Setting log Debug level works only in code

[ralwing]

Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04...)
• Installation type:
  • official foxy docker image
• Version or commit hash:
• DDS implementation: rmw_fastrtps_cpp
• Client library (if applicable):

Steps to reproduce issue

create a ComposableNode

import launch
from launch_ros.actions import ComposableNodeContainer, Node
from launch_ros.descriptions import ComposableNode

def generate_launch_description():
    container = ComposableNodeContainer(
        name="container",
        namespace="",
        package="rclcpp_components",
        executable="component_container",
        composable_node_descriptions=[

            ComposableNode(
                package="localization",
                plugin="LocalizationNode",
                name="localization"
            )
        ],
        arguments=['--ros-args', '--log-level', 'DEBUG'] 
    )

    return launch.LaunchDescription([container])

Expected behavior

The log level is set to debug

Actual behavior

The log level doesn't change

Additional information

There are some topics related to this on answers.ros.org:
https://answers.ros.org/question/311471/selecting-log-level-in-ros2-launch-file/
https://answers.ros.org/question/370288/ros2-how-do-you-set-verbosity-of-a-composable-node/#370389

#383

Setting log level to at least info works fine, setting log level in source code also works:

rcutils_ret_t rcutils_logging_set_logger_level (const char *name, int level);

---

Feature request

Allow setting Debug severity log.

[fujitatomoya]

Setting log level to at least info works fine

i do not think so, this is default level so it just seems to work.
we can check that with arguments=['--ros-args', '--log-level', 'WARN'], this should not print any [INFO] messages.

as far as i can see from the source code, ComposableNodeContainer(Node).arguments are assigned to be user-defined arguments, not ros specific command line flags.

https://github.com/ros2/launch_ros/blob/d1c497878274a4ea6a1c1865fe74e395b961ba1f/launch_ros/launch_ros/actions/node.py#L146-L149

[hidmic]

This may be due to components having their own configuration separate from that of the container (see here). ros2/rclcpp#978 is tracking that limitation, though I haven't got around to do what I said I was going to do then.