fix blackduck (#15728)

nix/default.nix

@@ -112,17 +112,15 @@ in rec {
     chromedriver = pkgs.chromedriver;
 
     # Python development
-    pip3        = pkgs.python38Packages.pip;
+    pip3        = pkgs.python37Packages.pip;
-    python      = pkgs.python38Packages.python;
+    python      = pkgs.python37Packages.python;
     python3     = python;
+    python37 = python;
 
     yapf = pkgs.python38Packages.yapf;
 
     pex = pkgs.python38Packages.pex;
-    pipenv = import ./tools/pipenv {
+    pipenv = pkgs.pipenv;
-      lib = pkgs.lib;
-      python = python;
-    };
 
     sphinx-build      = sphinx;
     sphinx-quickstart = sphinx;

nix/tools/pipenv/default.nix

@@ -1,59 +0,0 @@
-# copied from
-# https://raw.githubusercontent.com/NixOS/nixpkgs/1c406512eb6331ca4d75e0d63298c5e0e7009fdd/pkgs/development/tools/pipenv/default.nix
-# then modified to disable check phase (line 46)
-
-{ lib
-, python
-}:
-
-with python.pkgs;
-
-let
-
-  runtimeDeps = [
-    certifi
-    setuptools
-    pip
-    virtualenv
-    virtualenv-clone
-  ];
-
-  pythonEnv = python.withPackages(ps: with ps; [ virtualenv ]);
-
-in buildPythonApplication rec {
-  pname = "pipenv";
-  version = "2018.11.26";
-
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "0ip8zsrwmhrankrix0shig9g8q2knmr7b63sh7lqa8a5x03fcwx6";
-  };
-
-  LC_ALL = "en_US.UTF-8";
-
-  postPatch = ''
-    # pipenv invokes python in a subprocess to create a virtualenv
-    # it uses sys.executable which will point in our case to a python that
-    # does not have virtualenv.
-    substituteInPlace pipenv/core.py \
-      --replace "vistir.compat.Path(sys.executable).absolute().as_posix()" "vistir.compat.Path('${pythonEnv.interpreter}').absolute().as_posix()"
-  '';
-
-  nativeBuildInputs = [ invoke parver ];
-
-  propagatedBuildInputs = runtimeDeps;
-
-  doCheck = false;
-  checkPhase = ''
-    export HOME=$(mktemp -d)
-    cp -r --no-preserve=mode ${wheel.src} $HOME/wheel-src
-    $out/bin/pipenv install $HOME/wheel-src
-  '';
-
-  meta = with lib; {
-    description = "Python Development Workflow for Humans";
-    license = licenses.mit;
-    platforms = platforms.all;
-    maintainers = with maintainers; [ berdario ];
-  };
-}