#!/bin/sh
set -eu

: "${BACKUP_DIR:?Set BACKUP_DIR to the destination directory}"
: "${POSTGRES_DB:?Set POSTGRES_DB}"
: "${POSTGRES_USER:?Set POSTGRES_USER}"
: "${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}"

timestamp=$(date -u '+%Y%m%dT%H%M%SZ')
mkdir -p "$BACKUP_DIR"
output_path="$BACKUP_DIR/${POSTGRES_DB}-${timestamp}.dump"

docker compose -f compose.production.yaml exec -T \
  -e PGPASSWORD="$POSTGRES_PASSWORD" postgres \
  pg_dump -U "$POSTGRES_USER" -Fc "$POSTGRES_DB" > "$output_path"

printf '%s\n' "$output_path"