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From: Elijah Newren <newren@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Phillip Wood" <phillip.wood123@gmail.com>,
	"Alex Henrie" <alexhenrie24@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 10:50:57 -0700	[thread overview]
Message-ID: <CABPp-BERS0iiiVhSsSs6dkqzBVTQgwJUjjKaZQEzRDGRUdObcQ@mail.gmail.com> (raw)
In-Reply-To: <xmqqpmvn5ukj.fsf@gitster.g>

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).

  parent reply	other threads:[~2021-07-12 17:51 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-11  1:26 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 [this message]
2021-07-12 18:20       ` Felipe Contreras
2021-07-12 18:20       ` Alex Henrie
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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