Update backend/model_loader.py

backend/model_loader.py

@@ -1,16 +1,28 @@
 import os
-import shutil
-from huggingface_hub import snapshot_download, HfApi
+import glob
+from huggingface_hub import snapshot_download
 from civitai import download_civitai_model
 
 def prepare_model(source: str, model_id: str, civitai_key: str = None) -> str:
     if source == "hf":
-        # Use cache, but ensure safetensors available
+        # 簡易バリデーション（念のため）
+        if model_id.startswith("http"):
+            raise ValueError("HuggingFace model_id should be 'repo_name' or 'namespace/repo_name', not a URL.")
         try:
             path = snapshot_download(model_id, cache_dir="/app/data/hf_cache")
-            return path
         except Exception as e:
             raise RuntimeError(f"Failed to download HF model {model_id}: {e}")
+
+        # safetensorsが存在するかチェック（GGUFなどのみのリポジトリ対策）
+        safetensors_files = glob.glob(os.path.join(path, "**", "*.safetensors"), recursive=True)
+        bin_files = glob.glob(os.path.join(path, "**", "*.bin"), recursive=True)  # pytorch_model.bin も一応許容
+        if not safetensors_files and not bin_files:
+            raise RuntimeError(
+                f"No safetensors or pytorch_model.bin files found in {model_id}. "
+                "This repository may only contain GGUF or other non-mergeable formats."
+            )
+        return path
+
     elif source == "civitai":
         if not civitai_key:
             raise ValueError("Civitai API key required")