:farmer: ros2cli_daemon tests failing in win rel because it can't spawn daemons

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Operating System:

Windows 11

ROS version or commit hash:

Rolling

RMW implementation (if applicable):

No response

RMW Configuration (if applicable):

No response

Client library (if applicable):

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'ros2 doctor --report' output

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Steps to reproduce issue

1. Go to https://ci.ros2.org/job/nightly_win_rel
2. Build a job
3. See test failing

Expected behavior

Build without test regressions

Actual behavior

Building with lots of test regressions because assert spawn_daemon() isn't spawning the daemon

Additional information

Reference Builds

• nightly_win_rel#3794

Failing tests

ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_name
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_namespace
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_node_names_and_namespaces
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_node_names_and_namespaces_with_enclaves
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_topic_names_and_types
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_service_names_and_types
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_action_names_and_types
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_publisher_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_subscriber_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_service_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_client_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_action_server_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_action_client_names_and_types_by_node
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_publishers_info_by_topic
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_subscriptions_info_by_topic
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_clients_info_by_service
ros2cli.ros2cli.test.test_ros2cli_daemon.test_get_servers_info_by_service
ros2cli.ros2cli.test.test_ros2cli_daemon.test_count_publishers
ros2cli.ros2cli.test.test_ros2cli_daemon.test_count_subscribers
ros2cli.ros2cli.test.test_ros2cli_daemon.test_count_clients
ros2cli.ros2cli.test.test_ros2cli_daemon.test_count_services
ros2cli.ros2cli.test.test_strategy.test_with_daemon_running
ros2cli.ros2cli.test.test_strategy.test_with_daemon_spawn
ros2cli.ros2cli.test.test_strategy.test_enforce_no_daemon

Log Output

__________________ ERROR at setup of test_count_subscribers ___________________

test\test_ros2cli_daemon.py:134: in daemon_node

    assert spawn_daemon(args=[], timeout=5.0)

E   assert False

E    +  where False = spawn_daemon(args=[], timeout=5.0)

____________________ ERROR at setup of test_count_clients _____________________

test\test_ros2cli_daemon.py:134: in daemon_node

    assert spawn_daemon(args=[], timeout=5.0)

E   assert False

E    +  where False = spawn_daemon(args=[], timeout=5.0)

____________________ ERROR at setup of test_count_services ____________________

test\test_ros2cli_daemon.py:134: in daemon_node

    assert spawn_daemon(args=[], timeout=5.0)

E   assert False

E    +  where False = spawn_daemon(args=[], timeout=5.0)

_________________ ERROR at setup of test_with_daemon_running __________________

test\test_strategy.py:35: in enforce_daemon_is_running

    assert spawn_daemon(args=[], timeout=5.0)

E   assert False

E    +  where False = spawn_daemon(args=[], timeout=5.0)

__________________ ERROR at setup of test_enforce_no_daemon ___________________

test\test_strategy.py:35: in enforce_daemon_is_running

    assert spawn_daemon(args=[], timeout=5.0)

E   assert False

E    +  where False = spawn_daemon(args=[], timeout=5.0)

================================== FAILURES ===================================

___________________________ test_with_daemon_spawn ____________________________

test\test_strategy.py:54: in test_with_daemon_spawn

    assert node._daemon_node is not None

E   assert None is not None

E    +  where None = <ros2cli.node.strategy.NodeStrategy object at 0x0000023BB9ECB320>._daemon_node

Flakyness 15 days

job_name	last_fail	first_fail	build_count	failure_count	failure_percentage
nightly_win_rel	2026-05-11	2026-05-02	4	3	75.0

The first time this error happened was in https://ci.ros2.org/job/nightly_win_rel/3783, comparing repos there is just one change in ros/ros_environment and doesn't seems related

CC: @Crola1702

Start with test/test_ros2cli_daemon.py and test/test_strategy.py, focusing on the spawn_daemon(args=[], timeout=5.0) setup and the daemon-spawn strategy test. Reproduce the failure in the nightly_win_rel job or on Windows, then trace why the daemon is not created. Done means the listed ros2cli daemon and strategy tests pass without regressions on Windows.