Rust bump to >= 1.75 affects downstream ros2param test

[christophebedard]

Generated by Generative AI

No response

Operating System:

Ubuntu 24.04

ROS version or commit hash:

Rolling

RMW implementation (if applicable):

rmw_zenoh

RMW Configuration (if applicable):

No response

Client library (if applicable):

No response

'ros2 doctor --report' output

ros2 doctor --report

<COPY OUTPUT HERE>

Steps to reproduce issue

1. Make sure ros2/rmw_zenoh is freshly pulled to include Build against rust >= 1.75 for ROS Lyrical #945
2. Testros2param

Expected behavior

Tests pass

Actual behavior

test_verb_load.TestVerbLoad.test_verb_load_wildcard[rmw_zenoh_cpp] fails:

FAIL: test_verb_load.TestVerbLoad.test_verb_load_wildcard[rmw_zenoh_cpp]
------------------------------------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/christophe.bedard/ros/ros2_ws/src/ros2/ros2cli/ros2param/test/test_verb_load.py", line 368, in test_verb_load_wildcard
    loaded_params = yaml.safe_load(param_dump_command.output)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 125, in safe_load
    return load(stream, SafeLoader)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 79, in load
    loader = Loader(stream)
             ^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/yaml/loader.py", line 34, in __init__
    Reader.__init__(self, stream)
  File "/usr/lib/python3/dist-packages/yaml/reader.py", line 74, in __init__
    self.check_printable(stream)
  File "/usr/lib/python3/dist-packages/yaml/reader.py", line 143, in check_printable
    raise ReaderError(self.name, position, ord(character),
yaml.reader.ReaderError: unacceptable character #x001b: special characters are not allowed
  in "<unicode string>", position 476

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/christophe.bedard/ros/ros2_ws/src/ros2/ros2cli/ros2param/test/test_verb_load.py", line 373, in test_verb_load_wildcard
    self.fail(f'Failed to parse YAML output: {e}')
AssertionError: Failed to parse YAML output: unacceptable character #x001b: special characters are not allowed
  in "<unicode string>", position 476

Additional information

I don't see the test failure in the nightlies, but it happened in all Linux CI jobs for #945 (see #945 (comment)) yesterday before it was merged ~11 hours ago. The Rust bump may have included a logging behaviour change that makes an ANSI color escape code (\x1b = ESC character) leak from Zenoh's Rust logging into the captured command output.

[sloretz]

Seems like it might be these log messages:

[ros2param-load-cli-4] �[2m2026-04-06T16:02:59.904849Z�[0m �[31mERROR�[0m ThreadId(10) �[2mzenoh::api::admin�[0m�[2m:�[0m Unable to publish transport event: session closed
[ros2param-load-cli-4] �[2m2026-04-06T16:02:59.905789Z�[0m �[31mERROR�[0m ThreadId(10) �[2mzenoh::api::admin�[0m�[2m:�[0m Unable to publish transport event: session closed
[ros2param-load-cli-4] �[2m2026-04-06T16:02:59.906518Z�[0m �[31mERROR�[0m ThreadId(10) �[2mzenoh::api::admin�[0m�[2m:�[0m Unable to publish transport event: session closed

Which seems to come from here: https://github.com/eclipse-zenoh/zenoh/blob/1ef59de98922adbe5d53f3746bc909242ed26627/zenoh/src/api/admin.rs#L229