$ git clone -n https://src.fedoraproject.org/rpms/ocaml-yojson.git /var/lib/mock/f41-build-side-1-3055178-38325/root/chroot_tmpdir/scmroot/ocaml-yojson
Cloning into '/var/lib/mock/f41-build-side-1-3055178-38325/root/chroot_tmpdir/scmroot/ocaml-yojson'...
$ git fetch origin eeafd6e91da778a49ce45d2e98bf64d61784323e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-yojson
 * [new ref]         eeafd6e91da778a49ce45d2e98bf64d61784323e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eeafd6e Version 2.2.2