nixos/extra-container: init

nixos/modules/module-list.nix

@@ -135,6 +135,7 @@
   ./programs/droidcam.nix
   ./programs/environment.nix
   ./programs/evince.nix
+  ./programs/extra-container.nix
   ./programs/feedbackd.nix
   ./programs/file-roller.nix
   ./programs/firejail.nix

nixos/modules/programs/extra-container.nix

@@ -0,0 +1,17 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.programs.extra-container;
+in {
+  options = {
+    programs.extra-container.enable = mkEnableOption ''
+      extra-container, a tool for running declarative NixOS containers
+      without host system rebuilds
+    '';
+  };
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.extra-container ];
+    boot.extraSystemdUnitPaths = [ "/etc/systemd-mutable/system" ];
+  };
+}