ask_for_password

# File lib/rubygems/user_interaction.rb, line 225
    def ask_for_password(question)
      return nil if not tty?

      require 'io/console'

      @outs.print(question + "  ")
      @outs.flush

      password = @ins.noecho {@ins.gets}
      password.chomp! if password
      password
    end