warning: ignoring unknown core.fsync component 'true'

> For a specific git repo, when I clone or fetch the repo, I encounters the
> warning
> 
> remote: warning: ignoring unknown core.fsync component 'true'
> remote: Enumerating objects: 41, done.
> remote: Total 41 (delta 0), reused 0 (delta 0), pack-reused 41
> Unpacking objects: 100% (41/41), 37.51 MiB | 10.91 MiB/s, done.
> 
> But after clone the repo, I didn't see core.fsync in my .git/config. And
> there isn't anything relates core.fsync.

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> Hi Jinfeng,
>
> On Wed, Jul 23, 2025 at 11:07:37AM +0800, Wang, Jinfeng (CN) wrote:
>> For a specific git repo, when I clone or fetch the repo, I encounters the
>> warning
>>
>> remote: warning: ignoring unknown core.fsync component 'true'
>> remote: Enumerating objects: 41, done.
>> remote: Total 41 (delta 0), reused 0 (delta 0), pack-reused 41
>> Unpacking objects: 100% (41/41), 37.51 MiB | 10.91 MiB/s, done.
>>
>> But after clone the repo, I didn't see core.fsync in my .git/config. And
>> there isn't anything relates core.fsync.
> The problem doesn't exist on the client-side, but rather on the remote
> as indicated by the "remote: " prefix. So there's nothing you can do on
> the client-side to address the problem, you'll have to reach out to the
> admin of that repository and tell them that the repository uses an
> invalid value for "core.fsync".
>
>> I also tried git with different version (2.25.1 and 2.34.1) to clone the
>> repo, both will show this warning. What configuration causes this warning?
> It's "core.fsync" indeed, but not on your side. The config does not take
> a boolean, but rather a list of components that should use fsync. I
> guess the admin wanted to just fsync everything, but in that case you
> don't want "core.fsync=true" but "core.fsync=all".
>
> Patrick