Re: [PATCH 04/10] fast-export: avoid dying when filtering by paths and old tags exist

> > +		git fast-export --tag-of-filtered-object=rewrite --all -- bar >output &&
> > +		grep -A 1 refs/tags/v0.0.0.0.0.0.1 output | grep -E ^from.0{40}
> 
> I don't think "grep -A" is portable (and we don't seem to otherwise use
> it). You can probably do something similar with sed.
> 
> Use $ZERO_OID instead of hard-coding 40, which future-proofs for the
> hash transition (though I suppose the hash is not likely to get
> _shorter_ ;) ).