Re: [PATCH v2 0/4] worktree: add lifecycle hooks

(Apologies for replying out of thread -- I have never commented on the
git mailing list before, and I found this discussion in the archive
while looking into options for my own worktree hook needs)

I have a concrete example of a motivating workflow, indeed using
agentic development and proliferous worktrees. I figure it's worth
writing in to add support for this - I'm sure I'm not the only one out
there bumping into this problem in this current era, but git
developers can only know about it if we volunteer the information!

For me, I have disk space issues that relate from the interaction of
XCode derived data and worktrees. It apparently uses the absolute path
of the worktree for the per-project build state cache by default, and
of course it by default stores a lot of this data out-of-worktree. I
think I can change this configuration, but it's worth also noting that
about a half dozen other related tools do similar things, and none of
them have any way to know when the concomitant worktree is removed or
pruned. When I remove a worktree manually, I already have a dedicated
shell script to do cleanup like this, my script does a lot of very
useful things when it gets used!! The root problem remains, that we
cannot reliably count on agents to remember to do things we tell them
to do.

Currently, this means many gigabytes need to be cleaned up manually or
agentically every day, which is annoying, time consuming, and wastes
SSD writes.

Sadly, it seems like none of the third party tools will emit events
when someone or some-thing calls `git worktree remove` or `git
worktree prune`, so there's no solid way to implement this outside
native hooks expansions.

Sincerely,
Alexander Riccio
--
"Change the world or go home."

If left to my own devices, I will build more.