Re: pull.rebase config option broken in 2.33.1

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On Fri, Nov 26, 2021 at 09:05:46PM +0300, Dmitry Marakasov wrote:

> * Jeff King (peff@xxxxxxxx) wrote:
> 
> > > After update from 2.33.0 to 2.33.1 the pull.rebase = true option
> > > no longer works: `git pull` no longer tries to rebase (however manual
> > > `git pull --rebase` works fine):
> > > 
> > > % git config pull.rebase
> > > true
> > > % git pull
> > > fatal: Not possible to fast-forward, aborting.
> > > % git pull --rebase
> > > Successfully rebased and updated refs/heads/local-fixes.
> > > % git pull
> > > fatal: Not possible to fast-forward, aborting.
> > > % grep -C1 rebase .git/config
> > > [pull]
> > > 	rebase = true
> > > [rebase]
> > > 	autostash = true
> > > 
> > > After downgrade to 2.33.0:
> > > 
> > > % git pull
> > > Current branch local-fixes is up to date.
> > 
> > This looks like the same bug discussed in:
> > 
> >   https://lore.kernel.org/git/CH2PR06MB650424B4205102AC6A48F489B1BD9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
> > 
> > There's a fix in that thread. It's currently in "next", but didn't quite
> > make the cutoff for the upcoming v2.34.0.
> 
> For the record, the problem is still present in 2.34.1

In the bug I linked (and what got fixed in 2.34.1), the issue is that
when the local branch is ahead of the remote, we don't say "up to date",
but complain about fast-forwards.

It's hard to tell from the output above, but it looks like you have a
case where there are new commits both locally and on the remote? In
which case a rebase would work just fine.

But why are we complaining about "not possible to fast-forward"? Testing
locally with something like:

-- >8 --
git init repo
cd repo

commit() {
	echo $1 >$1
	git add $1
	git commit -m $1
}

git checkout -b local
commit base
commit local

git checkout -b remote HEAD^
commit remote

git checkout local
git config pull.rebase true
git pull . remote
-- >8 --

shows that we do rebase. If I set:

  git config pull.ff only

then we start complaining. And that behavior did change in 2.33.1, but
I'm not sure it's wrong. We have two conflicting config options, and the
precedence for which one we pick switched.

Do you have that option set in your config? Try:

  git config --show-origin --show-scope --get-regexp 'pull\..*'

+cc Alex and Elijah from the original 3d5fc24dae (pull: abort if
--ff-only is given and fast-forwarding is impossible, 2021-07-21) in
case they have further thoughts, but I _think_ this is working as
designed.

-Peff



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