$ git clone -n https://src.fedoraproject.org/rpms/ocaml-tyxml.git /var/lib/mock/f41-build-side-1-2943391-35356/root/chroot_tmpdir/scmroot/ocaml-tyxml
Cloning into '/var/lib/mock/f41-build-side-1-2943391-35356/root/chroot_tmpdir/scmroot/ocaml-tyxml'...
$ git fetch origin a2c20ba0bdcb181de34467d1c567df567085077d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-tyxml
 * [new ref]         a2c20ba0bdcb181de34467d1c567df567085077d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2c20ba Rebuild for ocaml-ppxlib 0.33.0