# File lib/fog/libvirt/models/compute/volumes.rb, line 57
        def get_by_key(key)
          connection.raw.list_storage_pools.each do |poolname|
            pool=connection.raw.lookup_storage_pool_by_name(poolname)
            volume=pool.lookup_volume_by_key(key)
            unless volume.nil?
              return  volume
            end
          end

          return nil
        end