$ git clone -n https://src.fedoraproject.org/rpms/ocaml-yojson.git /var/lib/mock/f38-build-side-42-init-devel-686712-26759/root/chroot_tmpdir/scmroot/ocaml-yojson
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-686712-26759/root/chroot_tmpdir/scmroot/ocaml-yojson'...
$ git fetch origin db63679d7ba0f96f323b98443b43338192477aae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-yojson
 * [new ref]         db63679d7ba0f96f323b98443b43338192477aae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db63679 Rebuild OCaml packages for F38