{ lib, config, nixpkgs, ... }:

let
  pkgs = config.nodes.machine.nixpkgs.pkgs;
  pkgA = pkgs.hello;
  pkgB = pkgs.cowsay;
in {
  name = "chroot-store";

  nodes =
    { machine =
        { config, lib, pkgs, ... }:
        { virtualisation.writableStore = true;
          virtualisation.additionalPaths = [ pkgA ];
          environment.systemPackages = [ pkgB ];
          nix.extraOptions = "experimental-features = nix-command";
        };
    };

  testScript = { nodes }: ''
    # fmt: off
    start_all()

    machine.succeed("nix copy --no-check-sigs --to /tmp/nix ${pkgA}")

    machine.succeed("nix shell --store /tmp/nix ${pkgA} --command hello >&2")

    # Test that /nix/store is available via an overlayfs mount.
    machine.succeed("nix shell --store /tmp/nix ${pkgA} --command cowsay foo >&2")
  '';
}