user control of log file base names, in ros2 launch (#461)

Signed-off-by: Tanishq Chaudhary <[email protected]>
Co-authored-by: Katherine Scott <[email protected]>

Author: Tanishq30052002

ros2launch/ros2launch/api/api.py

@@ -159,10 +159,14 @@ def launch_a_launch_file(
     if args and args.launch_prefix_filter:
         launch_file_arguments.append(f'launch-prefix-filter:={args.launch_prefix_filter}')
 
+    log_file_name = 'launch'
+    if args and args.log_file_name:
+        log_file_name = args.log_file_name
     launch_service = launch.LaunchService(
         argv=launch_file_arguments,
         noninteractive=noninteractive,
-        debug=debug)
+        debug=debug,
+        log_file_name=log_file_name)
 
     parsed_launch_arguments = parse_launch_arguments(launch_file_arguments)
     # Include the user provided launch file using IncludeLaunchDescription so that the

ros2launch/ros2launch/command/launch.py

@@ -91,6 +91,9 @@ def add_arguments(self, parser, cli_name):
             help=("Show all launched subprocesses' output by overriding their output"
                   ' configuration using the OVERRIDE_LAUNCH_PROCESS_OUTPUT envvar.')
         )
+        parser.add_argument(
+            '-f', '--log-file-name', type=str, default='launch',
+            help='Name of the log file (postfixed with .log automatically if not provided).')
         parser.add_argument(
             '--launch-prefix',
             help='Prefix command, which should go before all executables. '