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Re: [PATCH 0/3] git worktree prune improvements

On Sat, Mar 3, 2018 at 9:21 PM, Randall S. Becker
<rsbecker@xxxxxxxxxxxxx> wrote:
> On March 2, 2018 10:39 PM, Nguy?n Thái Ng?c Duy wrote:
>> This is something we could do to improve the situation when a user manually
>> moves a worktree and not follow the update process (we have had the first
>> reported case [1]). Plus a bit cleanup in gc.
>> I think this is something we should do until we somehow make the user
>> aware that the worktree is broken as soon as they move a worktree
>> manually. But there's some more work to get there.
>> [1] http://public-inbox.org/git/%3Caa98f187-4b1a-176d-2a1b-
>> 826c995776cd@xxxxxxxxx%3E
> I wonder whether the OT thread discussion about branch annotation may have some value here. For some repositories I manage, I have received questions about whether there was some way to know that a branch in the clone was associated with a worktree "at any point in the past", which, once the worktree has been pruned, is not derivable in a formal computational sense - there may be specific conditions where it is. Perhaps, if that line of development moves forward, that we should considering annotating the worktree-created branch to help with our pruning process and to identify where the branch originated.

I think for pruning, we already have that information. If a branch is
associated to a worktree, its HEAD must say so and we must not prune
anything reachable from _any_ HEAD. I made that mistake actually.
Still in process of fixing it (and fsck).