$ git clone -n https://src.fedoraproject.org/rpms/kf6-kxmlgui.git /var/lib/mock/f42-build-863387-171674/root/chroot_tmpdir/scmroot/kf6-kxmlgui
Cloning into '/var/lib/mock/f42-build-863387-171674/root/chroot_tmpdir/scmroot/kf6-kxmlgui'...
$ git fetch origin 120bd66b697d679b4613d88335cf97b24befa788:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kxmlgui
 * [new ref]         120bd66b697d679b4613d88335cf97b24befa788 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 120bd66 Frameworks 6.9