fixed the case where node has checked in less than 60 seconds ago

gistfile1.txt

#! /usr/bin/env ruby

# Original by Tollef Fog Heen <tfheen _at_ err.no>

require 'chef/config'
require 'chef/search/query'
require 'chef/log'
require 'time'
require 'getoptlong'
require "ohai"

RET = {
  :ok => 0,
  :warning => 1,
  :critical => 2,
  :unknown => 3,
  :dependent => 4
}

def time_period_to_s(time_period)
  out = ""
  interval_array = [ [:weeks, 604800], [:days, 86400], [:hours, 3600], [:mins, 60], [:seconds, 1] ]
  interval_array.each do |sub|
    if time_period >= sub[1] then
      time_val, time_period = time_period.divmod( sub[1] )

      time_val == 1 ? name = sub[0].to_s.singularize : name = sub[0].to_s

      ( sub[0] != :mins ? out += ", " : out += " and " ) if out != ''
      out += time_val.to_s + " #{name}"
    end
  end
  out
end

opts = GetoptLong.new(
    [ '--critical', '-c', GetoptLong::REQUIRED_ARGUMENT],
    [ '--warning', '-w', GetoptLong::REQUIRED_ARGUMENT],
    [ '--timeout', '-t', GetoptLong::REQUIRED_ARGUMENT],
    [ '--help', '-h', GetoptLong::NO_ARGUMENT],
    [ '--hostname', '-H', GetoptLong::REQUIRED_ARGUMENT],
    [ '--verbose', '-v', GetoptLong::NO_ARGUMENT],
    [ '--nodename', '-n', GetoptLong::REQUIRED_ARGUMENT],
    [ '--nodekey', '-k', GetoptLong::REQUIRED_ARGUMENT]
)

critical = 14400
warning = 3600
timeout = 10
showhelp = false
hostname = "localhost"
verbose = false
nodename = "nagios"
nodekey = "/etc/chef/nagios.pem"

begin
  opts.each do |opt, arg|
    case opt
    when "--critical"
      critical = arg
    when "--warning"
      warning = arg
    when "--timeout"
      timeout = arg
    when "--help"
      showhelp = true
    when "--hostname"
      hostname = arg
    when "--verbose"
      verbose = true
    when "--nodename"
      nodename = arg
    when "--nodekey"
      nodekey = arg
    end
  end
rescue
  showhelp = true
end

if showhelp
  puts "#{$0} [-w warning] [-c critical] [-t timeout] [-n nodename] [-k nodekey] -H host [--verbose]"
  exit 1
end

Chef::Config.from_file("/etc/chef/client.rb")
Chef::Log.level :info
if verbose
  Chef::Log.level :debug
end

Chef::Config[:node_name] = nodename
Chef::Config[:client_key] = nodekey

node = Chef::Node.load(hostname)
delta = Time.now.to_i - node["ohai_time"].to_i
ret = :ok
if delta > critical
  ret = :critical
elsif delta > warning
  ret = :warning
end
puts "Chef run freshness : #{ret.to_s.upcase}: Last check #{time_period_to_s delta} ago"
exit RET[ret]