$ git clone -n https://src.fedoraproject.org/rpms/ocaml-biniou.git /var/lib/mock/f38-build-side-42-init-devel-741001-27656/root/chroot_tmpdir/scmroot/ocaml-biniou
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-741001-27656/root/chroot_tmpdir/scmroot/ocaml-biniou'...
$ git fetch origin c7bc35d37db71c1ba4a06d070924318d5d953ac0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-biniou
 * [new ref]         c7bc35d37db71c1ba4a06d070924318d5d953ac0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7bc35d Rebuild OCaml packages for F38