Capistrano で対話的な？

deploy.rb

set :default_run_options, :pty => true

set(:username) { Capistrano::CLI.ui.ask('Username: ') }
set(:password) { Capistrano::CLI.password_prompt('Password: ') }

namespace :deploy do
  task :nyan, :roles => [:app] do
    run 'something interactive' do |channel, stream, output|
      Capistrano::Configuration.default_io_proc.call(channel, stream, output)
      
      channel.send_data(username + "\n") if output =~ /^Username:/
      channel.send_data(password + "\n") if output =~ /^Password:/
    end
  end
end