$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwindowsystem.git /var/lib/mock/f41-build-860196-168834/root/chroot_tmpdir/scmroot/kf6-kwindowsystem
Cloning into '/var/lib/mock/f41-build-860196-168834/root/chroot_tmpdir/scmroot/kf6-kwindowsystem'...
$ git fetch origin 5f99091396cb320f46a9605abe7eb5004bcf128c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwindowsystem
 * [new ref]         5f99091396cb320f46a9605abe7eb5004bcf128c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f99091 6.7.0