fix: preflight Hugging Face GGUF disk space

dashboard/plugin_api.py

@@ -1539,6 +1539,18 @@ def _run_huggingface_download(job_id: str, repo_id: str, filename: str) -> None:
         download_files = list(file_info.get("filenames") or [filename])
         completed = 0
         total = expected
+        if not total:
+            for remote_filename in download_files:
+                head_url = f"https://huggingface.co/{repo_id}/resolve/main/{remote_filename}?download=true"
+                try:
+                    head_request = Request(head_url, method="HEAD", headers={"User-Agent": "Hermes-Ollama-Models/1.7.4"})
+                    with urlopen(head_request, timeout=30) as head_response:
+                        total += int(head_response.headers.get("Content-Length") or 0)
+                except (HTTPError, URLError, OSError, ValueError):
+                    continue
+            free_bytes = shutil.disk_usage(_home()).free
+            if total and free_bytes < total + 1024 ** 3:
+                raise RuntimeError("Insufficient free disk space for the complete Hugging Face GGUF download")
         for remote_filename in download_files:
             destination = destination_root / remote_filename
             destination.parent.mkdir(parents=True, exist_ok=True)