CoreOS vagrant - config.rb snippet to regen token

config.rb

# init a cluster, if needed
if File.exists?('user-data')
  require 'open-uri'
  require 'yaml'

  data = YAML.load(IO.readlines('user-data')[1..-1].join)
  if data['coreos']['etcd']['discovery'].nil? and ARGV[0].eql?('up')
    token = open('https://discovery.etcd.io/new?size=3').read
    data['coreos']['etcd']['discovery'] = token
    yaml = YAML.dump(data)
    File.open('user-data', 'w') { |file| file.write("#cloud-config\n\n#{yaml}") }
  elsif not data['coreos']['etcd']['discovery'].nil? and ARGV[0].eql?('destroy')
    data['coreos']['etcd']['discovery'] = nil
    yaml = YAML.dump(data)
    File.open('user-data', 'w') { |file| file.write("#cloud-config\n\n#{yaml}") }
  end
end
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