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merge bzr.dev r4154

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bzrlib/transport/remote.py
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            should only be used for testing purposes; normally this is
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            determined from the medium.
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        """
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        super(RemoteTransport, self).__init__(url,
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                                              _from_transport=_from_transport)
 
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        super(RemoteTransport, self).__init__(
 
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            url, _from_transport=_from_transport)
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        # The medium is the connection, except when we need to share it with
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        # other objects (RemoteBzrDir, RemoteRepository etc). In these cases
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        # what we want to share is really the shared connection.
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        if _from_transport is None:
 
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        if (_from_transport is not None
 
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            and isinstance(_from_transport, RemoteTransport)):
 
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            _client = _from_transport._client
 
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        elif _from_transport is None:
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            # If no _from_transport is specified, we need to intialize the
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            # shared medium.
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            credentials = None
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        # No credentials
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        return None, None
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    def _report_activity(self, bytes, direction):
 
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        """See Transport._report_activity.
 
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        Does nothing; the smart medium will report activity triggered by a
 
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        RemoteTransport.
 
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        """
 
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        pass
 
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    def is_readonly(self):
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        """Smart server transport can do read/write file operations."""
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        try: