new_contents: ##############################################################################
  # 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 Astra(Package):
      """A Space Charge Tracking Algorithm."""
  
      homepage = "http://www.desy.de/~mpyflo/"
  
      version('2016-11-30', '17135b7a4adbacc1843a50a6a2ae2c25', expand=False,
              url='http://www.desy.de/~mpyflo/Astra_for_64_Bit_Linux/Astra')
  
      def install(self, spec, prefix):
          mkdir(prefix.bin)
          install('Astra', prefix.bin)
  
          chmod = which('chmod')
          chmod('+x', join_path(prefix.bin, 'Astra'))
  
subject: Add Astra package (#2800)