#!/usr/bin/env bash

set -euo pipefail

# get the hostname
if [ -s /etc/motd.name ]; then
  cat /etc/motd.name > /tmp/motd
elif [ -x /usr/bin/banner ]; then
  cat /etc/hostname | banner -w 80 > /tmp/motd
else
  cat /etc/hostname > /tmp/motd
fi
echo >> /tmp/motd

# get additional info
if [ -s /etc/motd.info ]; then
  cat /etc/motd.info >> /tmp/motd
  echo >> /tmp/motd
fi

# get currently running kernel version
uname -a >> /tmp/motd
echo >> /tmp/motd

# update package cache
set +eu
pacman -Sy 2>&1 > /dev/null
pacman -Qu > /tmp/updates
set -eu

# show updatable packages
if [ -s /tmp/updates ]; then
  echo "Package updates available:" >> /tmp/motd
  cat /tmp/updates >> /tmp/motd
  echo >> /tmp/motd
fi

if [ -x /usr/bin/arch-audit ]; then
  arch-audit -uf "%n|%c" >> /tmp/cves
  if [ -s /tmp/cves ]; then
    echo "Security updates needed:" >> /tmp/motd
    cat /tmp/cves >> /tmp/motd
  fi
else
  echo "Install arch-audit for information on CVEs." >> /tmp/motd
fi

# move all to /etc/motd
if [ -x /usr/bin/lolcat ]; then
  lolcat /tmp/motd > /etc/motd
else
  cat /tmp/motd > /etc/motd
fi

exit 0