489 lines
14 KiB
Python
489 lines
14 KiB
Python
import os
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import sys
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import tempfile
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import operator
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import functools
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import itertools
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import re
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import contextlib
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import pickle
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import pkg_resources
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if sys.platform.startswith('java'):
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import org.python.modules.posix.PosixModule as _os
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else:
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_os = sys.modules[os.name]
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try:
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_file = file
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except NameError:
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_file = None
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_open = open
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from distutils.errors import DistutilsError
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from pkg_resources import working_set
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from setuptools import compat
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from setuptools.compat import builtins
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__all__ = [
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"AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
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]
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def _execfile(filename, globals, locals=None):
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"""
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Python 3 implementation of execfile.
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"""
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mode = 'rb'
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with open(filename, mode) as stream:
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script = stream.read()
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# compile() function in Python 2.6 and 3.1 requires LF line endings.
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if sys.version_info[:2] < (2, 7) or sys.version_info[:2] >= (3, 0) and sys.version_info[:2] < (3, 2):
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script = script.replace(b'\r\n', b'\n')
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script = script.replace(b'\r', b'\n')
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if locals is None:
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locals = globals
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code = compile(script, filename, 'exec')
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exec(code, globals, locals)
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@contextlib.contextmanager
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def save_argv(repl=None):
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saved = sys.argv[:]
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if repl is not None:
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sys.argv[:] = repl
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try:
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yield saved
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finally:
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sys.argv[:] = saved
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@contextlib.contextmanager
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def save_path():
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saved = sys.path[:]
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try:
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yield saved
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finally:
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sys.path[:] = saved
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@contextlib.contextmanager
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def override_temp(replacement):
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"""
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Monkey-patch tempfile.tempdir with replacement, ensuring it exists
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"""
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if not os.path.isdir(replacement):
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os.makedirs(replacement)
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saved = tempfile.tempdir
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tempfile.tempdir = replacement
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try:
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yield
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finally:
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tempfile.tempdir = saved
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@contextlib.contextmanager
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def pushd(target):
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saved = os.getcwd()
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os.chdir(target)
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try:
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yield saved
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finally:
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os.chdir(saved)
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class UnpickleableException(Exception):
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"""
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An exception representing another Exception that could not be pickled.
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"""
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@classmethod
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def dump(cls, type, exc):
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"""
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Always return a dumped (pickled) type and exc. If exc can't be pickled,
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wrap it in UnpickleableException first.
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"""
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try:
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return pickle.dumps(type), pickle.dumps(exc)
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except Exception:
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return cls.dump(cls, cls(repr(exc)))
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class ExceptionSaver:
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"""
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A Context Manager that will save an exception, serialized, and restore it
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later.
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"""
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def __enter__(self):
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return self
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def __exit__(self, type, exc, tb):
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if not exc:
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return
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# dump the exception
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self._saved = UnpickleableException.dump(type, exc)
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self._tb = tb
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# suppress the exception
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return True
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def resume(self):
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"restore and re-raise any exception"
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if '_saved' not in vars(self):
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return
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type, exc = map(pickle.loads, self._saved)
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compat.reraise(type, exc, self._tb)
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@contextlib.contextmanager
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def save_modules():
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"""
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Context in which imported modules are saved.
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Translates exceptions internal to the context into the equivalent exception
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outside the context.
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"""
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saved = sys.modules.copy()
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with ExceptionSaver() as saved_exc:
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yield saved
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sys.modules.update(saved)
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# remove any modules imported since
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del_modules = (
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mod_name for mod_name in sys.modules
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if mod_name not in saved
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# exclude any encodings modules. See #285
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and not mod_name.startswith('encodings.')
