Bug report

Bug description:

I would expect both files A and B to be stored in the tar file. However, only A is archived.

# creating the test directory
!rm -rf test1.tar test1
!mkdir test1
!echo thisisa >test1/A
!echo thisisb >test1/B

import tarfile
archive = tarfile.open("test1.tar", mode="w", format=tarfile.GNU_FORMAT)
archive.addfile(archive.gettarinfo(name="test1/A"))
archive.addfile(archive.gettarinfo(name="test1/B"))
archive.close()
print(tarfile.open("test1.tar", mode="r").getnames())

Expected output:

['test1/A', 'test1/B']

Returned output:

['test1/A']

Reproduced on these Python versions:

Python 3.11.6 (main, Nov 28 2023, 09:22:32) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Python 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0] on linux

CPython versions tested on:

3.11

Operating systems tested on:

macOS

Linked PRs

• gh-116931: Add fileobj parameter check for Tarfile.addfile #117988