$ git clone -n https://src.fedoraproject.org/rpms/libxfce4util.git /var/lib/mock/f40-build-786038-134149/root/chroot_tmpdir/scmroot/libxfce4util
Cloning into '/var/lib/mock/f40-build-786038-134149/root/chroot_tmpdir/scmroot/libxfce4util'...
$ git fetch origin 4fc4c09369690e3b639be582ac106a6961d34858:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxfce4util
 * [new ref]         4fc4c09369690e3b639be582ac106a6961d34858 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fc4c09 Update libxfce4util to v4.18.2