test: verify independent guests and recovery on private displays

dev/tools.nix

@@ -8,7 +8,7 @@ let
     url = "https://github.com/NixOS/nixpkgs/archive/7fd4004d0511991fff3a0524856a9be09e28c5f0.tar.gz";
     sha256 = "sha256-i5qk1kLiit98rRbh1AXmWBNT9QXC/y4l5Wk/u5EdpDQ=";
   }) {};
-  qemu = pkgs.qemu.overrideAttrs (old: {
+  qemu = (pkgs.qemu.override { hostCpuOnly = true; }).overrideAttrs (old: {
     patches = (old.patches or []) ++ [ ../patches/qemu-virtio-refresh-rate.patch ];
   });
   viewer = pkgs.virt-viewer.overrideAttrs (old: {
@@ -20,6 +20,8 @@ let
     doCheck = true;
   });
 in pkgs.mkShell {
+  nativeBuildInputs = [ pkgs.stdenv.cc pkgs.pkg-config pkgs.wayland-scanner ];
+  buildInputs = [ pkgs.wayland.dev pkgs.libxkbcommon.dev ];
   packages = [ pkgs.python3 qemu viewer graphics.labwc pkgs.foot
                pkgs.brightnessctl pkgs.wayland-utils pkgs.wlr-randr ];
   passthru = { inherit viewer qemu; labwc = graphics.labwc; };