$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtx11extras.git /var/lib/mock/f39-build-1664696-40724/root/chroot_tmpdir/scmroot/qt5-qtx11extras
Cloning into '/var/lib/mock/f39-build-1664696-40724/root/chroot_tmpdir/scmroot/qt5-qtx11extras'...
$ git fetch origin 5543adcc5f27a0bef980e9c9fef067cc4107bcdd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtx11extras
 * [new ref]         5543adcc5f27a0bef980e9c9fef067cc4107bcdd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5543adc 5.15.11