$ git clone -n https://src.fedoraproject.org/rpms/qt.git /var/lib/mock/f45-build-34004-676/root/chroot_tmpdir/scmroot/qt
Cloning into '/var/lib/mock/f45-build-34004-676/root/chroot_tmpdir/scmroot/qt'...
$ git fetch origin cf51c4e6cf02c6dea0d55c03889ad8b69024f7bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt
 * [new ref]         cf51c4e6cf02c6dea0d55c03889ad8b69024f7bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf51c4e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild