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[3.11] gh-161705: Prevent shadowing stdlib in gzip/tarfile/zipfile CLI - #161728

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gh-161705: Prevent shadowing stdlib in gzip/tarfile/zipfile CLI (#161706)

Remove sys.path[0] in gzip, tarfile and zipfile command line interface to prevent shadowing standard library modules from extracted files.

  • Add sys._path0 variable.
  • pymain_sys_path_add_path0() sets sys._path0.
  • Add runpy._remove_sys_path0().
  • gzip, tarfile and zipfile main functions now call _remove_sys_path0() to prevent shadowing stdlib modules from extracted files.

Backport to 3.11: add test.support.make_clean_env() function and add Py_NewRef(Py_None) in sysmodule.c.

(cherry picked from commit e891a91)

(cherry picked from commit 8aa5d65)

…ile CLI (python#161706) (python#161719)

pythongh-161705: Prevent shadowing stdlib in gzip/tarfile/zipfile CLI (python#161706)

Remove sys.path[0] in gzip, tarfile and zipfile command line
interface to prevent shadowing standard library modules from
extracted files.

* Add sys._path0 variable.
* pymain_sys_path_add_path0() sets sys._path0.
* Add runpy._remove_sys_path0().
* gzip, tarfile and zipfile main functions now call
  _remove_sys_path0() to prevent shadowing stdlib modules from
  extracted files.

Backport to 3.11: add test.support.make_clean_env() function and add
Py_NewRef(Py_None) in sysmodule.c.

(cherry picked from commit e891a91)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
(cherry picked from commit 8aa5d65)
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