dumb-manager lol

flake.nix

···
             }
           )
         );
+      dumb-manager = import ./lib/dumb-manager.nix;
     in
     {
       nixosConfigurations = {
···
         };
       };
       packages = forAllSystems (pkgs: {
-        # Too lazy to do callPackage...
-        mac-home = (import ./home/mac) pkgs;
+        # mac-home = (import ./home/mac) {inherit pkgs;};
+        mac-home = dumb-manager.configuration {
+          inherit pkgs nixpkgs;
+          module = ./home/mac;
+        };
       });
+      # apps = forAllSystems (pkgs: {
+      #   update-links = {
+      #     type = "app";
+      #     program = "${self.packages.${pkgs.system}.update-links}";
+      #   };
+      # });
       formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
     };
 }

home/mac/default.nix

···
-pkgs:
-
-pkgs.buildEnv {
-  name = "mac-home";
-  paths = with pkgs; [
+{ pkgs }:
+{
+  username = "user";
+  homeDirectory = "/Users/user";
+  packages = with pkgs; [
     zig
     flashrom
     tree

lib/dumb-manager.nix

···
+{
+  configuration =
+    {
+      pkgs,
+      nixpkgs,
+      module,
+    }:
+    let
+      cfg = (import module) { inherit pkgs; };
+      inherit (cfg) homeDirectory;
+      update-links = import ./update-links.nix;
+      packages = (cfg.packages or [ ]) ++ [
+        (update-links { inherit pkgs nixpkgs homeDirectory; })
+      ];
+    in
+    pkgs.buildEnv {
+      name = "dumb-manager";
+      paths = packages;
+    };
+}

lib/update-links.nix

···
+{
+  nixpkgs,
+  pkgs,
+  homeDirectory,
+}:
+let
+  registry = {
+    flakes = [
+      {
+        exact = true;
+        from = {
+          id = "n";
+          type = "indirect";
+        };
+        to = {
+          path = "${nixpkgs}";
+          type = "path";
+        };
+      }
+    ];
+    version = 2;
+  };
+  registryFile = pkgs.writeTextFile {
+    name = "registry.json";
+    destination = "/.config/nix/registry.json";
+    text = builtins.toJSON registry;
+  };
+in
+pkgs.writeShellScriptBin "update-links" ''
+  #!/usr/bin/env bash
+  mkdir -p ${homeDirectory}/.config/nix
+  ln -sf ${registryFile}/.config/nix/registry.json ${homeDirectory}/.config/nix/registry.json
+''