Re: should git maintenance prefetch be taught to honor remote.fetch refspec?
On Thu, Apr 01, 2021 at 01:14:05PM -0700, Junio C Hamano wrote:
Show 37 quoted lines
> Derrick Stolee <stolee@gmail.com> writes:
>
> > On 4/1/2021 2:49 PM, Tom Saeger wrote:
> >> I've recently setup git maintenance and noticed prefetch task
> >> fetches ALL remote refs (well not tags) and does not honor
> >> remote fetch config settings.
> >
> > This is intentional. The point is to get the latest objects
> > without modifying any local copies of refs. You still need
> > to run "git fetch" manually to update the refs, but that
> > should be faster because you have most of the objects already
> > in your copy of the repository.
>
> You answered only half of the question, I think.
>
> The plain vanilla refspec after you clone would be
>
> [remote "origin"]
> fetch = +refs/heads/*:refs/remotes/origin/*
>
> and "maintenance prefetch" intentionally redirect the destination
> part away from refs/remotes/origin/ to avoid disrupting the
> reference to @{upstream} etc. that are used locally. And
> intentionally doing so is good.
>
> But imagine you are tracking my 'todo' branch which has nothing
> common with the history of Git. You'd have
>
> [remote "origin"]
> url = git://git.kernel.org/pub/scm/git/git.git
> fetch = +refs/heads/todo:refs/remotes/origin/todo
>
> If "maintenance prefetch" does "+refs/heads/*:refs/prefetch/origin/*",
> you'd end up the history of Git, which is not interesting for you who
> are only interested in the 'todo' branch (to be checked out in the
> Meta subdirectory to use Meta/cook script or read Meta/whats-cooking.txt
> file).Show 5 quoted lines
>
> So, redirecting the right-hand of configured refspec is a good idea;
> not copying the left-hand of configured refspec, and unconditionally
> using "refs/heads/*" is not.
>
And multiple values can be set for remote.remotename.fetch
Behavior equivalent to:
git remote | while read -r remote; do
refspecs=$(
git config --get-all "remote.${remote}.fetch" \
| sed 's#refs/remotes/#refs/prefetch/#' \
| xargs)
git fetch "${remote}" --prune --no-tags --no-write-fetch-head --recurse-submodules=no --refmap= --quiet ${refspecs};
done