vars/interface: make type of dependencies configurable

One vars get lifted to the global scope, dependencies need to be structured differently, eg. categorized by instances

nixosModules/clanCore/vars/default.nix

@@ -26,6 +26,7 @@ in
     ++ lib.optionals (_class == "nixos") [
       ./secret/password-store.nix
     ];
+
   options.clan.core.vars = lib.mkOption {
     description = ''
       Generated Variables
@@ -36,7 +37,14 @@ in
         - generate secrets like private keys automatically when they are needed
         - output multiple values like private and public keys simultaneously
     '';
-    type = submodule { imports = [ ./interface.nix ]; };
+    type = submodule {
+      imports = [
+        ./interface.nix
+        {
+          settings.dependenciesType = lib.types.listOf lib.types.str;
+        }
+      ];
+    };
   };
 
   config = {

nixosModules/clanCore/vars/interface.nix

@@ -68,7 +68,6 @@ in
               default = generator.config._module.args.name;
               defaultText = "Name of the generator";
             };
-
             dependencies = mkOption {
               description = ''
                 A list of other generators that this generator depends on.
@@ -78,7 +77,7 @@ in
 
                 **A file `file1` of a generator named `dep1` will be available via `$in/dep1/file1`**
               '';
-              type = listOf str;
+              type = config.settings.dependenciesType;
               default = [ ];
             };
             migrateFact = mkOption {

nixosModules/clanCore/vars/settings-opts.nix

@@ -65,4 +65,14 @@
       Set it to pkgs.pass for GPG or pkgs.passage for age encryption.
     '';
   };
+
+  dependenciesType = lib.mkOption {
+    type = lib.types.raw;
+    description = ''
+      The type of the `dependencies` option.
+    '';
+    internal = true;
+    readOnly = true;
+    visible = false;
+  };
 }