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Edit File : _unix.py \| Size : 2.30 KB
from __future__ import annotations import os import sys from contextlib import suppress from errno import ENOSYS from pathlib import Path from typing import cast from ._api import BaseFileLock from ._util import ensure_directory_exists #: a flag to indicate if the fcntl API is available has_fcntl = False if sys.platform == "win32": # pragma: win32 cover class UnixFileLock(BaseFileLock): """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems.""" def _acquire(self) -> None: raise NotImplementedError def _release(self) -> None: raise NotImplementedError else: # pragma: win32 no cover try: import fcntl _ = (fcntl.flock, fcntl.LOCK_EX, fcntl.LOCK_NB, fcntl.LOCK_UN) except (ImportError, AttributeError): pass else: has_fcntl = True class UnixFileLock(BaseFileLock): """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems.""" def _acquire(self) -> None: ensure_directory_exists(self.lock_file) open_flags = os.O_RDWR \| os.O_TRUNC if not Path(self.lock_file).exists(): open_flags \|= os.O_CREAT fd = os.open(self.lock_file, open_flags, self._context.mode) with suppress(PermissionError): # This locked is not owned by this UID os.fchmod(fd, self._context.mode) try: fcntl.flock(fd, fcntl.LOCK_EX \| fcntl.LOCK_NB) except OSError as exception: os.close(fd) if exception.errno == ENOSYS: # NotImplemented error msg = "FileSystem does not appear to support flock; use SoftFileLock instead" raise NotImplementedError(msg) from exception else: self._context.lock_file_fd = fd def _release(self) -> None: # Do not remove the lockfile: # https://github.com/tox-dev/py-filelock/issues/31 # https://stackoverflow.com/questions/17708885/flock-removing-locked-file-without-race-condition fd = cast("int", self._context.lock_file_fd) self._context.lock_file_fd = None fcntl.flock(fd, fcntl.LOCK_UN) os.close(fd) __all__ = [ "UnixFileLock", "has_fcntl", ] Back

Edit File : _unix.py | Size : 2.30 KB

from __future__ import annotations

import os
import sys
from contextlib import suppress
from errno import ENOSYS
from pathlib import Path
from typing import cast

from ._api import BaseFileLock
from ._util import ensure_directory_exists

#: a flag to indicate if the fcntl API is available
has_fcntl = False
if sys.platform == "win32":  # pragma: win32 cover

class UnixFileLock(BaseFileLock):
        """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems."""

def _acquire(self) -> None:
            raise NotImplementedError

def _release(self) -> None:
            raise NotImplementedError

else:  # pragma: win32 no cover
    try:
        import fcntl

_ = (fcntl.flock, fcntl.LOCK_EX, fcntl.LOCK_NB, fcntl.LOCK_UN)
    except (ImportError, AttributeError):
        pass
    else:
        has_fcntl = True

class UnixFileLock(BaseFileLock):
        """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems."""

def _acquire(self) -> None:
            ensure_directory_exists(self.lock_file)
            open_flags = os.O_RDWR | os.O_TRUNC
            if not Path(self.lock_file).exists():
                open_flags |= os.O_CREAT
            fd = os.open(self.lock_file, open_flags, self._context.mode)
            with suppress(PermissionError):  # This locked is not owned by this UID
                os.fchmod(fd, self._context.mode)
            try:
                fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
            except OSError as exception:
                os.close(fd)
                if exception.errno == ENOSYS:  # NotImplemented error
                    msg = "FileSystem does not appear to support flock; use SoftFileLock instead"
                    raise NotImplementedError(msg) from exception
            else:
                self._context.lock_file_fd = fd

def _release(self) -> None:
            # Do not remove the lockfile:
            #   https://github.com/tox-dev/py-filelock/issues/31
            #   https://stackoverflow.com/questions/17708885/flock-removing-locked-file-without-race-condition
            fd = cast("int", self._context.lock_file_fd)
            self._context.lock_file_fd = None
            fcntl.flock(fd, fcntl.LOCK_UN)
            os.close(fd)

__all__ = [
    "UnixFileLock",
    "has_fcntl",
]

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