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)
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_clear_modules(del_modules)
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saved_exc.resume()
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def _clear_modules(module_names):
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for mod_name in list(module_names):
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del sys.modules[mod_name]
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@contextlib.contextmanager
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def save_pkg_resources_state():
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saved = pkg_resources.__getstate__()
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try:
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yield saved
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finally:
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pkg_resources.__setstate__(saved)
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@contextlib.contextmanager
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def setup_context(setup_dir):
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temp_dir = os.path.join(setup_dir, 'temp')
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with save_pkg_resources_state():
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with save_modules():
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hide_setuptools()
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with save_path():
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with save_argv():
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with override_temp(temp_dir):
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with pushd(setup_dir):
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# ensure setuptools commands are available
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__import__('setuptools')
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yield
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def _needs_hiding(mod_name):
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"""
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>>> _needs_hiding('setuptools')
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True
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>>> _needs_hiding('pkg_resources')
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True
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>>> _needs_hiding('setuptools_plugin')
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False
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>>> _needs_hiding('setuptools.__init__')
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True
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>>> _needs_hiding('distutils')
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True
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"""
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pattern = re.compile('(setuptools|pkg_resources|distutils)(\.|$)')
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return bool(pattern.match(mod_name))
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def hide_setuptools():
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"""
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Remove references to setuptools' modules from sys.modules to allow the
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invocation to import the most appropriate setuptools. This technique is
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necessary to avoid issues such as #315 where setuptools upgrading itself
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would fail to find a function declared in the metadata.
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"""
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modules = filter(_needs_hiding, sys.modules)
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_clear_modules(modules)
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def run_setup(setup_script, args):
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"""Run a distutils setup script, sandboxed in its directory"""
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setup_dir = os.path.abspath(os.path.dirname(setup_script))
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with setup_context(setup_dir):
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try:
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sys.argv[:] = [setup_script]+list(args)
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sys.path.insert(0, setup_dir)
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# reset to include setup dir, w/clean callback list
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working_set.__init__()
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working_set.callbacks.append(lambda dist:dist.activate())
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def runner():
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ns = dict(__file__=setup_script, __name__='__main__')
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_execfile(setup_script, ns)
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DirectorySandbox(setup_dir).run(runner)
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except SystemExit as v:
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if v.args and v.args[0]:
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raise
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# Normal exit, just return
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class AbstractSandbox:
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"""Wrap 'os' module and 'open()' builtin for virtualizing setup scripts"""
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_active = False
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def __init__(self):
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self._attrs = [
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name for name in dir(_os)
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if not name.startswith('_') and hasattr(self,name)
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]
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def _copy(self, source):
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for name in self._attrs:
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setattr(os, name, getattr(source,name))
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def run(self, func):
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"""Run 'func' under os sandboxing"""
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try:
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self._copy(self)
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if _file:
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builtins.file = self._file
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builtins.open = self._open
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self._active = True
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return func()
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finally:
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self._active = False
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if _file:
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builtins.file = _file
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builtins.open = _open
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self._copy(_os)
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def _mk_dual_path_wrapper(name):
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original = getattr(_os,name)
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def wrap(self,src,dst,*args,**kw):
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if self._active:
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src,dst = self._remap_pair(name,src,dst,*args,**kw)
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return original(src,dst,*args,**kw)
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return wrap
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for name in ["rename", "link", "symlink"]:
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if hasattr(_os,name): locals()[name] = _mk_dual_path_wrapper(name)
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def _mk_single_path_wrapper(name, original=None):
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original = original or getattr(_os,name)
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def wrap(self,path,*args,**kw):
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if self._active:
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path = self._remap_input(name,path,*args,**kw)
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return original(path,*args,**kw)
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return wrap
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if _file:
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_file = _mk_single_path_wrapper('file', _file)
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_open = _mk_single_path_wrapper('open', _open)
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for name in [
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"stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir",
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"remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat",
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"startfile", "mkfifo", "mknod", "pathconf", "access"
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]:
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if hasattr(_os,name): locals()[name] = _mk_single_path_wrapper(name)
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def _mk_single_with_return(name):
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original = getattr(_os,name)
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def wrap(self,path,*args,**kw):
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if self._active:
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path = self._remap_input(name,path,*args,**kw)
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return self._remap_output(name, original(path,*args,**kw))
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return original(path,*args,**kw)
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return wrap
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for name in ['readlink', 'tempnam']:
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if hasattr(_os,name): locals()[name] = _mk_single_with_return(name)
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def _mk_query(name):
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original = getattr(_os,name)
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def wrap(self,*args,**kw):
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retval = original(*args,**kw)
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if self._active:
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return self._remap_output(name, retval)
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return retval
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return wrap
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for name in ['getcwd', 'tmpnam']:
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if hasattr(_os,name): locals()[name] = _mk_query(name)
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def _validate_path(self,path):
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"""Called to remap or validate any path, whether input or output"""
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return path
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def _remap_input(self,operation,path,*args,**kw):
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"""Called for path inputs"""
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return self._validate_path(path)
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def _remap_output(self,operation,path):
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"""Called for path outputs"""
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return self._validate_path(path)
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def _remap_pair(self,operation,src,dst,*args,**kw):
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"""Called for path pairs like rename, link, and symlink operations"""
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return (
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self._remap_input(operation+'-from',src,*args,**kw),
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self._remap_input(operation+'-to',dst,*args,**kw)
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)
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if hasattr(os, 'devnull'):
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_EXCEPTIONS = [os.devnull,]
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else:
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_EXCEPTIONS = []
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try:
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from win32com.client.gencache import GetGeneratePath
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_EXCEPTIONS.append(GetGeneratePath())
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del GetGeneratePath
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except ImportError:
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# it appears pywin32 is not installed, so no need to exclude.
