Michael Haggerty <mhag...@alum.mit.edu> writes:
> When investigating the exact semantics of tag-following, I discovered
> that the tag auto-following behavior of "git fetch" is more ambitious
> than I would have expected: it fetches any tag that references an object
> that is known to the local repository, *even if that object is not
> currently reachable* (i.e., neither reachable before the fetch or after
> the fetch of non-auto-followed references). This makes it hard to
> renounce interest in a branch.
> Suppose there is a remote repo with
> o---o---o <- master
> o---A---B <- pu
> When I clone this repo, of course I get all of the commits and both
> Now suppose I decide I'm not interested in "branch" anymore, so I delete
> its remote-tracking branch from my repository and change the config to
> only fetch "master":
> git config remote.origin.fetch \
> git update-ref -d refs/remotes/origin/pu
> It looks like I'm free of the "pu" branch, right?
> But if a week later somebody pushes a tag "t" to origin that points at
> commit A, and then I do
> git fetch origin
> then Git (un)helpfully fetches tag "t" into my repo, because even though
> commit "A" isn't reachable in my repo, it hasn't been pruned yet from
> the object database.
> I admit this is not likely to be a serious problem in practice, but I
> found it surprising and strangely disturbing. I would call it a bug.
Sounds like a bug to me. Does upload-pack to pack-object codepath
actually pack the tag object and give it to you, or is it done all
by reconnecting an existing and dangling tag back to your ref
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