updates

Backend/venv/lib/python3.12/site-packages/filelock/_soft.py

@@ -0,0 +1,47 @@
+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",
+]