3 files changed, 11 insertions, 5 deletions
diff --git a/nixos/lib/build-vms.nix b/nixos/lib/build-vms.nix
index 48288cf5962c..4f65501f89c6 100644
--- a/nixos/lib/build-vms.nix
+++ b/nixos/lib/build-vms.nix
@@ -28,7 +28,7 @@ rec {
       modules = configurations ++
         [ ../modules/virtualisation/qemu-vm.nix
           ../modules/testing/test-instrumentation.nix # !!! should only get added for automated test runs
-          { key = "no-manual"; services.nixosManual.enable = false; }
+          { key = "no-manual"; documentation.nixos.enable = false; }
           { key = "qemu"; system.build.qemu = qemu; }
         ] ++ optional minimal ../modules/testing/minimal-kernel.nix;
       extraArgs = { inherit nodes; };
diff --git a/nixos/lib/eval-config.nix b/nixos/lib/eval-config.nix
index 97c79487df4c..f71e264c3478 100644
--- a/nixos/lib/eval-config.nix
+++ b/nixos/lib/eval-config.nix
@@ -28,7 +28,7 @@
 
 let extraArgs_ = extraArgs; pkgs_ = pkgs;
     extraModules = let e = builtins.getEnv "NIXOS_EXTRA_MODULE_PATH";
-                   in if e == "" then [] else [(import (builtins.toPath e))];
+                   in if e == "" then [] else [(import e)];
 in
 
 let
@@ -36,7 +36,11 @@ let
     _file = ./eval-config.nix;
     key = _file;
     config = {
-      nixpkgs.localSystem = lib.mkDefault { inherit system; };
+      # Explicit `nixpkgs.system` or `nixpkgs.localSystem` should override
+      # this.  Since the latter defaults to the former, the former should
+      # default to the argument. That way this new default could propagate all
+      # they way through, but has the last priority behind everything else.
+      nixpkgs.system = lib.mkDefault system;
       _module.args.pkgs = lib.mkIf (pkgs_ != null) (lib.mkForce pkgs_);
     };
   };
diff --git a/nixos/lib/test-driver/Machine.pm b/nixos/lib/test-driver/Machine.pm
index b18f48464cee..a00fe25c2b8e 100644
--- a/nixos/lib/test-driver/Machine.pm
+++ b/nixos/lib/test-driver/Machine.pm
@@ -155,8 +155,10 @@ sub start {
         $ENV{USE_TMPDIR} = 1;
         $ENV{QEMU_OPTS} =
             ($self->{allowReboot} ? "" : "-no-reboot ") .
-            "-monitor unix:./monitor -chardev socket,id=shell,path=./shell " .
-            "-device virtio-serial -device virtconsole,chardev=shell " .
+            "-monitor unix:./monitor " .
+            "-chardev socket,id=shell,path=./shell -device virtio-serial -device virtconsole,chardev=shell " .
+            # socket backdoor, see "Debugging NixOS tests" section in NixOS manual
+            "-chardev socket,id=backdoor,path=./backdoor,server,nowait -device virtio-serial -device virtconsole,chardev=backdoor " .
             "-device virtio-rng-pci " .
             ($showGraphics ? "-serial stdio" : "-nographic") . " " . ($ENV{QEMU_OPTS} || "");
         chdir $self->{stateDir} or die;