#!/usr/bin/ruby
# quit unless just 1 argument (hostname) is passed
unless ARGV.length == 1
  puts "Invalid number of arguments!"
  puts "Usage: runonce.rb <hostname>"
  exit
end

def mco_retry
  rc = 0
  puts "Asking puppet to runonce multiple times ..."
  yield
  return rc
end

mco_retry {3.times { system("mco puppet runonce -F hostname=\"something\""); rc = $?.exitstatus; break if rc.zero?; sleep(30)}}