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Merge up bzr.dev.

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        :param path: Path to the lock within the base directory of the 
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            transport.
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        """
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        assert isinstance(transport, Transport), \
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            ("not a transport: %r" % transport)
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        self.transport = transport
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        self.path = path
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        self._lock_held = False
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        try:
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            info = self._read_info_file(self._held_info_path)
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            self._trace("peek -> held")
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            assert isinstance(info, dict), \
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                    "bad parse result %r" % info
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            return info
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        except NoSuchFile, e:
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            self._trace("peek -> not held")