Trying to get `ThinkingSphinx::Test.start_with_autostop` and Redis to stop when guard exits.

local_redis.rb

# -*- encoding : utf-8 -*-
module LocalRedis

  module ClassMethods

    def run_in_foreground!
      unless pid = fork
        Dir.chdir(Rails.root)
        exec(cmd)
      end
      trap_sigs(pid)
      Process.wait(pid)
    end

    def run!
      unless pid = fork
        Dir.chdir(Rails.root)
        exec(cmd)
      end
      trap_sigs(pid)
      Kernel.at_exit do
        status = $!.status if $!
        kill('TERM', pid)
        exit status if status
      end
    end

    private

    def trap_sigs(pid)
      %w(TERM INT QUIT).each do |sig|
        Signal.trap(sig) { kill(sig, pid) }
      end
    end

    def cmd
      "redis-server #{Rails.root.join('config', "redis-#{Rails.env}.conf")}"
    end

    def kill(signal, pid)
      File.delete(Rails.root.join('tmp', 'redis-test-dump.rdb')) rescue nil
      Process.kill(signal, pid)
    end
  end

  extend ClassMethods
end

spec_helper.rb

Spork.prefork do
  ENV['RAILS_ENV'] = 'test'

  # ...

  # Set up Redis.
  require 'local_redis'
  LocalRedis.run!

  # Set up ThinkingSphinx.
  require 'thinking_sphinx/test'
  ThinkingSphinx::Test.init
  ThinkingSphinx::Test.start_with_autostop

  # ...
end