使用反引号在Rails应用程序中启动另一个Rails服务器

Question

我目前正在开发一个Rails应用程序,它作为另一个Rails应用程序的更新程序.

我有更新过程,

• 下载新版本zip
• 提取到适当的位置
• 同步资产
• 捆绑安装
• 预编译资产
• 启动服务器 - bundle exec rails server

我在最后一步遇到了问题.

当我跑:

Dir.chdir('../other-project')
`bundle exec rails server -d -p 3000`

从更新程序应用程序,它似乎是从更新程序包中提取而不是应该从中提取的新应用程序包.

更新程序是用Rails 4编写的,它正在更新的应用程序是rails 3.

当我尝试启动服务器时,我得到以下内容:

/home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/railtie/configuration.rb:95:in `method_missing': undefined method `handlebars' for #<Rails::Application::Configuration:0x007f9de18de100> (NoMethodError)
    from /home/vagrant/apps/other-project/config/application.rb:22:in `<class:Application>'
    from /home/vagrant/apps/other-project>'
    from /home/vagrant/apps/other-project/config/application.rb:13:in `<top (required)>'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:79:in `require'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:79:in `block in server'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:76:in `tap'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:76:in `server'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /home/vagrant/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands.rb:17:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

从这个输出我可以告诉它它正试图使用​​不正确版本的铁路...

当我手动cd ../other-project,bundle exec rails server -d -p 3000它工作正常.

我可以使用任何bash技巧来解决这个问题吗？基本框是Ubuntu 14.04

谢谢!

Answer 1

好吧,我花了一个上午对此进行故障排除,我找到了解决方案!

您所要做的就是在以下位置之前设置BUNDLE_GEMFILE环境变量:

bundle exec rails server -d -p 3000

似乎Bundler需要一些帮助才能找到项目Gemfile,因为我正在尝试在当前包中启动另一个应用程序,这是我创建的用于控制此更新程序将负责更新的应用程序的类.

我很高兴地说start方法最终按预期工作!

class AppController
  @dir = Rails.root.join('../', 'Other-app/')

  def self.running?
    File.exist?("#{@dir}/tmp/pids/server.pid")
  end

  def self.start
    if running?
      puts "app already running"
    else
      Dir.chdir(@dir)
      puts "starting app..."
      `BUNDLE_GEMFILE=Gemfile bundle exec rails server -d -p 3000`
      puts "app started"
    end
  end

  def self.kill
    if not running?
      puts "app already dead"
    else
      Dir.chdir(@dir)

      puts "killing app..."
      `kill $(cat tmp/pids/server.pid)`
      puts "app dead"
    end
  end

  def self.restart
    if running?
      kill
      start
    else
      start
    end
  end
end