    # File lib/fog/linode/requests/compute/avail_distributions.rb, line 15
            def avail_distributions(distribution_id=nil)
              options = {}
              if distribution_id
                options.merge!(:distributionId => distribution_id)
              end
              request(
                :expects  => 200,
                :method   => 'GET',
                :query    => { :api_action => 'avail.distributions' }.merge!(options)
              )
            end