Create tracing_supported() util function

tracetools_launch/tracetools_launch/action.py

@@ -14,7 +14,6 @@
 
 """Module for the Trace action."""
 
-import os
 import re
 import subprocess
 from typing import List
@@ -26,6 +25,7 @@ from launch.actions import SetEnvironmentVariable
 from launch.event import Event
 from launch.event_handlers import OnShutdown
 from launch.launch_context import LaunchContext
+from tracetools_trace import tracing_supported
 from tracetools_trace.tools import lttng
 from tracetools_trace.tools import names
 from tracetools_trace.tools import path
@@ -94,7 +94,7 @@ class Trace(Action):
         :param lib_name: the name of the shared library
         :return: the full path if found, `None` otherwise
         """
-        if os.name == 'nt':
+        if not tracing_supported():
             return None
         (exit_code, output) = subprocess.getstatusoutput(f'whereis -b {lib_name}')
         if exit_code != 0:

tracetools_trace/tracetools_trace/tools/__init__.py

@@ -11,3 +11,15 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+"""Module for tracing."""
+
+import sys
+
+
+def tracing_supported() -> bool:
+    """
+    Check if tracing is supported on this platform.
+    It does not mean a tracer is installed.
+    """
+    return sys.platform == 'linux'