From fe235468313acb69b8561706982af833a6284ad3 Mon Sep 17 00:00:00 2001
From: Peter Verswyvelen <pv@nvidia.com>
Date: Thu, 28 May 2026 16:39:42 +0000
Subject: [PATCH 1/2] feat: log Kit version info on AppLauncher startup

Prints Kit version, kernel version, and git hash to stderr after
AppLauncher initialization completes. This makes it easy to verify
which Kit/Isaac Sim runtime is actually being used in CI logs without
needing to add ad-hoc version probes to individual tests.

Output is best-effort (wrapped in try/except) so it never breaks
existing tests.
---
 source/isaaclab/isaaclab/app/app_launcher.py | 23 ++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/source/isaaclab/isaaclab/app/app_launcher.py b/source/isaaclab/isaaclab/app/app_launcher.py
index dcc8d1ca53e0..e16cc79ecfe0 100644
--- a/source/isaaclab/isaaclab/app/app_launcher.py
+++ b/source/isaaclab/isaaclab/app/app_launcher.py
@@ -234,6 +234,9 @@ def __init__(self, launcher_args: argparse.Namespace | dict | None = None, **kwa
         # use __stderr__ which is never suppressed.
         print("[ISAACLAB] AppLauncher initialization complete", file=sys.__stderr__, flush=True)
 
+        # Log Kit/runtime version information for diagnostics.
+        self._log_kit_version_info()
+
         # Ensure SimulationApp.close() is called on normal process exit so Kit
         # shuts down cleanly instead of relying on __del__ (which logs a warning
         # and can leave GPU resources in a bad state for the next test).
@@ -1223,6 +1226,26 @@ def _hide_play_button(self, flag):
                 play_button_group._play_button.visible = not flag  # type: ignore
                 play_button_group._play_button.enabled = not flag  # type: ignore
 
+    def _log_kit_version_info(self):
+        """Log Kit and runtime version information for CI diagnostics."""
+        try:
+            import carb
+            import omni.kit.app
+
+            app = omni.kit.app.get_app()
+            tokens = carb.tokens.get_tokens_interface()
+
+            kit_version = app.get_kit_version()
+            kernel_version = app.get_kernel_version()
+            kit_git_hash = tokens.resolve("${kit_git_hash}")
+
+            print(f"[ISAACLAB] Kit version: {kit_version}", file=sys.__stderr__, flush=True)
+            print(f"[ISAACLAB] Kit kernel:  {kernel_version}", file=sys.__stderr__, flush=True)
+            print(f"[ISAACLAB] Kit hash:    {kit_git_hash}", file=sys.__stderr__, flush=True)
+        except Exception:
+            # Non-fatal: version logging is best-effort diagnostics.
+            pass
+
     def _abort_signal_handle_callback(self, signal, frame):
         """Handle the abort/segmentation/kill signals."""
         # close the app

From fc42687cc004cca6a25a6aec69cdb2651e75cea3 Mon Sep 17 00:00:00 2001
From: Peter Verswyvelen <pv@nvidia.com>
Date: Thu, 28 May 2026 16:41:57 +0000
Subject: [PATCH 2/2] chore: add changelog fragment for Kit version logging

---
 .../changelog.d/pv-log-kit-version.rst        |  4 +++
 source/isaaclab/isaaclab/app/app_launcher.py  | 32 ++++++++-----------
 2 files changed, 18 insertions(+), 18 deletions(-)
 create mode 100644 source/isaaclab/changelog.d/pv-log-kit-version.rst

diff --git a/source/isaaclab/changelog.d/pv-log-kit-version.rst b/source/isaaclab/changelog.d/pv-log-kit-version.rst
new file mode 100644
index 000000000000..a951551cc345
--- /dev/null
+++ b/source/isaaclab/changelog.d/pv-log-kit-version.rst
@@ -0,0 +1,4 @@
+Added
+^^^^^
+
+* Added Kit version, kernel version, and git hash logging to :class:`~isaaclab.app.AppLauncher` startup.
diff --git a/source/isaaclab/isaaclab/app/app_launcher.py b/source/isaaclab/isaaclab/app/app_launcher.py
index e16cc79ecfe0..6b8d635c2d62 100644
--- a/source/isaaclab/isaaclab/app/app_launcher.py
+++ b/source/isaaclab/isaaclab/app/app_launcher.py
@@ -1227,24 +1227,20 @@ def _hide_play_button(self, flag):
                 play_button_group._play_button.enabled = not flag  # type: ignore
 
     def _log_kit_version_info(self):
-        """Log Kit and runtime version information for CI diagnostics."""
-        try:
-            import carb
-            import omni.kit.app
-
-            app = omni.kit.app.get_app()
-            tokens = carb.tokens.get_tokens_interface()
-
-            kit_version = app.get_kit_version()
-            kernel_version = app.get_kernel_version()
-            kit_git_hash = tokens.resolve("${kit_git_hash}")
-
-            print(f"[ISAACLAB] Kit version: {kit_version}", file=sys.__stderr__, flush=True)
-            print(f"[ISAACLAB] Kit kernel:  {kernel_version}", file=sys.__stderr__, flush=True)
-            print(f"[ISAACLAB] Kit hash:    {kit_git_hash}", file=sys.__stderr__, flush=True)
-        except Exception:
-            # Non-fatal: version logging is best-effort diagnostics.
-            pass
+        """Log Kit and runtime version information."""
+        import carb
+        import omni.kit.app
+
+        app = omni.kit.app.get_app()
+        tokens = carb.tokens.get_tokens_interface()
+
+        kit_version = app.get_kit_version()
+        kernel_version = app.get_kernel_version()
+        kit_git_hash = tokens.resolve("${kit_git_hash}") or "unknown"
+
+        print(f"[ISAACLAB] Kit version: {kit_version}", file=sys.__stderr__, flush=True)
+        print(f"[ISAACLAB] Kit kernel:  {kernel_version}", file=sys.__stderr__, flush=True)
+        print(f"[ISAACLAB] Kit hash:    {kit_git_hash}", file=sys.__stderr__, flush=True)
 
     def _abort_signal_handle_callback(self, signal, frame):
         """Handle the abort/segmentation/kill signals."""