PermissionError: [Errno 13] Permission denied: '/system_ext/bin'

## Issue

I'm trying to do some Python development on an Android phone.  I `pkg install python pipx`, I `pipx install tox`, and when I run `tox`, I get

```console
$ tox
Traceback (most recent call last):
  File "/data/data/com.termux/files/home/.local/bin/tox", line 8, in <module>
    sys.exit(run())
             ^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/run.py", line 20, in run
    result = main(sys.argv[1:] if args is None else args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/run.py", line 46, in main
    return handler(state)
           ^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/legacy.py", line 115, in legacy
    return run_sequential(state)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/run/sequential.py", line 25, in run_sequential
    return execute(state, max_workers=1, has_spinner=False, live=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/run/common.py", line 167, in execute
    state.envs.ensure_only_run_env_is_active()
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 436, in ensure_only_run_env_is_active
    envs, active = self._defined_envs, self._env_name_to_active()
                   ^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 291, in _defined_envs
    raise failed[next(iter(failed_to_create))]
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 268, in _defined_envs
    run_env.package_env = self._build_pkg_env(pkg_name_type, name, env_name_to_active)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 340, in _build_pkg_env
    name_type = next(child_package_envs)
                ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/package/pyproject.py", line 191, in register_run_env
    yield from super().register_run_env(run_env)
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/package.py", line 117, in register_run_env
    pkg_env = run_env.conf["wheel_build_env"]
              ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/sets.py", line 116, in __getitem__
    return self.load(item)
           ^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/sets.py", line 127, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/of_type.py", line 117, in __call__
    value = self.default(conf, args.env_name) if callable(self.default) else self.default
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/package.py", line 93, in default_wheel_tag
    run_py = cast(Python, run_env).base_python
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 282, in base_python
    self._base_python = self._get_python(base_pythons)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 139, in _get_python
    interpreter = self.creator.interpreter
                  ^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 131, in creator
    return self.session.creator
           ^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 112, in session
    self._virtualenv_session = session_via_cli(env_dir, options=None, setup_logging=False, env=env)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/run/__init__.py", line 49, in session_via_cli
    parser, elements = build_parser(args, options, setup_logging, env)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/run/__init__.py", line 77, in build_parser
    parser._interpreter = interpreter = discover.interpreter  # noqa: SLF001
                                        ^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/discover.py", line 41, in interpreter
    self._interpreter = self.run()
                        ^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 59, in run
    result = get_interpreter(python_spec, self.try_first_with, self.app_data, self._env)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 76, in get_interpreter
    for interpreter, impl_must_match in propose_interpreters(spec, try_first_with, app_data, env):
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 150, in propose_interpreters
    for exe, impl_must_match in find_candidates(path):
                                ^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 210, in path_exes
    for exe in path.iterdir():
               ^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.12/pathlib.py", line 1056, in iterdir
    for name in os.listdir(self):
                ^^^^^^^^^^^^^^^^
PermissionError: [Errno 13] Permission denied: '/system_ext/bin'
```

## Environment

Provide at least:

- OS: Android 14, Termux version "googleplay.2024.10.30".

<details open>
<summary>Output of <code>pip list</code> of the host Python, where <code>tox</code> is installed</summary>

```console
$ pipx runpip tox list
Package       Version
------------- -------
cachetools    5.5.0
chardet       5.2.0
colorama      0.4.6
distlib       0.3.9
filelock      3.16.1
packaging     24.1
pip           24.3.1
platformdirs  4.3.6
pluggy        1.5.0
pyproject-api 1.8.0
tox           4.23.2
virtualenv    20.27.1
```

