old_contents: ##############################################################################
  # Copyright (c) 2013-2018, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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
  ##############################################################################
  import re
  import os
  from itertools import product
  from spack.util.executable import which
  
  # Supported archive extensions.
  PRE_EXTS = ["tar"]
  EXTS     = ["gz", "bz2", "xz", "Z", "zip", "tgz"]
  
  # Add PRE_EXTS and EXTS last so that .tar.gz is matched *before* .tar or .gz
  ALLOWED_ARCHIVE_TYPES = [".".join(l) for l in product(
      PRE_EXTS, EXTS)] + PRE_EXTS + EXTS
  
  
  def allowed_archive(path):
      return any(path.endswith(t) for t in ALLOWED_ARCHIVE_TYPES)
  
  
  def decompressor_for(path, extension=None):
      """Get the appropriate decompressor for a path."""
      if ((extension and re.match(r'\.?zip$', extension)) or
              path.endswith('.zip')):
          unzip = which('unzip', required=True)
          unzip.add_default_arg('-q')
          return unzip
      if extension and re.match(r'gz', extension):
          gunzip = which('gunzip', required=True)
          return gunzip
      tar = which('tar', required=True)
      tar.add_default_arg('-xf')
      return tar
  
  
  def strip_extension(path):
      """Get the part of a path that does not include its compressed
         type extension."""
      for type in ALLOWED_ARCHIVE_TYPES:
          suffix = r'\.%s$' % type
          if re.search(suffix, path):
              return re.sub(suffix, "", path)
      return path
  
  
  def extension(path):
      """Get the archive extension for a path."""
      if path is None:
          raise ValueError("Can't call extension() on None")
  
      # Strip sourceforge suffix.
      if re.search(r'((?:sourceforge.net|sf.net)/.*)/download$', path):
          path = os.path.dirname(path)
  
      for t in ALLOWED_ARCHIVE_TYPES:
          suffix = r'\.%s$' % t
          if re.search(suffix, path):
              return t
      return None
  
new_contents: ##############################################################################
  # Copyright (c) 2013-2018, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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
  ##############################################################################
  import re
  import os
  from itertools import product
  from spack.util.executable import which
  
  # Supported archive extensions.
  PRE_EXTS = ["tar", "TAR"]
  EXTS     = ["gz", "bz2", "xz", "Z", "zip", "tgz"]
  
  # Add PRE_EXTS and EXTS last so that .tar.gz is matched *before* .tar or .gz
  ALLOWED_ARCHIVE_TYPES = [".".join(l) for l in product(
      PRE_EXTS, EXTS)] + PRE_EXTS + EXTS
  
  
  def allowed_archive(path):
      return any(path.endswith(t) for t in ALLOWED_ARCHIVE_TYPES)
  
  
  def decompressor_for(path, extension=None):
      """Get the appropriate decompressor for a path."""
      if ((extension and re.match(r'\.?zip$', extension)) or
              path.endswith('.zip')):
          unzip = which('unzip', required=True)
          unzip.add_default_arg('-q')
          return unzip
      if extension and re.match(r'gz', extension):
          gunzip = which('gunzip', required=True)
          return gunzip
      tar = which('tar', required=True)
      tar.add_default_arg('-xf')
      return tar
  
  
  def strip_extension(path):
      """Get the part of a path that does not include its compressed
         type extension."""
      for type in ALLOWED_ARCHIVE_TYPES:
          suffix = r'\.%s$' % type
          if re.search(suffix, path):
              return re.sub(suffix, "", path)
      return path
  
  
  def extension(path):
      """Get the archive extension for a path."""
      if path is None:
          raise ValueError("Can't call extension() on None")
  
      # Strip sourceforge suffix.
      if re.search(r'((?:sourceforge.net|sf.net)/.*)/download$', path):
          path = os.path.dirname(path)
  
      for t in ALLOWED_ARCHIVE_TYPES:
          suffix = r'\.%s$' % t
          if re.search(suffix, path):
              return t
      return None
  
subject: Support *.TAR.gz extension. (#7973)