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def dfetch_refs(self, update_refs):
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"""Import the gist of the ancestry of a particular revision."""
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def determine_wants(old_refs):
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self.old_refs = dict([(k, (v, None)) for (k, v) in old_refs.iteritems()])
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self.new_refs = update_refs(self.old_refs)
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for name, (gitid, revid) in self.new_refs.iteritems():