From: Alex Henrie <alexhenrie24@gmail.com>
To: Elijah Newren <newren@gmail.com>
Cc: "Junio C Hamano" <gitster@pobox.com>,
"Phillip Wood" <phillip.wood123@gmail.com>,
"Git Mailing List" <git@vger.kernel.org>,
"Ævar Arnfjörð" <avarab@gmail.com>,
"Felipe Contreras" <felipe.contreras@gmail.com>
Subject: Re: [PATCH] pull: abort if --ff-only is given and fast-forwarding is impossible
Date: Mon, 12 Jul 2021 12:20:01 -0600 [thread overview]
Message-ID: <CAMMLpeRX3iMwT9NJ+ULHgAhS3A=nAybgDYFHomkY3sif-H+F4g@mail.gmail.com> (raw)
In-Reply-To: <CABPp-BERS0iiiVhSsSs6dkqzBVTQgwJUjjKaZQEzRDGRUdObcQ@mail.gmail.com>
On Mon, Jul 12, 2021 at 11:51 AM Elijah Newren <newren@gmail.com> wrote:
>
> On Mon, Jul 12, 2021 at 10:08 AM Junio C Hamano <gitster@pobox.com> wrote:
> >
> > Phillip Wood <phillip.wood123@gmail.com> writes:
> >
> > > Thanks for revising this patch, I like this approach much better. I do
> > > however have some concerns about the interaction of pull.ff with the
> > > rebase config and command line options. I'd naively expect the
> > > following behavior (where rebase can fast-forward if possible)
> > >
> > > pull.ff pull.rebase commandline action
> > > only not false rebase
> > > only not false --no-rebase fast-forward only
> > > * not false --ff-only fast-forward only
> > > only not false --ff merge --ff
> > > only not false --no-ff merge --no-ff
> > > only false fast-forward only
> > > only false --rebase rebase
> > > only false --ff merge --ff
> > > only false --no-ff merge --no-ff
> >
> > Do you mean by "not false" something other than "true"? Are you
> > trying to capture what should happen when these configuration
> > options are unspecified as well (and your "not false" is "either set
> > to true or unspecified")? I ask because the first row does not make
> > any sense to me. It seems to say
> >
> > "If pull.ff is set to 'only', pull.rebase is not set to 'false',
> > and the command line does not say anything, we will rebase".
>
> I think Phillip is trying to answer what to do when pull.ff and
> pull.rebase conflict. If I read his "not false" means "is set to
> something other than false", then I agree with his table, but I think
> he missed covering some cases.
>
> I think his table says that pull.rebase=false cannot conflict with
> pull.ff settings, but any other value for pull.rebase can. That makes
> sense to me.
>
> I'd similarly say that pull.ff=true cannot conflict with any
> pull.rebase settings...but that both pull.ff=only AND pull.ff=false
> conflict with pull.rebase={true,merges}.
>
> My opinion would be:
> * conflicting command line flags results in the last one winning.
> * --no-rebase makes pull.ff determine the action.
> * --ff makes pull.rebase determine the action.
> * any other command line flag (-r|--rebase|--no-ff|--ff-only)
> overrides both pull.ff and pull.rebase
> * If no command line option is given, and pull.ff and pull.rebase
> conflict, then error out.
>
> I believe my recommendation above is consistent with every entry in
> Phillip's table except the first line (where I suggest erroring out
> instead).
I'm not sure that --no-ff should imply --no-rebase because `git
rebase` actually has a --no-ff option to rewrite commits even when
fast-forwarding is possible. And it's not really necessary to make
--ff-only imply --no-rebase because we're going to make `git pull`
handle --ff-only itself without invoking `git merge`. However, the
rest of this proposal could be implemented in a straightforward manner
by making --rebase on the command line imply --ff, and I think that
would be a fine solution.
-Alex
next prev parent reply other threads:[~2021-07-12 18:20 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-11 1:26 [PATCH] pull: abort if --ff-only is given and fast-forwarding is impossible Alex Henrie
2021-07-11 17:08 ` Felipe Contreras
2021-07-11 20:00 ` Alex Henrie
2021-07-11 21:41 ` Felipe Contreras
2021-07-12 10:21 ` Phillip Wood
2021-07-12 16:04 ` Felipe Contreras
2021-07-12 16:29 ` Alex Henrie
2021-07-12 17:43 ` Felipe Contreras
2021-07-12 17:08 ` Junio C Hamano
2021-07-12 17:30 ` Felipe Contreras
2021-07-12 17:50 ` Elijah Newren
2021-07-12 18:20 ` Felipe Contreras
2021-07-12 18:20 ` Alex Henrie [this message]
2021-07-12 18:24 ` Alex Henrie
2021-07-12 19:55 ` Junio C Hamano
2021-07-12 20:19 ` Felipe Contreras
2021-07-12 20:51 ` Elijah Newren
2021-07-12 23:00 ` Junio C Hamano
2021-07-12 23:05 ` Felipe Contreras
2021-07-12 23:24 ` Elijah Newren
2021-07-12 20:37 ` Elijah Newren
2021-07-12 21:06 ` Felipe Contreras
2021-07-12 17:54 ` Phillip Wood
2021-07-14 8:37 ` Son Luong Ngoc
2021-07-14 15:14 ` Felipe Contreras
2021-07-14 15:22 ` Elijah Newren
2021-07-14 17:19 ` Junio C Hamano
2021-07-14 17:31 ` Felipe Contreras
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