$ git clone -n https://src.fedoraproject.org/rpms/kf6-kxmlgui.git /var/lib/mock/f41-build-838992-159978/root/chroot_tmpdir/scmroot/kf6-kxmlgui
Cloning into '/var/lib/mock/f41-build-838992-159978/root/chroot_tmpdir/scmroot/kf6-kxmlgui'...
$ git fetch origin 4fe4e739ec39172af4a430c73d739d9b2108db33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kxmlgui
 * [new ref]         4fe4e739ec39172af4a430c73d739d9b2108db33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fe4e73 6.5.0