#!/bin/bash

# USAGE:
# check_systemd [UNIT ...]

FAILED=()

if ! systemctl is-system-running > /dev/null; then
	echo systemd CRITICAL: System state degraded.
	exit 2
fi

for unit in "$@"; do
	if ! systemctl is-active "$unit" > /dev/null; then
		FAILED+=("$unit")
	fi
done

if [ ${#FAILED[@]} -gt 0 ]; then
	echo "systemd CRITICAL: failed units: ${FAILED[@]}"
	exit 2
fi

echo "systemd OK: $# units checked"
exit 0