$ git clone -n https://src.fedoraproject.org/rpms/xfce4-panel.git /var/lib/mock/f41-build-side-1-2810785-32921/root/chroot_tmpdir/scmroot/xfce4-panel
Cloning into '/var/lib/mock/f41-build-side-1-2810785-32921/root/chroot_tmpdir/scmroot/xfce4-panel'...
$ git fetch origin fde38d89ba1369ad53f53bf5a509d75b67d0046b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-panel
 * [new ref]         fde38d89ba1369ad53f53bf5a509d75b67d0046b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fde38d8 convert license to SPDX