(key):
331
"""Get unicode path from `key` in environment or None if not present
333
Note that posix systems use arbitrary byte strings for filesystem objects,
334
so a path that raises BadFilenameEncoding here may still be accessible.
336
val = os.environ.get(key, None)
340
return val.decode(_fs_enc)
341
except UnicodeDecodeError:
342
# GZ 2011-12-12:Ideally want to include `key` in the exception message
343
raise errors.BadFilenameEncoding(val, _fs_enc)
346
def _posix_get_home_dir():
347
"""Get the home directory of the current user as a unicode path"""
348
path = posixpath.expanduser("~")
350
return path.decode(_fs_enc)
351
except UnicodeDecodeError:
352
raise errors.BadFilenameEncoding(path, _fs_enc)
355
def _posix_getuser_unicode():
356
"""Get username from environment or password database as unicode"""
357
name = getpass.getuser()
358
user_encoding = get_user_encoding()
360
return name.decode(user_encoding)
361
except UnicodeDecodeError:
362
raise errors.BzrError("Encoding of username %r is unsupported by %s "
363
"application locale." % (name, user_encoding))
297
366
def _win32_fixdrive(path):
298
367
"""Force drive letters to be consistent.
326
395
# /path => C:/path
327
396
path = unicode(path)
328
397
# check for absolute path
329
drive = _nt_splitdrive(path)[0]
398
drive = ntpath.splitdrive(path)[0]
330
399
if drive == '' and path[:2] not in('//','\\\\'):
331
400
cwd = os.getcwdu()
332
401
# we cannot simply os.path.join cwd and path
333
402
# because os.path.join('C:','/path') produce '/path'
334
403
# and this is incorrect
335
404
if path[:1] in ('/','\\'):
336
cwd = _nt_splitdrive(cwd)[0]
405
cwd = ntpath.splitdrive(cwd)[0]
338
407
path = cwd + '\\' + path
339
return _win32_fixdrive(_nt_normpath(path).replace('\\', '/'))
408
return _win32_fixdrive(ntpath.normpath(path).replace('\\', '/'))
342
411
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('\\', '/'))
412
# Real ntpath.realpath doesn't have a problem with a unicode cwd
413
return _win32_fixdrive(ntpath.realpath(unicode(path)).replace('\\', '/'))
347
416
def _win32_pathjoin(*args):
348
return _nt_join(*args).replace('\\', '/')
417
return ntpath.join(*args).replace('\\', '/')
351
420
def _win32_normpath(path):
352
return _win32_fixdrive(_nt_normpath(unicode(path)).replace('\\', '/'))
421
return _win32_fixdrive(ntpath.normpath(unicode(path)).replace('\\', '/'))
355
424
def _win32_getcwd():
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
450
def _mac_getcwd():
400
451
return unicodedata.normalize('NFC', os.getcwdu())
454
def _rename_wrap_exception(rename_func):
455
"""Adds extra information to any exceptions that come from rename().
457
The exception has an updated message and 'old_filename' and 'new_filename'
461
def _rename_wrapper(old, new):
463
rename_func(old, new)
465
detailed_error = OSError(e.errno, e.strerror +
466
" [occurred when renaming '%s' to '%s']" %
468
detailed_error.old_filename = old
469
detailed_error.new_filename = new
472
return _rename_wrapper
474
# Default rename wraps os.rename()
475
rename = _rename_wrap_exception(os.rename)
403
477
# Default is to just use the python builtins, but these can be rebound on
404
478
# particular platforms.
405
479
abspath = _posix_abspath
406
480
realpath = _posix_realpath
407
481
pathjoin = os.path.join
408
normpath = os.path.normpath
409
rename = _wrapped_rename # overridden below on win32
482
normpath = _posix_normpath
483
path_from_environ = _posix_path_from_environ
484
_get_home_dir = _posix_get_home_dir
485
getuser_unicode = _posix_getuser_unicode
410
486
getcwd = os.getcwdu
411
487
dirname = os.path.dirname
412
488
basename = os.path.basename
413
489
split = os.path.split
414
490
splitext = os.path.splitext
415
# These were already imported into local scope
491
# These were already lazily imported into local scope
416
492
# mkdtemp = tempfile.mkdtemp
417
493
# rmtree = shutil.rmtree
419
501
MIN_ABS_PATHLENGTH = 1
471
564
On my standard US Windows XP, the preferred encoding is
472
565
cp1252, but the console is cp437
567
:param trace: If True trace the selected encoding via mutter().
