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
approved these changes
May 28, 2026
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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