simple chef fist-boot generator

gistfile1.rb

require 'rubygems'
require 'sinatra'
require 'json'
require 'mongoid'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db('nodes')
  config.max_retries_on_connection_failure = 1
end

class ServerType
  include Mongoid::Document
  include Mongoid::Versioning
  field :server_type, :type => String
  field :run_list, :type => Array
  index :server_type
  validates_uniqueness_of :server_type
end

get '/api/chef-first-run/:hostname' do
  status 200

  first_run = {
    'run_list' => [
      'role[base]'
    ]
  }

  # assumes <environment>-<system_type><host_number>.<datacenter>.<top_level_domain>
  expression = /^(\D+)-(\D+)(\d{2,3})\.(\w+)\.(.*)$/

  if params[:hostname].match(expression)
    environment = $1
    server_type = ServerType.where(:server_type => $2).first
    host_number = $3.to_i
    location = $4
    domain = $5

    first_run['environment'] = environment
    first_run['run_list'] << "role[#{location}]"

    unless server_type.nil?
      first_run['run_list'] += server_type.run_list
    end
  end

  body(first_run.to_json)
end

after '/api/*', :provides => :json do; end