474
from bzrlib.trace import mutter
569
from brzlib.trace import mutter
475
570
output_encoding = getattr(sys.stdout, 'encoding', None)
476
571
if not output_encoding:
477
572
input_encoding = getattr(sys.stdin, 'encoding', None)
478
573
if not input_encoding:
479
574
output_encoding = get_user_encoding()
480
mutter('encoding stdout as osutils.get_user_encoding() %r',
576
mutter('encoding stdout as osutils.get_user_encoding() %r',
483
579
output_encoding = input_encoding
484
mutter('encoding stdout as sys.stdin encoding %r', output_encoding)
581
mutter('encoding stdout as sys.stdin encoding %r',
486
mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
585
mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
487
586
if output_encoding == 'cp0':
488
587
# invalid encoding (cp0 means 'no codepage' on Windows)
489
588
output_encoding = get_user_encoding()
490
mutter('cp0 is invalid encoding.'
590
mutter('cp0 is invalid encoding.'
491
591
' encoding stdout as osutils.get_user_encoding() %r',
495
595
codecs.lookup(output_encoding)
496
596
except LookupError:
497
sys.stderr.write('bzr: warning:'
597
sys.stderr.write('brz: warning:'
498
598
' unknown terminal encoding %s.\n'
499
599
' Using encoding %s instead.\n'
500
600
% (output_encoding, get_user_encoding())
882
992
"""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
993
return os.fstat(f.fileno())[stat.ST_SIZE]
996
# Alias os.urandom to support platforms (which?) without /dev/urandom and
997
# override if it doesn't work. Avoid checking on windows where there is
998
# significant initialisation cost that can be avoided for some bzr calls.
1000
rand_bytes = os.urandom
1002
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):
1005
except NotImplementedError:
899
1006
# not well seeded, but better than nothing
900
1007
def rand_bytes(n):
970
1077
implementation should be loaded instead::
973
>>> import bzrlib._fictional_extension_pyx
1080
>>> import brzlib._fictional_extension_pyx
974
1081
>>> except ImportError, e:
975
>>> bzrlib.osutils.failed_to_load_extension(e)
976
>>> import bzrlib._fictional_extension_py
1082
>>> brzlib.osutils.failed_to_load_extension(e)
1083
>>> import brzlib._fictional_extension_py
978
1085
# NB: This docstring is just an example, not a doctest, because doctest
979
1086
# currently can't cope with the use of lazy imports in this namespace --
982
1089
# This currently doesn't report the failure at the time it occurs, because
983
1090
# they tend to happen very early in startup when we can't check config
984
1091
# files etc, and also we want to report all failures but not spam the user
985
1092
# with 10 warnings.
986
from bzrlib import trace
987
1093
exception_str = str(exception)
988
1094
if exception_str not in _extension_load_failures:
989
1095
trace.mutter("failed to load compiled extension: %s" % exception_str)
1427
1554
- if BZR_COLUMNS is set, returns its value
1428
1555
- if there is no controlling terminal, returns None
1556
- query the OS, if the queried size has changed since the last query,
1429
1558
- if COLUMNS is set, returns its value,
1559
- if the OS has a value (even though it's never changed), return its value.
1431
1561
From there, we need to query the OS to get the size of the controlling
1564
On Unices we query the OS by:
1435
1565
- get termios.TIOCGWINSZ
1436
1566
- if an error occurs or a negative value is obtained, returns None
1568
On Windows we query the OS by:
1440
1569
- win32utils.get_console_size() decides,
1441
1570
- returns None on error (provided default value)
