testing: some usability improvements

testing.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ pkgs, lib, ... }:
 
 let
   secrets = toString ./secrets;
@@ -11,24 +11,23 @@ in
   ];
 
   virtualisation.memorySize = "4000"; # MB
+  virtualisation.graphics = false;
 
-  virtualisation.qemu.options = [
-    # Use serial console to access the VM
-    "-display none"
-    "-serial mon:stdio"
+  virtualisation.qemu.options =
+    [ # Ensure secrets are accessible by the
+      # activation scripts at runtime.
+      "-virtfs local,path=${secrets},security_model=none,mount_tag=secrets"
+    ];
 
-    # Ensure secrets are accessible by the
-    # activation scripts at runtime.
-    "-virtfs local,path=${secrets},security_model=none,mount_tag=secrets"
-  ];
+  virtualisation.fileSystems."${secrets}" =
+    { device = "secrets";
+      fsType = "9p";
+      options = [ "trans=virtio" "version=9p2000.L" ];
+      neededForBoot = true;
+    };
 
-  fileSystems = lib.mkVMOverride {
-   "${secrets}" =
-      { device = "secrets";
-        fsType = "9p";
-        options = [ "trans=virtio" "version=9p2000.L" ];
-        neededForBoot = true;
-      };
-  };
+  # Automatically resize the console
+  environment.systemPackages = [ pkgs.xterm ];
+  environment.shellInit = "resize > /dev/null";
 
 }