</details>

## Output of running tox

<details open>
<summary>Output of <code>tox -rvv</code></summary>

```console
$ tox -rvv
.pkg: 571 I find interpreter for spec PythonSpec(path=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python) [virtualenv/discovery/builtin.py:73]
.pkg: 572 D filesystem is case-sensitive [virtualenv/info.py:25]
.pkg: 574 D got python info of %s from (PosixPath('/data/data/com.termux/files/usr/bin/python3.12'), PosixPath('/data/data/com.termux/files/home/.local/share/virtualenv/py_info/1/b79a9a5477d361435df197a745d21ec01f512605a327ac6a32dfd7a0672634c1.json')) [virtualenv/app_data/via_disk_folder.py:131]
.pkg: 575 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 575 D accepted PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:82]
.pkg: 667 I find interpreter for spec PythonSpec(path=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python) [virtualenv/discovery/builtin.py:73]
.pkg: 668 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 668 D accepted PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:82]
.pkg: 676 I find interpreter for spec PythonSpec(major=3, minor=12) [virtualenv/discovery/builtin.py:73]
.pkg: 676 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 676 D accepted PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:82]
.pkg: 683 I find interpreter for spec PythonSpec(major=3, minor=13) [virtualenv/discovery/builtin.py:73]
.pkg: 683 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 683 D discover PATH[0]=/data/data/com.termux/files/home/bin [virtualenv/discovery/builtin.py:149]
.pkg: 690 D get interpreter info via cmd: /data/data/com.termux/files/home/bin/python3.13 /data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/py_info.py N0OSS5OYVRURUGg3TsLDMtwMeT5bGHz6 7WPLU2nigNZNwTwi6kHraVb31Eb0tpeI [virtualenv/discovery/cached_py_info.py:112]
.pkg: 704 I failed to query /data/data/com.termux/files/home/bin/python3.13 with code 1 out: 'python3.13 not installed, try\n\n  rebuild-python --branch=3.13 --pull --clean\n' [virtualenv/discovery/cached_py_info.py:34]
.pkg: 704 D discover PATH[1]=/data/data/com.termux/files/home/bin/local [virtualenv/discovery/builtin.py:149]
.pkg: 704 D discover PATH[2]=/data/data/com.termux/files/home/.local/bin [virtualenv/discovery/builtin.py:149]
.pkg: 707 D discover PATH[3]=/data/data/com.termux/files/usr/bin [virtualenv/discovery/builtin.py:149]
.pkg: 712 D got python info of %s from (PosixPath('/data/data/com.termux/files/usr/bin/python3'), PosixPath('/data/data/com.termux/files/home/.local/share/virtualenv/py_info/1/dc9930c17e9cd9135e54e5b33ca6344ea5ed0954bc7fe787d0822891c3159b6d.json')) [virtualenv/app_data/via_disk_folder.py:131]
.pkg: 713 I proposed PathPythonInfo(spec=CPython3.12.7.final.0-64, exe=/data/data/com.termux/files/usr/bin/python3, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 714 D discover PATH[4]=/apex/com.android.runtime/bin [virtualenv/discovery/builtin.py:149]
.pkg: 715 D discover PATH[5]=/apex/com.android.art/bin [virtualenv/discovery/builtin.py:149]
.pkg: 715 D discover PATH[6]=/system_ext/bin [virtualenv/discovery/builtin.py:149]
.pkg: 725 I find interpreter for spec PythonSpec(path=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python) [virtualenv/discovery/builtin.py:73]
.pkg: 726 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 726 D accepted PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:82]
.pkg: 732 I find interpreter for spec PythonSpec(path=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python) [virtualenv/discovery/builtin.py:73]
.pkg: 733 I proposed PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:80]
.pkg: 733 D accepted PythonInfo(spec=CPython3.12.7.final.0-64, system=/data/data/com.termux/files/usr/bin/python3.12, exe=/data/data/com.termux/files/home/.local/pipx/venvs/tox/bin/python, platform=linux, version='3.12.7 (main, Oct 23 2024, 22:38:17) [Clang 18.0.2 (https://android.googlesource.com/toolchain/llvm-project d8003a456', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:82]
Traceback (most recent call last):
  File "/data/data/com.termux/files/home/.local/bin/tox", line 8, in <module>
    sys.exit(run())
             ^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/run.py", line 20, in run
    result = main(sys.argv[1:] if args is None else args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/run.py", line 46, in main
    return handler(state)
           ^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/legacy.py", line 115, in legacy
    return run_sequential(state)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/run/sequential.py", line 25, in run_sequential
    return execute(state, max_workers=1, has_spinner=False, live=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/cmd/run/common.py", line 167, in execute
    state.envs.ensure_only_run_env_is_active()
