$ git clone -n https://src.fedoraproject.org/rpms/openfortivpn.git /var/lib/mock/f41-build-858907-168500/root/chroot_tmpdir/scmroot/openfortivpn
Cloning into '/var/lib/mock/f41-build-858907-168500/root/chroot_tmpdir/scmroot/openfortivpn'...
$ git fetch origin 160b1f138245130e0c542282b21a341f8a8deef5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openfortivpn
 * [new ref]         160b1f138245130e0c542282b21a341f8a8deef5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 160b1f1 Update to latest upstream version