Capistrano deploy.rb 无法访问阶段文件中定义的任务答案

【问题标题】：Capistrano deploy.rb can't access task defined in stage fileCapistrano deploy.rb 无法访问阶段文件中定义的任务
【发布时间】：2015-03-29 00:22:48
【问题描述】：

我正在尝试为我的应用程序组合一个 capistrano 配方，该配方基本上在本地克隆 git 存储库，进行一些构建处理，然后 rsync 到远程服务器。

我有 2 个环境 - dev 和 prod：

deploy.rb
deploy/dev.rb
deploy/prod.rb

我收到此错误：

$ cap dev deploy 
(Backtrace restricted to imported tasks)
cap aborted!
Don't know how to build task 'stop_server'

Tasks: TOP => dev
(See full trace by running task with --trace)

如果部署在dev.rb 的同一命名空间（部署）中，为什么部署不知道如何构建任务stop_server？

Capfile

# Load DSL and set up stages
require 'capistrano/setup'

# Include default deployment tasks
#require 'capistrano/deploy' # COMMENTED OUT B/C I'M TRYING TO BUILD LOCALLY INSTEAD OF DOING A GIT CLONE ON THE REMOTE SERVER

# Load custom tasks from `lib/capistrano/tasks' if you have any defined
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

部署.rb

# config valid only for current version of Capistrano
lock '3.3.5'

set :repo_url, 'mygiturl'

# Default value for :pty is false
set :pty, true

set :deploy_dir, Dir.pwd
set :tmp_dir, "#{fetch(:deploy_dir)}/tmp"
set :output_dir, "#{fetch(:deploy_dir)}/output"

namespace :deploy do

  desc 'Kick off the deploy'
  task :init do
    invoke 'deploy:create_tmp_dir'
  end

  ... other tasks...


  after :create_tmp_dir, :fetch_code
  after :fetch_code, :build
  after :build, :move_output
  after :move_output, :stop_server

end

desc 'Deploy a new release'
task :deploy do
  invoke 'deploy:init'
end

dev.rb

role :app, fetch(:application)
role :web, fetch(:application)
role :db,  fetch(:application)

set :application, 'myapp'
set :env, 'dev'
set :ip, '123.456.78.901'
set :user, 'myuser'

set :deploy_to, '/var/www/myapp'

set :ssh_options, {
  user: fetch(:user),
  keys: %w(~/.ssh/id_rsa),
  forward_agent: true,
  auth_methods: %w(publickey),
  port: 22
}


namespace :deploy do

  desc "Stops the node forever server"
  task :stop_server do
    on roles(:app) do
      puts '**** STOPPING THE NODE SERVER *****'
      execute 'sudo /etc/init.d/myapp stop; true' # The "; true" ignores any error that may occur if there is no forever process running
    end
  end

  desc "Restarts the forever server"
  task :start_server do
    on roles(:app) do
      puts '**** STARTING THE NODE SERVER *****'
      execute 'sudo /etc/init.d/myapp start'
    end
  end

end

【问题讨论】：

标签： ruby capistrano capistrano3

【解决方案1】：

问题是Capistrano首先加载deploy.rb进行初始化；然后加载dev.rb。

Capistrano 解析此行时：

after :move_output, :stop_server

它不知道:stop_server 指的是什么（因为它还没有加载dev.rb）。因此，您看到的错误消息：

Don't know how to build task 'stop_server'

一个简单的解决方法是在deploy.rb 中声明一个空的:stop_server 任务。

namespace :deploy do
  # "stub" the task, to be defined later in dev.rb
  task :stop_server
  after : move_output, :stop_server
end

然后当 Capistrano 稍后加载 dev.rb 时，:stop_server 的真正实现将被插入。

现在，当您运行 cap dev deploy 时，您应该会得到想要的结果。

【讨论】：