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 436, in ensure_only_run_env_is_active
    envs, active = self._defined_envs, self._env_name_to_active()
                   ^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 291, in _defined_envs
    raise failed[next(iter(failed_to_create))]
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 268, in _defined_envs
    run_env.package_env = self._build_pkg_env(pkg_name_type, name, env_name_to_active)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/session/env_select.py", line 340, in _build_pkg_env
    name_type = next(child_package_envs)
                ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/package/pyproject.py", line 191, in register_run_env
    yield from super().register_run_env(run_env)
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/package.py", line 117, in register_run_env
    pkg_env = run_env.conf["wheel_build_env"]
              ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/sets.py", line 116, in __getitem__
    return self.load(item)
           ^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/sets.py", line 127, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/config/of_type.py", line 117, in __call__
    value = self.default(conf, args.env_name) if callable(self.default) else self.default
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/package.py", line 93, in default_wheel_tag
    run_py = cast(Python, run_env).base_python
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 282, in base_python
    self._base_python = self._get_python(base_pythons)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 139, in _get_python
    interpreter = self.creator.interpreter
                  ^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 131, in creator
    return self.session.creator
           ^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/tox/tox_env/python/virtual_env/api.py", line 112, in session
    self._virtualenv_session = session_via_cli(env_dir, options=None, setup_logging=False, env=env)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/run/__init__.py", line 49, in session_via_cli
    parser, elements = build_parser(args, options, setup_logging, env)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/run/__init__.py", line 77, in build_parser
    parser._interpreter = interpreter = discover.interpreter  # noqa: SLF001
                                        ^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/discover.py", line 41, in interpreter
    self._interpreter = self.run()
                        ^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 59, in run
    result = get_interpreter(python_spec, self.try_first_with, self.app_data, self._env)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 76, in get_interpreter
    for interpreter, impl_must_match in propose_interpreters(spec, try_first_with, app_data, env):
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 150, in propose_interpreters
    for exe, impl_must_match in find_candidates(path):
                                ^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/.local/pipx/venvs/tox/lib/python3.12/site-packages/virtualenv/discovery/builtin.py", line 210, in path_exes
    for exe in path.iterdir():
               ^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.12/pathlib.py", line 1056, in iterdir
    for name in os.listdir(self):
                ^^^^^^^^^^^^^^^^
PermissionError: [Errno 13] Permission denied: '/system_ext/bin'
```

</details>

## Minimal example



```console
$ tox
```

## Additional information

My $PATH is

```console
$ echo $PATH | tr : '\n'
/data/data/com.termux/files/home/bin
/data/data/com.termux/files/home/bin/local
/data/data/com.termux/files/home/.local/bin
/usr/games
/usr/local/sbin
/usr/local/bin
/usr/sbin
/sbin
/data/data/com.termux/files/usr/bin
/product/bin
/apex/com.android.runtime/bin
/apex/com.android.art/bin
/system_ext/bin
/system/bin
/system/xbin
/odm/bin
/vendor/bin
/vendor/xbin
```

```console
$ ls -ld /system_ext/bin
drwxr-x--x. 3 root shell 4096 Jan  1  2009 /system_ext/bin
```

I have no idea why Termux puts an inaccessible directory on the default PATH, but it would be helpful if Tox's interpreter discovery would skip it instead of failing entirely.

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PermissionError: [Errno 13] Permission denied: '/system_ext/bin' #3436

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Uh oh!

PermissionError: [Errno 13] Permission denied: '/system_ext/bin' #3436

Description

Issue

Environment

Output of running tox

Minimal example

Additional information

Metadata

Metadata

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Type

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Development

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