Re: Bug? file at the same time being deleted and not registered

From: Tomas Pospisek <tpo@sourcepole.ch>
Date: May 24, 2010, 10:32 UTC
Message-ID: <alpine.DEB.2.00.1005241228100.5304@tpo-laptop>
In-Reply-To: <20100524084932.GA21051@coredump.intra.peff.net>

On Mon, 24 May 2010, Jeff King wrote:

Show 28 quoted lines

> On Mon, May 24, 2010 at 10:29:02AM +0200, Tomas Pospisek wrote:
>
>>> If it's empty or 32 bytes, then that explains what status is reporting
>>> (but the question still remains how we got into that state).
>>
>> There's no .git/index file there:
>>
>>  $ ls -l .git/
>>  total 36
>>  drwxr-xr-x 2 tpo tpo 4096 2010-05-23 21:36 branches
>>  -rw-r--r-- 1 tpo tpo    4 2010-05-23 21:36 COMMIT_EDITMSG
>>  -rw-r--r-- 1 tpo tpo   73 2010-05-23 21:36 description
>>  -rw-r--r-- 1 tpo tpo   23 2010-05-23 21:36 HEAD
>>  drwxr-xr-x 2 tpo tpo 4096 2010-05-23 21:36 hooks
>>  drwxr-xr-x 2 tpo tpo 4096 2010-05-23 21:36 info
>>  drwxr-xr-x 3 tpo tpo 4096 2010-05-23 21:36 logs
>>  drwxr-xr-x 7 tpo tpo 4096 2010-05-24 09:26 objects
>>  drwxr-xr-x 4 tpo tpo 4096 2010-05-23 21:36 refs
>
> Thanks. That means "git status" is at least reporting the right thing.
> Now we just need to figure out why, when the strace of commit shows it
> being written and renamed into place, the index file is missing.
>
> I tried setting up a simple mhddfs mount to reproduce your problem, but
> everything works fine for me. What version of mhddfs are you using? I'm
> using version 0.1.28. I wonder if git is somehow triggering an mhddfs
> bug. Looking through the svn logs for mhddfs, between 0.1.27 and 0.1.28,
> there is a commit with message "fixed rename bug".

Oh wow (trying to reproduce the bug just from the strace). It's mhddfs. Look:

$ touch bla $ touch bla.lock $ echo asdf > bla.lock $ mv bla.lock bla $ ls $ # nothing here

That's a quite catastrophic bug in mhddfs :-((( ! Argh.

Moving this over to mhddfs.

Thanks a lot Jeff! *t