Added hadoop, spark, and variant spark+hadoop (#1833)

* Added hadoop, spark, and variant spark+hadoop

* Docstrings, dependency types, urls, copyright

* Flake8 fixes, link dependency for hadoop

* Build type for spark, env problem setting JAVA_HOME

var/spack/repos/builtin/packages/hadoop/package.py

+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Alfredo Gimenez, gimenez1@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+
+from spack import *
+
+
+class Hadoop(Package):
+    """The Apache Hadoop software library is a framework that
+    allows for the distributed processing of large data sets
+    across clusters of computers using simple programming models.
+    """
+
+    homepage = "http://hadoop.apache.org/"
+    url      = "http://mirrors.ocf.berkeley.edu/apache/hadoop/common/hadoop-2.6.4/hadoop-2.6.4.tar.gz"
+
+    version('2.6.4', '37019f13d7dcd819727be158440b9442')
+
+    depends_on('jdk', type='run')
+
+    def install(self, spec, prefix):
+
+        def install_dir(dirname):
+            install_tree(dirname, join_path(prefix, dirname))
+
+        install_dir('bin')
+        install_dir('etc')
+        install_dir('include')
+        install_dir('lib')
+        install_dir('libexec')
+        install_dir('sbin')
+        install_dir('share')

var/spack/repos/builtin/packages/spark/package.py

+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Alfredo Gimenez, gimenez1@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+
+from spack import *
+
+import shutil
+
+
+class Spark(Package):
+    """Apache Spark is a fast and general engine
+    for large-scale data processing.
+    """
+
+    homepage = "http://spark.apache.org"
+    url      = "http://mirrors.ocf.berkeley.edu/apache/spark/spark-2.0.0/spark-2.0.0-bin-without-hadoop.tgz"
+
+    variant('hadoop', default=False,
+            description='Build with Hadoop')
+
+    depends_on('jdk', type=('build', 'run'))
+    depends_on('hadoop', when='+hadoop', type=('build', 'run'))
+
+    version('2.0.0', '8a5307d973da6949a385aefb6ff747bb')
+    version('1.6.2', '304394fbe2899211217f0cd9e9b2b5d9')
+    version('1.6.1', 'fcf4961649f15af1fea78c882e65b001')
+
+    def install(self, spec, prefix):
+
+        def install_dir(dirname):
+            install_tree(dirname, join_path(prefix, dirname))
+
+        install_dir('bin')
+        install_dir('conf')
+        install_dir('jars')
+        install_dir('python')
+        install_dir('R')
+        install_dir('sbin')
+        install_dir('yarn')
+
+        # required for spark to recognize binary distribution
+        shutil.copy('RELEASE', prefix)
+
+    @when('+hadoop')
+    def setup_environment(self, spack_env, run_env):
+
+        env['JAVA_HOME'] = self.spec['jdk'].prefix
+        # spack_env.set('JAVA_HOME', self.spec['jdk'].prefix)
+
+        hadoop_bin_path = join_path(self.spec['hadoop'].prefix.bin, 'hadoop')
+        hadoop_bin = Executable(hadoop_bin_path)
+        hadoop_classpath = hadoop_bin('classpath', return_output=True)
+
+        run_env.set('SPARK_DIST_CLASSPATH', hadoop_classpath)