legosi: Use modulesPath instead of <nixpkgs/nixos>

While it's fine to use <nixpkgs> on most systems, we deliberately want
to avoid the use of <nixpkgs> to make sure that whenever we for example
run <nixpkgs/nixos/lib/eval-config.nix> with a custom "pkgs" argument we
are guaranteed that we get the version we specify.

So this is one of the reason I used <nixpkgsSrc> on Hydra instead of
<nixpkgs>, so that whenever we have such occasions where we can't
guarantee such things, the evaluation will fail.

And right now, it does:

  in job 'machines.profpatsch.legosi':

  file 'nixpkgs/nixos/modules/profiles/qemu-guest.nix' was not found in
  the Nix search path (add it using $NIX_PATH or -I), at
  .../machines/profpatsch/legosi.nix:12:5

Fortunately, there is modulesPath, which refers to
<nixpkgs/nixos/modules> of the nixpkgs version passed via "pkgs".

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @Profpatsch

1 files changed, 2 insertions, 2 deletions

diff --git a/machines/profpatsch/legosi.nix b/machines/profpatsch/legosi.nix
index 9508cbde..fc3da387 100644
--- a/machines/profpatsch/legosi.nix
+++ b/machines/profpatsch/legosi.nix
@@ -1,4 +1,4 @@
-{ config, pkgs, lib, ... }:
+{ modulesPath, config, pkgs, lib, ... }:
 
 let
   myLib  = import ./lib.nix  { inherit pkgs lib; };
@@ -9,7 +9,7 @@ let
 in {
   imports = [
     ./base-server.nix
-    <nixpkgs/nixos/modules/profiles/qemu-guest.nix>
+    "${modulesPath}/profiles/qemu-guest.nix"
   ];
 
   config = {