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pass
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class DirectorySandbox(AbstractSandbox):
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"""Restrict operations to a single subdirectory - pseudo-chroot"""
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write_ops = dict.fromkeys([
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"open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir",
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"utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
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])
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_exception_patterns = [
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# Allow lib2to3 to attempt to save a pickled grammar object (#121)
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'.*lib2to3.*\.pickle$',
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]
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"exempt writing to paths that match the pattern"
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def __init__(self, sandbox, exceptions=_EXCEPTIONS):
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self._sandbox = os.path.normcase(os.path.realpath(sandbox))
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self._prefix = os.path.join(self._sandbox,'')
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self._exceptions = [
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os.path.normcase(os.path.realpath(path))
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for path in exceptions
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]
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AbstractSandbox.__init__(self)
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def _violation(self, operation, *args, **kw):
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raise SandboxViolation(operation, args, kw)
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if _file:
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def _file(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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self._violation("file", path, mode, *args, **kw)
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return _file(path,mode,*args,**kw)
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def _open(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path):
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self._violation("open", path, mode, *args, **kw)
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return _open(path,mode,*args,**kw)
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def tmpnam(self):
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self._violation("tmpnam")
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def _ok(self, path):
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active = self._active
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try:
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self._active = False
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realpath = os.path.normcase(os.path.realpath(path))
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return (
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self._exempted(realpath)
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or realpath == self._sandbox
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or realpath.startswith(self._prefix)
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)
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finally:
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self._active = active
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def _exempted(self, filepath):
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start_matches = (
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filepath.startswith(exception)
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for exception in self._exceptions
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)
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pattern_matches = (
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re.match(pattern, filepath)
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for pattern in self._exception_patterns
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)
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candidates = itertools.chain(start_matches, pattern_matches)
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return any(candidates)
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def _remap_input(self, operation, path, *args, **kw):
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"""Called for path inputs"""
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if operation in self.write_ops and not self._ok(path):
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self._violation(operation, os.path.realpath(path), *args, **kw)
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return path
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def _remap_pair(self, operation, src, dst, *args, **kw):
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"""Called for path pairs like rename, link, and symlink operations"""
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if not self._ok(src) or not self._ok(dst):
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self._violation(operation, src, dst, *args, **kw)
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return (src,dst)
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def open(self, file, flags, mode=0o777, *args, **kw):
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"""Called for low-level os.open()"""
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if flags & WRITE_FLAGS and not self._ok(file):
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self._violation("os.open", file, flags, mode, *args, **kw)
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return _os.open(file,flags,mode, *args, **kw)
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WRITE_FLAGS = functools.reduce(
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operator.or_, [getattr(_os, a, 0) for a in
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"O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()]
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)
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class SandboxViolation(DistutilsError):
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"""A setup script attempted to modify the filesystem outside the sandbox"""
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def __str__(self):
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return """SandboxViolation: %s%r %s
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The package setup script has attempted to modify files on your system
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that are not within the EasyInstall build area, and has been aborted.
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This package cannot be safely installed by EasyInstall, and may not
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support alternate installation locations even if you run its setup
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script by hand. Please inform the package's author and the EasyInstall
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maintainers to find out if a fix or workaround is available.""" % self.args
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#
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