[3.10] bpo-45863: tarfile: don't zero out header fields unnecessarily (GH-29693) #31233
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…nGH-29693) Numeric fields of type float, notably mtime, can't be represented exactly in the ustar header, so the pax header is used. But it is helpful to set them to the nearest int (i.e. second rather than nanosecond precision mtimes) in the ustar header as well, for the benefit of unarchivers that don't understand the pax header. Add test for tarfile.TarInfo.create_pax_header to confirm correct behaviour. (cherry picked from commit bf2d44f) Co-authored-by: Joshua Root <jmr@macports.org>
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Numeric fields of type float, notably mtime, can't be represented
exactly in the ustar header, so the pax header is used. But it is
helpful to set them to the nearest int (i.e. second rather than
nanosecond precision mtimes) in the ustar header as well, for the
benefit of unarchivers that don't understand the pax header.
Add test for tarfile.TarInfo.create_pax_header to confirm correct
behaviour.
(cherry picked from commit bf2d44f)
Co-authored-by: Joshua Root jmr@macports.org
https://bugs.python.org/issue45863