setup repo structure (& test system config)

systems/default.nix

@@ -0,0 +1,41 @@
+{ flake }:
+let
+  nixpkgs = flake.inputs.nixpkgs;
+
+  # utility function to create a new nixos configuration
+  # call like `mkSystem "x86_64-linux" "<hostname>.eh22.intern"`
+  mkSystem =
+    systemType: name:
+    nixpkgs.lib.nixosSystem {
+      system = systemType;
+      specialArgs = flake.inputs;
+      modules = [
+        flake.inputs.home-manager.nixosModules.home-manager
+        flake.inputs.sops-nix.nixosModules.default
+        flake.inputs.lix.nixosModules.lixFromNixpkgs
+
+        ../modules/base_system.nix
+        ../modules/user_account.nix
+        #../modules/mail_relay.nix
+        ./${name}.nix
+
+        (
+          let
+            fqdnParts = nixpkgs.lib.strings.splitString "." name;
+          in
+          {
+            networking.hostName = builtins.head fqdnParts;
+            networking.domain =
+              if ((builtins.length fqdnParts) > 1) then
+                (builtins.concatStringsSep "." (builtins.tail fqdnParts))
+              else
+                null;
+          }
+        )
+      ];
+    };
+in
+{
+  # exposed hosts at myroot
+  "test.eh22.intern" = mkSystem "x86_64-linux" "test.eh22.intern";
+}