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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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from stat import S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE
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from stat import (S_ISREG, S_ISDIR, S_ISLNK, ST_MODE, ST_SIZE,
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S_ISCHR, S_ISBLK, S_ISFIFO, S_ISSOCK)
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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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def relpath(base, path):
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"""Return path relative to base, or raise PathNotChild exception.
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"""Return path relative to base, or raise exception.
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The path may be either an absolute path or a path relative to the
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current working directory.
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os.path.commonprefix (python2.4) has a bad bug that it works just
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on string prefixes, assuming that '/u' is a prefix of '/u2'. This
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avoids that problem.
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NOTE: `base` should not have a trailing slash otherwise you'll get
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PathNotChild exceptions regardless of `path`.
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if len(base) < MIN_ABS_PATHLENGTH:
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False)`). May be ignored if the feature is not available on this
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platform or Python version.
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siginterrupt = signal.siginterrupt
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# This python implementation doesn't provide signal support, hence no
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except AttributeError:
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# siginterrupt doesn't exist on this platform, or for this version
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siginterrupt = lambda signum, flag: None
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old_handler = signal.signal(signum, handler)
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if restart_syscall:
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def sig_handler(*args):
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# Python resets the siginterrupt flag when a signal is
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# received. <http://bugs.python.org/issue8354>
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# As a workaround for some cases, set it back the way we want it.
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siginterrupt = signal.siginterrupt
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except AttributeError: # siginterrupt doesn't exist on this platform, or for this version of
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siginterrupt(signum, False)
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# Now run the handler function passed to set_signal_handler.
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sig_handler = handler
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old_handler = signal.signal(signum, sig_handler)
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siginterrupt(signum, False)
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return old_handler
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terminal_width() returns None.
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# Keep some state so that terminal_width can detect if _terminal_size has
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# returned a different size since the process started. See docstring and
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# comments of terminal_width for details.
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# _terminal_size_state has 3 possible values: no_data, unchanged, and changed.
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_terminal_size_state = 'no_data'
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_first_terminal_size = None
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def terminal_width():
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"""Return terminal width.
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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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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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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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# 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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return int(os.environ['COLUMNS'])
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except (KeyError, ValueError):
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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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width, height = _terminal_size(None, None)
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# Consider invalid values as meaning no width
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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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global _registered_sigwinch
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if not _registered_sigwinch:
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if sys.platform == 'win32':
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# Martin (gz) mentioned WINDOW_BUFFER_SIZE_RECORD from
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# ReadConsoleInput but I've no idea how to plug that in
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# the current design -- vila 20091216
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set_signal_handler(signal.SIGWINCH, _terminal_size_changed)
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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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real_handlers[kind](abspath, relpath)
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def copy_ownership_from_path(dst, src=None):
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def copy_ownership(dst, src=None):
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"""Copy usr/grp ownership from src file/dir to dst file/dir.
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If src is None, the containing directory is used as source. If chown
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trace.warning("Unable to copy ownership from '%s' to '%s': IOError: %s." % (src, dst, e))
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def mkdir_with_ownership(path, ownership_src=None):
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"""Create the directory 'path' with specified ownership.
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If ownership_src is given, copies (chown) usr/grp ownership
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from 'ownership_src' to 'path'. If ownership_src is None, use the
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containing dir ownership.
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copy_ownership(path, ownership_src)
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def open_with_ownership(filename, mode='r', bufsize=-1, ownership_src=None):
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"""Open the file 'filename' with the specified ownership.
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If ownership_src is specified, copy usr/grp ownership from ownership_src
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to filename. If ownership_src is None, copy ownership from containing
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Returns the opened file object.
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f = open(filename, mode, bufsize)
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copy_ownership(filename, ownership_src)
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def path_prefix_key(path):
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"""Generate a prefix-order path key for path.
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base = dirname(bzrlib.__file__)
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if getattr(sys, 'frozen', None): # bzr.exe
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base = abspath(pathjoin(base, '..', '..'))
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f = file(pathjoin(base, resource_relpath), "rU")
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filename = pathjoin(base, resource_relpath)
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return open(filename, 'rU').read()
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def file_kind_from_stat_mode_thunk(mode):
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global file_kind_from_stat_mode
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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." % \
added
removed
bzrlib/osutils.py
