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bzrlib/revision.py
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        return self.properties.get('author', self.committer)
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@deprecated_function(symbol_versioning.zero_ninetythree)
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def is_ancestor(revision_id, candidate_id, branch):
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    """Return true if candidate_id is an ancestor of revision_id.
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    revisions_source is an object supporting a get_revision operation that
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    behaves like Branch's.
 
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    This function is deprecated, it is better for callers to directly use
 
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    Graph.is_ancestor() (just watch out that the parameter order is switched)
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    """
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    if is_null(candidate_id):
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        return True
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    return (candidate_id in branch.repository.get_ancestry(revision_id,
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            topo_sorted=False))
 
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    return branch.repository.get_graph().is_ancestor(candidate_id, revision_id)
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def iter_ancestors(revision_id, revision_source, only_present=False):