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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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# be opened in binary mode, rather than text mode.
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# On other platforms, O_BINARY doesn't exist, because
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# they always open in binary mode, so it is okay to
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# OR with 0 on those platforms.
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# O_NOINHERIT and O_TEXT exists only on win32 too.
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# OR with 0 on those platforms
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O_BINARY = getattr(os, 'O_BINARY', 0)
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O_TEXT = getattr(os, 'O_TEXT', 0)
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O_NOINHERIT = getattr(os, 'O_NOINHERIT', 0)
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def get_unicode_argv():
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normalized_filename = _inaccessible_normalized_filename
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def set_signal_handler(signum, handler, restart_syscall=True):
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"""A wrapper for signal.signal that also calls siginterrupt(signum, False)
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on platforms that support that.
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:param restart_syscall: if set, allow syscalls interrupted by a signal to
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automatically restart (by calling `signal.siginterrupt(signum,
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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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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(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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default_terminal_width = 80
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"""The default terminal width for ttys.
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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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if sys.platform == 'win32':
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# Martin (gz) mentioned WINDOW_BUFFER_SIZE_RECORD from ReadConsoleInput but
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# I've no idea how to plug that in the current design -- vila 20091216
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signal.signal(signal.SIGWINCH, _terminal_size_changed)
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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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"""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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fails, the error is ignored and a warning is printed.
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chown = getattr(os, 'chown', None)
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src = os.path.dirname(dst)
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chown(dst, s.st_uid, s.st_gid)
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trace.warning("Unable to copy ownership from '%s' to '%s': IOError: %s." % (src, dst, e))
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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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return socket.gethostname().decode(get_user_encoding())
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# We must not read/write any more than 64k at a time from/to a socket so we
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# don't risk "no buffer space available" errors on some platforms. Windows in
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# particular is likely to throw WSAECONNABORTED or WSAENOBUFS if given too much
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MAX_SOCKET_CHUNK = 64 * 1024
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def read_bytes_from_socket(sock, report_activity=None,
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max_read_size=MAX_SOCKET_CHUNK):
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"""Read up to max_read_size of bytes from sock and notify of progress.
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Translates "Connection reset by peer" into file-like EOF (return an
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empty string rather than raise an error), and repeats the recv if
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interrupted by a signal.
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bytes = sock.recv(max_read_size)
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except socket.error, e:
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if eno == getattr(errno, "WSAECONNRESET", errno.ECONNRESET):
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# The connection was closed by the other side. Callers expect
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# an empty string to signal end-of-stream.
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elif eno == errno.EINTR:
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# Retry the interrupted recv.
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if report_activity is not None:
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report_activity(len(bytes), 'read')
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def recv_all(socket, count):
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def recv_all(socket, bytes):
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"""Receive an exact number of bytes.
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Regular Socket.recv() may return less than the requested number of bytes,
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depending on what's in the OS buffer. MSG_WAITALL is not available
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dependning on what's in the OS buffer. MSG_WAITALL is not available
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on all platforms, but this should work everywhere. This will return
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less than the requested amount if the remote end closes.
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This isn't optimized and is intended mostly for use in testing.
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while len(b) < count:
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new = read_bytes_from_socket(socket, None, count - len(b))
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while len(b) < bytes:
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new = until_no_eintr(socket.recv, bytes - len(b))
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def send_all(sock, bytes, report_activity=None):
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def send_all(socket, bytes, report_activity=None):
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"""Send all bytes on a socket.
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Breaks large blocks in smaller chunks to avoid buffering limitations on
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some platforms, and catches EINTR which may be thrown if the send is
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interrupted by a signal.
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This is preferred to socket.sendall(), because it avoids portability bugs
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and provides activity reporting.
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Regular socket.sendall() can give socket error 10053 on Windows. This
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implementation sends no more than 64k at a time, which avoids this problem.
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:param report_activity: Call this as bytes are read, see
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Transport._report_activity
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byte_count = len(bytes)
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while sent_total < byte_count:
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sent = sock.send(buffer(bytes, sent_total, MAX_SOCKET_CHUNK))
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except socket.error, e:
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if e.args[0] != errno.EINTR:
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report_activity(sent, 'write')
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for pos in xrange(0, len(bytes), chunk_size):
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block = bytes[pos:pos+chunk_size]
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if report_activity is not None:
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report_activity(len(block), 'write')
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until_no_eintr(socket.sendall, block)
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def dereference_path(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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def until_no_eintr(f, *a, **kw):
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"""Run f(*a, **kw), retrying if an EINTR error occurs.
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WARNING: you must be certain that it is safe to retry the call repeatedly
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if EINTR does occur. This is typically only true for low-level operations
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like os.read. If in any doubt, don't use this.
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Keep in mind that this is not a complete solution to EINTR. There is
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probably code in the Python standard library and other dependencies that
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may encounter EINTR if a signal arrives (and there is signal handler for
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that signal). So this function can reduce the impact for IO that bzrlib
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directly controls, but it is not a complete solution.
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"""Run f(*a, **kw), retrying if an EINTR error occurs."""
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# Borrowed from Twisted's twisted.python.util.untilConcludes function.
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data, _ = self.encode(object, self.errors)
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self.stream.write(data)
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if sys.platform == 'win32':
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def open_file(filename, mode='r', bufsize=-1):
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"""This function is used to override the ``open`` builtin.
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But it uses O_NOINHERIT flag so the file handle is not inherited by
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child processes. Deleting or renaming a closed file opened with this
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function is not blocking child processes.
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writing = 'w' in mode
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appending = 'a' in mode
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updating = '+' in mode
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binary = 'b' in mode
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# see http://msdn.microsoft.com/en-us/library/yeby3zcb%28VS.71%29.aspx
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# for flags for each modes.
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flags |= os.O_WRONLY
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flags |= os.O_CREAT | os.O_TRUNC
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flags |= os.O_WRONLY
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flags |= os.O_CREAT | os.O_APPEND
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flags |= os.O_RDONLY
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return os.fdopen(os.open(filename, flags), mode, bufsize)
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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
