--- a/lib/python3.8/site-packages/setuptools/sandbox.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,492 +0,0 @@
-import os
-import sys
-import tempfile
-import operator
-import functools
-import itertools
-import re
-import contextlib
-import pickle
-import textwrap
-
-from setuptools.extern import six
-from setuptools.extern.six.moves import builtins, map
-
-import pkg_resources.py31compat
-from distutils.errors import DistutilsError
-from pkg_resources import working_set
-
-if sys.platform.startswith('java'):
-    import org.python.modules.posix.PosixModule as _os
-else:
-    _os = sys.modules[os.name]
-try:
-    _file = file
-except NameError:
-    _file = None
-_open = open
-
-
-__all__ = [
-    "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
-]
-
-
-def _execfile(filename, globals, locals=None):
-    """
-    Python 3 implementation of execfile.
-    """
-    mode = 'rb'
-    with open(filename, mode) as stream:
-        script = stream.read()
-    if locals is None:
-        locals = globals
-    code = compile(script, filename, 'exec')
-    exec(code, globals, locals)
-
-
-@contextlib.contextmanager
-def save_argv(repl=None):
-    saved = sys.argv[:]
-    if repl is not None:
-        sys.argv[:] = repl
-    try:
-        yield saved
-    finally:
-        sys.argv[:] = saved
-
-
-@contextlib.contextmanager
-def save_path():
-    saved = sys.path[:]
-    try:
-        yield saved
-    finally:
-        sys.path[:] = saved
-
-
-@contextlib.contextmanager
-def override_temp(replacement):
-    """
-    Monkey-patch tempfile.tempdir with replacement, ensuring it exists
-    """
-    pkg_resources.py31compat.makedirs(replacement, exist_ok=True)
-
-    saved = tempfile.tempdir
-
-    tempfile.tempdir = replacement
-
-    try:
-        yield
-    finally:
-        tempfile.tempdir = saved
-
-
-@contextlib.contextmanager
-def pushd(target):
-    saved = os.getcwd()
-    os.chdir(target)
-    try:
-        yield saved
-    finally:
-        os.chdir(saved)
-
-
-class UnpickleableException(Exception):
-    """
-    An exception representing another Exception that could not be pickled.
-    """
-
-    @staticmethod
-    def dump(type, exc):
-        """
-        Always return a dumped (pickled) type and exc. If exc can't be pickled,
-        wrap it in UnpickleableException first.
-        """
-        try:
-            return pickle.dumps(type), pickle.dumps(exc)
-        except Exception:
-            # get UnpickleableException inside the sandbox
-            from setuptools.sandbox import UnpickleableException as cls
-            return cls.dump(cls, cls(repr(exc)))
-
-
-class ExceptionSaver:
-    """
-    A Context Manager that will save an exception, serialized, and restore it
-    later.
-    """
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, type, exc, tb):
-        if not exc:
-            return
-
-        # dump the exception
-        self._saved = UnpickleableException.dump(type, exc)
-        self._tb = tb
-
-        # suppress the exception
-        return True
-
-    def resume(self):
-        "restore and re-raise any exception"
-
-        if '_saved' not in vars(self):
-            return
-
-        type, exc = map(pickle.loads, self._saved)
-        six.reraise(type, exc, self._tb)
-
-
-@contextlib.contextmanager
-def save_modules():
-    """
-    Context in which imported modules are saved.
-
-    Translates exceptions internal to the context into the equivalent exception
-    outside the context.
-    """
-    saved = sys.modules.copy()
-    with ExceptionSaver() as saved_exc:
-        yield saved
-
-    sys.modules.update(saved)
-    # remove any modules imported since
-    del_modules = (
-        mod_name for mod_name in sys.modules
-        if mod_name not in saved
-        # exclude any encodings modules. See #285
-        and not mod_name.startswith('encodings.')
-    )
-    _clear_modules(del_modules)
-
-    saved_exc.resume()
-
-
-def _clear_modules(module_names):
-    for mod_name in list(module_names):
-        del sys.modules[mod_name]
-
-
-@contextlib.contextmanager
-def save_pkg_resources_state():
-    saved = pkg_resources.__getstate__()
-    try:
-        yield saved
-    finally:
-        pkg_resources.__setstate__(saved)
-
-
-@contextlib.contextmanager
-def setup_context(setup_dir):
-    temp_dir = os.path.join(setup_dir, 'temp')
-    with save_pkg_resources_state():
-        with save_modules():
-            hide_setuptools()
-            with save_path():
-                with save_argv():
-                    with override_temp(temp_dir):
-                        with pushd(setup_dir):
-                            # ensure setuptools commands are available
-                            __import__('setuptools')
-                            yield
-
-
-def _needs_hiding(mod_name):
-    """
-    >>> _needs_hiding('setuptools')
-    True
-    >>> _needs_hiding('pkg_resources')
-    True
-    >>> _needs_hiding('setuptools_plugin')
-    False
-    >>> _needs_hiding('setuptools.__init__')
-    True
-    >>> _needs_hiding('distutils')
-    True
-    >>> _needs_hiding('os')
-    False
-    >>> _needs_hiding('Cython')
-    True
-    """
-    pattern = re.compile(r'(setuptools|pkg_resources|distutils|Cython)(\.|$)')
-    return bool(pattern.match(mod_name))
-
-
-def hide_setuptools():
-    """
-    Remove references to setuptools' modules from sys.modules to allow the
-    invocation to import the most appropriate setuptools. This technique is
-    necessary to avoid issues such as #315 where setuptools upgrading itself
-    would fail to find a function declared in the metadata.
