"""Git source sync for import_docs (phase 28). clone_or_pull(url, dest) clones ``url`` into ``dest`` with FULL history the first time, or — for an existing checkout — unshallows a shallow one first (``git fetch --unshallow``, the one-time self-heal) and then fast-forwards it with ``git pull --ff-only``. Auth: nothing special — an ``https://…`` URL uses the OS credential helper / prompts; a ``git@host:repo.git`` URL uses the machine's SSH key. No credentials are stored here; whatever the URL/SSH config supplies is used. This module is the only place the ``git`` CLI is invoked (A11: stdlib ``subprocess`` only, no new packages) — every git command goes through :func:`run_git`: the clone, the shallow probe, the one-time ``git fetch --unshallow``, and the ``git pull --ff-only`` in :func:`clone_or_pull`, the per-file last-commit-date walk in :func:`file_commit_dates` (phase 106), and the docs-push sequence in :mod:`app.core.docs_push` (phase 59). Per-file last-commit dates (phase 106 D2; phase 107 D11 supersedes phase 106 D10) — behavior verified against scratch and live repos 2026-09-13 / 2026-09-16: * every :func:`clone_or_pull` checkout is FULL history for EVERY transport (https/ssh/``file://``/local-path): a fresh clone carries no ``--depth`` (D11 — D10's ``--depth 1`` shallow URL clones are gone), and an existing shallow checkout (made pre-phase 107 — i.e. every deployed one, live + dev included) is probed with ``git rev-parse --is-shallow-repository`` and, while shallow, self-healed with the ONE-TIME ``git fetch --unshallow`` before the usual ``git pull --ff-only`` — no re-clone; * on a full-history checkout :func:`file_commit_dates` yields the TRUE per-file last-commit date for ALL git sources. The old shallow-clone behavior was the bug the owner reported 2026-09-16: in a shallow clone git reports the TIP commit as every existing file's last commit (the shallow boundary is each file's history root) → a uniform per-repo tip date (``container_bifrost`` shown as created on the repo tip, months off); after ``git fetch --unshallow`` on the live homelab checkout (438 commits visible) the walk returned the true dates — e.g. ``bifrost.md`` 2026-05-05, not the 2026-09-07 tip. """ from __future__ import annotations import logging import subprocess from datetime import datetime from pathlib import Path logger = logging.getLogger(__name__) __all__ = ["GitSyncError", "clone_or_pull", "file_commit_dates", "run_git"] class GitSyncError(RuntimeError): """A git clone/pull failed (or git is missing); carries git's stderr.""" def clone_or_pull(url: str, dest: Path | str) -> Path: """Clone ``url`` into ``dest`` (full history, first run) or fast-forward it. - dest without a ``.git`` (or absent) → ``git clone url dest`` (full history for every transport — phase 107 D11: no ``--depth``, so a URL-transport checkout carries the whole commit log, not just the tip). - dest with a ``.git`` → probe ``git rev-parse --is-shallow-repository``; while shallow, ``git fetch --unshallow`` (the ONE-TIME self-heal for checkouts made shallow pre-phase 107 — the next sync of a deployed checkout becomes full-history without a re-clone), then ``git pull --ff-only`` (refuses to merge unrelated histories — a broken checkout fails loudly rather than producing a dirty index). Returns the destination path. Raises :class:`GitSyncError` when git is missing or a git invocation exits non-zero (with git's stderr in the message, so the caller can name the failing repo + reason). D12 fail-loud: a failed probe/unshallow/pull propagates exactly like a clone failure — never a silent fallback to tip dates or mtimes (a continued shallow checkout would silently re-serve the uniform tip date, i.e. the bug D11 fixes). """ dest = Path(dest) if not dest.exists() or not (dest / ".git").exists(): dest.parent.mkdir(parents=True, exist_ok=True) run_git(["git", "clone", url, str(dest)], cwd=dest.parent) else: shallow = ( run_git(["git", "rev-parse", "--is-shallow-repository"], cwd=dest) .strip() == "true" ) if shallow: run_git(["git", "fetch", "--unshallow"], cwd=dest) run_git(["git", "pull", "--ff-only"], cwd=dest) return dest def _parse_commit_dates(output: str) -> dict[str, datetime]: """Parse ``git log --name-only --format=@@%cI`` output (newest first). A ``@@`` line starts a commit (``%cI`` is ISO-strict, so the date is always aware — parsed with ``datetime.fromisoformat``); the following non-empty, non-``@@`` lines are repo-relative paths. The FIRST sighting of a path wins (the walk is newest-first) — that is the file's last-commit date. Paths are split on whitespace (like name-only output), ``\\``-normalized to ``/``, and a leading ``/`` is stripped. Raises ``ValueError`` on a malformed commit date or a path line before any commit header (the caller fails soft). """ dates: dict[str, datetime] = {} commit: datetime | None = None for line in output.splitlines(): line = line.strip() if not line: continue if line.startswith("@@"): commit = datetime.fromisoformat(line[2:]) continue if commit is None: raise ValueError(f"path line before any commit header: {line!r}") for raw_path in line.split(): path = raw_path.replace("\\", "/").lstrip("/") if path: dates.setdefault(path, commit) return dates def file_commit_dates(dest: Path | str) -> dict[str, datetime]: """Per-file last-commit dates for one checkout (phase 106, D2). ONE ``git log --name-only --format=@@%cI`` walk through :func:`run_git` (the A11 single-invocation site, one git call per source per sync) → ``{repo-relative POSIX path: last-commit datetime}``, newest-first so the first sighting of a path wins. Every ``clone_or_pull`` checkout is FULL history (fresh: no ``--depth``; an existing shallow checkout is unshallowed on its next sync — phase 107 D11 supersedes phase 106 D10's shallow tip-date behavior) → TRUE per-file last-commit dates for ALL git sources, local AND URL (verified 2026-09-16 — see the module docstring). Fail-soft (pinned): a missing/non-directory checkout, a git failure (:class:`GitSyncError`), or ANY parse anomaly logs a warning and returns ``{}`` — the importer falls back to file mtimes; a date walk must never break a sync. """ dest = Path(dest) if not dest.is_dir(): logger.warning( "file_commit_dates: %s is not a directory — no git dates " "(the importer will fall back to file mtimes)", dest, ) return {} try: output = run_git(["git", "log", "--name-only", "--format=@@%cI"], cwd=dest) except GitSyncError as exc: logger.warning( "file_commit_dates: git log failed for %s: %s — the importer " "will fall back to file mtimes", dest, exc, ) return {} try: return _parse_commit_dates(output) except ValueError as exc: logger.warning( "file_commit_dates: unparseable git log output for %s (%s) — the " "importer will fall back to file mtimes", dest, exc, ) return {} def run_git(argv: list[str], cwd: Path) -> str: """Run one git command, capturing output; raise GitSyncError on failure. The single ``git`` invocation point for the whole app (A11). Every step of :func:`clone_or_pull` and of the docs-push sequence (:mod:`app.core.docs_push`, phase 59) goes through here, so error handling stays uniform: captured stdout on success, and :class:`GitSyncError` carrying git's stderr on a non-zero exit (or when the git binary is missing from PATH). """ try: proc = subprocess.run(argv, cwd=cwd, capture_output=True, text=True) except FileNotFoundError: raise GitSyncError("git was not found on PATH — install git and retry") from None if proc.returncode != 0: raise GitSyncError( f"git {' '.join(argv[1:])} failed (exit {proc.returncode}): " f"{proc.stderr.strip()}" ) return proc.stdout