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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from datetime import datetime
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from ntpath import (abspath as _nt_abspath,
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normpath as _nt_normpath,
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realpath as _nt_realpath,
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splitdrive as _nt_splitdrive,
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# We need to import both shutil and rmtree as we export the later on posix
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# and need the former on windows
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from shutil import rmtree
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# We need to import both tempfile and mkdtemp as we export the later on posix
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# and need the former on windows
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from tempfile import (
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from tempfile import mkdtemp
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from bzrlib import (
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mod = os.lstat(filename).st_mode
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if not stat.S_ISLNK(mod):
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mod = mod & 0777555
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os.chmod(filename, mod)
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chmod_if_possible(filename, mod)
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def make_writable(filename):
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mod = os.lstat(filename).st_mode
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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.
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# Sometimes even on unix the filesystem won't allow it - see
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# https://bugs.launchpad.net/bzr/+bug/606537
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# It is probably faster to just do the chmod, rather than
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# doing a stat, and then trying to compare
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os.chmod(filename, mode)
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except (IOError, OSError),e:
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# Permission/access denied seems to commonly happen on smbfs; there's
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# probably no point warning about it.
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# <https://bugs.launchpad.net/bzr/+bug/606537>
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if getattr(e, 'errno') in (errno.EPERM, errno.EACCES):
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trace.mutter("ignore error on chmod of %r: %r" % (
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def minimum_path_selection(paths):
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# copy posixpath.abspath, but use os.getcwdu instead
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if not posixpath.isabs(path):
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path = posixpath.join(getcwd(), path)
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return posixpath.normpath(path)
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return _posix_normpath(path)
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def _posix_realpath(path):
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return posixpath.realpath(path.encode(_fs_enc)).decode(_fs_enc)
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def _posix_normpath(path):
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path = posixpath.normpath(path)
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# Bug 861008: posixpath.normpath() returns a path normalized according to
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# the POSIX standard, which stipulates (for compatibility reasons) that two
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# leading slashes must not be simplified to one, and only if there are 3 or
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# more should they be simplified as one. So we treat the leading 2 slashes
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# as a special case here by simply removing the first slash, as we consider
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# that breaking POSIX compatibility for this obscure feature is acceptable.
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# This is not a paranoid precaution, as we notably get paths like this when
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# the repo is hosted at the root of the filesystem, i.e. in "/".
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if path.startswith('//'):
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def _win32_fixdrive(path):
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"""Force drive letters to be consistent.
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running python.exe under cmd.exe return capital C:\\
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running win32 python inside a cygwin shell returns lowercase c:\\
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drive, path = _nt_splitdrive(path)
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drive, path = ntpath.splitdrive(path)
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return drive.upper() + path
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def _win32_abspath(path):
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# Real _nt_abspath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(_nt_abspath(unicode(path)).replace('\\', '/'))
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# Real ntpath.abspath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(ntpath.abspath(unicode(path)).replace('\\', '/'))
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def _win98_abspath(path):
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# /path => C:/path
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path = unicode(path)
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# check for absolute path
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drive = _nt_splitdrive(path)[0]
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drive = ntpath.splitdrive(path)[0]
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if drive == '' and path[:2] not in('//','\\\\'):
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cwd = os.getcwdu()
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# we cannot simply os.path.join cwd and path
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# because os.path.join('C:','/path') produce '/path'
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# and this is incorrect
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if path[:1] in ('/','\\'):
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cwd = _nt_splitdrive(cwd)[0]
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cwd = ntpath.splitdrive(cwd)[0]
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path = cwd + '\\' + path
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return _win32_fixdrive(_nt_normpath(path).replace('\\', '/'))
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return _win32_fixdrive(ntpath.normpath(path).replace('\\', '/'))
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def _win32_realpath(path):
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# Real _nt_realpath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(_nt_realpath(unicode(path)).replace('\\', '/'))
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# Real ntpath.realpath doesn't have a problem with a unicode cwd
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return _win32_fixdrive(ntpath.realpath(unicode(path)).replace('\\', '/'))
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def _win32_pathjoin(*args):
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return _nt_join(*args).replace('\\', '/')
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return ntpath.join(*args).replace('\\', '/')
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def _win32_normpath(path):
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return _win32_fixdrive(_nt_normpath(unicode(path)).replace('\\', '/'))
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return _win32_fixdrive(ntpath.normpath(unicode(path)).replace('\\', '/'))
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def _win32_getcwd():
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input_encoding = getattr(sys.stdin, 'encoding', None)
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if not input_encoding:
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output_encoding = get_user_encoding()
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mutter('encoding stdout as osutils.get_user_encoding() %r',
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mutter('encoding stdout as osutils.get_user_encoding() %r',
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output_encoding = input_encoding
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mutter('encoding stdout as sys.stdin encoding %r', output_encoding)
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mutter('encoding stdout as sys.stdin encoding %r',
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mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
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mutter('encoding stdout as sys.stdout encoding %r', output_encoding)
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if output_encoding == 'cp0':
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# invalid encoding (cp0 means 'no codepage' on Windows)
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output_encoding = get_user_encoding()
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mutter('cp0 is invalid encoding.'
