踏み台の先のサーバーで任意のコマンドを実行し、その終了ステータスを取得する

getRemoteExitStatus.rb

require 'net/ssh'
require 'fileutils'

PASSWORD="password"
CONFIG='./config_file'

def write_config_file
  File.open(CONFIG, 'w') { |f|
    f << "Host fumidai\n"
    f << "HostName hoge\n"
    f << "User fumidai-user\n"
    f << "IdentityFile ~/Keys/id_rsa\n"
    f << "\n"
    f << "Host ikitai-server\n"
    f << "HostName fuga\n"
    f << "User ikitai-user\n"
    f << "ProxyCommand ssh -W %h:%p fumidai"
  }
end

write_config_file
result = ""
Net::SSH.start('ikitai-server', 'ikitai-user', :password=>PASSWORD, :config => CONFIG){|ssh|
  ssh.open_channel do |channel|
    channel.exec('nc -w 1 localhost 22')

    channel.on_request 'exit-status' do |ch, data|
      result = data.read_long
    end
  end
}

p result

FileUtils.rm(CONFIG, {:force => true})