Merge #155: nixops: build with pinned nixpkgs

041ec55 nixops: build with pinned nixpkgs (Erik Arvstedt)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 041ec55

Tree-SHA512: dfe01993b2f8d6f135069dc59dc03e5902f5a36a7f9f63f3299453314cb2cec5da3be9ef66f0186f03c132d0828d30b53d2760aaf91b77f3e2b95555304c4269

pkgs/nixops/default.nix

@@ -2,7 +2,7 @@
 # 19.09 demands a suitable base image (defined in nixops-vbox/nix/virtualbox.nix) to
 # start the virtualbox guest service during system activation.
 
-{ stdenv, nixops, runCommand, fetchFromGitHub }:
+{ pkgs, stdenv, runCommand, fetchFromGitHub }:
 
 let
   pluginData = {
@@ -46,6 +46,7 @@ let
   '';
 
   nixopsRelease = import "${src}/release.nix" {
+    nixpkgs = pkgs.path;
     inherit pluginData;
     p = (p: with p; [ aws hetzner vbox libvirtd ]);
   };