subunit: split package into everything and python lib

pkgs/development/libraries/subunit/default.nix

···
+{ stdenv, fetchurl, pkgconfig, check, cppunit, perl, pythonPackages }:
+
+# NOTE: for subunit python library see pkgs/top-level/python-packages.nix
+
+stdenv.mkDerivation rec {
+  name = "subunit-${version}";
+  version = "1.0.0";
+
+  src = fetchurl {
+    url = "https://launchpad.net/subunit/trunk/${version}/+download/${name}.tar.gz";
+    sha256 = "1fnhrrwww90746an2nz2kn9qdf9pklmaf5lm22gssl6648f2rp2m";
+  };
+
+  buildInputs = [ pkgconfig check cppunit perl pythonPackages.wrapPython ];
+
+  propagatedBuildInputs = with pythonPackages; [ testtools testscenarios ];
+
+  postFixup = "wrapPythonPrograms";
+
+  meta = with stdenv.lib; {
+    description = "A streaming protocol for test results";
+    homepage = https://launchpad.net/subunit;
+    license = licenses.asl20;
+    platforms = platforms.linux;
+  };
+}

pkgs/servers/samba/4.x.nix

···
 { stdenv, fetchurl, python, pkgconfig, perl, libxslt, docbook_xsl
 , docbook_xml_dtd_42, docbook_xml_dtd_45, readline, talloc, ntdb, tdb, tevent
-, ldb, popt, iniparser, pythonPackages, libbsd, nss_wrapper, socket_wrapper
+, ldb, popt, iniparser, subunit, libbsd, nss_wrapper, socket_wrapper
 , uid_wrapper, libarchive
 
 # source3/wscript optionals
···
   buildInputs = [
     python pkgconfig perl libxslt docbook_xsl docbook_xml_dtd_42
     docbook_xml_dtd_45 readline talloc ntdb tdb tevent ldb popt iniparser
-    pythonPackages.subunit libbsd nss_wrapper socket_wrapper uid_wrapper
+    subunit libbsd nss_wrapper socket_wrapper uid_wrapper
     libarchive
 
     kerberos zlib openldap cups pam avahi acl libaio fam libceph glusterfs

pkgs/top-level/all-packages.nix

···
 
   samba4 = callPackage ../servers/samba/4.x.nix {
     python = python2;
-    pythonPackages = python2Packages;
     kerberos = heimdal;
     libgcrypt = libgcrypt_1_6;
     cups = if stdenv.isDarwin then null else cups;
···
     perlBindings = true;
     pythonBindings = true;
   });
+
+  subunit = callPackage ../development/libraries/subunit { };
 
   surf = callPackage ../applications/misc/surf {
     webkit = webkitgtk2;

pkgs/top-level/python-packages.nix

···
     };
   };
 
-  subunit = stdenv.mkDerivation rec {
-    name = "subunit-${version}";
-    version = "1.0.0";
-
-    src = pkgs.fetchurl {
-      url = "https://launchpad.net/subunit/trunk/${version}/+download/${name}.tar.gz";
-      sha256 = "1fnhrrwww90746an2nz2kn9qdf9pklmaf5lm22gssl6648f2rp2m";
-    };
-
-    buildInputs = (with pkgs; [ pkgconfig check cppunit perl ]) ++ [ self.wrapPython ];
+  subunit = buildPythonPackage rec {
+    name = pkgs.subunit.name;
+    src = pkgs.subunit.src;
 
     propagatedBuildInputs = with self; [ testtools testscenarios ];
 
-    postFixup = "wrapPythonPrograms";
-
-    meta = {
-      description = "A streaming protocol for test results";
-      homepage = https://launchpad.net/subunit;
-      license = licenses.asl20;
-    };
+    meta = pkgs.subunit.meta;
   };