chef check for checkins

#!/usr/bin/ruby

# lists hosts whose chef-client hasn't checked in with the server for a while

# how many seconds before we alert
threshold = 3600

# requires that your user account is set up for Chef's "knife" utility

me = ENV["USER"]
if not File.exists?(File.expand_path("~#{me}/.chef/knife.rb"))
  puts "Please set up knife first."
  exit 1
end

require 'rubygems'
require 'chef/rest'
require 'chef/config'
require 'chef/search/query'
require 'chef/node'

config = Chef::Config.from_file('.chef/knife.rb')
q = Chef::Search::Query.new

time_now = Time.now.to_i
time_threshold = Time.now.to_i - threshold

host_list = Array.new

# use Solr query as much as possible
q.search(:node, "ohai_time:[0 TO #{time_threshold}]") do |item|
  delay = Time.now.to_i - item[:ohai_time].to_i
  host_list.push([ item[:hostname], delay ])
end

if not host_list.empty?
  print "Chef clients that have not checked in in the last ", threshold, "s\n"
  print "\n"
  host_list.each do |item|
    print item[0], ": ", item[1], " s\n"
  end
end