Default HF storage mode for Spaces startup

server/config.py

@@ -48,14 +48,16 @@ LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO")
 HF_STORAGE_LABEL = "HF"
 
 
-def _required_env(name: str) -> str:
+def _required_env(name: str, default: str | None = None) -> str:
     value = os.getenv(name, "").strip()
+    if not value and default is not None:
+        value = default.strip()
     if not value:
         raise RuntimeError(f"Missing required environment variable: {name}")
     return value
 
 
-STORAGE_MODE = _required_env("STORAGE_MODE").upper()
+STORAGE_MODE = _required_env("STORAGE_MODE", "HF").upper()
 if STORAGE_MODE != HF_STORAGE_LABEL:
     raise RuntimeError(
         f"Unsupported STORAGE_MODE '{STORAGE_MODE}'. "
@@ -64,7 +66,7 @@ if STORAGE_MODE != HF_STORAGE_LABEL:
 
 HF_TOKEN = _required_env("HF_TOKEN")
 HF_REPO_ID = _required_env("HF_REPO_ID")
-HF_REPO_TYPE = _required_env("HF_REPO_TYPE")
+HF_REPO_TYPE = _required_env("HF_REPO_TYPE", "dataset")
 if HF_REPO_TYPE not in {"dataset", "model", "space"}:
     raise RuntimeError(
         "Invalid HF_REPO_TYPE. Supported values are: dataset, model, space."