#!/bin/bash
# Makes the host machine's Postgres reachable at the usual 127.0.0.1:5432 inside
# the container, so your database settings work the same in or out of Docker.
set -euo pipefail

# If something's already answering on 5432 (like a proxy from a previous launch),
# leave it be. We test the port with a built-in bash trick so we don't have to
# install extra tools just to check.
if (exec 3<>/dev/tcp/127.0.0.1/5432) 2>/dev/null; then
  exec 3>&-   # port answered — already running
else
  echo "[pg] proxying 127.0.0.1:5432 -> host.docker.internal:5432"
  socat TCP-LISTEN:5432,bind=127.0.0.1,fork,reuseaddr \
        TCP:host.docker.internal:5432 &
fi