nix: check config via hakurei

This is unfortunately the only feasible way of doing this in nix.

Signed-off-by: Ophestra <cat@gensokyo.uk>

nixos.nix

@@ -204,11 +204,20 @@ in
                         ]
                       );
                     };
-
                   };
+
+                  checkedConfig =
+                    name: value:
+                    let
+                      file = pkgs.writeText name (builtins.toJSON value);
+                    in
+                    pkgs.runCommand "checked-${name}" { nativeBuildInputs = [ cfg.package ]; } ''
+                      ln -vs ${file} "$out"
+                      hakurei show ${file}
+                    '';
                 in
                 pkgs.writeShellScriptBin app.name ''
-                  exec hakurei${if app.verbose then " -v" else ""} app ${pkgs.writeText "hakurei-app-${app.name}.json" (builtins.toJSON conf)} $@
+                  exec hakurei${if app.verbose then " -v" else ""} app ${checkedConfig "hakurei-app-${app.name}.json" conf} $@
                 ''
               )
             ]

options.nix

@@ -3,47 +3,6 @@ packages:
 
 let
   inherit (lib) types mkOption mkEnableOption;
-
-  mountPoint =
-    let
-      inherit (types)
-        enum
-        str
-        submodule
-        nullOr
-        listOf
-        ;
-    in
-    listOf (submodule {
-      options = {
-        type = mkOption {
-          type = enum [ "bind" ];
-          default = "bind";
-          description = ''
-            Type of the mount point;
-          '';
-        };
-
-        dst = mkOption {
-          type = nullOr str;
-          default = null;
-          description = ''
-            Mount point in container, same as src if null.
-          '';
-        };
-
-        src = mkOption {
-          type = str;
-          description = ''
-            Host filesystem path to make available to the container.
-          '';
-        };
-
-        write = mkEnableOption "mounting path as writable";
-        dev = mkEnableOption "use of device files";
-        optional = mkEnableOption "ignore nonexistent source path";
-      };
-    });
 in
 
 {
@@ -243,7 +202,7 @@ in
               };
 
               extraPaths = mkOption {
-                type = mountPoint;
+                type = anything;
                 default = [ ];
                 description = ''
                   Extra paths to make available to the container.
@@ -301,7 +260,7 @@ in
       };
 
       commonPaths = mkOption {
-        type = mountPoint;
+        type = types.anything;
         default = [ ];
         description = ''
           Common extra paths to make available to the container.

test/sandbox/configuration.nix

@@ -78,6 +78,7 @@ in
 
     commonPaths = [
       {
+        type = "bind";
         src = "/var/cache";
         write = true;
       }