    # 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