$ git clone -n https://src.fedoraproject.org/rpms/quodlibet.git /var/lib/mock/f41-build-1764180-24713/root/chroot_tmpdir/scmroot/quodlibet
Cloning into '/var/lib/mock/f41-build-1764180-24713/root/chroot_tmpdir/scmroot/quodlibet'...
$ git fetch origin b385f6d21e256ebcf280c0f53dd9b2782bbad0e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quodlibet
 * [new ref]         b385f6d21e256ebcf280c0f53dd9b2782bbad0e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b385f6d convert GPLv2+ license to SPDX