feat(plasma): enable KDE remote desktop

homes/x86_64-linux/philipp@bodenheizung/default.nix

@@ -1,10 +1,15 @@
 {
   lib,
+  pkgs,
   namespace,
   ...
 }:
 with lib.${namespace};
 {
+  home.activation.disableKrdpAutostart = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    ${pkgs.kdePackages.kconfig}/bin/kwriteconfig6 --file krdpserverrc --group General --key Autostart false
+  '';
+
   ${namespace} = {
     cli = {
       fish = enabled;

modules/nixos/desktop/plasma/default.nix

@@ -12,13 +12,23 @@ let
 
   excludePackages = with pkgs.kdePackages; [
     elisa
-    krdp
   ];
 in
 {
   options.${namespace}.desktop.plasma = with types; {
     enable = mkBoolOpt false "Whether or not to use Plasma as the desktop environment.";
     extraExcludePackages = mkOpt (listOf package) [ ] "Extra packages to exclude";
+
+    remoteDesktop = {
+      enable = mkBoolOpt false "Whether to enable KDE Remote Desktop via KRdp.";
+      disableH264 = mkBoolOpt true "Whether to disable H.264 encoding for KRdp to improve Windows RDP compatibility.";
+      monitor =
+        mkOpt (nullOr int) 0
+          "The monitor index to stream via KRdp. Set to null to let KRdp choose.";
+      openFirewall = mkBoolOpt true "Whether to open the RDP port in the firewall.";
+      port = mkOpt port 3389 "RDP port for KDE Remote Desktop.";
+      usePlasmaProtocol = mkBoolOpt true "Whether to use KRdp's Plasma screencasting protocol instead of the XDG desktop portal.";
+    };
   };
 
   config = mkIf cfg.enable {
@@ -39,10 +49,47 @@ in
       };
     };
 
-    environment.plasma6.excludePackages = excludePackages ++ cfg.extraExcludePackages;
+    environment.plasma6.excludePackages =
+      excludePackages
+      ++ optional (!cfg.remoteDesktop.enable) pkgs.kdePackages.krdp
+      ++ cfg.extraExcludePackages;
 
     programs.kdeconnect.enable = true;
 
+    environment.sessionVariables = mkIf (cfg.remoteDesktop.enable && cfg.remoteDesktop.disableH264) {
+      KRDP_DISABLE_H264 = "1";
+    };
+
+    systemd.user.services."app-org.kde.krdpserver" = mkIf cfg.remoteDesktop.enable {
+      description = "KRDP Server";
+      environment = optionalAttrs cfg.remoteDesktop.disableH264 {
+        KRDP_DISABLE_H264 = "1";
+      };
+      after = [
+        "plasma-core.target"
+        "plasma-xdg-desktop-portal-kde.service"
+      ];
+      wantedBy = [ "plasma-workspace.target" ];
+
+      serviceConfig = {
+        Type = "exec";
+        ExecStart = concatStringsSep " " (
+          [
+            "${pkgs.kdePackages.krdp}/bin/krdpserver"
+            "--port"
+            (toString cfg.remoteDesktop.port)
+          ]
+          ++ optional (cfg.remoteDesktop.monitor != null) "--monitor ${toString cfg.remoteDesktop.monitor}"
+          ++ optional cfg.remoteDesktop.usePlasmaProtocol "--plasma"
+        );
+        Restart = "on-abnormal";
+      };
+    };
+
+    networking.firewall = mkIf (cfg.remoteDesktop.enable && cfg.remoteDesktop.openFirewall) {
+      allowedTCPPorts = [ cfg.remoteDesktop.port ];
+    };
+
     networking.networkmanager = {
       enable = true;
       plugins = with pkgs; [

systems/x86_64-linux/bodenheizung/default.nix

@@ -83,7 +83,10 @@ with lib.${namespace};
       steam = enabled;
     };
 
-    desktop.plasma = enabled;
+    desktop.plasma = {
+      enable = true;
+      remoteDesktop = enabled;
+    };
     hardware.audio = enabled;
 
     services = {