$ git clone -n https://src.fedoraproject.org/rpms/kf6-kxmlgui.git /var/lib/mock/f40-build-1761394-24706/root/chroot_tmpdir/scmroot/kf6-kxmlgui
Cloning into '/var/lib/mock/f40-build-1761394-24706/root/chroot_tmpdir/scmroot/kf6-kxmlgui'...
$ git fetch origin dff1e3a4f3a1850bef201776eea2fb4bf661b10f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kxmlgui
 * [new ref]         dff1e3a4f3a1850bef201776eea2fb4bf661b10f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dff1e3a Merge branch 'rawhide' into f40