How to ask for user input when running ruby code on remote server with capistrano?

Question

I want to confirm the action when running a capistrano task on a remote server:

task :do_someting do
  on roles(:primary) do
    within release_path do
      with rails_env: fetch(:rails_env) do
        execute :rails, :runner,
          %Q['require "do_something"; Do::Something.()']
      end
    end
  end
end

Where `DoSomethig looks like this:

require "highline/import"

class DoSomething

  def self.call
    query_db_for_objects.each do |obj|
      answer = ask "Are you sure to do something with #{obj}? (y/n)"
      rerun unless answer == 'y'
      do_something
    end
  end

end

Method ask from highline gem doesn't seem to work when asking from a remote server and the command bundle exec cap production do_something hangs forever.

How can I ask for a user input from a remote server when running this capistrano task?

Answer 1

I was able to read the user answer from a remote server with the following ruby code

task :do_someting do

  class ConfirmHandler
    def on_data(command, stream_name, data, channel)
      if data.to_s =~ /\?$/
        prompt = Net::SSH::Prompt.default.start(type: 'confirm')
        response = prompt.ask "Please enter your response (y/n)"
        channel.send_data "#{response}\n"
      end
    end
  end

  on roles(:primary) do
    within release_path do
      with rails_env: fetch(:rails_env) do
        execute :rails, :runner,
          %Q['require "do_something"; Do::Something.()']
      end
    end
  end

end

where Do::Something has ask_user method which looks the following way:

class Do::Something

  def self.call
    answer = ask_user
    puts "Answer is: #{answer}"
  end

  def self.ask_user
    puts 'Do something?'
    `read response; echo $response`
  end

end