$ git clone -n https://src.fedoraproject.org/rpms/alex4.git /var/lib/mock/f41-build-1026849-18267/root/chroot_tmpdir/scmroot/alex4
Cloning into '/var/lib/mock/f41-build-1026849-18267/root/chroot_tmpdir/scmroot/alex4'...
$ git fetch origin cb9a31ed9e4058d76163b144d1a2eb41b39b2658:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alex4
 * [new ref]         cb9a31ed9e4058d76163b144d1a2eb41b39b2658 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb9a31e convert GPL+ license to SPDX