add screen rotation

mum/configuration.nix

@@ -5,10 +5,10 @@
 { config, pkgs, ... }:
 
 {
-  imports =
-    [ # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-    ];
+  imports = [
+    # Include the results of the hardware scan.
+    ./hardware-configuration.nix
+  ];
 
   # Bootloader.
   boot.loader.grub.enable = true;
@@ -56,8 +56,11 @@
   users.users.kemp = {
     isNormalUser = true;
     description = "kemp";
-    extraGroups = [ "networkmanager" "wheel" ];
-    packages = with pkgs; [];
+    extraGroups = [
+      "networkmanager"
+      "wheel"
+    ];
+    packages = with pkgs; [ ];
 
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINGHadFhDCUU/ta3p1FQgpm7NExHkyHNrJbNJP6np5w9 kempinger@ins.jku.at"
@@ -76,32 +79,43 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
-  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
-  #  wget
-  git
-  nil
-  nixd
+    #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+    #  wget
+    git
+    nil
+    nixd
+    wlr-randr
+    kmsxx
   ];
   programs.firefox = {
     enable = true;
   };
 
-
-  systemd.services.cage-tty1={
+  systemd.services.cage-tty1 = {
     after = [
-    "network-online.target"
-    #"systemd-resolved.service"
-  ];serviceConfig = {
-    Restart = "always";
-    RestartSec = "1s";
-  };
-  environment.XKB_DEFAULT_LAYOUT = "de";
+      "network-online.target"
+      #"systemd-resolved.service"
+    ];
+    serviceConfig = {
+      Restart = "always";
+      RestartSec = "1s";
+    };
+    environment.XKB_DEFAULT_LAYOUT = "de";
   };
 
   services.cage = {
     enable = true;
     user = "kemp";
-    program = "${pkgs.firefox}/bin/firefox";
+    program = "${pkgs.writeScriptBin "start-cage-app" ''
+      #!/usr/bin/env bash
+      kmsprint |
+        grep '(connected)' |
+        sed -E 's/.* ([^ ]+) \(connected\).*/\1/' |
+        while read -r output; do
+          wlr-randr --output "$output" --transform 180
+        done
+      exec ${pkgs.firefox}/bin/firefox
+    ''}/bin/start-cage-app";
   };
   services.getty.loginProgram = "${pkgs.coreutils}/bin/true";