$ git clone -n https://src.fedoraproject.org/rpms/bird.git /var/lib/mock/f38-build-710672-93556/root/chroot_tmpdir/scmroot/bird
Cloning into '/var/lib/mock/f38-build-710672-93556/root/chroot_tmpdir/scmroot/bird'...
$ git fetch origin 5b9c19d2bf8e0512d25fde22ad7ef90b7463fe17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bird
 * [new ref]         5b9c19d2bf8e0512d25fde22ad7ef90b7463fe17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b9c19d Upgrade to 2.13 (#2188938)