compat nixpkgs and change to testing-python.nix

lib/compat.nix

@@ -0,0 +1,17 @@
+let
+  inherit (builtins)
+    fetchTarball
+    fromJSON
+    readFile
+    ;
+  lockfile = fromJSON (readFile ../flake.lock);
+in
+input:
+let
+  locked = lockfile.nodes."${input}".locked;
+  inherit (locked) rev narHash owner repo;
+in
+fetchTarball {
+  url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
+  sha256 = narHash;
+}

modules/testing.nix

@@ -7,7 +7,7 @@ let
 
   toJSONFile = content: builtins.toFile "json" (builtins.toJSON content);
 
-  nixosTesting = import "${nixosPath}/lib/testing.nix" {
+  nixosTesting = import "${nixosPath}/lib/testing-python.nix" {
     inherit pkgs;
     system = "x86_64-linux";
   };

release.nix

@@ -1,5 +1,12 @@
-{ pkgs ? import <nixpkgs> {}, nixosPath ? toString <nixpkgs/nixos>, lib ? pkgs.lib
-, e2e ? true, throwError ? true }:
+let
+  fetch = import ./lib/compat.nix;
+in
+{ pkgs ? import (fetch "nixpkgs") { }
+, nixosPath ? toString (fetch "nixpkgs") + "/nixos"
+, lib ? pkgs.lib
+, e2e ? true
+, throwError ? true
+}:
 
 with lib;
 
@@ -23,7 +30,8 @@ let
   runK8STests = k8sVersion: import ./tests {
     inherit pkgs lib kubenix k8sVersion e2e throwError nixosPath;
   };
-in rec {
+in
+rec {
   generate.k8s = pkgs.linkFarm "k8s-generated.nix" [
     {
       name = "v1.8.nix";
@@ -130,15 +138,17 @@ in rec {
     k8s-1_18 = runK8STests "1.18";
   };
 
-  test-results = pkgs.recurseIntoAttrs (mapAttrs (_: t: pkgs.recurseIntoAttrs {
+  test-results = pkgs.recurseIntoAttrs (mapAttrs
+    (_: t: pkgs.recurseIntoAttrs {
       results = pkgs.recurseIntoAttrs t.results;
       result = t.result;
-  }) tests);
+    })
+    tests);
 
   test-check =
     if !(all (test: test.success) (attrValues tests))
     then throw "tests failed"
     else true;
 
-  examples = import ./examples {};
+  examples = import ./examples { };
 }