$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-here.git /var/lib/mock/f40-build-784008-133236/root/chroot_tmpdir/scmroot/ocaml-ppx-here
Cloning into '/var/lib/mock/f40-build-784008-133236/root/chroot_tmpdir/scmroot/ocaml-ppx-here'...
$ git fetch origin c80023f71890b66ef061a687652e38b3b37d64c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-here
 * [new ref]         c80023f71890b66ef061a687652e38b3b37d64c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c80023f Bump and rebuild