Use pax instead of GNU headers for tar - #3203
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maturin has been using GNU headers for tar, while the spec wants pax headers (pypa/packaging.python.org#2058). This PR switches maturin over to pax headers. Using a constraint tar/zip format is important to avoid parser differentials.
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Pull request overview
This PR updates sdist tar generation to avoid GNU headers and emit pax-compatible tar entries for paths that exceed ustar limits or require UTF-8 pax path metadata.
Changes:
- Switches sdist entry headers from GNU to ustar.
- Adds manual pax extended header generation for archive paths that cannot be represented directly in ustar.
- Adds a regression test inspecting raw tar blocks for pax path handling.
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messense
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May 28, 2026
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## 1.14.1 * Bump uraimo/run-on-arch-action to v3 to fix pytest job ([#3221](PyO3/maturin#3221)) * Fix platform tag logic to generate the same as cpython on AIX ([#3220](PyO3/maturin#3220)) * Bump pyo3-introspection ([#3227](PyO3/maturin#3227)) * Upgrade cargo-zigbuild & cargo-xwin ([#3228](PyO3/maturin#3228)) * Fix issues around crates enabling abi3 and abi3t features ([#3226](PyO3/maturin#3226)) * Add PEP 740 publish attestations to PyPI releases ([#3230](PyO3/maturin#3230)) * Set PYO3_PYTHON to run scripts for stable ABI builds ([#3233](PyO3/maturin#3233)) * Fix shell quoting in CI scripts ([#3231](PyO3/maturin#3231)) ## 1.14.0 * Support parent-relative pyproject metadata in sdists ([#3182](PyO3/maturin#3182)) * Update PyPI platform tag validation ([#3187](PyO3/maturin#3187)) * Maint: update setup emsdk action in generate-ci ([#3194](PyO3/maturin#3194)) * Fix: only shim bin wheels during auditwheel repair ([#3197](PyO3/maturin#3197)) * Fix: avoid editable ELF truncation from stale hardlinks ([#3199](PyO3/maturin#3199)) * Fix Pyodide Emscripten platform tags ([#3191](PyO3/maturin#3191)) * Use pax instead of GNU headers for tar ([#3203](PyO3/maturin#3203)) * Feat: add default exclude `__pycache__` and `*.pyc` files ([#3202](PyO3/maturin#3202)) * Add support for finding free-threaded interpreters for `--find-interpreters` ([#3206](PyO3/maturin#3206)) * Stubs: also generate them for mixed PyO3 projects ([#3211](PyO3/maturin#3211)) * Don't depend on CFFI on PyPy ([#3213](PyO3/maturin#3213)) * Support pyo3 abi3t features on Python3.15 and PyO3 0.29 ([#3113](PyO3/maturin#3113))
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maturin has been using GNU headers for tar, while the spec wants pax headers (pypa/packaging.python.org#2058). This PR switches maturin over to pax headers.
Using a constraint tar/zip format is important to avoid parser differentials.
Fixes #3195