Update app.py

app.py

@@ -17,16 +17,38 @@ from fastapi.responses import JSONResponse, FileResponse, PlainTextResponse
 from fastapi.middleware.cors import CORSMiddleware
 
 # --------------------------
-# CONFIG & PATHS
+# CONFIG & PATHS (robust writable base)
 # --------------------------
-BASE_DIR = pathlib.Path(os.environ.get("TTS_BASE_DIR", "/tmp/tts_app")).resolve()
-FILES_DIR = BASE_DIR / "files"
-VOICES_DIR = BASE_DIR / "voices"         # Writable! We populate models here.
-PIPER_BIN = shutil.which("piper") or "/usr/local/bin/piper"
+import os, pathlib, tempfile
+
+def _first_writable(candidates):
+    for p in candidates:
+        try:
+            path = pathlib.Path(p).resolve()
+            path.mkdir(parents=True, exist_ok=True)
+            # sanity: try to create a tiny temp inside
+            (path / ".write_test").write_text("ok", encoding="utf-8")
+            (path / ".write_test").unlink(missing_ok=True)
+            return path
+        except Exception:
+            continue
+    # last resort: use Python's temp dir
+    return pathlib.Path(tempfile.gettempdir()).resolve() / "tts_app"
 
+# allow override via env var, else try common writable roots in HF Spaces
+_env_base = os.environ.get("TTS_BASE_DIR", "").strip()
+_candidates = []
+if _env_base:
+    _candidates.append(_env_base)
+_candidates += ["/data/tts_app", "/tmp/tts_app", "/home/user/tts_app"]
+
+BASE_DIR = _first_writable(_candidates)
+BASE_DIR.mkdir(parents=True, exist_ok=True)
+
+FILES_DIR = BASE_DIR / "files"
+VOICES_DIR = BASE_DIR / "voices"
 FILES_DIR.mkdir(parents=True, exist_ok=True)
 VOICES_DIR.mkdir(parents=True, exist_ok=True)
-
 # Known, reliable Piper model URLs (tiny selections). You can add more later.
 # These are Rhasspy / Piper HF mirror direct archives that contain .onnx + .onnx.json.
 KNOWN_VOICES = {