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bpo-39688: tarfile: compute next header offset using pax size for sparse file#18562

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nitmir wants to merge 2 commits into
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nitmir:fix-issue-39688
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bpo-39688: tarfile: compute next header offset using pax size for sparse file#18562
nitmir wants to merge 2 commits into
python:mainfrom
nitmir:fix-issue-39688

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@nitmir

@nitmir nitmir commented Feb 19, 2020

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In case of a sparse file, the tarinfo.size attribute is set to the sparse
file expanded size (pax attribute GNU.sparse.size or GNU.sparse.size) and
do not correspond to the actual size of the data block. The size of the
data block is specified by the size pax header if present or by the ustar
size header.
Moreover, for GNU sparse 1.0 files, the data block start at the beginning of
the sparse mapping and not after the sparse mapping and so the offset should
be computed from here.

https://bugs.python.org/issue39688

…rse file

In case of a sparse file, the tarinfo.size attribute is set to the sparse
file expanded size (pax attribute GNU.sparse.size or GNU.sparse.size) and
do not correspond to the actual size of the data block. The size of the
data block is specified by the size pax header if present or by the ustar
size header.
Moreover, for GNU sparse 1.0 files, the data block start at the beginning of
the sparse mapping and not after the sparse mapping and so the offset should
be computed from here.
@the-knights-who-say-ni

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github-actions Bot commented Apr 7, 2026

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This PR is stale because it has been open for 30 days with no activity.

@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Apr 7, 2026
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4 participants