From 970cda0ce631ae97ab2223b5ce5f7a49295c6d24 Mon Sep 17 00:00:00 2001
From: Gabriel Ferreira <gabrielcarvfer@gmail.com>
Date: Mon, 13 Oct 2025 23:34:52 +0200
Subject: [PATCH] build: Check if allow-run-as-root is an mpi option by
 executing `cmake` instead of `dir`

---
 ns3 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ns3 b/ns3
index 1b95a22aa..6a5580678 100755
--- a/ns3
+++ b/ns3
@@ -1540,7 +1540,11 @@ def run_step(args, target_to_run, target_args):
             if target_to_run in ["mpiexec", "mpirun"] and os.getenv("MPI_CI"):
                 if shutil.which("ompi_info"):
                     try:
-                        subprocess.check_call([target_to_run, "--allow-run-as-root", "dir"])
+                        subprocess.check_call(
+                            [target_to_run, "--allow-run-as-root", "cmake", "--version"],
+                            stdout=subprocess.DEVNULL,
+                            stderr=subprocess.DEVNULL,
+                        )
                         target_args = ["--allow-run-as-root"] + target_args
                     except subprocess.CalledProcessError:
                         pass