old_contents: # Copyright 2013-2020 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)
  
  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"]
  NOTAR_EXTS = ["zip", "tgz", "tbz2", "txz"]
  
  # 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 + NOTAR_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 2013-2020 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)
  
  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"]
  NOTAR_EXTS = ["zip", "tgz", "tbz2", "txz"]
  
  # 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 + NOTAR_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
      if extension and re.match(r'bz2', extension):
          bunzip2 = which('bunzip2', required=True)
          return bunzip2
      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: add support for bz2 (#15424)