Fix SIGHUP stop working with python 3.5

		# len(next_checks) is 0 when there is no package configured

		timeout = min(next_checks) if len(next_checks) > 0 else DEFAULT_CHECK_INTERVAL

		debug("waiting for %ds" % timeout)

		try:

			sleep(timeout)

		except InterruptedError:

			pass

def sighup_handler(signum, frame):

	info("SIGHUP received")

	# since python 3.5 we need to raise an exception to prevent python to EINTR

	# see https://www.python.org/dev/peps/pep-0475/

	raise InterruptedError()

def parse_argv():

	'''Parse command line arguments'''

		if geteuid() == 0:

			raise Error("Do not run as root")

		# use sighup to unblock sleep syscall

		signal(SIGHUP, lambda signum, frame: info("SIGHUP received"))

		signal(SIGHUP, sighup_handler)

		# parse command line

		args = parse_argv()

		# tell to systemd we are ready