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Windows: cached venv initialization fails on dangling package symlinks

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Évaluation

Difficulté
3/5
Temps estimé
1-2 jours
Accessibilité débutants
45/100
Type d'issue
Bug
Clarté
Clairement spécifiée
Activité
Active
Stack technique
python
Domaine
build-system

Piste de recherche

The failure is in _create_venv in python/private/python_bootstrap_template.txt, at the os.makedirs(dirname(venv_abs_path), exist_ok=True) call (around line 657). The issue's reproduction script execs that template and simulates a dangling directory symlink followed by a new one; start there. Done when the script's final assertions pass on Windows, with the stale link replaced by the required directory.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

🐞 bug report

Affected Rule

py_binary: _create_venv in
python/private/python_bootstrap_template.txt.

Is this a regression?

Nope. Present since Windows site-packages venv support. (Great feature by the way - saved us with 'awesome' windows path length lmitations)

Description

On Windows, a persistent venv contains a dangling
Lib/site-packages/annotated_types directory symlink into obsolete runfiles (Got obsolete through a python version upgrade).
The next initialization fails at:

os.makedirs(dirname(venv_abs_path), exist_ok=True)

The executable exits before creating the runtime symlink. The Bazel build
succeeds. Expected: replace the dangling link with the required directory.

🔬 Minimal Reproduction

Run this from a rules_python checkout on Windows. It exercises
_create_venv with the blocking state;

import sys
import tempfile
from pathlib import Path

template = Path("python/private/python_bootstrap_template.txt")
source = template.read_text(encoding="utf-8")
for placeholder, value in [
    ("%shebang%", "#!/usr/bin/env python3"),
    ("%stage2_bootstrap%", "unused.py"),
    ("%runtime_venv_symlinks%", ""),
]:
    source = source.replace(placeholder, value)
bootstrap = {"__name__": "bootstrap_repro"}
saved_path = sys.path[:]
try:
    exec(compile(source, str(template), "exec"), bootstrap)
finally:
    sys.path[:] = saved_path

with tempfile.TemporaryDirectory() as temp:
    root = Path(temp)
    runfiles = root / "runfiles"
    old = runfiles / "old/annotated_types"
    old.mkdir(parents=True)
    (old / "__init__.py").touch()
    bootstrap.update(
        EXTRACT_ROOT=str(root / "cache"),
        PYTHON_BINARY="_main/_process.venv/Scripts/python.exe",
        PYTHON_BINARY_ACTUAL=sys.executable,
        RESOLVE_PYTHON_BINARY_AT_RUNTIME=False,
        RUNTIME_VENV_SYMLINKS={
            "Lib/site-packages/annotated_types": "old/annotated_types",
        },
    )
    bootstrap["_create_venv"](str(runfiles), [])
    old.rename(root / "retired-package")
    new = runfiles / "new/annotated_types"
    new.mkdir(parents=True)
    (new / "__init__.py").touch()
    bootstrap["RUNTIME_VENV_SYMLINKS"] = {
        "Lib/site-packages/annotated_types/__init__.py":
            "new/annotated_types/__init__.py",
    }
    bootstrap["_create_venv"](str(runfiles), [])
    package = root / "cache/_main/_process.venv/Lib/site-packages/annotated_types"
    assert not package.is_symlink()
    assert (package / "__init__.py").is_symlink()
    print("Cached regular package recovered successfully")

🔥 Exception or Error


  File ".../python_bootstrap...", line 909, in main
    python_program = _create_venv(runfiles_root, delete_dirs)
  File ".../python_bootstrap...", line 657, in _create_venv
    os.makedirs(dirname(venv_abs_path), exist_ok=True)
  File "<frozen os>", line 228, in makedirs
FileExistsError: [WinError 183]
  ...\_process.venv\Lib\site-packages\annotated_types

🌍 Your Environment

Operating System: Windows 11 x86_64 (10.0.26200).

Output of bazel version:

Build label: 9.1.1

Rules_python version: c9c1794dab34cc50260cab4a7ddf96f023cff575

Anything else relevant? CPython 3.12.7; Windows symlinks enabled;
persistent RULES_PYTHON_EXTRACT_ROOT.

Langage dominant
Starlark
Étoiles
687
Forks
726
Merge moyen
1 j 7 h
PR mergées (30 j)
80

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