modules/ly: Make the river desktop target available to ly

As `ly` runs under `root`, it obviously cannot access `soispha`'s
desktop target files.

1 files changed, 29 insertions, 0 deletions

diff --git a/modules/by-name/ly/ly/module.nix b/modules/by-name/ly/ly/module.nix
index 809eb256..0c8f5f85 100644
--- a/modules/by-name/ly/ly/module.nix
+++ b/modules/by-name/ly/ly/module.nix
@@ -14,6 +14,23 @@
   ...
 }: let
   cfg = config.soispha.programs.ly;
+
+  # HACK: We search for the generate river desktop file, which should exist <2026-03-13>
+  riverDesktop =
+    lib.lists.findFirst
+    (x: lib.strings.hasSuffix "river.desktop" x)
+    null
+    config.home-manager.users.soispha.home.packages;
+
+  customSessionsDir =
+    pkgs.runCommand "custom-sessions" {}
+    /*
+    bash
+    */
+    ''
+      mkdir "$out";
+      cp "${riverDesktop}/share/applications/river.desktop" "$out"
+    '';
 in {
   options.soispha.programs.ly = {
     enable = lib.mkEnableOption "ly";
@@ -27,6 +44,16 @@ in {
   };
 
   config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = riverDesktop != null;
+        message = ''
+          There seems to be no `river.desktop` file generated. You will not be able to
+          log-into river without it.
+        '';
+      }
+    ];
+
     services.displayManager.ly = {
       enable = true;
       x11Support = false;
@@ -39,6 +66,8 @@ in {
 
         animation = "matrix";
 
+        custom_sesions = "${customSessionsDir}";
+
         # Clear the password on failure.
         clear_password = true;