OpenNebula

There is a command for updating the value of an attribute and removing the attribute, but there is no command for adding a new one.

• addattr (Add a new image attribute)
  oneimage addattr <image_id> <attribute_name> <attribute_value>

when "addattr" 
    check_parameters("addattr", 3)
    image_id=get_image_id(ARGV[0])

    image=OpenNebula::Image.new_with_id(image_id, get_one_client)

    result=image.update(ARGV[1],ARGV[2])
    if is_successful?(result)
        puts "Modified image" if ops[:verbose]
    end