spark: provided-hadoop -> nixpkgs hadoop

spark should use nixpkgs provided hadoop to make it consistent
for bigger Nix hadoop + spark setup

pkgs/applications/networking/cluster/spark/default.nix

···
-{ stdenv, fetchzip, makeWrapper, jre, pythonPackages, coreutils
+{ stdenv, fetchzip, makeWrapper, jre, pythonPackages, coreutils, hadoop
 , RSupport? true, R
 , mesosSupport ? true, mesos
 , version
 }:
 
 let
-  versionMap = {
-    "2.2.1" = {
-                hadoopVersion = "hadoop2.7";
-                sparkSha256 = "10nxsf9a6hj1263sxv0cbdqxdb8mb4cl6iqq32ljq9ydvk32s99c";
-              };
-  };
+  sha256 = {
+    "1.6.3" = "142hw73wf20d846l83ydx0yg7qj5qxywm4h7qrhwnd7lsy2sbnjf";
+    "2.2.1" = "10nxsf9a6hj1263sxv0cbdqxdb8mb4cl6iqq32ljq9ydvk32s99c";
+  }.${version};
 in
 
-with versionMap.${version};
-
 with stdenv.lib;
 
 stdenv.mkDerivation rec {
···
   name = "spark-${version}";
 
   src = fetchzip {
-    url    = "mirror://apache/spark/${name}/${name}-bin-${hadoopVersion}.tgz";
-    sha256 = sparkSha256;
+    inherit sha256;
+    url    = "mirror://apache/spark/${name}/${name}-bin-without-hadoop.tgz";
   };
 
   buildInputs = [ makeWrapper jre pythonPackages.python pythonPackages.numpy ]
     ++ optional RSupport R
     ++ optional mesosSupport mesos;
 
-  untarDir = "${name}-bin-${hadoopVersion}";
+  untarDir = "${name}-bin-without-hadoop";
   installPhase = ''
     mkdir -p $out/{lib/${untarDir}/conf,bin,/share/java}
     mv * $out/lib/${untarDir}
···
     cat > $out/lib/${untarDir}/conf/spark-env.sh <<- EOF
     export JAVA_HOME="${jre}"
     export SPARK_HOME="$out/lib/${untarDir}"
+    export SPARK_DIST_CLASSPATH=$(${hadoop}/bin/hadoop classpath)
     export PYSPARK_PYTHON="${pythonPackages.python}/bin/${pythonPackages.python.executable}"
     export PYTHONPATH="\$PYTHONPATH:$PYTHONPATH"
     ${optionalString RSupport
···
     homepage         = "http://spark.apache.org";
     license          = stdenv.lib.licenses.asl20;
     platforms        = stdenv.lib.platforms.all;
-    maintainers      = with maintainers; [ thoughtpolice offline ];
+    maintainers      = with maintainers; [ thoughtpolice offline kamilchm ];
     repositories.git = git://git.apache.org/spark.git;
   };
 }