sway: Simplify screen sharing

This should make it easier to get started.
The xdg-desktop-portal backend for wlroots is required and one needs to
"make sure WAYLAND_DISPLAY and XDG_CURRENT_DESKTOP are imported into
D-Bus." [0]

[0]: https://github.com/emersion/xdg-desktop-portal-wlr/blob/efcbcb60aa3bc46b0e290d5f6627783fbb534dcd/README.md#running

1 files changed, 3 insertions, 1 deletions

diff --git a/nixos/modules/programs/sway.nix b/nixos/modules/programs/sway.nix
index 2b69851b340..ca79177f827 100644
--- a/nixos/modules/programs/sway.nix
+++ b/nixos/modules/programs/sway.nix
@@ -124,7 +124,7 @@ in {
         "sway/config.d/nixos.conf".source = pkgs.writeText "nixos.conf" ''
           # Import the most important environment variables into the D-Bus and systemd
           # user environments (e.g. required for screen sharing and Pinentry prompts):
-          exec dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK
+          exec dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP
         '';
       };
     };
@@ -135,6 +135,8 @@ in {
     # To make a Sway session available if a display manager like SDDM is enabled:
     services.xserver.displayManager.sessionPackages = [ swayPackage ];
     programs.xwayland.enable = mkDefault true;
+    # For screen sharing (this option only has an effect with xdg.portal.enable):
+    xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-wlr ];
   };
 
   meta.maintainers = with lib.maintainers; [ gnidorah primeos colemickens ];