1572
# Note to implementors: if changing the rules for determining the width,
1573
# make sure you've considered the behaviour in these cases:
1574
# - M-x shell in emacs, where $COLUMNS is set and TIOCGWINSZ returns 0,0.
1575
# - bzr log | less, in bash, where $COLUMNS not set and TIOCGWINSZ returns
1577
# - (add more interesting cases here, if you find any)
1578
# Some programs implement "Use $COLUMNS (if set) until SIGWINCH occurs",
1579
# but we don't want to register a signal handler because it is impossible
1580
# to do so without risking EINTR errors in Python <= 2.6.5 (see
1581
# <http://bugs.python.org/issue8354>). Instead we check TIOCGWINSZ every
1582
# time so we can notice if the reported size has changed, which should have
1444
1585
# If BZR_COLUMNS is set, take it, user is always right
1586
# Except if they specified 0 in which case, impose no limit here
1446
return int(os.environ['BZR_COLUMNS'])
1588
width = int(os.environ['BZR_COLUMNS'])
1447
1589
except (KeyError, ValueError):
1591
if width is not None:
1450
1597
isatty = getattr(sys.stdout, 'isatty', None)
1451
if isatty is None or not isatty():
1598
if isatty is None or not isatty():
1452
1599
# Don't guess, setting BZR_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))
1603
width, height = os_size = _terminal_size(None, None)
1604
global _first_terminal_size, _terminal_size_state
1605
if _terminal_size_state == 'no_data':
1606
_first_terminal_size = os_size
1607
_terminal_size_state = 'unchanged'
1608
elif (_terminal_size_state == 'unchanged' and
1609
_first_terminal_size != os_size):
1610
_terminal_size_state = 'changed'
1612
# If the OS claims to know how wide the terminal is, and this value has
1613
# ever changed, use that.
1614
if _terminal_size_state == 'changed':
1615
if width is not None and width > 0:
1618
# If COLUMNS is set, use it.
1459
1620
return int(os.environ['COLUMNS'])
1460
1621
except (KeyError, ValueError):
1463
width, height = _terminal_size(None, None)
1465
# Consider invalid values as meaning no width
1624
# Finally, use an unchanged size from the OS, if we have one.
1625
if _terminal_size_state == 'unchanged':
1626
if width is not None and width > 0:
1629
# The width could not be determined.
1471
1633
def _win32_terminal_size(width, height):
1498
1660
_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
1663
def supports_executable():
1527
1664
return sys.platform != "win32"
1886
2024
_cached_user_encoding = None
1889
def get_user_encoding(use_cache=True):
2027
def get_user_encoding(use_cache=DEPRECATED_PARAMETER):
1890
2028
"""Find out what the preferred user encoding is.
1892
2030
This is generally the encoding that is used for command line parameters
1893
2031
and file contents. This may be different from the terminal encoding
1894
2032
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
2034
:return: A string defining the preferred user encoding
1902
2036
global _cached_user_encoding
1903
if _cached_user_encoding is not None and use_cache:
2037
if deprecated_passed(use_cache):
2038
warn_deprecated("use_cache should only have been used for tests",
2039
DeprecationWarning, stacklevel=2)
2040
if _cached_user_encoding is not None:
1904
2041
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'
2043
if os.name == 'posix' and getattr(locale, 'CODESET', None) is not None:
2044
# Use the existing locale settings and call nl_langinfo directly
2045
# rather than going through getpreferredencoding. This avoids
2046
# <http://bugs.python.org/issue6202> on OSX Python 2.6 and the
2047
# possibility of the setlocale call throwing an error.
2048
user_encoding = locale.nl_langinfo(locale.CODESET)
2050
# GZ 2011-12-19: On windows could call GetACP directly instead.
2051
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:'
2054
user_encoding = codecs.lookup(user_encoding).name
2056
if user_encoding not in ("", "cp0"):
2057
sys.stderr.write('brz: warning:'
1950
2058
' unknown encoding %s.'
1951
2059
' Continuing with ascii encoding.\n'
1952
2060
% user_encoding
1954
user_encoding = 'ascii'
1957
_cached_user_encoding = user_encoding
2062
user_encoding = 'ascii'
2064
# Get 'ascii' when setlocale has not been called or LANG=C or unset.
2065
if user_encoding == 'ascii':
2066
if sys.platform == 'darwin':
2067
# OSX is special-cased in Python to have a UTF-8 filesystem
2068
# encoding and previously had LANG set here if not present.
2069
user_encoding = 'utf-8'
2070
# GZ 2011-12-19: Maybe UTF-8 should be the default in this case
2071
# for some other posix platforms as well.
2073
_cached_user_encoding = user_encoding
1959
2074
return user_encoding
2077
def get_diff_header_encoding():
2078
return get_terminal_encoding()
1962
2081
def get_host_name():
1963
2082
"""Return the current unicode host name.
