#!/bin/sh
# Substitute environment variables in YAML config templates before starting the service.
# Usage: entrypoint.sh <binary> -f <config.yaml>
#
# The YAML file is treated as a template with ${VAR} placeholders.
# envsubst replaces them with actual environment variable values at container start time.

set -e

BINARY="$1"
shift

CONFIG_FILE=""
for arg in "$@"; do
    case "$prev" in
        -f) CONFIG_FILE="$arg" ;;
    esac
    prev="$arg"
done

if [ -n "$CONFIG_FILE" ] && [ -f "$CONFIG_FILE" ]; then
    # Replace ${VAR} placeholders with environment variable values
    envsubst < "$CONFIG_FILE" > "${CONFIG_FILE}.tmp"
    mv "${CONFIG_FILE}.tmp" "$CONFIG_FILE"
fi

exec "$BINARY" "$@"