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mutter('cp0 is invalid encoding.'
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' encoding stdout as osutils.get_user_encoding() %r',
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# but for now, we haven't optimized...
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return [canonical_relpath(base, p) for p in paths]
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def decode_filename(filename):
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"""Decode the filename using the filesystem encoding
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If it is unicode, it is returned.
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Otherwise it is decoded from the the filesystem's encoding. If decoding
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fails, a errors.BadFilenameEncoding exception is raised.
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if type(filename) is unicode:
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return filename.decode(_fs_enc)
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except UnicodeDecodeError:
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raise errors.BadFilenameEncoding(filename, _fs_enc)
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def safe_unicode(unicode_or_utf8_string):
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"""Coerce unicode_or_utf8_string into unicode.
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- if BZR_COLUMNS is set, returns its value
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- if there is no controlling terminal, returns None
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- query the OS, if the queried size has changed since the last query,
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- if COLUMNS is set, returns its value,
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- if the OS has a value (even though it's never changed), return its value.
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From there, we need to query the OS to get the size of the controlling
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On Unices we query the OS by:
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- get termios.TIOCGWINSZ
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- if an error occurs or a negative value is obtained, returns None
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On Windows we query the OS by:
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- win32utils.get_console_size() decides,
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- returns None on error (provided default value)
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# Note to implementors: if changing the rules for determining the width,
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# make sure you've considered the behaviour in these cases:
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# - M-x shell in emacs, where $COLUMNS is set and TIOCGWINSZ returns 0,0.
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# - bzr log | less, in bash, where $COLUMNS not set and TIOCGWINSZ returns
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# - (add more interesting cases here, if you find any)
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# Some programs implement "Use $COLUMNS (if set) until SIGWINCH occurs",
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# but we don't want to register a signal handler because it is impossible
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# to do so without risking EINTR errors in Python <= 2.6.5 (see
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# <http://bugs.python.org/issue8354>). Instead we check TIOCGWINSZ every
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# time so we can notice if the reported size has changed, which should have
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# If BZR_COLUMNS is set, take it, user is always right
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# Except if they specified 0 in which case, impose no limit here
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return int(os.environ['BZR_COLUMNS'])
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width = int(os.environ['BZR_COLUMNS'])
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except (KeyError, ValueError):
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if width is not None:
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isatty = getattr(sys.stdout, 'isatty', None)
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if isatty is None or not isatty():
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if isatty is None or not isatty():
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# Don't guess, setting BZR_COLUMNS is the recommended way to override.
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# If COLUMNS is set, take it, the terminal knows better (even inside a
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# given terminal, the application can decide to set COLUMNS to a lower
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# value (splitted screen) or a bigger value (scroll bars))
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width, height = os_size = _terminal_size(None, None)
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global _first_terminal_size, _terminal_size_state
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if _terminal_size_state == 'no_data':
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_first_terminal_size = os_size
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_terminal_size_state = 'unchanged'
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elif (_terminal_size_state == 'unchanged' and
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_first_terminal_size != os_size):
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_terminal_size_state = 'changed'
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# If the OS claims to know how wide the terminal is, and this value has
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# ever changed, use that.
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if _terminal_size_state == 'changed':
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if width is not None and width > 0:
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# If COLUMNS is set, use it.
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return int(os.environ['COLUMNS'])
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except (KeyError, ValueError):
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width, height = _terminal_size(None, None)
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# Consider invalid values as meaning no width
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# Finally, use an unchanged size from the OS, if we have one.
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if _terminal_size_state == 'unchanged':
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if width is not None and width > 0:
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# The width could not be determined.
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def _win32_terminal_size(width, height):
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_terminal_size = _ioctl_terminal_size
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def _terminal_size_changed(signum, frame):
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"""Set COLUMNS upon receiving a SIGnal for WINdow size CHange."""
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width, height = _terminal_size(None, None)
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if width is not None:
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os.environ['COLUMNS'] = str(width)
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_registered_sigwinch = False
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def watch_sigwinch():
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"""Register for SIGWINCH, once and only once.
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Do nothing if the signal module is not available.
