Example capistrano task to confirm deployment

deploy.rb

# drop this task in the environment(s) you want to confirm deployment for

before :deploy, "deploy:confirm"

namespace :deploy do
  desc "Should we really deploy?"
  task :confirm do
    if Capistrano::CLI.ui.ask("Are you sure?") == "yes"
      puts "You got it buddy. Imma deploy now."
    else
      puts "Whoa whoa whoa! Ok. Good thing I asked!"
      puts "Stopping!"
      exit
    end
  end
end