code: def cache_file(file_name):
  	
  
  	remote_file_path = join(join(expanduser('~'), OCTOGRID_DIRECTORY), file_name)
  
  	try:
  		copyfile(file_name, remote_file_path)
  	except Exception, e:
  		raise e
docs: Cache a given file for further use (by storing them on disk)