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gh-57684: Add -P cmdline option and PYTHONSAFEPATH env var (#31542)

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Add the -P command line option and the PYTHONSAFEPATH environment
variable to not prepend a potentially unsafe path to sys.path.

* Add sys.flags.safe_path flag.
* Add PyConfig.safe_path member.
* Programs/_bootstrap_python.c uses config.safe_path=0.
* Update subprocess._optim_args_from_interpreter_flags() to handle
  the -P command line option.
* Modules/getpath.py sets safe_path to 1 if a "._pth" file is
  present.
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Victor Stinner 2022-05-06 01:34:11 +02:00 • committed by GitHub
parent f6dd14c653
commit ada8b6d1b1
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46
Doc/c-api/init_config.rst
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@ -543,6 +543,25 @@ PyConfig
See also the :c:member:`~PyConfig.orig_argv` member.
.. c:member:: int safe_path
If equals to zero, ``Py_RunMain()`` prepends a potentially unsafe path to
:data:`sys.path` at startup:
* If :c:member:`argv[0] <PyConfig.argv>` is equal to ``L"-m"``
(``python -m module``), prepend the current working directory.
* If running a script (``python script.py``), prepend the script's
directory. If it's a symbolic link, resolve symbolic links.
* Otherwise (``python -c code`` and ``python``), prepend an empty string,
which means the current working directory.
Set to 1 by the :option:`-P` command line option and the
:envvar:`PYTHONSAFEPATH` environment variable.
Default: ``0`` in Python config, ``1`` in isolated config.
.. versionadded:: 3.11
.. c:member:: wchar_t* base_exec_prefix
:data:`sys.base_exec_prefix`.
@ -809,13 +828,14 @@ PyConfig
If greater than 0, enable isolated mode:
* :data:`sys.path` contains neither the script's directory (computed from
``argv[0]`` or the current directory) nor the user's site-packages
directory.
* Set :c:member:`~PyConfig.safe_path` to 1:
don't prepend a potentially unsafe path to :data:`sys.path` at Python
startup.
* Set :c:member:`~PyConfig.use_environment` to 0.
* Set :c:member:`~PyConfig.user_site_directory` to 0: don't add the user
site directory to :data:`sys.path`.
* Python REPL doesn't import :mod:`readline` nor enable default readline
configuration on interactive prompts.
* Set :c:member:`~PyConfig.use_environment` and
:c:member:`~PyConfig.user_site_directory` to 0.
Default: ``0`` in Python mode, ``1`` in isolated mode.
@ -1029,12 +1049,13 @@ PyConfig
.. c:member:: wchar_t* run_filename
Filename passed on the command line: trailing command line argument
without :option:`-c` or :option:`-m`.
without :option:`-c` or :option:`-m`. It is used by the
:c:func:`Py_RunMain` function.
For example, it is set to ``script.py`` by the ``python3 script.py arg``
command.
command line.
Used by :c:func:`Py_RunMain`.
See also the :c:member:`PyConfig.skip_source_first_line` option.
Default: ``NULL``.
@ -1419,9 +1440,16 @@ site-package directory to :data:`sys.path`.
The following configuration files are used by the path configuration:
* ``pyvenv.cfg``
* ``python._pth`` (Windows only)
* ``._pth`` file (ex: ``python._pth``)
* ``pybuilddir.txt`` (Unix only)
If a ``._pth`` file is present:
* Set :c:member:`~PyConfig.isolated` to 1.
* Set :c:member:`~PyConfig.use_environment` to 0.
* Set :c:member:`~PyConfig.site_import` to 0.
* Set :c:member:`~PyConfig.safe_path` to 1.
The ``__PYVENV_LAUNCHER__`` environment variable is used to set
:c:member:`PyConfig.base_executable`