oslo-config: fix argparse dependencies

pkgs/development/python-modules/oslo-config/default.nix

@@ -0,0 +1,22 @@
+{ buildPythonPackage, fetchPypi, pbr, six, netaddr, stevedore, mock }:
+
+buildPythonPackage rec {
+  pname = "oslo.config";
+  version = "2.5.0";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "043mavrzj7vjn7kh1dddci4sf67qwqnnn6cm0k1d19alks9hismz";
+  };
+
+  propagatedBuildInputs = [ pbr six netaddr stevedore ];
+  buildInputs = [ mock ];
+
+  # TODO: circular import on oslo-i18n
+  doCheck = false;
+
+  postPatch = ''
+    substituteInPlace requirements.txt --replace "argparse"
+  '';
+}

pkgs/top-level/python-packages.nix

@@ -17006,21 +17006,7 @@ in {
     '';
   };
 
-  oslo-config = buildPythonPackage rec {
+  oslo-config = callPackage ../development/python-modules/oslo-config { };
-    name = "oslo.config-${version}";
-    version = "2.5.0";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/o/oslo.config/${name}.tar.gz";
-      sha256 = "043mavrzj7vjn7kh1dddci4sf67qwqnnn6cm0k1d19alks9hismz";
-    };
-
-    propagatedBuildInputs = with self; [ argparse pbr six netaddr stevedore ];
-    buildInputs = [ self.mock ];
-
-    # TODO: circular import on oslo-i18n
-    doCheck = false;
-  };
 
   oslotest = buildPythonPackage rec {
     name = "oslotest-${version}";