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617
if self._new_pack is not None:
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raise errors.BzrError('call to create_pack_from_packs while '
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619
'another pack is being written.')
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new_pack = NewPack(self._upload_transport, self._index_transport,
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self._pack_transport, upload_suffix=suffix)
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# buffer data - we won't be reading-back during the pack creation and