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:param last_revision: If set, try to limit to the data this revision
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:param find_ghosts: If True search the entire history for ghosts.
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:param _write_group_acquired_callable: Don't use; this parameter only
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exists to facilitate a hack done in InterPackRepo.fetch. We would
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like to remove this parameter.
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if to_repository.has_same_location(from_repository):
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# repository.fetch should be taking care of this case.