Re: Help with "fatal: unable to read ...." error during GC?

From: Paul Smith <paul@mad-scientist.net>
Date: Aug 8, 2018, 17:35 UTC
Message-ID: <b247434b62ccd30f32adbebb83fa6ea12b51b6ff.camel@mad-scientist.net>
In-Reply-To: <20180808160612.GC1607@sigill.intra.peff.net>

On Wed, 2018-08-08 at 12:06 -0400, Jeff King wrote:

Show 16 quoted lines

> I'd have expected fsck to find it, too. However, looking at the code,
> I'm not convinced that fsck is actually considering detached worktree
> heads properly, either. Try:
> 
>   git rev-list --all --reflog --objects >/dev/null
> 
> which I know checks worktrees correctly. I'd expect that to fail.
> 
> If it does, then we need to narrow down which worktree is corrupt.
> Perhaps something like:
> 
>   git worktree list |
>   while read worktree head junk; do
>         git rev-list --objects $head >/dev/null ||
>         echo "$worktree seems corrupt"
>   done

Thanks for the note! Unhappily for me none of these operations seem to find any actionable problems...

$ git rev-list --all --reflog --objects >/dev/null warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits warning: reflog of 'HEAD' references pruned commits $ echo $? 0

$ git worktree list | while read wt head junk; do \
  git rev-list --objects $head >/dev/null || echo "$wt seems corrupt"; \
  done
$

Just to be sure I updated the loop above to echo $wt and $head and they were correct. I also re-ran git gc after the above and still got the original error output so it didn't magically fix itself :).