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flatc is missing from the PyPy aarch64 wheel and from every install built from the sdist

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
52/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
cmake, docker, python
领域
build-system, testing-qa

调研方向

Read hatch_build.py and the [tool.hatch.build.targets.sdist] section of pyproject.toml, then inspect docker/Dockerfile.pypy-{bookworm,trixie}-manylinux-arm64 and the wheel build workflow. First confirm the reported missing-CMake warning in the PyPy ARM64 build log. Done when sdist-based installs and the PyPy ARM64 wheel include autobahn/_flatc/bin/flatc, and CI rejects a wheel missing it.

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描述

bug CI-CD

Problem

autobahn bundles the FlatBuffers compiler as autobahn/_flatc/bin/flatc, and
autobahn._flatc.get_flatc_path() returns it. Two kinds of installs have no flatc:

  1. The PyPy Linux aarch64 wheel. In 26.10.1, 31 of the 32 wheels contain flatc
    (3.4-4.4 MB). autobahn-26.10.1-pp311-pypy311_pp73-manylinux2014_aarch64.manylinux_2_17_aarch64.whl
    contains only autobahn/_flatc/__init__.py, which is why it is 669 KB, where the other wheels are 2.0-3.4 MB.
    26.7.1 has the same gap (656 KB, no flatc).

  2. Every install built from the sdist, i.e. every platform or interpreter without a
    matching wheel. The sdist excludes /deps/flatbuffers (pyproject.toml,
    [tool.hatch.build.targets.sdist], since #1797), so hatch_build.py _build_flatc()
    prints WARNING: .../deps/flatbuffers not found and returns without building it.
    Example: PyPy 8 (pp80), for which no wheel is published:

    $ uv venv -p pypy-3.11 v && uv pip install -p v/bin/python autobahn==26.10.1
$ v/bin/python -c 'from autobahn._flatc import get_flatc_path; get_flatc_path()'
FileNotFoundError: flatc binary not found at .../site-packages/autobahn/_flatc/bin/flatc.
This may indicate a corrupted installation. Try reinstalling: pip install --force-reinstall autobahn

    (the installed wheel is pp311-pypy311_pp80-linux_x86_64, built locally from the sdist).

Both failures are silent at build time: _build_flatc() only prints a warning, and the
release fileset check counts wheels, not their contents.

Likely causes

  • PyPy aarch64: _build_flatc() skips the build when cmake is not on PATH
    (WARNING: cmake not found, skipping flatc build). The custom PyPy ARM64 images
    (docker/Dockerfile.pypy-{bookworm,trixie}-manylinux-arm64) do not install cmake; the
    build log of the wheels-arm64 PyPy job should show the warning. Not yet confirmed from the log.
  • sdist: zlmdb keeps the FlatBuffers C++ sources needed for flatc in its sdist and only
    excludes tests/, samples/, docs/ and the other language bindings from
    /deps/flatbuffers; autobahn excludes the whole directory.

Proposal

  1. Install cmake in the PyPy ARM64 images (or in build-arm64-wheel.sh).
  2. Include the parts of deps/flatbuffers that flatc needs in the sdist, as zlmdb does.
  3. Make a missing flatc fail the wheel build in CI (e.g. an AUTOBAHN_REQUIRE_FLATC
    switch, or a check of every wheel's contents in the release workflow), so a wheel
    without flatc cannot be published again.

This issue was drafted with AI assistance (Claude Code).

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