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From: Anthony Sottile <asottile@umich.edu>
To: Junio C Hamano <gitster@pobox.com>
Cc: Duy Nguyen <pclouds@gmail.com>, Ben Peart <peartben@gmail.com>,
	Git Mailing List <git@vger.kernel.org>
Subject: Re: Regression `git checkout $rev -b branch` while in a `--no-checkout` clone does not check out files
Date: Thu, 3 Jan 2019 14:05:59 -0800	[thread overview]
Message-ID: <CA+dzEB=oeL2oByqiH4FeCHc29yGL2TwhmO1DKmRTDx8Xdhh=NQ@mail.gmail.com> (raw)
In-Reply-To: <xmqqwonlfm0g.fsf@gitster-ct.c.googlers.com>

On Thu, Jan 3, 2019 at 1:51 PM Junio C Hamano <gitster@pobox.com> wrote:
>
> Anthony Sottile <asottile@umich.edu> writes:
>
> > On Thu, Jan 3, 2019 at 12:26 PM Junio C Hamano <gitster@pobox.com> wrote:
> >> A "fix" to Ben's optimization for this particular case should be
> >> fairly straight-forward.  I think we have a special case in the
> >> checkout codepath for an initial checkout and disable "carry forward
> >> the fact that the user wanted all the paths removed", so it would be
> >> the matter of adding yet another condition (is_cache_unborn(), which
> >> is used to set topts.initial_checkout) to the large collection of
> >> conditions in skip_merge_working_tree().
> >
> > I think it might be simpler than that even -- the optimization treats
> > the following as equivalent when the current checked out revision is
> > deadbeef (even if the index / worktree differ), when before they were
> > not:
> >
> > - git checkout -b newbranch
> > - git checkout deadbeef -b newbranch
> >
> > If a revision is specified on the commandline it should be checked out.
>
> If it were to be a "fix", the exact same command line as people used
> to be able to use, i.e. "git checkout -b newbranch", should be made
> to do what it used to do.
>
> Forcing users to use a different command to workaround the bug is
> not a usable "fix".  If we want a working workaround, you can tell
> your users to use
>
>     git reset --hard HEAD && git checkout -b newbranch
>
> and that would already work without any code change ;-).
>
>

oh wow, I didn't realize `git checkout -b newbranch` also used to
reset the `--no-checkout` state, yeah you're right the optimization is
way more problematic than I had considered.

I'm working around by not using `--no-checkout` personally

Anthony

  reply	other threads:[~2019-01-03 22:06 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-01 23:17 Regression `git checkout $rev -b branch` while in a `--no-checkout` clone does not check out files Anthony Sottile
2019-01-02 11:08 ` Duy Nguyen
2019-01-02 16:18   ` Anthony Sottile
2019-01-03 10:04     ` Duy Nguyen
2019-01-03 20:25       ` Junio C Hamano
2019-01-03 20:35         ` Anthony Sottile
2019-01-03 21:51           ` Junio C Hamano
2019-01-03 22:05             ` Anthony Sottile [this message]
2019-01-16 14:39               ` Ben Peart
2019-01-18 18:55 ` [PATCH v1 0/2] Fix regression in checkout -b Ben Peart
2019-01-18 18:55   ` [PATCH v1 1/2] checkout: add test to demonstrate regression with checkout -b on initial commit Ben Peart
2019-01-18 19:23     ` SZEDER Gábor
2019-01-18 18:55   ` [PATCH v1 2/2] checkout: fix regression in checkout -b on intitial checkout Ben Peart
2019-01-18 20:00     ` Junio C Hamano
2019-01-19  0:52     ` SZEDER Gábor
2019-01-19  1:26   ` [PATCH v1 0/2] Fix regression in checkout -b Junio C Hamano
2019-01-21 19:50   ` [PATCH v2 " Ben Peart
2019-01-21 19:50     ` [PATCH v2 1/2] checkout: add test to demonstrate regression with checkout -b on initial commit Ben Peart
2019-01-23 17:57       ` SZEDER Gábor
2019-01-21 19:50     ` [PATCH v2 2/2] checkout: fix regression in checkout -b on intitial checkout Ben Peart
2019-01-22 14:35       ` Johannes Schindelin
2019-01-22 18:42         ` Junio C Hamano
2019-01-22 18:49         ` Jeff King
2019-01-22 18:54     ` [PATCH v2 0/2] Fix regression in checkout -b Junio C Hamano
2019-01-22 19:31       ` Ben Peart
2019-01-23 19:14         ` Junio C Hamano
2019-01-23 20:01   ` [PATCH v3 " Ben Peart
2019-01-23 20:02     ` [PATCH v3 1/2] checkout: add test demonstrating regression with checkout -b on initial commit Ben Peart
2019-01-23 20:02     ` [PATCH v3 2/2] checkout: fix regression in checkout -b on intitial checkout Ben Peart
2019-01-23 21:23     ` [PATCH v3 0/2] Fix regression in checkout -b Junio C Hamano

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