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[3.15] gh-82907: Document mtime=0 for reproducible tarfile gzip output (GH-150269) #150271

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serhiy-storchaka merged 1 commit into from
May 22, 2026
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[3.15] gh-82907: Document mtime=0 for reproducible tarfile gzip output (GH-150269) #150271

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4 changes: 3 additions & 1 deletion Doc/library/tarfile.rst
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Expand Up @@ -144,7 +144,9 @@ Some facts and figures:

For modes ``'w:gz'`` and ``'w|gz'``, :func:`tarfile.open` accepts the
keyword argument *mtime* to create a gzip archive header with that mtime. By
default, the mtime is set to the time of creation of the archive.
default, the mtime is set to the time of creation of the archive. Use
*mtime* ``0`` to generate a compressed stream that does not depend on
creation time, for reproducible output.

For special purposes, there is a second format for *mode*:
``'filemode|[compression]'``. :func:`tarfile.open` will return a :class:`TarFile`
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