nixos: fix railbird-sf rebuild blockers

nixos/flake.nix

@@ -351,11 +351,9 @@
         system = "aarch64-linux";
       };
       railbird-sf = {
-        specialArgs = let
+        specialArgs = {
-          containerInfo = mkOrgAgendaApiContainerInfo "x86_64-linux";
+          orgAgendaApiContainer = null;
-        in {
+          orgAgendaApiImageName = "localhost/org-agenda-api:colonelpanic-dbb1cb8-030a673";
-          orgAgendaApiContainer = containerInfo.imageFile;
-          orgAgendaApiImageName = containerInfo.imageName;
         };
       };
     };

nixos/machines/railbird-sf.nix

@@ -1,4 +1,12 @@
-{ config, lib, pkgs, inputs, orgAgendaApiContainer ? null, orgAgendaApiImageName ? "org-agenda-api", ... }:
+{
+  config,
+  lib,
+  pkgs,
+  inputs,
+  orgAgendaApiContainer ? null,
+  orgAgendaApiImageName ? "localhost/org-agenda-api:colonelpanic-dbb1cb8-030a673",
+  ...
+}:
 {
   imports = [
     ../configuration.nix

nixos/remote-hyprland.nix

@@ -7,13 +7,47 @@ let
   remoteHyprlandStartVnc = pkgs.writeShellScript "remote-hyprland-start-vnc" ''
     set -euo pipefail
 
-    export WAYLAND_DISPLAY=${cfg.socket}
     export XDG_CURRENT_DESKTOP=Hyprland
     export XDG_SESSION_DESKTOP=Hyprland
     export XDG_SESSION_TYPE=wayland
+    export LIBSEAT_BACKEND=seatd
 
     for _ in $(${pkgs.coreutils}/bin/seq 1 50); do
-      if ${hyprlandPackage}/bin/hyprctl -j monitors >/dev/null 2>&1; then
+      instance="$(
+        ${hyprlandPackage}/bin/hyprctl instances \
+          | ${pkgs.gawk}/bin/awk '
+              /^instance / {
+                sig = $2
+                sub(/:$/, "", sig)
+              }
+              /^[[:space:]]*time:/ { time = $2 }
+              /^[[:space:]]*wl socket:/ {
+                if (sig != "" && time != "") {
+                  print time " " sig " " $3
+                }
+              }
+            ' \
+          | ${pkgs.coreutils}/bin/sort -n \
+          | ${pkgs.coreutils}/bin/tail -n 1
+      )"
+
+      if [ -n "$instance" ]; then
+        read -r _ HYPRLAND_INSTANCE_SIGNATURE WAYLAND_DISPLAY <<EOF
+$instance
+EOF
+        export HYPRLAND_INSTANCE_SIGNATURE WAYLAND_DISPLAY
+        break
+      fi
+      ${pkgs.coreutils}/bin/sleep 0.1
+    done
+
+    if [ -z "''${HYPRLAND_INSTANCE_SIGNATURE:-}" ] || [ -z "''${WAYLAND_DISPLAY:-}" ]; then
+      echo "Timed out waiting for a Hyprland instance" >&2
+      exit 1
+    fi
+
+    for _ in $(${pkgs.coreutils}/bin/seq 1 50); do
+      if ${hyprlandPackage}/bin/hyprctl -i "$HYPRLAND_INSTANCE_SIGNATURE" -j monitors >/dev/null 2>&1; then
         break
       fi
       ${pkgs.coreutils}/bin/sleep 0.1
@@ -21,8 +55,8 @@ let
 
     # Give wayvnc a stable output name instead of relying on Hyprland's
     # fallback HEADLESS-* naming.
-    ${hyprlandPackage}/bin/hyprctl output create headless ${cfg.output} >/dev/null 2>&1 || true
+    ${hyprlandPackage}/bin/hyprctl -i "$HYPRLAND_INSTANCE_SIGNATURE" output create headless ${cfg.output} >/dev/null 2>&1 || true
-    ${hyprlandPackage}/bin/hyprctl keyword monitor '${monitorRule}' >/dev/null 2>&1 || true
+    ${hyprlandPackage}/bin/hyprctl -i "$HYPRLAND_INSTANCE_SIGNATURE" keyword monitor '${monitorRule}' >/dev/null 2>&1 || true
 
     exec ${pkgs.wayvnc}/bin/wayvnc \
       --log-level=info \
@@ -100,35 +134,73 @@ let
     bind = $mainMod SHIFT, 8, movetoworkspace, 8
     bind = $mainMod SHIFT, 9, movetoworkspace, 9
 
