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revision_id = tree.get_file_revision(root_id, u"")
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revision_root[revision_id] = root_id
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# Find out which parents we don't already know root ids for
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# Limit to revisions present in the versionedfile
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for tree in self.iter_rev_trees(parents):
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root_id = tree.get_root_id()
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revision_root[tree.get_revision_id()] = root_id