Allow directly unlocking certain kinds of filesystems from ssh

[antifuchs]

Instead of "just" spawning a shell, it would be neat if hoopsnake could have dedicated functionality for each kind of filesystem unlocking tool there is. I'm hopeful to add:

• zfs (via zfs load-key)
• luks (via cryptsetup)

[luqasn]

I just use systemctl default to trigger the zfs keyprompt, does that not work for your usecase?

The only "annoying" thing is that hoopsnake does not close the session on me when booting continues to stage2, instead my poor ssh session gets left hanging :)

[antifuchs]

Oh yeah, for purposes of interactively unlocking the remote system, that systemctl invocation totally does the job! I was thinking more along the lines of more programmatic methods. Haven't really had to do that yet though, so it's a bit academic (:

I notice the connection hangs too, which I attribute to the service shutting down simultaneously with the tailscale service; we do call srv.Close() when the main program is terminated, but that terminates the same context that closes the tailscale connection. Oops! Think we have to split the tailscale context and the "terminate this program" context in two, so they do a staged shutdown.