-    exec-once = ${remoteHyprlandStartVnc}
     exec-once = ${cfg.terminalCommand}
   '';
+  servicePath = lib.makeBinPath [
+    pkgs.coreutils
+    pkgs.gnugrep
+    pkgs.gnused
+    pkgs.systemd
+  ];
+  autostartInstall = lib.optionalAttrs cfg.autoStart {
+    Install = {
+      WantedBy = [ "default.target" ];
+    };
+  };
   enabledModule = makeEnable config "myModules.remote-hyprland" false {
     myModules.hyprland.enable = true;
 
+    services.seatd = {
+      enable = true;
+      group = "video";
+    };
+
     users.manageLingering = true;
     users.users.${cfg.user}.linger = true;
 
     environment.systemPackages = [ pkgs.wayvnc ];
 
-    home-manager.users.${cfg.user}.systemd.user.services.remote-hyprland = {
+    home-manager.users.${cfg.user} = {
+      systemd.user.services = {
+        remote-hyprland = {
           Unit = {
             Description = "Headless Hyprland session for remote VNC access";
             After = [ "default.target" ];
           };
           Service = {
-        ExecStart = "${hyprlandPackage}/bin/start-hyprland --path ${hyprlandPackage}/bin/Hyprland -- --socket ${cfg.socket} --config ${remoteHyprlandConfig}";
+            ExecStart = "${hyprlandPackage}/bin/start-hyprland --path ${hyprlandPackage}/bin/Hyprland -- --config ${remoteHyprlandConfig}";
             Restart = "on-failure";
             RestartSec = 5;
             Environment = [
               "XDG_CURRENT_DESKTOP=Hyprland"
               "XDG_SESSION_DESKTOP=Hyprland"
               "XDG_SESSION_TYPE=wayland"
-          "WAYLAND_DISPLAY=${cfg.socket}"
+              "LIBSEAT_BACKEND=seatd"
+              "PATH=${servicePath}"
             ];
           };
-      Install = {
+        } // autostartInstall;
-        WantedBy = [ "default.target" ];
+
+        remote-hyprland-wayvnc = {
+          Unit = {
+            Description = "VNC server for the headless Hyprland session";
+            After = [ "remote-hyprland.service" ];
+            Requires = [ "remote-hyprland.service" ];
+            PartOf = [ "remote-hyprland.service" ];
+          };
+          Service = {
+            ExecStart = "${remoteHyprlandStartVnc}";
+            Restart = "on-failure";
+            RestartSec = 5;
+            Environment = [
+              "XDG_CURRENT_DESKTOP=Hyprland"
+              "XDG_SESSION_DESKTOP=Hyprland"
+              "XDG_SESSION_TYPE=wayland"
+              "LIBSEAT_BACKEND=seatd"
+              "PATH=${servicePath}"
+            ];
+          };
+        } // autostartInstall;
       };
     };
   };
@@ -154,12 +226,6 @@ enabledModule // {
         description = "TCP port for wayvnc.";
       };
 
-      socket = lib.mkOption {
-        type = lib.types.str;
-        default = "wayland-remote-hyprland";
-        description = "Wayland socket name used by the remote Hyprland instance.";
-      };
-
       output = lib.mkOption {
         type = lib.types.str;
         default = "remote";
@@ -195,6 +261,16 @@ enabledModule // {
         default = "${pkgs.ghostty}/bin/ghostty --gtk-single-instance=false";
         description = "Command launched for the default terminal binding and initial window.";
       };
+
+      autoStart = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = ''
+          Whether to start the remote Hyprland session automatically with the
+          user's systemd manager. Keep this disabled on single-GPU hosts with
+          an active display manager, because Hyprland needs DRM master.
+        '';
+      };
     };
   };
 }