$ git clone -n https://src.fedoraproject.org/rpms/xfce4-settings.git /var/lib/mock/f40-build-768707-125374/root/chroot_tmpdir/scmroot/xfce4-settings
Cloning into '/var/lib/mock/f40-build-768707-125374/root/chroot_tmpdir/scmroot/xfce4-settings'...
$ git fetch origin c68cf471c74879fe217b3f408ce7e5ab8d4ebca3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-settings
 * [new ref]         c68cf471c74879fe217b3f408ce7e5ab8d4ebca3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c68cf47 Update to v4.18.4