$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwindowsystem.git /var/lib/mock/f40-build-2433054-60684/root/chroot_tmpdir/scmroot/kf6-kwindowsystem
Cloning into '/var/lib/mock/f40-build-2433054-60684/root/chroot_tmpdir/scmroot/kf6-kwindowsystem'...
$ git fetch origin 4e2feb4c8840614b94fc1083774fd57792ecc1e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwindowsystem
 * [new ref]         4e2feb4c8840614b94fc1083774fd57792ecc1e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e2feb4 Rebuild (qt6)