#!/bin/sh
# Runs on a1/a2/a3 before FRR starts:
#  - creates the dummy0 anycast interface (zebra only configures IPs on
#    interfaces that already exist, it doesn't create them)
#  - starts a tiny HTTP responder bound to the anycast IP, returning this
#    node's hostname, so traffic-test.sh can show which A-node answered
set -e

ip link add dummy0 type dummy
ip link set dummy0 up

mkdir -p /anycast-web
hostname > /anycast-web/index.html

(
  # wait until zebra (per frr.conf) assigns 10.200.200.1 to dummy0
  while ! ip -4 addr show dummy0 | grep -q 10.200.200.1; do
    sleep 1
  done
  exec python3 -m http.server 80 --bind 10.200.200.1 --directory /anycast-web
) &

exec /usr/lib/frr/docker-start