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From: Elijah Newren <newren@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
	"Ævar Arnfjörð" <avarab@gmail.com>,
	corrmage@gmail.com, "Git Mailing List" <git@vger.kernel.org>,
	"Stefan Beller" <sbeller@google.com>
Subject: Re: A rebase regression in Git 2.18.0
Date: Thu, 30 Aug 2018 09:41:16 -0700
Message-ID: <CABPp-BH8-1YQ49aaM-dXkT9ukKO92MF-FZ2kLwd=KHe4TVbjqQ@mail.gmail.com> (raw)
In-Reply-To: <xmqqh8jeh1id.fsf@gitster-ct.c.googlers.com>

On Tue, Aug 28, 2018 at 9:58 AM Junio C Hamano <gitster@pobox.com> wrote:
>
> Elijah Newren <newren@gmail.com> writes:
>
> >   - Add a flag to turn off directory rename detection, and set the
> > flag for every call from am.c in order to avoid problems like this.
>
> I'd say this is the only practical solution, before you deprecate
> the "pipe format-patch output to am -3" style of "git rebase" (and
> optionally replace with something else).

I posted a patch a while back to add an --am flag to "git rebase",
make "--am" be implied by options which are still am-specific
(--whitespace, --committer-date-is-author-date, and -C), and change
--merge to be the default.

I'll post it as an RFC again after the various rebase-rewrite series
have settled and merged down...along with my other rebase cleanups
that I was waiting on to avoid conflicts with GSoC stuff.

> The whole point of "am -3" is to do _better_ than just "patch" with
> minimum amount of information available on the pre- and post- image
> blobs, without knowing the remainder of the tree that the patch did
> not touch.  It is not surprising that the heuristics that look at
> the unchanging part of the tree to infer renames that may or may not
> exist guesses incorrectly, either with false positive or negative.
> In the context of "rebase", we always have all the trees that are
> involved.  We should be able to do better than "am -3".

  parent reply	other threads:[~2018-08-30 16:41 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-28 12:27 Nikolay Kasyanov
2018-08-28 13:17 ` Ævar Arnfjörð Bjarmason
2018-08-28 13:33   ` Johannes Schindelin
2018-08-28 13:46     ` Nikolay Kasyanov
2018-08-28 15:35     ` Elijah Newren
2018-08-28 16:58       ` Junio C Hamano
2018-08-29  7:06         ` [PATCH 0/3] Turn off directory rename detection in am -3 Elijah Newren
2018-08-29  7:06           ` [PATCH 1/3] t3401: add another directory rename testcase for rebase and am Elijah Newren
2018-08-29 22:12             ` Junio C Hamano
2018-08-29 23:47               ` Elijah Newren
2018-08-30 16:01                 ` Junio C Hamano
2018-08-30 16:26                   ` Elijah Newren
2018-08-29  7:06           ` [PATCH 2/3] merge-recursive: add ability to turn off directory rename detection Elijah Newren
2018-08-29 12:54             ` Johannes Schindelin
2018-08-29 23:00               ` Elijah Newren
2018-08-29  7:06           ` [PATCH 3/3] am: avoid directory rename detection when calling recursive merge machinery Elijah Newren
2018-08-29 12:51             ` Johannes Schindelin
2018-08-30 16:41         ` Elijah Newren [this message]
2018-08-31 10:11           ` A rebase regression in Git 2.18.0 Johannes Schindelin
2018-08-31 19:37             ` Elijah Newren

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