如何在自定义capistrano任务中使用交易？ [英] How do I use transactions within custom capistrano tasks?

问题描述

我正在编写一个自定义的capistrano任务来缩小我的javascripts，并希望通过回滚部署来处理minify失败的情况。

I'm writing a custom capistrano task to minify my javascripts and want to handle the case where the minification fails by rolling back the deploy.

我已经通过文档和思考，我想出了如何做到这一点，但它对我来说不起作用。

I've been through the documentation and thought I'd figured out how to do it, but it's not working for me.

这是我有的：

desc 'Minify all javascript files'
task :bundle, :roles => :app, :except => { :no_release => true } do
  on_rollback do
    run "rm #{current_path}/public/javascripts/all.js"
    puts "ROLLBACK"
  end 

  transaction do
    run "cd #{current_path}; RAILS_ROOT=#{current_path} rake bundle:js"
  end 
end 

after 'deploy:update', 'deploy:bundle'

当我运行 cap staging deploy：bundle 并将其设置为失败，我得到以下输出：

When I run cap staging deploy:bundle and set it up to fail, I get the following output:

    triggering start callbacks for `staging'
  * executing `staging'
    triggering start callbacks for `deploy:bundle'
  * executing `multistage:ensure'
  * executing `deploy:bundle'
 ** transaction: start
  * executing "cd /path/to/app/current; RAILS_ROOT=/path/to/app/current rake bundle:js"
    servers: ["example.com"]
    [example.com] executing command
*** [err :: example.com] rake aborted!
*** [err :: example.com] invalid byte sequence in US-ASCII
# Trace here - removed for brevity
    command finished
failed: "sh -c 'cd /path/to/app/current; RAILS_ROOT=/path/to/app/current rake bundle:js'" on example.com

所以它在交易中是，但是我的 on_rollback 钩子没有运行。它似乎知道任务失败，因为它输出失败在最后 - 即使我没有提出例外。

So it is in a transaction, but my on_rollback hook doesn't get run. It does seem to know the task failed, as it outputs failed at the end - even though I haven't raised an exception.

关于为什么我的 on_rollback 没有运行的任何想法？

Any ideas as to why my on_rollback isn't running?

推荐答案

查看示例

task :deploy do
  transaction do
    update_code
    symlink
  end
end

task :update_code do
  on_rollback { run "rm -rf #{release_path}" }
  source.checkout(release_path)
end
...

我想知道on_rollback调用是不应该在事务块里面的，如

I wonder if the on_rollback call shouldn't go inside the transaction block, like

  transaction do
    on_rollback do
      run "rm #{current_path}/public/javascripts/all.js"
      puts "ROLLBACK"
    end 
    run "cd #{current_path}; RAILS_ROOT=#{current_path} rake bundle:js"
  end  

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