20
from stat import S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE
20
from stat import (S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE,
21
S_ISCHR, S_ISBLK, S_ISFIFO, S_ISSOCK)
25
26
from bzrlib.lazy_import import lazy_import
26
27
lazy_import(globals(), """
27
29
from datetime import datetime
29
31
from ntpath import (abspath as _nt_abspath,
360
354
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
357
def _win32_rename(old, new):
372
358
"""We expect to be able to atomically replace 'new' with old.
1427
1401
- if BZR_COLUMNS is set, returns its value
1428
1402
- if there is no controlling terminal, returns None
1403
- query the OS, if the queried size has changed since the last query,
1429
1405
- if COLUMNS is set, returns its value,
1406
- if the OS has a value (even though it's never changed), return its value.
1431
1408
From there, we need to query the OS to get the size of the controlling
1411
On Unices we query the OS by:
1435
1412
- get termios.TIOCGWINSZ
1436
1413
- if an error occurs or a negative value is obtained, returns None
1415
On Windows we query the OS by:
1440
1416
- win32utils.get_console_size() decides,
1441
1417
- returns None on error (provided default value)
1419
# Note to implementors: if changing the rules for determining the width,
1420
# make sure you've considered the behaviour in these cases:
1421
# - M-x shell in emacs, where $COLUMNS is set and TIOCGWINSZ returns 0,0.
1422
# - bzr log | less, in bash, where $COLUMNS not set and TIOCGWINSZ returns
1424
# - (add more interesting cases here, if you find any)
1425
# Some programs implement "Use $COLUMNS (if set) until SIGWINCH occurs",
1426
# but we don't want to register a signal handler because it is impossible
1427
# to do so without risking EINTR errors in Python <= 2.6.5 (see
1428
# <http://bugs.python.org/issue8354>). Instead we check TIOCGWINSZ every
1429
# time so we can notice if the reported size has changed, which should have
1444
1432
# If BZR_COLUMNS is set, take it, user is always right
1450
1438
isatty = getattr(sys.stdout, 'isatty', None)
1451
if isatty is None or not isatty():
1439
if isatty is None or not isatty():
1452
1440
# 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))
1444
width, height = os_size = _terminal_size(None, None)
1445
global _first_terminal_size, _terminal_size_state
1446
if _terminal_size_state == 'no_data':
1447
_first_terminal_size = os_size
1448
_terminal_size_state = 'unchanged'
1449
elif (_terminal_size_state == 'unchanged' and
1450
_first_terminal_size != os_size):
1451
_terminal_size_state = 'changed'
1453
# If the OS claims to know how wide the terminal is, and this value has
1454
# ever changed, use that.
1455
if _terminal_size_state == 'changed':
1456
if width is not None and width > 0:
1459
# If COLUMNS is set, use it.
1459
1461
return int(os.environ['COLUMNS'])
1460
1462
except (KeyError, ValueError):
1463
width, height = _terminal_size(None, None)
1465
# Consider invalid values as meaning no width
1465
# Finally, use an unchanged size from the OS, if we have one.
1466
if _terminal_size_state == 'unchanged':
1467
if width is not None and width > 0:
1470
# The width could not be determined.
1471
1474
def _win32_terminal_size(width, height):
1498
1501
_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
1504
def supports_executable():
1527
1505
return sys.platform != "win32"
1846
1824
real_handlers[kind](abspath, relpath)
1849
def copy_ownership_from_path(dst, src=None):
1850
"""Copy usr/grp ownership from src file/dir to dst file/dir.
1852
If src is None, the containing directory is used as source. If chown
1853
fails, the error is ignored and a warning is printed.
1855
chown = getattr(os, 'chown', None)
1860
src = os.path.dirname(dst)
1866
chown(dst, s.st_uid, s.st_gid)
1868
trace.warning("Unable to copy ownership from '%s' to '%s': IOError: %s." % (src, dst, e))
1871
1827
def path_prefix_key(path):
1872
1828
"""Generate a prefix-order path key for path.
