fix: /app dire permission issues

gradio_app.py

@@ -96,42 +96,42 @@ def process_pdf(pdf_file, speaker1_voice, speaker2_voice, provider, api_key, ope
         else:
             os.environ["OPENROUTER_API_BASE"] = openrouter_base or "https://openrouter.ai/api/v1"
 
+        # Check if file is uploaded
         if pdf_file is None:
             return "No file uploaded", None
 
-        # Use /tmp or current directory for temp file creation
-        base_dir = "/tmp" if os.path.exists("/tmp") else os.getcwd()
+        # Use /tmp if writable, else fallback to current directory
+        base_dir = "/tmp" if os.access("/tmp", os.W_OK) else os.getcwd()
 
-        # Create a temp copy of the uploaded PDF
-        pdf_filename = os.path.basename(pdf_file.name)
-        tmp_path = os.path.join(base_dir, f"uploaded_{pdf_filename}")
+        # Save uploaded PDF to temp location
+        tmp_path = os.path.join(base_dir, f"uploaded_{os.path.basename(pdf_file.name)}")
         shutil.copy2(pdf_file.name, tmp_path)
         print(f"[INFO] Uploaded PDF saved at {tmp_path}")
 
-        # Generate the podcast script
+        # Generate podcast script
         transcript, transcript_path = generate_podcast_script(tmp_path, provider=provider)
         if transcript is None:
             return "Error generating transcript", None
 
-        # Define audio output path in the same temp dir
+        # Define output file path
         audio_output_path = os.path.join(
-            base_dir,
-            f"audio_{os.path.splitext(pdf_filename)[0]}.wav"
+            os.path.dirname(tmp_path),
+            f"audio_{os.path.basename(tmp_path).replace('.pdf', '.wav')}"
         )
 
-        # Process audio generation using parallel CPU workers
+        # Generate audio using ProcessPoolExecutor
         with concurrent.futures.ProcessPoolExecutor(max_workers=NUM_WORKERS) as executor:
-            print(f"[INFO] Processing with {NUM_WORKERS} CPU cores")
+            print(f"[INFO] Processing audio with {NUM_WORKERS} CPU cores")
             future = executor.submit(
                 generate_audio_from_script_with_voices,
                 transcript, speaker1_voice, speaker2_voice, audio_output_path
             )
             result = future.result()
 
-        if result is None:
-            return "Error generating audio", None
+            if result is None:
+                return "Error generating audio", None
 
-        return "Process complete!", result
+            return "Process complete!", result
 
     except Exception as e:
         print(f"[ERROR] process_pdf failed: {str(e)}")