$ git clone -n https://src.fedoraproject.org/rpms/ocaml-merlin.git /var/lib/mock/f41-build-856810-167776/root/chroot_tmpdir/scmroot/ocaml-merlin
Cloning into '/var/lib/mock/f41-build-856810-167776/root/chroot_tmpdir/scmroot/ocaml-merlin'...
$ git fetch origin 59c02c5ab8b56be847870469a9692981078adfd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-merlin
 * [new ref]         59c02c5ab8b56be847870469a9692981078adfd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59c02c5 Version 5.2.1