mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2024-12-22 14:22:25 +00:00
288 lines
8.1 KiB
Python
288 lines
8.1 KiB
Python
import os, sys, __builtin__, tempfile, operator, pkg_resources
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_os = sys.modules[os.name]
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_open = open
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_file = file
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from distutils.errors import DistutilsError
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from pkg_resources import working_set
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__all__ = [
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"AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
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]
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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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old_dir = os.getcwd()
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save_argv = sys.argv[:]
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save_path = sys.path[:]
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setup_dir = os.path.abspath(os.path.dirname(setup_script))
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temp_dir = os.path.join(setup_dir,'temp')
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if not os.path.isdir(temp_dir): os.makedirs(temp_dir)
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save_tmp = tempfile.tempdir
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save_modules = sys.modules.copy()
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pr_state = pkg_resources.__getstate__()
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try:
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tempfile.tempdir = temp_dir; os.chdir(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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DirectorySandbox(setup_dir).run(
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lambda: execfile(
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"setup.py",
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{'__file__':setup_script, '__name__':'__main__'}
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)
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)
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except SystemExit, 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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finally:
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pkg_resources.__setstate__(pr_state)
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sys.modules.update(save_modules)
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for key in list(sys.modules):
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if key not in save_modules: del sys.modules[key]
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os.chdir(old_dir)
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sys.path[:] = save_path
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sys.argv[:] = save_argv
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tempfile.tempdir = save_tmp
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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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__builtin__.file = self._file
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__builtin__.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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__builtin__.open = _open
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__builtin__.file = _file
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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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_open = _mk_single_path_wrapper('open', _open)
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_file = _mk_single_path_wrapper('file', _file)
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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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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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def __init__(self,sandbox):
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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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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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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): self._violation("tmpnam")
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def _ok(self,path):
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if hasattr(_os,'devnull') and path==_os.devnull: return True
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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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if realpath==self._sandbox or realpath.startswith(self._prefix):
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return True
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finally:
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self._active = active
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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 _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, file, flags, mode=0777):
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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)
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return _os.open(file,flags,mode)
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WRITE_FLAGS = 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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