class ChefCLI::Policyfile::SolutionDependencies

def transitive_deps(names)
  deps = Set.new
  to_explore = names.dup
  until to_explore.empty?
    ck_name = to_explore.shift
    next unless deps.add?(ck_name) # explore each ck only once
    my_deps = find_cookbook_dep_by_name(ck_name)
    dep_names = my_deps[1].map(&:first)
    to_explore += dep_names
  end
  deps.to_a.sort
end