nixos/flatpak: init

nixos/modules/module-list.nix

@@ -214,6 +214,7 @@
   ./services/desktops/accountsservice.nix
   ./services/desktops/dleyna-renderer.nix
   ./services/desktops/dleyna-server.nix
+  ./services/desktops/flatpak.nix
   ./services/desktops/geoclue2.nix
   ./services/desktops/pipewire.nix
   ./services/desktops/gnome3/at-spi2-core.nix

nixos/modules/services/desktops/flatpak.nix

@@ -0,0 +1,28 @@
+# flatpak service.
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  ###### interface
+  options = {
+    services.flatpak = {
+      enable = mkEnableOption "flatpak";
+    };
+  };
+
+
+  ###### implementation
+  config = mkIf config.services.flatpak.enable {
+    environment.systemPackages = [ pkgs.flatpak ];
+
+    services.dbus.packages = [ pkgs.flatpak ];
+
+    systemd.packages = [ pkgs.flatpak ];
+
+    environment.variables.PATH = [
+      "$HOME/.local/share/flatpak/exports/bin"
+      "/var/lib/flatpak/exports/bin"
+    ];
+  };
+}