old_contents: import os
  import shutil
  import subprocess
  
  def which(program):
      def is_exe(fpath):
          return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
  
      fpath, fname = os.path.split(program)
      if fpath:
          if is_exe(program):
              return program
      else:
          for path in os.environ["PATH"].split(os.pathsep):
              path = path.strip('"')
              exe_file = os.path.join(path, program)
              if is_exe(exe_file):
                  return exe_file
      return None
  
  
  def install(omp=False, mpi=False, phdf5=False, dagmc=False):
      # Create build directory and change to it
      shutil.rmtree('build', ignore_errors=True)
      os.mkdir('build')
      os.chdir('build')
  
      # Build in debug mode by default
      cmake_cmd = ['cmake', '-Ddebug=on']
  
      # Turn off OpenMP if specified
      if not omp:
          cmake_cmd.append('-Dopenmp=off')
  
      # Use MPI wrappers when building in parallel
      if mpi:
          os.environ['CXX'] = 'mpicxx'
  
      # Tell CMake to prefer parallel HDF5 if specified
      if phdf5:
          if not mpi:
              raise ValueError('Parallel HDF5 must be used in '
                               'conjunction with MPI.')
          cmake_cmd.append('-DHDF5_PREFER_PARALLEL=ON')
      else:
          cmake_cmd.append('-DHDF5_PREFER_PARALLEL=OFF')
  
      if dagmc:
          cmake_cmd.append('-Ddagmc=ON')
  
      # Build in coverage mode for coverage testing
      cmake_cmd.append('-Dcoverage=on')
  
      # Build and install
      cmake_cmd.append('..')
      print(' '.join(cmake_cmd))
      subprocess.check_call(cmake_cmd)
      subprocess.check_call(['make', '-j4'])
      subprocess.check_call(['sudo', 'make', 'install'])
  
  def main():
      # Convert Travis matrix environment variables into arguments for install()
      omp = (os.environ.get('OMP') == 'y')
      mpi = (os.environ.get('MPI') == 'y')
      phdf5 = (os.environ.get('PHDF5') == 'y')
  
      dagmc = (os.environ.get('DAGMC') == 'y')
  
      # Build and install
      install(omp, mpi, phdf5, dagmc)
  
  if __name__ == '__main__':
      main()
  
new_contents: import os
  import shutil
  import subprocess
  
  def which(program):
      def is_exe(fpath):
          return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
  
      fpath, fname = os.path.split(program)
      if fpath:
          if is_exe(program):
              return program
      else:
          for path in os.environ["PATH"].split(os.pathsep):
              path = path.strip('"')
              exe_file = os.path.join(path, program)
              if is_exe(exe_file):
                  return exe_file
      return None
  
  
  def install(omp=False, mpi=False, phdf5=False, dagmc=False):
      # Create build directory and change to it
      shutil.rmtree('build', ignore_errors=True)
      os.mkdir('build')
      os.chdir('build')
  
      # Build in debug mode by default
      cmake_cmd = ['cmake', '-Ddebug=on']
  
      # Turn off OpenMP if specified
      if not omp:
          cmake_cmd.append('-Dopenmp=off')
  
      # Use MPI wrappers when building in parallel
      if mpi:
          os.environ['CXX'] = 'mpicxx'
  
      # Tell CMake to prefer parallel HDF5 if specified
      if phdf5:
          if not mpi:
              raise ValueError('Parallel HDF5 must be used in '
                               'conjunction with MPI.')
          cmake_cmd.append('-DHDF5_PREFER_PARALLEL=ON')
      else:
          cmake_cmd.append('-DHDF5_PREFER_PARALLEL=OFF')
  
      if dagmc:
          cmake_cmd.append('-Ddagmc=ON')
  
      # Build in coverage mode for coverage testing
      cmake_cmd.append('-Dcoverage=on')
  
      # Build and install
      cmake_cmd.append('..')
      subprocess.check_call(cmake_cmd)
      subprocess.check_call(['make', '-j4'])
      subprocess.check_call(['sudo', 'make', 'install'])
  
  def main():
      # Convert Travis matrix environment variables into arguments for install()
      omp = (os.environ.get('OMP') == 'y')
      mpi = (os.environ.get('MPI') == 'y')
      phdf5 = (os.environ.get('PHDF5') == 'y')
      dagmc = (os.environ.get('DAGMC') == 'y')
  
      # Build and install
      install(omp, mpi, phdf5, dagmc)
  
  if __name__ == '__main__':
      main()
  
subject: Update travis-install.py