Enable reverse forwarding of portForwards

[afbjorklund]

By default, the portForwards will be forwarded
from local (host) to remote (guest). Flag: -L

With reverse, the portForwards will be forwarded
from remote (guest) to local (host). Flag: -R

Only implemented for unix sockets at the moment.

I kept the confusing wording, of the logging entries.

Issue #834

Tested by forwarding a memcached socket from the host.

memcached -s mc.sock

portForwards:
 - guestSocket: "/tmp/mc.sock"
   hostSocket: "{{.Home}}/mc.sock"
   reverse: true

lima sudo apt install -y libmemcached-tools
lima MEMCACHED_SERVERS=/tmp/mc.sock memcping

---

ssh says:

-L local_socket:remote_socket
Specifies that connections to the given TCP port or Unix socket on the local (client) host are to be forwarded to the given host and port, or Unix socket, on the remote side.
i.e. from host, to guest
-R remote_socket:local_socket
Specifies that connections to the given TCP port or Unix socket on the remote (server) host are to be forwarded to the local side.
i.e. from guest, to host

lima says:

reverse: false
logrus.Infof("Forwarding %q (guest) to %q (host)", remote, local)
reverse: true
logrus.Infof("Forwarding %q (host) to %q (guest)", local, remote)

[AkihiroSuda]

Thanks

[jandubois]

Only implemented for unix sockets at the moment.

I think the "documentation" in default.yaml should mention that this option is only supported for unix sockets, and the code in pkg/limayaml/validate.go should throw an error when it is set for regular TCP ports.

[jandubois]

Thanks, LGTM, but I only read the code, I didn't actually test it.