-    """
-    modules = filter(_needs_hiding, sys.modules)
-    _clear_modules(modules)
-
-
-def run_setup(setup_script, args):
-    """Run a distutils setup script, sandboxed in its directory"""
-    setup_dir = os.path.abspath(os.path.dirname(setup_script))
-    with setup_context(setup_dir):
-        try:
-            sys.argv[:] = [setup_script] + list(args)
-            sys.path.insert(0, setup_dir)
-            # reset to include setup dir, w/clean callback list
-            working_set.__init__()
-            working_set.callbacks.append(lambda dist: dist.activate())
-
-            # __file__ should be a byte string on Python 2 (#712)
-            dunder_file = (
-                setup_script
-                if isinstance(setup_script, str) else
-                setup_script.encode(sys.getfilesystemencoding())
-            )
-
-            with DirectorySandbox(setup_dir):
-                ns = dict(__file__=dunder_file, __name__='__main__')
-                _execfile(setup_script, ns)
-        except SystemExit as v:
-            if v.args and v.args[0]:
-                raise
-            # Normal exit, just return
-
-
-class AbstractSandbox:
-    """Wrap 'os' module and 'open()' builtin for virtualizing setup scripts"""
-
-    _active = False
-
-    def __init__(self):
-        self._attrs = [
-            name for name in dir(_os)
-            if not name.startswith('_') and hasattr(self, name)
-        ]
-
-    def _copy(self, source):
-        for name in self._attrs:
-            setattr(os, name, getattr(source, name))
-
-    def __enter__(self):
-        self._copy(self)
-        if _file:
-            builtins.file = self._file
-        builtins.open = self._open
-        self._active = True
-
-    def __exit__(self, exc_type, exc_value, traceback):
-        self._active = False
-        if _file:
-            builtins.file = _file
-        builtins.open = _open
-        self._copy(_os)
-
-    def run(self, func):
-        """Run 'func' under os sandboxing"""
-        with self:
-            return func()
-
-    def _mk_dual_path_wrapper(name):
-        original = getattr(_os, name)
-
-        def wrap(self, src, dst, *args, **kw):
-            if self._active:
-                src, dst = self._remap_pair(name, src, dst, *args, **kw)
-            return original(src, dst, *args, **kw)
-
-        return wrap
-
-    for name in ["rename", "link", "symlink"]:
-        if hasattr(_os, name):
-            locals()[name] = _mk_dual_path_wrapper(name)
-
-    def _mk_single_path_wrapper(name, original=None):
-        original = original or getattr(_os, name)
-
-        def wrap(self, path, *args, **kw):
-            if self._active:
-                path = self._remap_input(name, path, *args, **kw)
-            return original(path, *args, **kw)
-
-        return wrap
-
-    if _file:
-        _file = _mk_single_path_wrapper('file', _file)
-    _open = _mk_single_path_wrapper('open', _open)
-    for name in [
-        "stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir",
-        "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat",
-        "startfile", "mkfifo", "mknod", "pathconf", "access"
-    ]:
-        if hasattr(_os, name):
-            locals()[name] = _mk_single_path_wrapper(name)
-
-    def _mk_single_with_return(name):
-        original = getattr(_os, name)
-
-        def wrap(self, path, *args, **kw):
-            if self._active:
-                path = self._remap_input(name, path, *args, **kw)
-                return self._remap_output(name, original(path, *args, **kw))
-            return original(path, *args, **kw)
-
-        return wrap
-
-    for name in ['readlink', 'tempnam']:
-        if hasattr(_os, name):
-            locals()[name] = _mk_single_with_return(name)
-
-    def _mk_query(name):
-        original = getattr(_os, name)
-
-        def wrap(self, *args, **kw):
-            retval = original(*args, **kw)
-            if self._active:
-                return self._remap_output(name, retval)
-            return retval
-
-        return wrap
-
-    for name in ['getcwd', 'tmpnam']:
-        if hasattr(_os, name):
-            locals()[name] = _mk_query(name)
-
-    def _validate_path(self, path):
-        """Called to remap or validate any path, whether input or output"""
-        return path
-
-    def _remap_input(self, operation, path, *args, **kw):
-        """Called for path inputs"""
-        return self._validate_path(path)
-
-    def _remap_output(self, operation, path):
-        """Called for path outputs"""
-        return self._validate_path(path)
