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kevinveenbirkenbachandClaude Opus 4.8
a097bf36c5
write_dotenv truncated .env in place, so a concurrent make dotenv (parallel make test regenerates the shared file once per target) could expose a torn half-written file to a sibling reader. Write a per-pid sibling temp with the normal umask-respecting mode, then atomically rename it over .env. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
"""Serialise an EnvBuilder to .env on disk.
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The output format is the docker-compose `.env`-subset that is also
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sourceable from bash (via `set -a; source .env; set +a`). Values that
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contain only "safe" characters are emitted bare; everything else is
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double-quoted with backslash-escaping of `\\` and `"`.
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Each key is preceded by its documentation comment when the builder
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carries one, mirroring the convention used in `default.env`.
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"""
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from __future__ import annotations
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import os
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import re
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from pathlib import Path
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from utils.env.builder import EnvBuilder
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_SAFE_VALUE_RE = re.compile(r"^[A-Za-z0-9_/.@:%+=-]+$")
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def quote_for_dotenv(value: str) -> str:
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if value != "" and _SAFE_VALUE_RE.match(value):
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return value
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if "\n" in value or "\r" in value:
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raise ValueError(
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"Multi-line env values cannot be written to .env "
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"(bash `source` and docker-compose `--env-file` both fail "
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"to round-trip them). Collapse to a single line at the "
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f"producer. Offending value: {value!r}"
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)
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escaped = value.replace("\\", "\\\\").replace('"', '\\"')
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return f'"{escaped}"'
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def write_dotenv(eb: EnvBuilder, dest: Path) -> None:
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lines: list[str] = [
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"# Generated by `make dotenv` (python -m cli.meta.env) -- do NOT edit.",
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"# Re-run after changes to default.env or after the runtime context",
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"# shifts (distro, CI vs local, fresh checkout).",
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]
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for key in sorted(eb.values):
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lines.append("")
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comment = eb.comments.get(key, "").strip()
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if comment:
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lines.append(f"# {comment}")
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lines.append(f"{key}={quote_for_dotenv(eb.values[key])}")
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tmp = dest.with_name(f"{dest.name}.{os.getpid()}.tmp")
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try:
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tmp.write_text("\n".join(lines) + "\n", encoding="utf-8")
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tmp.replace(dest)
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except BaseException:
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tmp.unlink(missing_ok=True)
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raise
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