sensor_diagnostics: Docker build fails — missing ROS2MedkitCompat.cmake

[victorsolaz]

Which demo

sensor_diagnostics

Steps to reproduce

1. Clone the repository
2. Run cd demos/sensor_diagnostics && bash run-demo.sh
3. Docker build fails during colcon build at the ros2_medkit_serialization package

Expected behavior

The Docker image builds successfully and the demo launches.

Actual behavior

The build fails because ros2_medkit_serialization (and potentially other packages) cannot find the ROS2MedkitCompat CMake module. The error occurs during the CMake configure step:

CMake Error at CMakeLists.txt (include):
  include could not find requested file:
    ROS2MedkitCompat

Root cause

The Dockerfile clones ros2_medkit, extracts individual packages from ros2_medkit/src/ into ${COLCON_WS}/src/, and then deletes the entire clone with rm -rf ros2_medkit. However, ros2_medkit/cmake/ROS2MedkitCompat.cmake — a shared CMake module referenced by multiple packages via ../../cmake relative paths — is not preserved before deletion.

Proposed fix

Add a line to preserve the CMake module before removing the clone:

 RUN git clone --depth 1 https://github.com/selfpatch/ros2_medkit.git && \
     mv ros2_medkit/src/ros2_medkit_gateway . && \
     mv ros2_medkit/src/ros2_medkit_serialization . && \
     mv ros2_medkit/src/ros2_medkit_msgs . && \
     mv ros2_medkit/src/ros2_medkit_fault_manager . && \
     mv ros2_medkit/src/ros2_medkit_fault_reporter . && \
     mv ros2_medkit/src/ros2_medkit_diagnostic_bridge . && \
+    mkdir -p ${COLCON_WS}/cmake && mv ros2_medkit/cmake/ROS2MedkitCompat.cmake ${COLCON_WS}/cmake/ && \
     rm -rf ros2_medkit

This places ROS2MedkitCompat.cmake at ${COLCON_WS}/cmake/, which is exactly where the relative ../../cmake paths from packages in ${COLCON_WS}/src/<pkg>/ resolve to. The fix has been tested locally and the demo builds and runs correctly.

Environment

• ROS 2 distro: Jazzy
• OS: Ubuntu 24.04 on WSL 2
• ros2_medkit version: latest (HEAD of main)