def add_init_service_checks(nrpe, services, unit_name, immediate_check=True):
    """
    Add checks for each service in list

    :param NRPE nrpe: NRPE object to add check to
    :param list services: List of services to check
    :param str unit_name: Unit name to use in check description
    :param bool immediate_check: For sysv init, run the service check immediately
    """
    for svc in services:
        # Don't add a check for these services from neutron-gateway
        if svc in ['ext-port', 'os-charm-phy-nic-mtu']:
            next

        upstart_init = '/etc/init/%s.conf' % svc
        sysv_init = '/etc/init.d/%s' % svc

        if host.init_is_systemd():
            nrpe.add_check(
                shortname=svc,
                description='process check {%s}' % unit_name,
                check_cmd='check_systemd.py %s' % svc
            )
        elif os.path.exists(upstart_init):
            nrpe.add_check(
                shortname=svc,
                description='process check {%s}' % unit_name,
                check_cmd='check_upstart_job %s' % svc
            )
        elif os.path.exists(sysv_init):
            cronpath = '/etc/cron.d/nagios-service-check-%s' % svc
            checkpath = '%s/service-check-%s.txt' % (nrpe.homedir, svc)
            croncmd = (
                '/usr/local/lib/nagios/plugins/check_exit_status.pl '
                '-e -s /etc/init.d/%s status' % svc
            )
            cron_file = '*/5 * * * * root %s > %s\n' % (croncmd, checkpath)
            f = open(cronpath, 'w')
            f.write(cron_file)
            f.close()
            nrpe.add_check(
                shortname=svc,
                description='service check {%s}' % unit_name,
                check_cmd='check_status_file.py -f %s' % checkpath,
            )
            # if /var/lib/nagios doesn't exist open(checkpath, 'w') will fail
            # (LP: #1670223).
            if immediate_check and os.path.isdir(nrpe.homedir):
                f = open(checkpath, 'w')
                subprocess.call(
                    croncmd.split(),
                    stdout=f,
                    stderr=subprocess.STDOUT
                )
                f.close()
                os.chmod(checkpath, 0o644)
Add checks for each service in list

    :param NRPE nrpe: NRPE object to add check to
    :param list services: List of services to check
    :param str unit_name: Unit name to use in check description
    :param bool immediate_check: For sysv init, run the service check immediately