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global _registered_sigwinch
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if not _registered_sigwinch:
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if getattr(signal, "SIGWINCH", None) is not None:
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set_signal_handler(signal.SIGWINCH, _terminal_size_changed)
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# python doesn't provide signal support, nothing we can do about it
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_registered_sigwinch = True
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def supports_executable():
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return sys.platform != "win32"
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report_activity(sent, 'write')
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def connect_socket(address):
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# Slight variation of the socket.create_connection() function (provided by
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# python-2.6) that can fail if getaddrinfo returns an empty list. We also
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# provide it for previous python versions. Also, we don't use the timeout
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# parameter (provided by the python implementation) so we don't implement
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err = socket.error('getaddrinfo returns an empty list')
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host, port = address
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for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
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af, socktype, proto, canonname, sa = res
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sock = socket.socket(af, socktype, proto)
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except socket.error, err:
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# 'err' is now the most recent error
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if sock is not None:
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def dereference_path(path):
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"""Determine the real path to a file.
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termios.tcsetattr(fd, termios.TCSADRAIN, settings)
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if sys.platform == 'linux2':
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def _local_concurrency():
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prefix = 'processor'
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for line in file('/proc/cpuinfo', 'rb'):
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if line.startswith(prefix):
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concurrency = int(line[line.find(':')+1:]) + 1
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return os.sysconf('SC_NPROCESSORS_ONLN')
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except (ValueError, OSError, AttributeError):
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elif sys.platform == 'darwin':
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def _local_concurrency():
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return subprocess.Popen(['sysctl', '-n', 'hw.availcpu'],
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stdout=subprocess.PIPE).communicate()[0]
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elif sys.platform[0:7] == 'freebsd':
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elif "bsd" in sys.platform:
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def _local_concurrency():
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return subprocess.Popen(['sysctl', '-n', 'hw.ncpu'],
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stdout=subprocess.PIPE).communicate()[0]
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return os.fdopen(os.open(filename, flags), mode, bufsize)
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open_file = open
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def getuser_unicode():
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"""Return the username as unicode.
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user_encoding = get_user_encoding()
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username = getpass.getuser().decode(user_encoding)
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except UnicodeDecodeError:
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raise errors.BzrError("Can't decode username as %s." % \
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except ImportError, e:
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if sys.platform != 'win32':
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if str(e) != 'No module named pwd':
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# https://bugs.launchpad.net/bzr/+bug/660174
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# getpass.getuser() is unable to return username on Windows
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# if there is no USERNAME environment variable set.
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# That could be true if bzr is running as a service,
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# e.g. running `bzr serve` as a service on Windows.
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# We should not fail with traceback in this case.
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username = u'UNKNOWN'
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def available_backup_name(base, exists):
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"""Find a non-existing backup file name.
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This will *not* create anything, this only return a 'free' entry. This
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should be used for checking names in a directory below a locked
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tree/branch/repo to avoid race conditions. This is LBYL (Look Before You
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Leap) and generally discouraged.
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:param base: The base name.
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:param exists: A callable returning True if the path parameter exists.
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name = "%s.~%d~" % (base, counter)
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name = "%s.~%d~" % (base, counter)
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def set_fd_cloexec(fd):
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"""Set a Unix file descriptor's FD_CLOEXEC flag. Do nothing if platform
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support for this is not available.
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old = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
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except (ImportError, AttributeError):
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# Either the fcntl module or specific constants are not present
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def find_executable_on_path(name):
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"""Finds an executable on the PATH.
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On Windows, this will try to append each extension in the PATHEXT
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environment variable to the name, if it cannot be found with the name
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:param name: The base name of the executable.
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:return: The path to the executable found or None.
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path = os.environ.get('PATH')
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path = path.split(os.pathsep)
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if sys.platform == 'win32':
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exts = os.environ.get('PATHEXT', '').split(os.pathsep)
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exts = [ext.lower() for ext in exts]
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base, ext = os.path.splitext(name)
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if ext.lower() not in exts:
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f = os.path.join(d, name) + ext
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if os.access(f, os.X_OK):
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def _posix_is_local_pid_dead(pid):
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"""True if pid doesn't correspond to live process on this machine"""
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# Special meaning of unix kill: just check if it's there.
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if e.errno == errno.ESRCH:
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# On this machine, and really not found: as sure as we can be
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elif e.errno == errno.EPERM:
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# exists, though not ours
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mutter("os.kill(%d, 0) failed: %s" % (pid, e))
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# Don't really know.
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# Exists and our process: not dead.
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if sys.platform == "win32":
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is_local_pid_dead = win32utils.is_local_pid_dead
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is_local_pid_dead = _posix_is_local_pid_dead
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def fdatasync(fileno):
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"""Flush file contents to disk if possible.
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:param fileno: Integer OS file handle.
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:raises TransportNotPossible: If flushing to disk is not possible.
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fn = getattr(os, 'fdatasync', getattr(os, 'fsync', None))
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def ensure_empty_directory_exists(path, exception_class):
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"""Make sure a local directory exists and is empty.
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If it does not exist, it is created. If it exists and is not empty, an
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instance of exception_class is raised.
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if e.errno != errno.EEXIST:
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if os.listdir(path) != []:
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raise exception_class(path)