Add run_python_code_safely.py as generated by perplexity, plus ruff format, bandit nosec

Author: rwgk

cuda_bindings/cuda/bindings/_path_finder/run_python_code_safely.py

@@ -0,0 +1,64 @@
+import multiprocessing
+import subprocess  # nosec B404
+import sys
+from io import StringIO
+
+
+def run_python_code_safely(python_code, timeout=None):
+    """Replacement for subprocess.run that forces 'spawn' context"""
+    ctx = multiprocessing.get_context("spawn")
+    result_queue = ctx.Queue()
+
+    def worker():
+        # Capture stdout/stderr
+        old_stdout = sys.stdout
+        old_stderr = sys.stderr
+        sys.stdout = StringIO()
+        sys.stderr = StringIO()
+
+        returncode = 0
+        try:
+            exec(python_code, {"__name__": "__main__"})  # nosec B102
+        except SystemExit as e:  # Handle sys.exit()
+            returncode = e.code if isinstance(e.code, int) else 0
+        except Exception:  # Capture other exceptions
+            import traceback
+
+            traceback.print_exc()
+            returncode = 1
+        finally:
+            # Collect outputs and restore streams
+            stdout = sys.stdout.getvalue()
+            stderr = sys.stderr.getvalue()
+            sys.stdout = old_stdout
+            sys.stderr = old_stderr
+            result_queue.put((returncode, stdout, stderr))
+
+    process = ctx.Process(target=worker)
+    process.start()
+
+    try:
+        # Wait with timeout support
+        process.join(timeout)
+        if process.is_alive():
+            process.terminate()
+            process.join()
+            raise subprocess.TimeoutExpired([sys.executable, "-c", python_code], timeout)
+
+        # Get results from queue
+        if result_queue.empty():
+            return subprocess.CompletedProcess(
+                [sys.executable, "-c", python_code],
+                returncode=-999,
+                stdout="",
+                stderr="Process failed to return results",
+            )
+
+        returncode, stdout, stderr = result_queue.get()
+        return subprocess.CompletedProcess(
+            [sys.executable, "-c", python_code], returncode=returncode, stdout=stdout, stderr=stderr
+        )
+    finally:
+        # Cleanup if needed
+        if process.is_alive():
+            process.kill()