81c2145c8d
Offset the FILE_LINES growth the moa preset fixes add to hermes_cli/config.py (4283 > its 4274 cap): the version-stamp trio (raw read of _config_version plus check_config_version) moves verbatim into topical sibling hermes_cli/config_version_stamp.py; config.py re-exports the two public names (callers and tests import them from hermes_cli.config), the internal _read_config_version_stamp callers now use read_config_version_stamp, and scripts/docker_config_migrate.py imports from the new module directly.
110 lines
3.8 KiB
Python
110 lines
3.8 KiB
Python
#!/usr/bin/env python3
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"""Run Docker boot-time config migrations safely."""
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from __future__ import annotations
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import shutil
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import sys
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from pathlib import Path
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from typing import Iterable
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from hermes_cli.config import (
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InvalidUserConfigError,
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get_config_path,
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get_env_path,
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migrate_config,
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)
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from hermes_cli.config_version_stamp import check_config_version, read_config_version_stamp
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from hermes_cli.config_backups import backup_config, list_config_backups
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from hermes_cli.config_migrations import (
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SUPPORT_FLOOR_VERSION,
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support_floor_message,
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)
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from utils import env_var_enabled
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def _backup_existing(paths: Iterable[Path]) -> dict[Path, Path]:
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"""Snapshot each file into backups/config/; an identical existing snapshot is reused."""
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backups: dict[Path, Path] = {}
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for path in paths:
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dest = backup_config(path, "pre-docker-migrate") or next(
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iter(list_config_backups(path, "pre-docker-migrate")), None)
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if dest is not None:
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backups[path] = dest
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return backups
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def _restore_backups(backups: dict[Path, Path]) -> list[Path]:
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restored: list[Path] = []
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for original, backup in backups.items():
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if not backup.is_file():
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continue
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shutil.copy2(backup, original)
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restored.append(original)
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return restored
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def main() -> int:
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if env_var_enabled("HERMES_SKIP_CONFIG_MIGRATION"):
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print("[config-migrate] HERMES_SKIP_CONFIG_MIGRATION is set; skipping config migration")
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return 0
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# Strict read: malformed YAML or a non-mapping root is left alone with a warning and the
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# boot continues, instead of running the backup/migrate dance that migrate_config() would
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# refuse anyway.
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try:
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stamp, latest_ver = read_config_version_stamp(raise_on_parse_error=True)
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except InvalidUserConfigError as exc:
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print(f"[config-migrate] WARNING: {exc}; leaving config.yaml untouched", file=sys.stderr)
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return 0
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current_ver = 0 if stamp is None else stamp
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if current_ver >= latest_ver:
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return 0
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# Below the auto-migration support floor: migrate_config() refuses (and
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# leaves the file untouched), so don't run the backup/verify dance that
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# would raise "did not advance config version" and block the boot.
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# Warn-and-continue matches the CLI's fail-safe posture. A config with no
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# _config_version (stamp None: a volume seeded from the template) is not
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# below the floor: migrate_config() stamps it.
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if stamp is not None and current_ver < SUPPORT_FLOOR_VERSION:
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print(
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f"[config-migrate] WARNING: {support_floor_message()}",
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file=sys.stderr,
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)
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return 0
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backups = _backup_existing((get_config_path(), get_env_path()))
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backup_text = ", ".join(str(path) for path in backups.values()) if backups else "none"
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print(
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f"[config-migrate] Migrating config schema {current_ver} -> {latest_ver}; "
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f"backups: {backup_text}"
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)
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try:
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migrate_config(interactive=False, quiet=False)
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except Exception:
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restored = _restore_backups(backups)
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if restored:
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print(
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"[config-migrate] Migration failed; restored "
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+ ", ".join(str(path) for path in restored)
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)
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raise
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post_ver, _ = check_config_version()
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if post_ver < latest_ver:
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restored = _restore_backups(backups)
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restored_text = ", ".join(str(path) for path in restored) if restored else "none"
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raise RuntimeError(
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f"migration did not advance config version to {latest_ver} "
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f"(still {post_ver}); restored: {restored_text}"
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)
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return 0
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if __name__ == "__main__":
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try:
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raise SystemExit(main())
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except Exception as exc:
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print(f"[config-migrate] ERROR: {exc}", file=sys.stderr)
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raise SystemExit(1)
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