Add Stata package (#10189)

* First draft for installing Stata 15

I've tested this works on my systems and gives a successful install of STATA 15.

* Flake8 cleanup

* Another Flake8

* Update license header

* Various improvements

A lot of improvements as suggested by @adamjstewart

* flake8 check

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

@@ -0,0 +1,104 @@
+# Copyright 2018 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
+from datetime import datetime
+
+
+class Stata(Package):
+    """STATA is a general-purpose statistical software package developed
+       by StataCorp."""
+
+# Known limitations of this installer:
+# * This really only installs the command line version of the program. To
+#   install GUI support there are extra packages needed that I can't easily
+#   test right now (should be installable via yum as a temp workaround):
+#   libgtk-x11-2.0.so libgdk-x11-2.0.so libatk-1.0.so libgdk_pixbuf-2.0.so
+#   Those libraries appear to be provided by: pango gdk-pixbuf2 gtk2
+#
+# * There are two popular environment variables that can be set, but vary from
+#   place to place, so future enhancement maybe to support STATATMP and TMPDIR.
+#
+# * I haven't tested any installer version but 15.
+
+    homepage = "https://www.stata.com/"
+    # url      = "stata"
+
+    version('15', '2486f4c7db1e7b453004c7bd3f8da40ba1e30be150613065c7b82b1915259016')
+
+    # V15 depends on libpng v12 and fails with other versions of libpng
+    depends_on('libpng@1.2.57')
+
+    # STATA is downloaded from user/pass protected ftp as Stata15Linux64.tar.gz
+    def url_for_version(self, version):
+        return "file://{0}/Stata{1}Linux64.tar.gz".format(os.getcwd(), version)
+
+    # STATA is simple and needs really just the PATH set.
+    def setup_environment(self, spack_env, run_env):
+        run_env.prepend_path('PATH', prefix)
+        run_env.prepend_path('LD_LIBRARY_PATH', self.spec['libpng'].prefix.lib)
+
+    # Extracting the file provides the following:
+    # ./unix/
+    # ./unix/linux64/
+    # ./unix/linux64/docs.taz
+    # ./unix/linux64/setrwxp
+    # ./unix/linux64/ado.taz
+    # ./unix/linux64/inst2
+    # ./unix/linux64/base.taz
+    # ./unix/linux64/bins.taz
+    # ./license.pdf
+    # ./stata15.ico
+    # ./install
+    #
+    # The installation scripts aren't really necessary:
+    # ./install is a shell script that sets up the environment.
+    # ./unix/linux64/setrwxp is a shell script that ensures permissions.
+    # ./unix/linux64/inst2 is the actual installation script.
+    #
+    # 1. There is a markfile that is the version number. Stata uses this for
+    # for doing version checks/updates.
+    # echo $(date) > installed.150
+    #
+    # 2. Then it extracts the tar.gz files: ado.taz base.taz bins.taz docs.taz
+    #
+    # 3. It copies installer scripts to root directory
+    # cp ./unix/linux64/setrwxp setrwxp
+    # cp ./unix/linux64/inst2 inst2
+    #
+    # 4. Then it checks for proper permissions:
+    # chmod 750 setrwxp inst2
+    # ./setrwxp now
+    #
+    # 5. The last step has to be run manually since it is an interactive binary
+    # for configuring the license key. Load the module and run:
+    # $ stinit
+
+    def install(self, spec, prefix):
+        bash = which('bash')
+        tar = which('tar')
+
+        # Step 1.
+        x = datetime.now()
+        with open("installed.150", "w") as fh:
+            fh.write(x.strftime("%a %b %d %H:%M:%S %Z %Y"))
+
+        # Step 2.
+        instlist = ['ado.taz', 'base.taz', 'bins.taz', 'docs.taz']
+        for instfile in instlist:
+            tar('-x', '-z', '-f', 'unix/linux64/' + instfile)
+
+        # Step 3.
+        install('unix/linux64/setrwxp', 'setrwxp')
+        install('unix/linux64/inst2', 'inst2')
+
+        # Step 4. Since the install script calls out specific permissions and
+        # could change in the future (or old versions) I thought it best to
+        # just use it.
+        bash("./setrwxp", "now")
+
+        # Install should now be good to copy into the installation directory.
+        install_tree('.', prefix)