Simplify Docker logging and fix preview app working directory

app.py

@@ -84,10 +84,14 @@ def start_preview_app():
 
     print(f"🚀 Starting preview app from `{app_file}` on port {PREVIEW_PORT}...")
     try:
+        # Change to the directory containing the app file
+        app_dir = str(Path(app_file).parent)
+        app_filename = Path(app_file).name
+
         preview_process = subprocess.Popen(
             [
                 "python",
-                app_file,
+                app_filename,
                 "--server-port",
                 str(PREVIEW_PORT),
                 "--server-name",
@@ -96,6 +100,7 @@ def start_preview_app():
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             text=True,
+            cwd=app_dir,  # Set working directory to the app directory
         )
         # Give it a moment to start up
         time.sleep(3)
@@ -103,9 +108,10 @@ def start_preview_app():
             print(f"✅ Preview app started successfully (PID: {preview_process.pid}).")
             return True, f"Preview running at {PREVIEW_URL}"
         else:
-            stderr = preview_process.stderr.read()
-            print(f"❌ Failed to start preview app. Error:\n{stderr}")
-            return False, f"Failed to start preview app:\n{stderr}"
+            stdout, stderr = preview_process.communicate()
+            error_msg = f"STDOUT:\n{stdout}\nSTDERR:\n{stderr}"
+            print(f"❌ Failed to start preview app. Error:\n{error_msg}")
+            return False, f"Failed to start preview app:\n{error_msg}"
     except Exception as e:
         print(f"❌ Exception while starting preview app: {e}")
         return False, f"Error starting preview app: {e}"

start.sh

@@ -1,29 +1,24 @@
 #!/bin/bash
 
 # Start nginx in background as non-root user
+echo "Starting nginx..."
 nginx -g 'daemon off;' &
 NGINX_PID=$!
 
-# Wait a moment for nginx to start
-sleep 2
-
-# Start the main Gradio app on port 7862 (internal)
-python app.py --server-port 7862 --server-name 0.0.0.0 &
-APP_PID=$!
-
 # Function to handle shutdown
 cleanup() {
     echo "Shutting down..."
-    kill $NGINX_PID $APP_PID 2>/dev/null
-    wait $NGINX_PID $APP_PID 2>/dev/null
+    kill $NGINX_PID 2>/dev/null
+    wait $NGINX_PID 2>/dev/null
     exit 0
 }
 
 # Set up signal handlers
 trap cleanup SIGTERM SIGINT
 
-# Wait for any process to exit
-wait -n
+# Wait a moment for nginx to start
+sleep 2
 
-# If we get here, one process exited, so clean up
-cleanup
+echo "Starting Gradio app on port 7862..."
+# Run the main app in foreground so Docker captures its logs
+python app.py --server-port 7862 --server-name 0.0.0.0