$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtmqtt.git /var/lib/mock/f42-build-side-1-3537706-46560/root/chroot_tmpdir/scmroot/qt6-qtmqtt
Cloning into '/var/lib/mock/f42-build-side-1-3537706-46560/root/chroot_tmpdir/scmroot/qt6-qtmqtt'...
$ git fetch origin b82953e5496c4921be8f902539822a86fbe83408:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtmqtt
 * [new ref]         b82953e5496c4921be8f902539822a86fbe83408 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b82953e 6.9.1