$ git clone -n https://src.fedoraproject.org/rpms/ocaml-findlib.git /var/lib/mock/f40-build-783947-133234/root/chroot_tmpdir/scmroot/ocaml-findlib
Cloning into '/var/lib/mock/f40-build-783947-133234/root/chroot_tmpdir/scmroot/ocaml-findlib'...
$ git fetch origin 6eaef8225a16ceb5b7b81ce6c2fcb5bbdbe9afdb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-findlib
 * [new ref]         6eaef8225a16ceb5b7b81ce6c2fcb5bbdbe9afdb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6eaef82 Bump and rebuild