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def search_missing_revision_ids(self,
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find_ghosts=True, revision_ids=None, if_present_ids=None,
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"""See InterRepository.search_missing_revision_ids()."""
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source_ids_set = self._present_source_revisions_for(
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revision_ids, if_present_ids)
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# source_ids is the worst possible case we may need to pull.