FR: shpool switch

[mbward]

AI Policy Ack

ACK.

What new feature do you want?

I run shpool automatically, basically exec shpool attach in my .bashrc.

Sometimes, I want to switch to a different session.

If I do shpool detach, it also results in my ssh session disconnecting.

If I do shpool attach new, it makes the new session effectively a child of the old session, so shpool attach old undesirably takes me into new.

I'd like something like shpool switch new that makes the shell attach to the new session cleanly.

Any thoughts or objections to working on this?

[ethanpailes]

This feature seems like a nice QOL improvement, but would be a bit involved to implement.

I think we can probably introduce this by making a new SessionMessage that the shpool switch process sends to the daemon. This would cause the daemon to inject a new ChunkKind variant that tells the shpool attach process to drop the current connection and reconnect to the new session name. We would want shpool switch to take all the same flags that shpool attach currently does and just forward them.

[ethanpailes]

We would definitely need to update the shpool protocol, and I'm not sure if that would cause a breaking change. Hopefully the work we did recently to improve forward compat will allow us to add new enum variants without issue, but we'll need to double check when we actually touch the code.