#!/usr/bin/env bash
# Run ONCE, on the worker node only (beta — the old VPS). Joins the Swarm
# initialized by init-swarm.sh on the manager, over the WireGuard tunnel.
set -euo pipefail

MANAGER_WG_IP="${1:?usage: $0 <manager_wg_ip> <join_token>}"
JOIN_TOKEN="${2:?}"

if docker info 2>/dev/null | grep -q "Swarm: active"; then
  echo "This node is already part of a swarm:"
  docker info 2>/dev/null | grep -A2 "Swarm:"
  exit 0
fi

docker swarm join --token "$JOIN_TOKEN" "${MANAGER_WG_IP}:2377"

echo
echo "Joined. Verify from the manager: docker node ls"