$ git clone -n https://src.fedoraproject.org/rpms/qt5.git /var/lib/mock/f41-build-847155-163772/root/chroot_tmpdir/scmroot/qt5
Cloning into '/var/lib/mock/f41-build-847155-163772/root/chroot_tmpdir/scmroot/qt5'...
$ git fetch origin 20826ccf186f83135a0cad5df70f9bafd0f5ae3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5
 * [new ref]         20826ccf186f83135a0cad5df70f9bafd0f5ae3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20826cc 5.15.15