[core] respect local_files_only=True when using sharded checkpoints

src/diffusers/utils/hub_utils.py

@@ -45,6 +45,7 @@
 )
 from packaging import version
 from requests import HTTPError
+from requests.exceptions import ConnectionError
 
 from .. import __version__
 from .constants import (
@@ -403,9 +404,26 @@ def _get_checkpoint_shard_files(
 
     ignore_patterns = ["*.json", "*.md"]
     # `model_info` call must guarded with the above condition.
-    model_files_info = model_info(pretrained_model_name_or_path, revision=revision, token=token)
+    local = False
+    try:
+        model_files_info = model_info(pretrained_model_name_or_path, revision=revision, token=token)
+    except ConnectionError as e:
+        if local_files_only:
+            temp_dir = snapshot_download(
+                repo_id=pretrained_model_name_or_path, cache_dir=cache_dir, local_files_only=local_files_only
+            )
+            model_files_info = _get_filepaths_for_folder(temp_dir)
+            local = True
+        else:
+            raise EnvironmentError(
+                f"We couldn't connect to '{HUGGINGFACE_CO_RESOLVE_ENDPOINT}' to load {pretrained_model_name_or_path}. You should try"
+                " again after checking your internet connection."
+            ) from e
     for shard_file in original_shard_filenames:
-        shard_file_present = any(shard_file in k.rfilename for k in model_files_info.siblings)
+        if local:
+            shard_file_present = any(shard_file in k for k in model_files_info)
+        else:
+            shard_file_present = any(shard_file in k.rfilename for k in model_files_info.siblings)
         if not shard_file_present:
             raise EnvironmentError(
                 f"{shards_path} does not appear to have a file named {shard_file} which is "
@@ -441,6 +459,16 @@ def _get_checkpoint_shard_files(
     return cached_filenames, sharded_metadata
 
 
+def _get_filepaths_for_folder(folder):
+    relative_paths = []
+    for root, dirs, files in os.walk(folder):
+        for fname in files:
+            abs_path = os.path.join(root, fname)
+            rel_path = os.path.relpath(abs_path, start=folder)
+            relative_paths.append(rel_path)
+    return relative_paths
+
+
 def _check_legacy_sharding_variant_format(folder: str = None, filenames: List[str] = None, variant: str = None):
     if filenames and folder:
         raise ValueError("Both `filenames` and `folder` cannot be provided.")