Add support for partitioning btrfs volumes

lib/modules/fileSystems.nix

@@ -94,7 +94,7 @@ in
             set -o errexit
             ${cfg.diskSetup.scripts.init}
             ${lib.strings.concatLines (lib.optionals ((builtins.length devices) > 0) [
-              ''echo $(tput setaf 3)=== WARNING ====$(jtput sgr0)"''
+              ''echo "$(tput setaf 3)=== WARNING ====$(tput sgr0)"''
               (''echo "Continuing this script will alter the partitions of ''
                 + (lib.strings.concatStringsSep ", " (builtins.map (_: "${_.deviceVariable}") (lib.lists.init devices)))
                 + (if (builtins.length devices) > 1 then " and " else "") + (lib.lists.last devices).deviceVariable + ''"'')