-
-    def _remap_pair(self, operation, src, dst, *args, **kw):
-        """Called for path pairs like rename, link, and symlink operations"""
-        return (
-            self._remap_input(operation + '-from', src, *args, **kw),
-            self._remap_input(operation + '-to', dst, *args, **kw)
-        )
-
-
-if hasattr(os, 'devnull'):
-    _EXCEPTIONS = [os.devnull]
-else:
-    _EXCEPTIONS = []
-
-
-class DirectorySandbox(AbstractSandbox):
-    """Restrict operations to a single subdirectory - pseudo-chroot"""
-
-    write_ops = dict.fromkeys([
-        "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir",
-        "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
-    ])
-
-    _exception_patterns = [
-        # Allow lib2to3 to attempt to save a pickled grammar object (#121)
-        r'.*lib2to3.*\.pickle$',
-    ]
-    "exempt writing to paths that match the pattern"
-
-    def __init__(self, sandbox, exceptions=_EXCEPTIONS):
-        self._sandbox = os.path.normcase(os.path.realpath(sandbox))
-        self._prefix = os.path.join(self._sandbox, '')
-        self._exceptions = [
-            os.path.normcase(os.path.realpath(path))
-            for path in exceptions
-        ]
-        AbstractSandbox.__init__(self)
-
-    def _violation(self, operation, *args, **kw):
-        from setuptools.sandbox import SandboxViolation
-        raise SandboxViolation(operation, args, kw)
-
-    if _file:
-
-        def _file(self, path, mode='r', *args, **kw):
-            if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
-                self._violation("file", path, mode, *args, **kw)
-            return _file(path, mode, *args, **kw)
-
-    def _open(self, path, mode='r', *args, **kw):
-        if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
-            self._violation("open", path, mode, *args, **kw)
-        return _open(path, mode, *args, **kw)
-
-    def tmpnam(self):
-        self._violation("tmpnam")
-
-    def _ok(self, path):
-        active = self._active
-        try:
-            self._active = False
-            realpath = os.path.normcase(os.path.realpath(path))
-            return (
-                self._exempted(realpath)
-                or realpath == self._sandbox
-                or realpath.startswith(self._prefix)
-            )
-        finally:
-            self._active = active
-
-    def _exempted(self, filepath):
-        start_matches = (
-            filepath.startswith(exception)
-            for exception in self._exceptions
-        )
-        pattern_matches = (
-            re.match(pattern, filepath)
-            for pattern in self._exception_patterns
-        )
-        candidates = itertools.chain(start_matches, pattern_matches)
-        return any(candidates)
-
-    def _remap_input(self, operation, path, *args, **kw):
-        """Called for path inputs"""
-        if operation in self.write_ops and not self._ok(path):
-            self._violation(operation, os.path.realpath(path), *args, **kw)
-        return path
-
-    def _remap_pair(self, operation, src, dst, *args, **kw):
-        """Called for path pairs like rename, link, and symlink operations"""
-        if not self._ok(src) or not self._ok(dst):
-            self._violation(operation, src, dst, *args, **kw)
-        return (src, dst)
-
-    def open(self, file, flags, mode=0o777, *args, **kw):
-        """Called for low-level os.open()"""
-        if flags & WRITE_FLAGS and not self._ok(file):
-            self._violation("os.open", file, flags, mode, *args, **kw)
-        return _os.open(file, flags, mode, *args, **kw)
-
-
-WRITE_FLAGS = functools.reduce(
-    operator.or_, [
-        getattr(_os, a, 0) for a in
-        "O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()]
-)
-
-
-class SandboxViolation(DistutilsError):
-    """A setup script attempted to modify the filesystem outside the sandbox"""
-
-    tmpl = textwrap.dedent("""
-        SandboxViolation: {cmd}{args!r} {kwargs}
-
-        The package setup script has attempted to modify files on your system
-        that are not within the EasyInstall build area, and has been aborted.
-
-        This package cannot be safely installed by EasyInstall, and may not
-        support alternate installation locations even if you run its setup
-        script by hand.  Please inform the package's author and the EasyInstall
-        maintainers to find out if a fix or workaround is available.
-        """).lstrip()
-
-    def __str__(self):
-        cmd, args, kwargs = self.args
-        return self.tmpl.format(**locals())