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Title: gh-133998: Fix tarfile error on out-of-range mtime in streaming gzip mode by harjothkhara · Pull Request #151828 · python/cpython · GitHub

Open Graph Title: gh-133998: Fix tarfile error on out-of-range mtime in streaming gzip mode by harjothkhara · Pull Request #151828 · python/cpython

X Title: gh-133998: Fix tarfile error on out-of-range mtime in streaming gzip mode by harjothkhara · Pull Request #151828 · python/cpython

Description: A streaming gzip tarball ("w|gz") with an out-of-range mtime (negative, or a clock past 2106) raises struct.error instead of writing the file. gzip already clamps these to 0 (GH-134278); this does the same for tarfile's streaming path. The non-streaming w:gz path uses GzipFile, so it was already fine. Added tests for the boundary and bad-clock cases. AI-assisted; I reviewed it and can explain it. Issue: gh-133998

Open Graph Description: A streaming gzip tarball ("w|gz") with an out-of-range mtime (negative, or a clock past 2106) raises struct.error instead of writing the file. gzip already clamps these to 0 (GH-134278); ...

X Description: A streaming gzip tarball ("w|gz") with an out-of-range mtime (negative, or a clock past 2106) raises struct.error instead of writing the file. gzip already clamps these to 0 (GH-1...

Opengraph URL: https://github.com/python/cpython/pull/151828

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ede7ba3 gh-133998: Clamp out-of-range mtime in tarfile streaming gzip writes harjothkhara Jun 21, 2026 https://github.com/python/cpython/pull/151828/commits/ede7ba390d1833de8b9290f1a343ccf6c01d43e0
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