cron_fetcher.rb

require 'lockfile'

def timestamp
  Time.now.strftime('%x %X')
end

begin
  Lockfile.new('cron_mail_fetcher.lock', :retries => 0) do
    config = YAML.load_file("#{RAILS_ROOT}/config/mailer_daemon.yml")
    config = config[RAILS_ENV].to_options
    puts "#{timestamp}: Running MailFetcher in #{RAILS_ENV} mode"
    options = { :receiver => IncomingMailHandler }
    fetcher = Fetcher.create(options.merge(config))
    fetcher.fetch
    puts "#{timestamp}: Finished running MailFetcher in #{RAILS_ENV} mode"
  end
rescue Lockfile::MaxTriesLockError => e
  puts "#{timestamp}: Another fetcher is already running. Exiting."
end