check_systemd

#!/usr/bin/env ruby
# Copyright 2015 Maximilian Gaß <maximilian.gass@credativ.de>
#
# Permission is hereby granted, free of charge, to any person obtaining
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# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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RETURN_CODES = {
  ok: 0,
  warning: 1,
  critical: 2,
  unknown: 3,
}

def status(status, message)
  puts "#{status.to_s.upcase}: #{message}"
  exit RETURN_CODES[status]
end

systemd_state = %x[systemctl is-system-running].chomp
if systemd_state == "degraded"
  status :critical, "state is “#{systemd_state}”"
else
  status :ok, "state is “#{systemd_state}”"
end