From 258e3524e283abd6285b5bdb2655fa9acc1f76a9 Mon Sep 17 00:00:00 2001
From: Christine Koppelt <cko@users.noreply.github.com>
Date: Sun, 26 Mar 2017 18:17:17 +0200
Subject: [PATCH] spark: activate R backend

---
 pkgs/applications/networking/cluster/spark/default.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/applications/networking/cluster/spark/default.nix b/pkgs/applications/networking/cluster/spark/default.nix
index bdcb0a846259..7ba8a2ea1cd1 100644
--- a/pkgs/applications/networking/cluster/spark/default.nix
+++ b/pkgs/applications/networking/cluster/spark/default.nix
@@ -1,4 +1,5 @@
 { stdenv, fetchzip, makeWrapper, jre, pythonPackages
+, RSupport? true, R
 , mesosSupport ? true, mesos
 , version
 }:
@@ -30,6 +31,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ makeWrapper jre pythonPackages.python pythonPackages.numpy ]
+    ++ optional RSupport R
     ++ optional mesosSupport mesos;
 
   untarDir = "${name}-bin-${hadoopVersion}";
@@ -46,6 +48,9 @@ stdenv.mkDerivation rec {
     export SPARK_HOME="$out/lib/${untarDir}"
     export PYSPARK_PYTHON="${pythonPackages.python}/bin/${pythonPackages.python.executable}"
     export PYTHONPATH="\$PYTHONPATH:$PYTHONPATH"
+    ${optionalString RSupport
+      ''export SPARKR_R_SHELL="${R}/bin/R"
+        export PATH=$PATH:"${R}/bin/R"''}
     ${optionalString mesosSupport
       ''export MESOS_NATIVE_LIBRARY="$MESOS_NATIVE_LIBRARY"''}
     EOF
@@ -57,7 +62,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    description      = "Lightning-fast cluster computing";
+    description      = "Apache Spark is a fast and general engine for large-scale data processing";
     homepage         = "http://spark.apache.org";
     license          = stdenv.lib.licenses.asl20;
     platforms        = stdenv.lib.platforms.all;