Tooltron

import os, sys, __builtin__, tempfile, operator, pkg_resources

_os = sys.modules[os.name]

try:

    _file = file

except NameError:

    _file = None

_open = open

from distutils.errors import DistutilsError

__all__ = [

    "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",

]

def run_setup(setup_script, args):

    """Run a distutils setup script, sandboxed in its directory"""

    old_dir = os.getcwd()

    save_argv = sys.argv[:]

    save_path = sys.path[:]

    setup_dir = os.path.abspath(os.path.dirname(setup_script))

    temp_dir = os.path.join(setup_dir,'temp')

    if not os.path.isdir(temp_dir): os.makedirs(temp_dir)

    save_tmp = tempfile.tempdir

    save_modules = sys.modules.copy()

    pr_state = pkg_resources.__getstate__()

    try:

        tempfile.tempdir = temp_dir

        os.chdir(setup_dir)

        try:

            sys.argv[:] = [setup_script]+list(args)

            sys.path.insert(0, setup_dir)

            DirectorySandbox(setup_dir).run(

                lambda: execfile(

                    "setup.py",

                    {'__file__':setup_script, '__name__':'__main__'}

                )

            )

        except SystemExit, v:

            if v.args and v.args[0]:

                raise

            # Normal exit, just return

    finally:

        pkg_resources.__setstate__(pr_state)

        sys.modules.update(save_modules)

        for key in list(sys.modules):

            if key not in save_modules: del sys.modules[key]

        os.chdir(old_dir)

        sys.path[:] = save_path

        sys.argv[:] = save_argv

        tempfile.tempdir = save_tmp

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 run(self, func):

        """Run 'func' under os sandboxing"""

        try:

            self._copy(self)

            if _file:

                __builtin__.file = self._file

            __builtin__.open = self._open

            self._active = True

            return func()

        finally:

            self._active = False

            if _file:

                __builtin__.file = _file

            __builtin__.open = _open

            self._copy(_os)

    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 = []

try:

        from win32com.client.gencache import GetGeneratePath

        _EXCEPTIONS.append(GetGeneratePath())

        del GetGeneratePath

except ImportError:

        # it appears pywin32 is not installed, so no need to exclude.

        pass

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",

    ])

    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):

        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))

            if (self._exempted(realpath) or realpath == self._sandbox

                or realpath.startswith(self._prefix)):

                return True

        finally:

            self._active = active

    def _exempted(self, filepath):

        exception_matches = map(filepath.startswith, self._exceptions)

        return True in exception_matches

    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=0777):

        """Called for low-level os.open()"""

        if flags & WRITE_FLAGS and not self._ok(file):

            self._violation("os.open", file, flags, mode)

        return _os.open(file,flags,mode)

WRITE_FLAGS = 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"""

    def __str__(self):

        return """SandboxViolation: %s%r %s

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.""" % self.args

#