$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtmqtt.git /var/lib/mock/f41-build-808332-145789/root/chroot_tmpdir/scmroot/qt6-qtmqtt
Cloning into '/var/lib/mock/f41-build-808332-145789/root/chroot_tmpdir/scmroot/qt6-qtmqtt'...
$ git fetch origin a13ad4d2d1e406f6881e7cbc457cdfaf43fdff0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtmqtt
 * [new ref]         a13ad4d2d1e406f6881e7cbc457cdfaf43fdff0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a13ad4d 6.7.1