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Edit File : filesystem.py \| Size : 3.26 KB
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) Back

Edit File : filesystem.py | Size : 3.26 KB

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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