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merge bzr.dev.

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bzrlib/osutils.py
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O_BINARY = getattr(os, 'O_BINARY', 0)
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def get_unicode_argv():
 
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    try:
 
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        user_encoding = get_user_encoding()
 
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        return [a.decode(user_encoding) for a in sys.argv[1:]]
 
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    except UnicodeDecodeError:
 
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        raise errors.BzrError(("Parameter '%r' is unsupported by the current "
 
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                                                            "encoding." % a))
 
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def make_readonly(filename):
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    """Make a filename read-only."""
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    mod = os.lstat(filename).st_mode
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    def rmtree(path, ignore_errors=False, onerror=_win32_delete_readonly):
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        """Replacer for shutil.rmtree: could remove readonly dirs/files"""
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        return shutil.rmtree(path, ignore_errors, onerror)
 
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    f = win32utils.get_unicode_argv     # special function or None
 
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    if f is not None:
 
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        get_unicode_argv = f
 
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elif sys.platform == 'darwin':
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    getcwd = _mac_getcwd
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