$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtx11extras.git /var/lib/mock/f40-build-2269690-54777/root/chroot_tmpdir/scmroot/qt5-qtx11extras
Cloning into '/var/lib/mock/f40-build-2269690-54777/root/chroot_tmpdir/scmroot/qt5-qtx11extras'...
$ git fetch origin 28c92f608e848e52e54dd0ec4d2a9a1da8b8640a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtx11extras
 * [new ref]         28c92f608e848e52e54dd0ec4d2a9a1da8b8640a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28c92f6 5.15.12