$ git clone -n https://src.fedoraproject.org/rpms/ocaml-calendar.git /var/lib/mock/f41-build-811826-147589/root/chroot_tmpdir/scmroot/ocaml-calendar
Cloning into '/var/lib/mock/f41-build-811826-147589/root/chroot_tmpdir/scmroot/ocaml-calendar'...
$ git fetch origin 5a90b4e881b7dd357bb39c9385ad9c0a30e0b6f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-calendar
 * [new ref]         5a90b4e881b7dd357bb39c9385ad9c0a30e0b6f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a90b4e Revert "Remove BR ocaml-re, apparently not necessary."