working on the stateless kiosk, dynamic hostnames not yet working

sw/stateless-kiosk/services.nix

@@ -0,0 +1,54 @@
+{ config, lib, pkgs, ... }:
+let
+  macCaseBuilder = (import ./mac-hostmap.nix { inherit lib; }).macCaseBuilder;
+  shellCases = macCaseBuilder {
+    varName = "NEW_HOST";
+    prefix = "nix-station";
+  };
+in
+{
+  services.xserver.enable = false;
+  services.seatd.enable = true;
+  services.openssh.enable = true;
+  services.dbus.enable = true;
+  security.polkit.enable = true;
+
+  services.displayManager = {
+    autoLogin = {
+      enable = true;
+      user = "engr-ugaif";
+    };
+
+    sddm = {
+      enable = true;
+      wayland.enable = true;
+    };
+
+    defaultSession = "sway";
+  };
+
+  systemd.services.dynamic-hostname = {
+    description = "Set hostname based on MAC address";
+    wantedBy = [ "sysinit.target" ];
+    wants = [ "default.target" ];
+    after = [ "default.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      ExecStart = pkgs.writeShellScript "dynamic-hostname" ''
+        set -euo pipefail
+
+        # Pick first non-loopback interface with a MAC
+        IFACE="$(ls /sys/class/net | grep -v '^lo$' | head -n1)"
+        MAC="$(cat /sys/class/net/$IFACE/address | tr '[:upper:]' '[:lower:]')"
+
+        case "$MAC" in
+          ${shellCases}
+          *) NEW_HOST="nix-station-unregistered" ;;
+        esac
+
+        ${pkgs.nettools}/bin/hostname "$NEW_HOST"
+      '';
+    };
+  };
+}