#!/bin/sh

post_install() {
  getent group 'nbd' &> '/dev/null' || groupadd 'nbd' > '/dev/null'
  getent passwd 'nbd' &> '/dev/null' || useradd -g 'nbd' -d '/var/empty' \
    -c 'Network Block Devices' -s '/bin/nologin' 'nbd' > '/dev/null'
  nbd_shell="$(getent passwd 'ntp' | cut -d: -f7)"
  if [ "${nbd_shell}" != '/bin/nologin' ]; then
    chsh -s '/bin/nologin' 'nbd' &> '/dev/null'
  fi
}

post_upgrade(){
  post_install
}