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Implement a remote Repository.has_revision method.

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bzrlib/remote.py
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        if real_repository:
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            self._real_repository = real_repository
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        self.bzrdir = remote_bzrdir
 
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        self._client = client.SmartClient(self.bzrdir.client)
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        self._format = RemoteRepositoryFormat()
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    def has_revision(self, revision_id):
 
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        """See Repository.has_revision()."""
 
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        path = self.bzrdir._path_for_remote_call().encode('utf8')
 
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        response = self._client.call('Repository.has_revision', path, revision_id.encode('utf8'))
 
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        assert response[0] in ('ok', 'no'), 'unexpected response code %s' % response[0]
 
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        return response[0] == 'ok'
 
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class RemoteBranchFormat(branch.BranchFormat):
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