Re: [PATCH] fsck: ignore missing "refs" directory for linked worktrees

[Patrick Steinhardt <ps@pks.im>]

On Mon, Jun 02, 2025 at 10:53:50AM +0100, Phillip Wood wrote:
> Hi Shejialuo
> 
> On 31/05/2025 04:39, shejialuo wrote:
> > diff --git a/refs/files-backend.c b/refs/files-backend.c
> > index 4d1f65a57a..bf6f89b1d1 100644
> > --- a/refs/files-backend.c
> > +++ b/refs/files-backend.c
> > @@ -3762,6 +3762,9 @@ static int files_fsck_refs_dir(struct ref_store *ref_store,
> >   	iter = dir_iterator_begin(sb.buf, 0);
> >   	if (!iter) {
> > +		if (errno == ENOENT && !is_main_worktree(wt))
> > +			goto out;
> > +
> >   		ret = error_errno(_("cannot open directory %s"), sb.buf);
> >   		goto out;
> >   	}
> 
> I think it would be clearer to write this as
> 
> 	if (is_main_worktree(wt) || errno != ENOENT)
> 		ret = error_errno(_("cannot open directory %s"), sb.buf);
> 	goto out;
> 
> so that the condition that triggers the error message is explicit rather
> than having to mentally invert the condition to figure out when we return an
> error

The downside though is that this mandates that `is_main_worktree()` must
never set `errno` itself. So while it may be clearer, the original
version feels safer to me.

Patrick