$ git clone -n https://src.fedoraproject.org/rpms/ocaml-time-now.git /var/lib/mock/f38-build-side-42-init-devel-753109-27663/root/chroot_tmpdir/scmroot/ocaml-time-now
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-753109-27663/root/chroot_tmpdir/scmroot/ocaml-time-now'...
$ git fetch origin 70f70ea62ba2a5339b15f392c35cb979f7030ed5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-time-now
 * [new ref]         70f70ea62ba2a5339b15f392c35cb979f7030ed5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70f70ea Rebuild OCaml packages for F38