#!/usr/bin/env bash

post_install() {
  if ! grep "br_netfilter" /proc/modules; then
    echo "Load the br_netfilter kernel module or reboot: modprobe br_netfilter."
  fi
  if [[ $(swapon --noheadings | wc -l) -ne 0 ]]; then
    echo "WARNING: Disable swap before using kubelet.service."
  fi
}

post_upgrade() {
  local _changelog_121="https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.21.md#no-really-you-must-read-this-before-you-upgrade"
  if [[ "$(vercmp "$2" "1.21.0-1")" -lt 0 ]]; then
    printf "WARNING: Read important changelog notice:\n"
    printf "         %s\n" "${_changelog_121}"
  fi
}