Support ssh gateway

[rteabeault]

For us we have a CI pipeline that deploys to production. We have jenkins slaves which ssh to the production through a bastion host. Our current deployment code (non-chef) uses Net::SSH::Gateway to accomplish this. knife ssh has a -G flag for using an ssh gateway. It would be great if ridley-connectors also supported this. I would love to get this added and then add support to motherbrain.

Here is how knife parses the gateway param user@some_host:1234

if config[:ssh_gateway]
  gw_host, gw_user = config[:ssh_gateway].split('@').reverse
  gw_host, gw_port = gw_host.split(':')
  gw_opts = gw_port ? { :port => gw_port } : {}

  session.via(gw_host, gw_user || config[:ssh_user], gw_opts)
end

[rteabeault]

I got the gateway connections working. I am now trying to figure out the best way to deal with

https://github.com/RiotGames/ridley-connectors/blob/master/lib/ridley-connectors/host_commander.rb#L172-L187

You can't do the Celluloid::IO::TCPSocket through to the gateway or at least I don't think you can.