ChefAttributesByTagsDemo

attributes.rb

default['cookbook']['services']['service1']['source_url'] = 'https://example.com/s1'
default['cookbook']['services']['service2']['source_url'] = 'https://example.com/s2'
default['cookbook']['services']['service3']['source_url'] = 'https://example.com/s3'


default['cookbook']['base_service_set'] = []
default['cookbook']['service_set'] = []

tag_reader_recipe.rb

service_set_array = node['cookbook']['base_service_set'].to_array

tagselector = 'taggedservice:'
tagset = (node[:tags].select { |t| t.starts_with?(tagselector) }).collect { |t| t[length(tagseelctor)..-1] }
tagset.each do |tagval|
  service_set_array.append(tagval)
end

node.normal['cookbook']['service_set'] = service_set_array

I got lazy here because I didn't want to keep writing the example out, but the idea is that you could designate 'service1', 'service2', and 'service3' with tags, and then read the contents of node['cookbook']['service_set'] to power some logic which uses their various 'source_url' attributes