$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base.git /var/lib/mock/f40-build-771983-126126/root/chroot_tmpdir/scmroot/ocaml-base
Cloning into '/var/lib/mock/f40-build-771983-126126/root/chroot_tmpdir/scmroot/ocaml-base'...
$ git fetch origin cd252f3f2d67d60797e99d7f0727c58f7c85e9f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-base
 * [new ref]         cd252f3f2d67d60797e99d7f0727c58f7c85e9f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd252f3 Rebuild for ocaml-num