trivionomicon/flake: make 'mkSystem' available to library users

flake.nix

@@ -164,24 +164,12 @@
           }
           // optionalAttrs (paths ? nixosSource) {
             nixosConfigurations = let
-              nixosSystem = {modules}:
-                lib.makeOverridable nixpkgs.lib.nixosSystem {
-                  inherit modules pkgs system;
-
-                  specialArgs = {
-                    inherit flakes;
-
-                    doctrine = mkDoctrine {
-                      inherit pkgs;
-                      namespace = "sys";
-                    };
-                  };
-                };
-
               hostConfig = platform:
-                nixosSystem {
+                self.lib.mkSystem {
+                  inherit flakes pkgs;
+                  doctrine = doctrineNoPkgs;
+
                   modules = [
-                    self.nixosModules.default
                     nixosSourcePath
                     platform
                   ];
@@ -213,6 +201,29 @@
             in
               lib.mapAttrs home (importAll {root = hmPlatformsPath;});
           };
+
+        mkSystem = {
+          pkgs,
+          flakes,
+          doctrine,
+          modules,
+        }:
+          flakes.nixpkgs.lib.makeOverridable flakes.nixpkgs.lib.nixosSystem {
+            inherit pkgs;
+            inherit (pkgs) system;
+
+            modules = [self.nixosModules.default] ++ modules;
+
+            specialArgs = {
+              inherit flakes;
+
+              doctrine = self.lib.mkDoctrine {
+                inherit pkgs;
+                inherit (doctrine) prefix;
+                namespace = "sys";
+              };
+            };
+          };
       };
     };
 }