$ git clone -n https://src.fedoraproject.org/rpms/grub2.git /var/lib/mock/f45-build-13070-446/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/f45-build-13070-446/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 7dd6677a65e8cad55ec8f79231078084d09df9d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grub2
 * [new ref]           7dd6677a65e8cad55ec8f79231078084d09df9d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7dd6677a Use large code model on riscv64