ly: add option to build without x11 support

nixos/modules/services/display-managers/ly.nix

@@ -12,7 +12,7 @@ let
   cfg = config.services.displayManager.ly;
   xEnv = config.systemd.services.display-manager.environment;
 
-  ly = cfg.package;
+  ly = cfg.package.override { x11Support = cfg.x11Support; };
 
   iniFmt = pkgs.formats.iniWithGlobalSection { };
 
@@ -57,6 +57,11 @@ in
   options = {
     services.displayManager.ly = {
       enable = mkEnableOption "ly as the display manager";
+      x11Support = mkOption {
+        description = "Whether to enable support for X11";
+        type = lib.types.bool;
+        default = true;
+      };
 
       package = mkPackageOption pkgs [ "ly" ] { };
 

nixos/tests/ly.nix

@@ -1,23 +1,35 @@
-{ ... }:
+{ lib, ... }:
 
+let
+  machineBase = {
+    imports = [ ./common/user-account.nix ];
+    services.displayManager.ly = {
+      enable = true;
+      settings = {
+        load = false;
+        save = false;
+      };
+    };
+  };
+in
 {
   name = "ly";
 
   nodes.machine =
     { ... }:
-    {
-      imports = [ ./common/user-account.nix ];
-      services.displayManager.ly = {
-        enable = true;
-        settings = {
-          load = false;
-          save = false;
-        };
-      };
+    lib.attrsets.recursiveUpdate machineBase {
+      services.displayManager.ly.x11Support = true;
       services.xserver.enable = true;
       services.displayManager.defaultSession = "none+icewm";
       services.xserver.windowManager.icewm.enable = true;
     };
+  nodes.machineNoX11 =
+    { ... }:
+    lib.attrsets.recursiveUpdate machineBase {
+      services.displayManager.ly.x11Support = false;
+      services.displayManager.defaultSession = "sway";
+      programs.sway.enable = true;
+    };
 
   testScript =
     { nodes, ... }:
@@ -26,6 +38,7 @@
     in
     ''
       start_all()
+
       machine.wait_until_tty_matches("2", "password:")
       machine.send_key("ctrl-alt-f2")
       machine.sleep(1)
@@ -38,5 +51,18 @@
       machine.succeed("xauth merge /run/user/${toString user.uid}/lyxauth")
       machine.wait_for_window("^IceWM ")
       machine.screenshot("icewm")
+
+      machineNoX11.wait_until_tty_matches("2", "password:")
+      machineNoX11.send_key("ctrl-alt-f2")
+      machineNoX11.sleep(1)
+      machineNoX11.screenshot("ly-no-x11")
+      machineNoX11.send_chars("alice")
+      machineNoX11.send_key("tab")
+      machineNoX11.send_chars("${user.password}")
+      machineNoX11.send_key("ret")
+      machineNoX11.wait_for_file("/run/user/${toString user.uid}/wayland-1")
+      machineNoX11.wait_for_file("/run/user/${toString user.uid}/sway-ipc.*.sock")
+      machineNoX11.sleep(5)
+      machineNoX11.screenshot("sway")
     '';
 }

pkgs/by-name/ly/ly/package.nix

@@ -8,6 +8,7 @@
   zig_0_14,
   callPackage,
   nixosTests,
+  x11Support ? true,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -27,9 +28,8 @@ stdenv.mkDerivation (finalAttrs: {
     zig_0_14.hook
   ];
   buildInputs = [
-    libxcb
     linux-pam
-  ];
+  ] ++ (lib.optionals x11Support [ libxcb ]);
 
   postPatch = ''
     ln -s ${
@@ -38,6 +38,9 @@ stdenv.mkDerivation (finalAttrs: {
       }
     } $ZIG_GLOBAL_CACHE_DIR/p
   '';
+  zigBuildFlags = [
+    "-Denable_x11_support=${lib.boolToString x11Support}"
+  ];
 
   passthru.tests = { inherit (nixosTests) ly; };