2043
2169
while sent_total < byte_count:
2045
2171
sent = sock.send(buffer(bytes, sent_total, MAX_SOCKET_CHUNK))
2046
except socket.error, e:
2172
except (socket.error, IOError), e:
2173
if e.args[0] in _end_of_stream_errors:
2174
raise errors.ConnectionReset(
2175
"Error trying to write to socket", e)
2047
2176
if e.args[0] != errno.EINTR:
2180
raise errors.ConnectionReset('Sending to %s returned 0 bytes'
2050
2182
sent_total += sent
2051
report_activity(sent, 'write')
2183
if report_activity is not None:
2184
report_activity(sent, 'write')
2187
def connect_socket(address):
2188
# Slight variation of the socket.create_connection() function (provided by
2189
# python-2.6) that can fail if getaddrinfo returns an empty list. We also
2190
# provide it for previous python versions. Also, we don't use the timeout
2191
# parameter (provided by the python implementation) so we don't implement
2193
err = socket.error('getaddrinfo returns an empty list')
2194
host, port = address
2195
for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
2196
af, socktype, proto, canonname, sa = res
2199
sock = socket.socket(af, socktype, proto)
2203
except socket.error, err:
2204
# 'err' is now the most recent error
2205
if sock is not None:
2054
2210
def dereference_path(path):
2082
2238
If and when pkg_resources becomes a standard library, this routine
2083
2239
can delegate to it.
2085
# Check package name is within bzrlib
2086
if package == "bzrlib":
2241
# Check package name is within brzlib
2242
if package == "brzlib":
2087
2243
resource_relpath = resource_name
2088
elif package.startswith("bzrlib."):
2089
package = package[len("bzrlib."):].replace('.', os.sep)
2244
elif package.startswith("brzlib."):
2245
package = package[len("brzlib."):].replace('.', os.sep)
2090
2246
resource_relpath = pathjoin(package, resource_name)
2092
raise errors.BzrError('resource package %s not in bzrlib' % package)
2248
raise errors.BzrError('resource package %s not in brzlib' % package)
2094
2250
# Map the resource to a file and read its contents
2095
base = dirname(bzrlib.__file__)
2251
base = dirname(brzlib.__file__)
2096
2252
if getattr(sys, 'frozen', None): # bzr.exe
2097
2253
base = abspath(pathjoin(base, '..', '..'))
2098
filename = pathjoin(base, resource_relpath)
2099
return open(filename, 'rU').read()
2254
f = file(pathjoin(base, resource_relpath), "rU")
2102
2260
def file_kind_from_stat_mode_thunk(mode):
2103
2261
global file_kind_from_stat_mode
2104
2262
if file_kind_from_stat_mode is file_kind_from_stat_mode_thunk:
2106
from bzrlib._readdir_pyx import UTF8DirReader
2264
from brzlib._readdir_pyx import UTF8DirReader
2107
2265
file_kind_from_stat_mode = UTF8DirReader().kind_from_mode
2108
2266
except ImportError, e:
2109
2267
# This is one time where we won't warn that an extension failed to
2110
2268
# load. The extension is never available on Windows anyway.
2111
from bzrlib._readdir_py import (
2269
from brzlib._readdir_py import (
2112
2270
_kind_from_mode as file_kind_from_stat_mode
2114
2272
return file_kind_from_stat_mode(mode)
2115
2273
file_kind_from_stat_mode = file_kind_from_stat_mode_thunk
2118
def file_kind(f, _lstat=os.lstat):
2275
def file_stat(f, _lstat=os.lstat):
2120
return file_kind_from_stat_mode(_lstat(f).st_mode)
2121
2279
except OSError, e:
2122
2280
if getattr(e, 'errno', None) in (errno.ENOENT, errno.ENOTDIR):
2123
2281
raise errors.NoSuchFile(f)
2284
def file_kind(f, _lstat=os.lstat):
2285
stat_value = file_stat(f, _lstat)
2286
return file_kind_from_stat_mode(stat_value.st_mode)
2127
2288
def until_no_eintr(f, *a, **kw):
2128
2289
"""Run f(*a, **kw), retrying if an EINTR error occurs.
2130
2291
WARNING: you must be certain that it is safe to retry the call repeatedly
2131
2292
if EINTR does occur. This is typically only true for low-level operations
2132
2293
like os.read. If in any doubt, don't use this.
2187
2349
termios.tcsetattr(fd, termios.TCSADRAIN, settings)
2191
if sys.platform == 'linux2':
2352
if sys.platform.startswith('linux'):
2192
2353
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
2355
return os.sysconf('SC_NPROCESSORS_ONLN')
2356
except (ValueError, OSError, AttributeError):
2199
2358
elif sys.platform == 'darwin':
2200
2359
def _local_concurrency():
2201
2360
return subprocess.Popen(['sysctl', '-n', 'hw.availcpu'],
2202
2361
stdout=subprocess.PIPE).communicate()[0]
2203
elif sys.platform[0:7] == 'freebsd':
2362
elif "bsd" in sys.platform:
2204
2363
def _local_concurrency():
2205
2364
return subprocess.Popen(['sysctl', '-n', 'hw.ncpu'],
2206
2365
stdout=subprocess.PIPE).communicate()[0]
2302
2468
return os.fdopen(os.open(filename, flags), mode, bufsize)
2304
2470
open_file = open
2473
def available_backup_name(base, exists):
2474
"""Find a non-existing backup file name.
