# File lib/fog/core/ssh.rb, line 40
      def initialize(address, username, options)
        require 'net/ssh'

        key_manager = Net::SSH::Authentication::KeyManager.new(nil, options)

        unless options[:key_data] || options[:keys] || options[:password] || key_manager.agent
          raise ArgumentError.new(':key_data, :keys, :password or a loaded ssh-agent is required to initialize SSH')
        end

        if options[:key_data] || options[:keys]
          options[:keys_only] = true
          #Explicitly set these so net-ssh doesn't add the default keys
          #as seen at https://github.com/net-ssh/net-ssh/blob/master/lib/net/ssh/authentication/session.rb#L131-146
          options[:keys] = [] unless options[:keys]
          options[:key_data] = [] unless options[:key_data]
        end

        @address  = address
        @username = username
        @options  = { :paranoid => false }.merge(options)
      end