here we go

hosts/common/default.nix

@@ -0,0 +1,64 @@
+# Common configuration for all hosts
+{
+  config,
+  pkgs,
+  lib,
+  inputs,
+  outputs,
+  ...
+}: {
+  imports = [
+    ./extraServices
+    ./users
+    inputs.home-manager.nixosModules.home-manager
+  ];
+
+  home-manager = {
+    useUserPackages = true;
+    extraSpecialArgs = {inherit inputs outputs;};
+  };
+  nixpkgs = {
+    # You can add overlays here
+    overlays = [
+      # Add overlays your own flake exports (from overlays and pkgs dir):
+      outputs.overlays.additions
+      outputs.overlays.modifications
+      outputs.overlays.stable-packages
+
+      # You can also add overlays exported from other flakes:
+      # neovim-nightly-overlay.overlays.default
+
+      # Or define it inline, for example:
+      # (final: prev: {
+      #   hi = final.hello.overrideAttrs (oldAttrs: {
+      #     patches = [ ./change-hello-to-hi.patch ];
+      #   });
+      # })
+    ];
+    # Configure your nixpkgs instance
+    config = {
+      # Disable if you don't want unfree packages
+      allowUnfree = true;
+    };
+  };
+
+  nix = {
+    settings = {
+      experimental-features = "nix-command flakes";
+      trusted-users = [
+        "root"
+        "m3tam3re"
+      ]; # Set users that are allowed to use the flake command
+    };
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 30d";
+    };
+    optimise.automatic = true;
+    registry =
+      (lib.mapAttrs (_: flake: {inherit flake;}))
+      ((lib.filterAttrs (_: lib.isType "flake")) inputs);
+    nixPath = ["/etc/nix/path"];
+  };
+  users.defaultUserShell = pkgs.fish;
+}