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repository.py
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        """See Repository.get_ancestry().
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        """
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        if revision_id is None:
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            return self._all_revision_ids()
 
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            return [None, revision.NULL_REVISION] + self._all_revision_ids()
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        assert isinstance(revision_id, str)
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        ancestry = []
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        graph = self.get_graph()
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        for rev, parents in graph.iter_ancestry([revision_id]):
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            if rev == revision.NULL_REVISION:
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                rev = None
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            ancestry.append(rev)
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        ancestry.reverse()
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        return ancestry
 
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        return [None] + ancestry
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    def import_revision_gist(self, source, revid, parent_lookup):
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        """Impor the gist of another revision into this Git repository.