class ChefCLI::Policyfile::DSL

def cookbook(name, *version_and_source_opts)
  source_options =
    if version_and_source_opts.last.is_a?(Hash)
      version_and_source_opts.pop
    else
      {}
    end
  constraint = version_and_source_opts.first || ">= 0.0.0"
  spec = CookbookLocationSpecification.new(name, constraint, source_options, storage_config)
  if ( existing_source = @cookbook_location_specs[name] )
    err = "Cookbook '#{name}' assigned to conflicting sources\n\n"
    err << "Previous source: #{existing_source.source_options.inspect}\n"
    err << "Conflicts with: #{source_options.inspect}\n"
    @errors << err
  else
    @cookbook_location_specs[name] = spec
    @errors += spec.errors
  end
end