Fix journal log flood in headless mode

Signed-off-by: Kajus Naujokaitis <kajus.naujokaitis@unikie.com>

Author: kajusnau

modules/desktop/graphics/ewwbar.nix

@@ -115,9 +115,33 @@ in
         description = "ewwbar";
         serviceConfig = {
           Type = "forking";
-          ExecCondition = ''
-            ${pkgs.bash}/bin/bash -c "${pkgs.wlr-randr}/bin/wlr-randr > /dev/null 2>&1"
-          '';
+          ExecCondition =
+            let
+              display-connected = pkgs.writeShellApplication {
+                name = "display-connected";
+                runtimeInputs = [
+                  pkgs.jq
+                  pkgs.wlr-randr
+                ];
+                bashOptions = [ ];
+                text = ''
+                  # Exits with error if no display is detected
+
+                  # Retrieve display information
+                  if ! wlr_output_json=$(wlr-randr --json); then
+                    echo "Error: Failed to get display info from wlr-randr"
+                    exit 1
+                  fi
+
+                  # Check if any displays are connected
+                  if ! echo "$wlr_output_json" | jq -e 'length > 0' > /dev/null; then
+                    echo "Error: No connected displays found."
+                    exit 1
+                  fi
+                '';
+              };
+            in
+            "${display-connected}/bin/display-connected";
           ExecStart = "${ewwScripts.ewwbar-ctrl}/bin/ewwbar-ctrl start";
           ExecReload = "${ewwScripts.ewwbar-ctrl}/bin/ewwbar-ctrl reload";
           ExecStopPost = ''

modules/desktop/graphics/labwc.config.nix

@@ -426,21 +426,56 @@ let
       auto-display-scale
       pkgs.mako
       pkgs.wlr-randr
+      pkgs.jq
     ];
     bashOptions = [ ];
     text = ''
-      # Run the following commands in order every time a display change event is detected
+      stop_services() {
+        echo "No displays connected. Stopping ghaf-launcher and ewwbar services."
+        systemctl --user stop ewwbar ghaf-launcher
+      }
+
       auto-display-scale        # Auto scaling
       makoctl set-mode default  # Reset mako mode so notifications don't break
 
-      if wlr-randr > /dev/null 2>&1; then
-          # If displays are connected (not headless mode), ensure ewwbar and ghaf-launcher are running
-          systemctl --user is-active --quiet ewwbar || systemctl --user reload-or-restart ewwbar
-          systemctl --user is-active --quiet ghaf-launcher || systemctl --user reload-or-restart ghaf-launcher
-      else
-          # If all displays were disconnected, we can stop ghaf-launcher and ewwbar services
-          echo "No displays connected. Stopping ghaf-launcher and ewwbar services"
-          systemctl --user stop ewwbar ghaf-launcher
+      # Retrieve display information
+      if ! wlr_output_json=$(wlr-randr --json); then
+        echo "Error: Failed to get display info from wlr-randr"
+        stop_services
+      fi
+
+      # Check if any displays are connected
+      if ! echo "$wlr_output_json" | jq -e 'length > 0' > /dev/null; then
+        echo "Error: No connected displays found."
+        stop_services
+      fi
+
+      # If displays are connected (not headless mode), ensure ewwbar and ghaf-launcher are running
+      systemctl --user is-active --quiet ewwbar || systemctl --user reload-or-restart ewwbar
+      systemctl --user is-active --quiet ghaf-launcher || systemctl --user reload-or-restart ghaf-launcher
+    '';
+  };
+
+  display-connected = pkgs.writeShellApplication {
+    name = "display-connected";
+    runtimeInputs = [
+      pkgs.jq
+      pkgs.wlr-randr
+    ];
+    bashOptions = [ ];
+    text = ''
+      # Exits with error if no display is detected
+
+      # Retrieve display information
+      if ! wlr_output_json=$(wlr-randr --json); then
+        echo "Error: Failed to get display info from wlr-randr"
+        exit 1
+      fi
+
+      # Check if any displays are connected
+      if ! echo "$wlr_output_json" | jq -e 'length > 0' > /dev/null; then
+        echo "Error: No connected displays found."
+        exit 1
       fi
     '';
   };
@@ -501,9 +536,7 @@ in
         serviceConfig = {
           Type = "simple";
           EnvironmentFile = "-/etc/locale.conf";
-          ExecCondition = ''
-            ${pkgs.bash}/bin/bash -c "${pkgs.wlr-randr}/bin/wlr-randr > /dev/null 2>&1"
-          '';
+          ExecCondition = "${display-connected}/bin/display-connected";
           ExecStart = "${pkgs.nwg-drawer}/bin/nwg-drawer -r -nofs -nocats -s ${drawerStyle}";
           Restart = "always";
           RestartSec = "1";
@@ -569,6 +602,7 @@ in
           Type = "simple";
           Restart = "always";
           RestartSec = "5";
+          ExecCondition = "${display-connected}/bin/display-connected";
           ExecStart = "${pkgs.ghaf-audio-control}/bin/GhafAudioControlStandalone --pulseaudio_server=audio-vm:${toString config.ghaf.services.audio.pulseaudioTcpControlPort} --deamon_mode=true --indicator_icon_name=audio-subwoofer";
         };