$ git clone -n https://src.fedoraproject.org/rpms/ocaml-gen.git /var/lib/mock/f38-build-side-42-init-devel-734027-27628/root/chroot_tmpdir/scmroot/ocaml-gen
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-734027-27628/root/chroot_tmpdir/scmroot/ocaml-gen'...
$ git fetch origin 2d49b37c7c4b6483165e41734af7d7ffd72e8d8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-gen
 * [new ref]         2d49b37c7c4b6483165e41734af7d7ffd72e8d8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d49b37 Bump release and rebuild