new package: r-packrat

Manage the R packages your project depends on in an isolated, portable,
and reproducible way.
https://github.com/rstudio/packrat/

var/spack/repos/builtin/packages/r-packrat/package.py

@@ -0,0 +1,41 @@
+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@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 RPackrat(Package):
+    """Manage the R packages your project depends on in an isolated, portable,
+    and reproducible way."""
+
+    homepage = 'https://github.com/rstudio/packrat/'
+    url = "https://cran.r-project.org/src/contrib/packrat_0.4.7-1.tar.gz"
+
+    version('0.4.7-1', '80c2413269b292ade163a70ba5053e84')
+
+    extends('R')
+
+    def install(self, spec, prefix):
+        R('CMD', 'INSTALL',
+          '--library={0}'.format(self.module.r_lib_dir), self.stage.source_path)