$ git clone -n https://src.fedoraproject.org/rpms/ocaml-bos.git /var/lib/mock/f41-build-851795-166073/root/chroot_tmpdir/scmroot/ocaml-bos
Cloning into '/var/lib/mock/f41-build-851795-166073/root/chroot_tmpdir/scmroot/ocaml-bos'...
$ git fetch origin 1ae32b35fbdcc761535ec15ce0bbc82311d655e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-bos
 * [new ref]         1ae32b35fbdcc761535ec15ce0bbc82311d655e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ae32b3 Rebuild for ocaml-mtime 2.1.0