nixos/sx: init

nixos/doc/manual/from_md/release-notes/rl-2111.section.xml

@@ -182,7 +182,7 @@
         </para>
       </listitem>
     </itemizedlist>
-    <itemizedlist spacing="compact">
+    <itemizedlist>
       <listitem>
         <para>
           <link xlink:href="https://docs.fluidd.xyz/">fluidd</link>, a
@@ -191,6 +191,14 @@
           <link linkend="opt-services.fluidd.enable">fluidd</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://github.com/earnestly/sx">sx</link>,
+          a simple alternative to both xinit and startx for starting a
+          Xorg server. Available as
+          <link linkend="opt-services.xserver.displayManager.sx.enable">services.xserver.displayManager.sx</link>
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-21.11-incompatibilities">

nixos/doc/manual/release-notes/rl-2111.section.md

@@ -58,6 +58,8 @@ subsonic-compatible api. Available as [navidrome](#opt-services.navidrome.enable
 
 - [fluidd](https://docs.fluidd.xyz/), a Klipper web interface for managing 3d printers using moonraker. Available as [fluidd](#opt-services.fluidd.enable).
 
+- [sx](https://github.com/earnestly/sx), a simple alternative to both xinit and startx for starting a Xorg server. Available as [services.xserver.displayManager.sx](#opt-services.xserver.displayManager.sx.enable)
+
 ## Backward Incompatibilities {#sec-release-21.11-incompatibilities}
 
 - The `paperless` module and package have been removed. All users should migrate to the

nixos/modules/module-list.nix

@@ -1036,6 +1036,7 @@
   ./services/x11/display-managers/sddm.nix
   ./services/x11/display-managers/slim.nix
   ./services/x11/display-managers/startx.nix
+  ./services/x11/display-managers/sx.nix
   ./services/x11/display-managers/xpra.nix
   ./services/x11/fractalart.nix
   ./services/x11/hardware/libinput.nix

nixos/modules/services/x11/display-managers/sx.nix

@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.xserver.displayManager.sx;
+
+in {
+  options = {
+    services.xserver.displayManager.sx = {
+      enable = mkEnableOption "sx pseudo-display manager" // {
+        description = ''
+          Whether to enable the "sx" pseudo-display manager, which allows users
+          to start manually via the "sx" command from a vt shell. The X server
+          runs under the user's id, not as root. The user must provide a
+          ~/.config/sx/sxrc file containing session startup commands, see
+          sx(1). This is not automatically generated from the desktopManager
+          and windowManager settings. sx doesn't have a way to directly set
+          X server flags, but it can be done by overriding its xorgserver
+          dependency.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.sx ];
+    services.xserver = {
+      exportConfiguration = true;
+      displayManager = {
+        job.execCmd = "";
+        lightdm.enable = mkForce false;
+      };
+      logFile = mkDefault null;
+    };
+    systemd.services.display-manager.enable = false;
+  };
+}