$ git clone -n https://src.fedoraproject.org/rpms/kf6-kxmlgui.git /var/lib/mock/f41-build-side-1-2820442-33164/root/chroot_tmpdir/scmroot/kf6-kxmlgui
Cloning into '/var/lib/mock/f41-build-side-1-2820442-33164/root/chroot_tmpdir/scmroot/kf6-kxmlgui'...
$ git fetch origin 4903a9a19e0ef5d4a204195961c2174096321f91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kxmlgui
 * [new ref]         4903a9a19e0ef5d4a204195961c2174096321f91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4903a9a 6.6.0