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[3.15] gh-157265: tarfile: Honor None result of filter for link fallbacks (GH-157266) - #157309

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[3.15] gh-157265: tarfile: Honor None result of filter for link fallbacks (GH-157266)#157309
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@miss-islington miss-islington commented Sep 11, 2026

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(cherry picked from commit fb2f0bb)

Co-authored-by: Petr Viktorin encukou@gmail.com
Co-authored-by: Stan Ulbrych stan@python.org

…cks (pythonGH-157266)

(cherry picked from commit fb2f0bb)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Stan Ulbrych <stan@python.org>
pythongh-157266: Adjust test for Windows

On Windows (no symlinks, no hardlinks), the behaviour is
the same as without the fix in pythonGH-157266:
- a/t/dummy is extracted
- b/ is extracted
- c/ is *not* created (the target, a/t, is not in the archive)
- c/escape: c/ is created; escape is skipped (target,
   c/../../link_here, is not in archive)
- c is not recreated as a directory
- boom is not created (target is c/escape, which falls back to
  ..\..\link_here, which does not exist in archive)
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