$ git clone -n https://src.fedoraproject.org/rpms/frr.git /var/lib/mock/f39-build-1682068-41045/root/chroot_tmpdir/scmroot/frr
Cloning into '/var/lib/mock/f39-build-1682068-41045/root/chroot_tmpdir/scmroot/frr'...
$ git fetch origin 3c846ec9752c41d4158f07dec8d6233cf65aefac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frr
 * [new ref]         3c846ec9752c41d4158f07dec8d6233cf65aefac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c846ec New version 8.5.3