mathematica: new package at 12.0.0 (#11509)

* mathematica: new package at 12.0.0

* mathematica: add missing os import

* mathematica: fix url format

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

@@ -0,0 +1,39 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+import os
+
+
+class Mathematica(Package):
+    """Mathematica: high-powered computation with thousands of Wolfram Language
+       functions, natural language input, real-world data, mobile support.
+
+       Note: A manual download is required for Mathematica.
+       Spack will search your current directory for the download file.
+       Alternatively, add this file to a mirror so that Spack can find it.
+       For instructions on how to set up a mirror, see
+       http://spack.readthedocs.io/en/latest/mirrors.html"""
+
+    homepage = "https://www.wolfram.com/mathematica/"
+    url = 'file://{0}/Mathematica_12.0.0_LINUX.sh'.format(os.getcwd())
+
+    version('12.0.0', sha256='b9fb71e1afcc1d72c200196ffa434512d208fa2920e207878433f504e58ae9d7',
+            expand=False)
+
+    def install(self, spec, prefix):
+        sh = which('sh')
+        sh(self.stage.archive_file, '--', '-auto', '-verbose',
+           '-targetdir={0}'.format(prefix),
+           '-execdir={0}'.format(prefix.bin),
+           '-selinux=y')
+
+        # after the install phase completes, spack tries to install build.out
+        # into <prefix>/.spack, but the .spack dir will not exist, causing the
+        # build to fail. package.py:1690 seems to show that the dir is created
+        # right before writing build.out -- possible bug?
+
+        # creating the .spack dir right after installing prevents explosions
+        mkdirp(join_path(prefix, '.spack'))