updates

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

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+import os
+import stat
+import sys
+from errno import EACCES, EISDIR
+from pathlib import Path
+
+
+def raise_on_not_writable_file(filename: str) -> None:
+    """
+    Raise an exception if attempting to open the file for writing would fail.
+
+    This is done so files that will never be writable can be separated from files that are writable but currently
+    locked.
+
+    :param filename: file to check
+    :raises OSError: as if the file was opened for writing.
+
+    """
+    try:  # use stat to do exists + can write to check without race condition
+        file_stat = os.stat(filename)  # noqa: PTH116
+    except OSError:
+        return  # swallow does not exist or other errors
+
+    if file_stat.st_mtime != 0:  # if os.stat returns but modification is zero that's an invalid os.stat - ignore it
+        if not (file_stat.st_mode & stat.S_IWUSR):
+            raise PermissionError(EACCES, "Permission denied", filename)
+
+        if stat.S_ISDIR(file_stat.st_mode):
+            if sys.platform == "win32":  # pragma: win32 cover
+                # On Windows, this is PermissionError
+                raise PermissionError(EACCES, "Permission denied", filename)
+            else:  # pragma: win32 no cover # noqa: RET506
+                # On linux / macOS, this is IsADirectoryError
+                raise IsADirectoryError(EISDIR, "Is a directory", filename)
+
+
+def ensure_directory_exists(filename: Path | str) -> None:
+    """
+    Ensure the directory containing the file exists (create it if necessary).
+
+    :param filename: file.
+
+    """
+    Path(filename).parent.mkdir(parents=True, exist_ok=True)
+
+
+__all__ = [
+    "ensure_directory_exists",
+    "raise_on_not_writable_file",
+]