post_install(){
  # new password and equal group allocated in system range
  usr/bin/getent passwd lldpd >/dev/null 2>&1 || \
  usr/bin/useradd  -K SYS_UID_MIN=100 -K SYS_UID_MAX=499 \
                   -K SYS_GID_MIN=100 -K SYS_GID_MAX=499 \
                   -K USERGROUPS_ENAB=yes -r -U -d /run/lldpd -s /bin/false lldpd
}

post_upgrade(){
  local changed
  # old user name and group was _lldpd
  usr/bin/getent passwd _lldpd >/dev/null 2>&1 && usr/bin/userdel  _lldpd
  usr/bin/getent group  _lldpd >/dev/null 2>&1 && usr/bin/groupdel _lldpd
  # get rid of old 142 uid and gid
  usr/bin/getent passwd 142 >/dev/null 2>&1 && usr/bin/userdel  lldpd
  usr/bin/getent group  142 >/dev/null 2>&1 && usr/bin/groupdel lldpd
  # new password and equal group allocated in system range
  usr/bin/getent passwd lldpd >/dev/null 2>&1 || {
    usr/bin/useradd  -K SYS_UID_MIN=100 -K SYS_UID_MAX=499 \
                     -K SYS_GID_MIN=100 -K SYS_GID_MAX=499 \
                     -K USERGROUPS_ENAB=yes -r -U -d /run/lldpd -s /bin/false lldpd
    echo "==> lldpd uid/gid could have changed"
    echo "==> consider $> systemctl try-restart lldpd.service"
  }
}

post_remove(){
  usr/bin/getent passwd lldpd >/dev/null 2>&1 && usr/bin/userdel  lldpd
  usr/bin/getent group  lldpd >/dev/null 2>&1 && usr/bin/groupdel lldpd
}