$ git clone -n https://src.fedoraproject.org/rpms/libxfce4ui.git /var/lib/mock/f40-build-786025-134147/root/chroot_tmpdir/scmroot/libxfce4ui
Cloning into '/var/lib/mock/f40-build-786025-134147/root/chroot_tmpdir/scmroot/libxfce4ui'...
$ git fetch origin b4ea71b8797c83c293063b210972b5dc3dc4afca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxfce4ui
 * [new ref]         b4ea71b8797c83c293063b210972b5dc3dc4afca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4ea71b Update libxfce4ui to v4.18.5