openenv/echo_env

1# SPDX-License-Identifier: BSD-3-Clause2 3"""Shared helpers for reading environment server configuration."""4 5from __future__ import annotations6 7import json8import re9 10import yaml11 12 13def parse_openenv_app_field(yaml_content: str) -> str | None:14    """Extract the top-level ``app`` value from raw ``openenv.yaml`` content."""15    try:16        data = yaml.safe_load(yaml_content) or {}17    except Exception:18        return None19 20    if not isinstance(data, dict):21        return None22 23    value = data.get("app")24    if isinstance(value, str):25        value = value.strip()26        return value if value else None27    return None28 29 30def parse_dockerfile_cmd(dockerfile_content: str) -> str | None:31    """Extract the server command from the last Dockerfile ``CMD``."""32    last_cmd: str | None = None33    for line in dockerfile_content.splitlines():34        stripped = line.strip()35        if stripped.startswith("#"):36            continue37        match = re.match(r"CMD\s+(.+)", stripped, flags=re.IGNORECASE)38        if match:39            last_cmd = match.group(1).strip()40 41    if last_cmd is None:42        return None43 44    if last_cmd.startswith("["):45        try:46            parts = json.loads(last_cmd)47            if isinstance(parts, list) and all(isinstance(p, str) for p in parts):48                return " ".join(parts)49        except (json.JSONDecodeError, TypeError):50            # Invalid exec-form JSON falls back to the raw CMD below.51            pass52 53    return last_cmd if last_cmd else None54