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import os import os.path import shutil import stat from contextlib import contextmanager from tempfile import NamedTemporaryFile # NOTE: retrying is not annotated in typeshed as on 2017-07-17, which is # why we ignore the type on this import. from pip._vendor.retrying import retry # type: ignore from pip._vendor.six import PY2 from pip._internal.utils.compat import get_path_uid from pip._internal.utils.misc import cast from pip._internal.utils.typing import MYPY_CHECK_RUNNING if MYPY_CHECK_RUNNING: from typing import BinaryIO, Iterator class NamedTemporaryFileResult(BinaryIO): @property def file(self): # type: () -> BinaryIO pass def check_path_owner(path): # type: (str) -> bool # If we don't have a way to check the effective uid of this process, then # we'll just assume that we own the directory. if not hasattr(os, "geteuid"): return True previous = None while path != previous: if os.path.lexists(path): # Check if path is writable by current user. if os.geteuid() == 0: # Special handling for root user in order to handle properly # cases where users use sudo without -H flag. try: path_uid = get_path_uid(path) except OSError: return False return path_uid == 0 else: return os.access(path, os.W_OK) else: previous, path = path, os.path.dirname(path) return False # assume we don't own the path def copy2_fixed(src, dest): # type: (str, str) -> None """Wrap shutil.copy2() but map errors copying socket files to SpecialFileError as expected. See also https://bugs.python.org/issue37700. """ try: shutil.copy2(src, dest) except (OSError, IOError): for f in [src, dest]: try: is_socket_file = is_socket(f) except OSError: # An error has already occurred. Another error here is not # a problem and we can ignore it. pass else: if is_socket_file: raise shutil.SpecialFileError("`%s` is a socket" % f) raise def is_socket(path): # type: (str) -> bool return stat.S_ISSOCK(os.lstat(path).st_mode) @contextmanager def adjacent_tmp_file(path): # type: (str) -> Iterator[NamedTemporaryFileResult] """Given a path to a file, open a temp file next to it securely and ensure it is written to disk after the context reaches its end. """ with NamedTemporaryFile( delete=False, dir=os.path.dirname(path), prefix=os.path.basename(path), suffix='.tmp', ) as f: result = cast('NamedTemporaryFileResult', f) try: yield result finally: result.file.flush() os.fsync(result.file.fileno()) _replace_retry = retry(stop_max_delay=1000, wait_fixed=250) if PY2: @_replace_retry def replace(src, dest): # type: (str, str) -> None try: os.rename(src, dest) except OSError: os.remove(dest) os.rename(src, dest) else: replace = _replace_retry(os.replace)
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