2476
This will *not* create anything, this only return a 'free' entry. This
2477
should be used for checking names in a directory below a locked
2478
tree/branch/repo to avoid race conditions. This is LBYL (Look Before You
2479
Leap) and generally discouraged.
2481
:param base: The base name.
2483
:param exists: A callable returning True if the path parameter exists.
2486
name = "%s.~%d~" % (base, counter)
2489
name = "%s.~%d~" % (base, counter)
2493
def set_fd_cloexec(fd):
2494
"""Set a Unix file descriptor's FD_CLOEXEC flag. Do nothing if platform
2495
support for this is not available.
2499
old = fcntl.fcntl(fd, fcntl.F_GETFD)
2500
fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
2501
except (ImportError, AttributeError):
2502
# Either the fcntl module or specific constants are not present
2506
def find_executable_on_path(name):
2507
"""Finds an executable on the PATH.
2509
On Windows, this will try to append each extension in the PATHEXT
2510
environment variable to the name, if it cannot be found with the name
2513
:param name: The base name of the executable.
2514
:return: The path to the executable found or None.
2516
if sys.platform == 'win32':
2517
exts = os.environ.get('PATHEXT', '').split(os.pathsep)
2518
exts = [ext.lower() for ext in exts]
2519
base, ext = os.path.splitext(name)
2521
if ext.lower() not in exts:
2527
path = os.environ.get('PATH')
2528
if path is not None:
2529
path = path.split(os.pathsep)
2532
f = os.path.join(d, name) + ext
2533
if os.access(f, os.X_OK):
2535
if sys.platform == 'win32':
2536
app_path = win32utils.get_app_path(name)
2537
if app_path != name:
2542
def _posix_is_local_pid_dead(pid):
2543
"""True if pid doesn't correspond to live process on this machine"""
2545
# Special meaning of unix kill: just check if it's there.
2548
if e.errno == errno.ESRCH:
2549
# On this machine, and really not found: as sure as we can be
2552
elif e.errno == errno.EPERM:
2553
# exists, though not ours
2556
mutter("os.kill(%d, 0) failed: %s" % (pid, e))
2557
# Don't really know.
2560
# Exists and our process: not dead.
2563
if sys.platform == "win32":
2564
is_local_pid_dead = win32utils.is_local_pid_dead
2566
is_local_pid_dead = _posix_is_local_pid_dead
2568
_maybe_ignored = ['EAGAIN', 'EINTR', 'ENOTSUP', 'EOPNOTSUPP', 'EACCES']
2569
_fdatasync_ignored = [getattr(errno, name) for name in _maybe_ignored
2570
if getattr(errno, name, None) is not None]
2573
def fdatasync(fileno):
2574
"""Flush file contents to disk if possible.
2576
:param fileno: Integer OS file handle.
2577
:raises TransportNotPossible: If flushing to disk is not possible.
2579
fn = getattr(os, 'fdatasync', getattr(os, 'fsync', None))
2584
# See bug #1075108, on some platforms fdatasync exists, but can
2585
# raise ENOTSUP. However, we are calling fdatasync to be helpful
2586
# and reduce the chance of corruption-on-powerloss situations. It
2587
# is not a mandatory call, so it is ok to suppress failures.
2588
trace.mutter("ignoring error calling fdatasync: %s" % (e,))
2589
if getattr(e, 'errno', None) not in _fdatasync_ignored:
2593
def ensure_empty_directory_exists(path, exception_class):
2594
"""Make sure a local directory exists and is empty.
2596
If it does not exist, it is created. If it exists and is not empty, an
2597
instance of exception_class is raised.
2602
if e.errno != errno.EEXIST:
2604
if os.listdir(path) != []:
2605
raise exception_class(path)
2608
def is_environment_error(evalue):
2609
"""True if exception instance is due to a process environment issue
2611
This includes OSError and IOError, but also other errors that come from
2612
the operating system or core libraries but are not subclasses of those.
2614
if isinstance(evalue, (EnvironmentError, select.error)):
2616
if sys.platform == "win32" and win32utils._is_pywintypes_error(evalue):