$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtbase.git /var/lib/mock/f41-build-847159-163777/root/chroot_tmpdir/scmroot/qt5-qtbase
Cloning into '/var/lib/mock/f41-build-847159-163777/root/chroot_tmpdir/scmroot/qt5-qtbase'...
$ git fetch origin e72a0f042417d60a2778ec3c12c7676f9e2454f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtbase
 * [new ref]         e72a0f042417d60a2778ec3c12c7676f9e2454f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e72a0f0 5.15.15