1973
1929
return socket.gethostname().decode(get_user_encoding())
1976
# We must not read/write any more than 64k at a time from/to a socket so we
1977
# don't risk "no buffer space available" errors on some platforms. Windows in
1978
# particular is likely to throw WSAECONNABORTED or WSAENOBUFS if given too much
1980
MAX_SOCKET_CHUNK = 64 * 1024
1982
def read_bytes_from_socket(sock, report_activity=None,
1983
max_read_size=MAX_SOCKET_CHUNK):
1984
"""Read up to max_read_size of bytes from sock and notify of progress.
1986
Translates "Connection reset by peer" into file-like EOF (return an
1987
empty string rather than raise an error), and repeats the recv if
1988
interrupted by a signal.
1992
bytes = sock.recv(max_read_size)
1993
except socket.error, e:
1995
if eno == getattr(errno, "WSAECONNRESET", errno.ECONNRESET):
1996
# The connection was closed by the other side. Callers expect
1997
# an empty string to signal end-of-stream.
1999
elif eno == errno.EINTR:
2000
# Retry the interrupted recv.
2004
if report_activity is not None:
2005
report_activity(len(bytes), 'read')
2009
def recv_all(socket, count):
1932
def recv_all(socket, bytes):
2010
1933
"""Receive an exact number of bytes.
2012
1935
Regular Socket.recv() may return less than the requested number of bytes,
2013
depending on what's in the OS buffer. MSG_WAITALL is not available
1936
dependning on what's in the OS buffer. MSG_WAITALL is not available
2014
1937
on all platforms, but this should work everywhere. This will return
2015
1938
less than the requested amount if the remote end closes.
2017
1940
This isn't optimized and is intended mostly for use in testing.
2020
while len(b) < count:
2021
new = read_bytes_from_socket(socket, None, count - len(b))
1943
while len(b) < bytes:
1944
new = until_no_eintr(socket.recv, bytes - len(b))
2028
def send_all(sock, bytes, report_activity=None):
1951
def send_all(socket, bytes, report_activity=None):
2029
1952
"""Send all bytes on a socket.
2031
Breaks large blocks in smaller chunks to avoid buffering limitations on
2032
some platforms, and catches EINTR which may be thrown if the send is
2033
interrupted by a signal.
2035
This is preferred to socket.sendall(), because it avoids portability bugs
2036
and provides activity reporting.
1954
Regular socket.sendall() can give socket error 10053 on Windows. This
1955
implementation sends no more than 64k at a time, which avoids this problem.
2038
1957
:param report_activity: Call this as bytes are read, see
2039
1958
Transport._report_activity
2042
byte_count = len(bytes)
2043
while sent_total < byte_count:
2045
sent = sock.send(buffer(bytes, sent_total, MAX_SOCKET_CHUNK))
2046
except socket.error, e:
2047
if e.args[0] != errno.EINTR:
2051
report_activity(sent, 'write')
1961
for pos in xrange(0, len(bytes), chunk_size):
1962
block = bytes[pos:pos+chunk_size]
1963
if report_activity is not None:
1964
report_activity(len(block), 'write')
1965
until_no_eintr(socket.sendall, block)
2054
1968
def dereference_path(path):
2127
2041
def until_no_eintr(f, *a, **kw):
2128
"""Run f(*a, **kw), retrying if an EINTR error occurs.
2130
WARNING: you must be certain that it is safe to retry the call repeatedly
2131
if EINTR does occur. This is typically only true for low-level operations
2132
like os.read. If in any doubt, don't use this.
2134
Keep in mind that this is not a complete solution to EINTR. There is
2135
probably code in the Python standard library and other dependencies that
2136
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
2138
directly controls, but it is not a complete solution.
2042
"""Run f(*a, **kw), retrying if an EINTR error occurs."""
2140
2043
# Borrowed from Twisted's twisted.python.util.untilConcludes function.
added
removed
bzrlib/osutils.py
