From: Brandon Williams <bmwill@google.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: Unable to de-init stubborn submodule
Date: Thu, 11 Jan 2018 09:50:35 -0800 [thread overview]
Message-ID: <20180111175035.GC91567@google.com> (raw)
In-Reply-To: <87k1woa3i9.fsf@evledraar.gmail.com>
On 01/11, Ævar Arnfjörð Bjarmason wrote:
> What if we wanted to drop sha1collisiondetection/ as a submodule and
> replace it with a copy of what's now in sha1dc/? I ran into this with
> another project, but here's a way to reproduce it on git.git:
>
> (
> rm -rf /tmp/git &&
> git clone git@github.com:git/git.git /tmp/git
> cd /tmp/git &&
> git tag nuke-before &&
> git submodule update --init &&
> git rm -r .gitmodules sha1collisiondetection &&
> git commit -m"Nuke sha1dc submodule" &&
> cp -Rvp sha1dc sha1collisiondetection &&
> git add sha1collisiondetection &&
> git commit -m"Now it's not a submodule" &&
> git tag nuke-after &&
> git reset --hard nuke-before &&
> git submodule update --init && # skip this and the below won't fail
> git reset --hard nuke-after && # Emulate someone doing a pull
> git ls-tree HEAD | grep sha1collisiondetection && # OK, shows "tree" not "commit"
> test $(git rev-parse HEAD) == $(git -C sha1collisiondetection/ log -1 --pretty=format:%H) && echo OK || echo WTF
> )
>
> This results in a really bizarre state where according to ls-tree
> sha1collisiondetection is a tree at the current commit:
>
> 040000 tree 81583289d96bdde4b366c243ab524ea28d895ea5 sha1collisiondetection
>
> But git still believes there's a submodule there for some reason, and
> shows the log for the upstream sha1collisiondetection project:
>
> git -C sha1collisiondetection/ log -1
> commit 19d97bf (HEAD, origin/master, origin/HEAD, master)
> Merge: 3f14d1b c93f0b4
> Author: Dan Shumow <shumow@gmail.com>
> Date: Sat Jul 1 12:36:15 2017 -0700
>
> Merge pull request #37 from avar/fixup-pull-request-34
>
> Fix endian detection logic for Sparc, little endian BSD etc.
>
> Doing:
>
> git submodule deinit sha1collisiondetection
>
> Does nothing to help, then I thought it might be:
>
> git config -f .git/config -l|grep ^submodule
> submodule.sha1collisiondetection.active=true
> submodule.sha1collisiondetection.url=https://github.com/cr-marcstevens/sha1collisiondetection.git
>
> But running:
>
> git config --remove-section submodule.sha1collisiondetection
>
> Doesn't help either, neither does removing the index:
>
> rm .git/index &&
> git reset --hard
>
> If you then do:
>
> rm -rf .git/modules
>
> You'll get this error:
>
> git -C sha1collisiondetection/ log -1
> fatal: Not a git repository: /tmp/git/sha1collisiondetection/../.git/modules/sha1collisiondetection
>
> But I can't see what's still referencing it.
>
> This problem is avoided if, as noted with a comment I skip:
>
> git submodule update --init
>
> But I shouldn't need to remember to de-init a submodule before moving to
> a new commit that doesn't have it, least I end up in some seemingly
> unrecoverable state.
>
> Am I missing something obvious here?
One thing you could try is adding --recurse-submodule flags to the reset
commands. IIRC reset ignores submodules unless you specify that flag.
--
Brandon Williams
next prev parent reply other threads:[~2018-01-11 17:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-11 14:12 Unable to de-init stubborn submodule Ævar Arnfjörð Bjarmason
2018-01-11 17:50 ` Brandon Williams [this message]
2018-01-11 18:17 ` Stefan Beller
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