update check

lib.nix

@@ -50,7 +50,9 @@ in
     in
     pkgs.writeShellApplication {
       inherit name;
-      text = checks ++ ''
+      text =
+        checks
+        + ''
           PC_CONFIG_FILES=${configFile} ${pkgs.process-compose}/bin/process-compose "$@"
 
         '';
@@ -87,17 +89,17 @@ in
         else if false == value then
           "no"
         else if lib.isString value then
-          "'${lib.replaceStrings [ "'" ] [ "''" value ]}'"
+          "'${lib.replaceStrings [ "'" ] [ "''" ] value}'"
         else
           builtins.toString value;
       configFile = pkgs.writeTextDir "postgresql.conf" (
-        lib.concatStringSep "\n" (
+        lib.concatStringsSep "\n" (
-          lib.mapAttrsToList (n: v: "${n} = ${toStr v}") (lib.filterAttrs (
+          lib.mapAttrsToList (n: v: "${n} = ${toStr v}") (
-            lib.const (x: x != null)
+            lib.filterAttrs (lib.const (x: x != null)) merged_config
-          )) merged_config
+          )
         )
       );
-      configFileCheck = pkgs.writeShellScript {
+      configFileCheck = pkgs.writeShellApplication {
         name = "check";
         text = ''
           ${package}/bin/postgres -D${configFile} -C config_file