Copy a given file from the cache storage

def copy_file(file_name):
	"""
	Copy a given file from the cache storage
	"""

	remote_file_path = join(join(expanduser('~'), OCTOGRID_DIRECTORY), file_name)
	current_path = join(getcwd(), file_name)

	try:
		copyfile(remote_file_path, current_path)
	except Exception, e:
		raise e