cassandra: fix cqlsh not working

Fixes #329864

pkgs/servers/nosql/cassandra/generic.nix

@@ -1,7 +1,7 @@
 { lib
 , stdenv
 , fetchurl
-, python
+, python3Packages
 , makeWrapper
 , gawk
 , bash
@@ -40,7 +40,11 @@ stdenv.mkDerivation rec {
     url = "mirror://apache/cassandra/${version}/apache-cassandra-${version}-bin.tar.gz";
   };
 
-  nativeBuildInputs = [ makeWrapper ];
+  pythonPath = with python3Packages; [ cassandra-driver ];
+
+  nativeBuildInputs = [ python3Packages.wrapPython ];
+
+  buildInputs = [ python3Packages.python ] ++ pythonPath;
 
   installPhase = ''
     runHook preInstall
@@ -98,11 +102,18 @@ stdenv.mkDerivation rec {
       fi
     done
 
-    wrapProgram $out/bin/cqlsh --prefix PATH : ${python}/bin
-
     runHook postInstall
   '';
 
+  postFixup = ''
+    # Remove cassandra bash script wrapper.
+    # The wrapper searches for a suitable python version and is not necessary with Nix.
+    rm $out/bin/cqlsh
+    # Make "cqlsh.py" accessible by invoking "cqlsh"
+    ln -s $out/bin/cqlsh.py $out/bin/cqlsh
+    wrapPythonPrograms
+  '';
+
   passthru = {
     tests =
       let