nixos/xfce: option to disable xfce4-screensaver

Signed-off-by: lucasew <lucas59356@gmail.com>

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -1880,7 +1880,10 @@
         <para>
           <literal>services.xserver.desktopManager.xfce</literal> now
           includes Xfce’s screen locker,
-          <literal>xfce4-screensaver</literal>.
+          <literal>xfce4-screensaver</literal> that is enabled by
+          default. You can disable it by setting
+          <literal>false</literal> to
+          <link linkend="opt-services.xserver.desktopManager.xfce.enableScreensaver">services.xserver.desktopManager.xfce.enableScreensaver</link>.
         </para>
       </listitem>
       <listitem>

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -642,7 +642,7 @@ In addition to numerous new and upgraded packages, this release has the followin
 - xfsprogs was update to version 5.15, which enables inobtcount and bigtime by default on filesystem creation. Support for these features was added in kernel 5.10 and deemed stable in kernel 5.15.
   If you want to be able to mount XFS filesystems created with this release of xfsprogs on kernel releases older than 5.10, you need to format them with `mkfs.xfs -m bigtime=0 -m inobtcount=0`.
 
-- `services.xserver.desktopManager.xfce` now includes Xfce's screen locker, `xfce4-screensaver`.
+- `services.xserver.desktopManager.xfce` now includes Xfce's screen locker, `xfce4-screensaver` that is enabled by default. You can disable it by setting `false` to [services.xserver.desktopManager.xfce.enableScreensaver](#opt-services.xserver.desktopManager.xfce.enableScreensaver).
 
 - The `hadoop` package has added support for `aarch64-linux` and `aarch64-darwin` as of 3.3.1 ([#158613](https://github.com/NixOS/nixpkgs/pull/158613)).
 

nixos/modules/services/x11/desktop-managers/xfce.nix

@@ -66,6 +66,12 @@ in
         default = true;
         description = "Enable the XFWM (default) window manager.";
       };
+
+      enableScreensaver = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable the XFCE screensaver.";
+      };
     };
   };
 
@@ -99,7 +105,6 @@ in
       ristretto
       xfce4-appfinder
       xfce4-notifyd
-      xfce4-screensaver
       xfce4-screenshooter
       xfce4-session
       xfce4-settings
@@ -123,7 +128,7 @@ in
       ] ++ optionals (!cfg.noDesktop) [
         xfce4-panel
         xfdesktop
-      ];
+      ] ++ optional cfg.enableScreensaver xfce4-screensaver;
 
     environment.pathsToLink = [
       "/share/xfce4"
@@ -169,6 +174,6 @@ in
       xfce4-notifyd
     ];
 
-    security.pam.services.xfce4-screensaver.unixAuth = true;
+    security.pam.services.xfce4-screensaver.unixAuth = cfg.enableScreensaver;
   };
 }