koji: factor python module into an standalone app

pkgs/tools/package-management/koji/default.nix

···
+{ stdenv, fetchurl, pythonPackages, python }:
+
+stdenv.mkDerivation rec {
+  name = "koji-1.8";
+
+  src = fetchurl {
+    url = "https://fedorahosted.org/released/koji/koji-1.8.0.tar.bz2";
+    sha256 = "10dph209h4jgajb5jmbjhqy4z4hd22i7s2d93vm3ikdf01i8iwf1";
+  };
+
+  propagatedBuildInputs = [ pythonPackages.pycurl python ];
+
+  makeFlags = "DESTDIR=$(out)";
+
+  postInstall = ''
+    cp -R $out/nix/store/*/* $out/
+    rm -rf $out/nix
+  '';
+
+  meta.maintainers = [ stdenv.lib.maintainers.mornfall ];
+}

pkgs/top-level/all-packages.nix

···
     inherit (gnome) libglade;
   };
 
+  koji = callPackage ../tools/package-management/koji { };
+
   lame = callPackage ../applications/audio/lame { };
 
   larswm = callPackage ../applications/window-managers/larswm { };

pkgs/top-level/python-packages.nix

···
     };
   };
 
-  # TODO: this shouldn't use a buildPythonPackage
-  koji = buildPythonPackage (rec {
-    name = "koji-1.8";
-    meta.maintainers = [ stdenv.lib.maintainers.mornfall ];
-    disabled = isPy3k;
-
-    src = fetchurl {
-      url = "https://fedorahosted.org/released/koji/koji-1.8.0.tar.bz2";
-      sha256 = "10dph209h4jgajb5jmbjhqy4z4hd22i7s2d93vm3ikdf01i8iwf1";
-    };
-
-    configurePhase = ":";
-    buildPhase = ":";
-    installPhase = "make install DESTDIR=$out/ && cp -R $out/nix/store/*/* $out/ && rm -rf $out/nix";
-    doCheck = false;
-    propagatedBuildInputs = [ pythonPackages.pycurl ];
-
-  });
-
   logilab_astng = buildPythonPackage rec {
     name = "logilab-astng-0.24.3";