Fix fsspec local file protocol checks for new fsspec version

requirements/app/app.txt

@@ -3,7 +3,7 @@ packaging
 typing-extensions >=4.4.0, <4.8.0
 deepdiff >=5.7.0, <6.6.0
 starsessions >=1.2.1, <2.0 # strict
-fsspec >=2022.5.0, <2023.10.0
+fsspec >=2022.5.0, <2023.11.0
 croniter >=1.3.0, <1.5.0  # strict; TODO: for now until we find something more robust.
 traitlets >=5.3.0, <5.10.0
 arrow >=1.2.0, <1.3.0

requirements/data/cloud.txt

@@ -1,5 +1,5 @@
 # NOTE: the upper bound for the package version is only set for CI stability, and it is dropped while installing this package
 #  in case you want to preserve/enforce restrictions on the latest compatible version, add "strict" as an in-line comment
 
-fsspec[http] >2021.06.0, <2023.10.0
+fsspec[http] >2021.06.0, <2023.11.0
 s3fs >=2022.5.0, <2023.7.0

requirements/fabric/base.txt

@@ -3,7 +3,7 @@
 
 numpy >=1.17.2, <1.27.0
 torch >=1.12.0, <2.2.0
-fsspec[http]>2021.06.0, <2023.10.0
+fsspec[http]>2021.06.0, <2023.11.0
 packaging >=20.0, <=23.1
 typing-extensions >=4.4.0, <4.8.0
 lightning-utilities >=0.8.0, <0.10.0

requirements/pytorch/base.txt

@@ -5,7 +5,7 @@ numpy >=1.17.2, <1.27.0
 torch >=1.12.0, <2.2.0
 tqdm >=4.57.0, <4.67.0
 PyYAML >=5.4, <6.1.0
-fsspec[http] >2021.06.0, <2023.10.0
+fsspec[http] >2021.06.0, <2023.11.0
 torchmetrics >=0.7.0, <1.3.0  # needed for using fixed compare_version
 packaging >=20.0, <=23.1
 typing-extensions >=4.4.0, <4.8.0

src/lightning/fabric/utilities/cloud_io.py

@@ -18,6 +18,7 @@
 from typing import IO, Any, Dict, Union
 
 import fsspec
+import fsspec.utils
 import torch
 from fsspec.core import url_to_fs
 from fsspec.implementations.local import AbstractFileSystem
@@ -128,3 +129,7 @@ def _is_dir(fs: AbstractFileSystem, path: Union[str, Path], strict: bool = False
         return not fs.isfile(path)
 
     return fs.isdir(path)
+
+
+def _is_local_file_protocol(path: _PATH) -> bool:
+    return fsspec.utils.get_protocol(str(path)) == "file"

src/lightning/fabric/utilities/distributed.py

@@ -6,13 +6,13 @@
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Iterable, Iterator, List, Optional, Sized, Union
 
-import fsspec.utils
 import torch
 import torch.nn.functional as F
 from lightning_utilities.core.imports import package_available
 from torch import Tensor
 from torch.utils.data import Dataset, DistributedSampler, Sampler
 
+from lightning.fabric.utilities.cloud_io import _is_local_file_protocol
 from lightning.fabric.utilities.data import _num_cpus_available
 from lightning.fabric.utilities.rank_zero import rank_zero_info
 from lightning.fabric.utilities.types import _PATH, ReduceOp
@@ -48,7 +48,7 @@ def is_shared_filesystem(strategy: "Strategy", path: Optional[_PATH] = None, tim
 
     """
     # Fast path: Any non-local filesystem is considered shared (e.g., S3)
-    if path is not None and fsspec.utils.get_protocol(str(path)) != "file":
+    if path is not None and not _is_local_file_protocol(path):
         return True
 
     path = Path(Path.cwd() if path is None else path).resolve()

src/lightning/pytorch/CHANGELOG.md

@@ -41,7 +41,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
--
+- Fixed checks for local file protocol due to fsspec changes in 2023.10.0 ([#19023](https://github.com/Lightning-AI/lightning/pull/19023))
+
 
 
 ## [2.1.2] - 2023-11-15
@@ -52,6 +53,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed an issue where Metric instances from `torchmetrics` wouldn't get moved to the device when using FSDP ([#18954](https://github.com/Lightning-AI/lightning/issues/18954))
 - Fixed an issue preventing the user to `Trainer.save_checkpoint()` an FSDP model when `Trainer.test/validate/predict()` ran after `Trainer.fit()` ([#18992](https://github.com/Lightning-AI/lightning/issues/18992))
 
+
 ## [2.1.1] - 2023-11-06
 
 ### Fixed

src/lightning/pytorch/callbacks/model_checkpoint.py

@@ -34,7 +34,7 @@
 from torch import Tensor
 
 import lightning.pytorch as pl
-from lightning.fabric.utilities.cloud_io import _is_dir, get_filesystem
+from lightning.fabric.utilities.cloud_io import _is_dir, _is_local_file_protocol, get_filesystem
 from lightning.fabric.utilities.types import _PATH
 from lightning.pytorch.callbacks import Checkpoint
 from lightning.pytorch.utilities.exceptions import MisconfigurationException
@@ -457,7 +457,7 @@ def __validate_init_configuration(self) -> None:
     def __init_ckpt_dir(self, dirpath: Optional[_PATH], filename: Optional[str]) -> None:
         self._fs = get_filesystem(dirpath if dirpath else "")
 
-        if dirpath and self._fs.protocol == "file":
+        if dirpath and _is_local_file_protocol(dirpath if dirpath else ""):
             dirpath = os.path.realpath(dirpath)
 
         self.dirpath = dirpath
@@ -675,7 +675,7 @@ def _save_last_checkpoint(self, trainer: "pl.Trainer", monitor_candidates: Dict[
 
         # set the last model path before saving because it will be part of the state.
         previous, self.last_model_path = self.last_model_path, filepath
-        if self._fs.protocol == "file" and self._last_checkpoint_saved and self.save_top_k != 0:
+        if _is_local_file_protocol(filepath) and self._last_checkpoint_saved and self.save_top_k != 0:
             self._link_checkpoint(trainer, self._last_checkpoint_saved, filepath)
         else:
             self._save_checkpoint(trainer, filepath)
@@ -771,7 +771,7 @@ def _should_remove_checkpoint(self, trainer: "pl.Trainer", previous: str, curren
         """
         if previous == current:
             return False
-        if self._fs.protocol != "file":
+        if not _is_local_file_protocol(previous):
             return True
         previous = Path(previous).absolute()
         resume_path = Path(trainer.ckpt_path).absolute() if trainer.ckpt_path is not None else None

src/lightning/pytorch/trainer/trainer.py

@@ -33,7 +33,7 @@
 
 import lightning.pytorch as pl
 from lightning.fabric.utilities.apply_func import convert_tensors_to_scalars
-from lightning.fabric.utilities.cloud_io import get_filesystem
+from lightning.fabric.utilities.cloud_io import _is_local_file_protocol
 from lightning.fabric.utilities.imports import _TORCH_GREATER_EQUAL_2_0
 from lightning.fabric.utilities.types import _PATH
 from lightning.pytorch.accelerators import Accelerator
@@ -1285,7 +1285,7 @@ def default_root_dir(self) -> str:
         It is used as a fallback if logger or checkpoint callback do not define specific save paths.
 
         """
-        if get_filesystem(self._default_root_dir).protocol == "file":
+        if _is_local_file_protocol(self._default_root_dir):
             return os.path.normpath(self._default_root_dir)
         return self._default_root_dir