Fix: Disable Showing (Secret) Locals on Rich Tracebacks (#42)

* Disable Show Locals on Rich Tracebacks

* Add Warning about Potential Exposure of Secrets when SML_DEBUG is Enabled

Author: AryanAhadinia

README.md

@@ -159,6 +159,18 @@ sml advanced \
 
 ## Development
 
+### Debugging
+
+Set `SML_DEBUG=1` to include local variables in crash tracebacks:
+
+```bash
+export SML_DEBUG=1
+```
+
+By default, local variables are hidden from crash reports.
+
+> **Warning:** `SML_DEBUG=1` may expose secrets (such as your CSCS API key) in crash output. Do not share terminal output captured with this flag enabled.
+
 ### Setting Up Development Environment
 
 ```bash

src/swiss_ai_model_launch/cli/display/live.py

@@ -1,7 +1,11 @@
+import os
 from collections.abc import Coroutine
 from typing import Any
 
+import rich
+from rich.segment import Segments
 from rich.table import Table
+from rich.traceback import Traceback
 from textual.app import App, ComposeResult
 from textual.binding import Binding
 from textual.widgets import Footer, Header, Label, RichLog, TabbedContent, TabPane
@@ -85,6 +89,19 @@ def action_quit_resume(self) -> None:
     def action_quit_kill(self) -> None:
         self.exit(True)
 
+    def _fatal_error(self) -> None:
+        show_locals = os.environ.get("SML_DEBUG", "").lower() in ("1", "true", "yes")
+        self.bell()
+        self._exit_renderables.append(
+            Segments(
+                self.console.render(
+                    Traceback(show_locals=show_locals, width=None, suppress=[rich]),
+                    self.console.options,
+                )
+            )
+        )
+        self._close_messages_no_wait()
+
     def _render_status(self) -> Table:
         s = self._state
         job_status = (