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# Copyright (C) 2005-2010 Canonical Ltd
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# Copyright (C) 2005-2011 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# a similar effect.
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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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# data at once.
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MAX_SOCKET_CHUNK = 64 * 1024
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_end_of_stream_errors = [errno.ECONNRESET]
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for _eno in ['WSAECONNRESET', 'WSAECONNABORTED']:
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_eno = getattr(errno, _eno, None)
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if _eno is not None:
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_end_of_stream_errors.append(_eno)
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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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bytes = sock.recv(max_read_size)
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except socket.error, e:
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eno = e.args[0]
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if eno == getattr(errno, "WSAECONNRESET", errno.ECONNRESET):
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if eno in _end_of_stream_errors:
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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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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):