#!/bin/sh
set -eu

CONF=/etc/nginx/conf.d/default.conf
# 集群内真实 Service：project57-svc:80（不是 project57-deploy:3000）
A_UPSTREAM="${A_UPSTREAM:-http://project57-svc.ns-project57.svc.cluster.local:80}"
A_UPSTREAM="${A_UPSTREAM%/}"
A_PUBLIC="${A_PUBLIC:-https://project57.website-build.org}"
A_PUBLIC="${A_PUBLIC%/}"

NS="$(awk '/^nameserver/{print $2; exit}' /etc/resolv.conf || true)"
if [ -z "${NS}" ]; then
  NS=kube-dns.kube-system.svc.cluster.local
fi

sed -i \
  -e "s|__RESOLVER__|${NS}|g" \
  -e "s|__A_UPSTREAM__|${A_UPSTREAM}|g" \
  -e "s|__A_PUBLIC__|${A_PUBLIC}|g" \
  "${CONF}"

echo "nginx upstream: ${A_UPSTREAM} (resolver ${NS}, public ${A_PUBLIC})"
nginx -t