$ git clone -n https://src.fedoraproject.org/rpms/xfce4-panel.git /var/lib/mock/f40-build-798863-142036/root/chroot_tmpdir/scmroot/xfce4-panel
Cloning into '/var/lib/mock/f40-build-798863-142036/root/chroot_tmpdir/scmroot/xfce4-panel'...
$ git fetch origin 26486870a2be76e99d2d0ff4e6bd2eb789bed099:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-panel
 * [new ref]         26486870a2be76e99d2d0ff4e6bd2eb789bed099 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2648687 Update to 4.18.6