#!/usr/bin/env bash

set -euo pipefail

readarray -t failed < <( systemctl show '*.service' \
    --state=failed --property=Names \
    | sed -r -n 's,Names=(.+)\.service,\1,p' \
    | sort
  )

if [ ${#failed[@]} -ne 0 ]; then
  printf -v list ', %s' "${failed[@]}"
  printf 'WARNING: %s failed\n' "${list:2}"
  exit 1
else
  echo "OK: no failed services"
  exit 0
fi