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File Name : _soft.py

from __future__ import annotations

import os
import sys
from contextlib import suppress
from errno import EACCES, EEXIST
from pathlib import Path

from ._api import BaseFileLock
from ._util import ensure_directory_exists, raise_on_not_writable_file

class SoftFileLock(BaseFileLock):
    """Simply watches the existence of the lock file."""

def _acquire(self) -> None:
        raise_on_not_writable_file(self.lock_file)
        ensure_directory_exists(self.lock_file)
        # first check for exists and read-only mode as the open will mask this case as EEXIST
        flags = (
            os.O_WRONLY  # open for writing only
            | os.O_CREAT
            | os.O_EXCL  # together with above raise EEXIST if the file specified by filename exists
            | os.O_TRUNC  # truncate the file to zero byte
        )
        try:
            file_handler = os.open(self.lock_file, flags, self._context.mode)
        except OSError as exception:  # re-raise unless expected exception
            if not (
                exception.errno == EEXIST  # lock already exist
                or (exception.errno == EACCES and sys.platform == "win32")  # has no access to this lock
            ):  # pragma: win32 no cover
                raise
        else:
            self._context.lock_file_fd = file_handler

def _release(self) -> None:
        assert self._context.lock_file_fd is not None  # noqa: S101
        os.close(self._context.lock_file_fd)  # the lock file is definitely not None
        self._context.lock_file_fd = None
        with suppress(OSError):  # the file is already deleted and that's what we want
            Path(self.lock_file).unlink()

__all__ = [
    "SoftFileLock",
]

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 08:00:29
..	dir	-	root/root	0755	2025-05-23 07:03:49
__pycache__	dir	-	root/root	0755	2025-04-04 08:00:29
__init__.py	text/plain	1.73 KB	root/root	0644	2025-04-04 08:00:29
_api.py	text/x-script.python	14.2 KB	root/root	0644	2025-04-04 08:00:29
_error.py	text/x-script.python	787 B	root/root	0644	2025-04-04 08:00:29
_soft.py	text/x-script.python	1.67 KB	root/root	0644	2025-04-04 08:00:29
_unix.py	text/x-script.python	2.3 KB	root/root	0644	2025-04-04 08:00:29
_util.py	text/x-script.python	1.67 KB	root/root	0644	2025-04-04 08:00:29
_windows.py	text/x-script.python	2.13 KB	root/root	0644	2025-04-04 08:00:29
asyncio.py	text/plain	12.16 KB	root/root	0644	2025-04-04 08:00:29
py.typed	application/x-empty	0 B	root/root	0644	2025-04-04 08:00:29
version.py	text/plain	513 B	root/root	0644	2025-04-04 08:00:29

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