Re: Able to checkout same branch in multiple worktrees when using symbolic-refs

Austin Morton [off-list ref] writes:

[jc: swapped the blocks to chronological order, and trimmed parts
that are not relevant to this reply].

On Fri, Apr 29, 2022 at 8:19 PM Junio C Hamano [off-list ref] wrote:

quoted

Austin Morton [off-list ref] writes:

I also suspect there is no way, other than scanning _all_ the local
branches, to see if some other branch aliases the branch we are
about to check out.  It may potentially be somewhat expensive.

I don't know why you would need to scan all the local branches, unless
that is what "git worktree list" ends up doing under the hood?
...
Seems like you would "just" need to resolve the symbolic-ref in the
same way that the worktree code does when checking against existing
worktrees in find_shared_symref during checkout.

Yeah, you're right.

You would scan all the worktrees instead of asking all the
local branches "Are you a symlink that points at a branch I am about
to check out?  If so, yell loudly to stop me."

quoted

But it would be nice if it can get fixed in inexpensively.

Thanks for a report.

So, yeah, it may be doable to fix it inexpensively.

Patches welcome ;-)

Thanks.