ROS2 - Cannot build examples

edit

I also tried building them in my home folder, does not help (why is my reply limited now ?)

pi@ros-pi:~/ros2_ws$ git clone https://github.com/ros2/examples src/examples -b humble
pi@ros-pi:~/ros2_ws$ colcon build --symlink-install
Starting >>> examples_rclcpp_async_client
Starting >>> examples_rclcpp_cbg_executor
Starting >>> examples_rclcpp_minimal_action_client                                                            
Starting >>> examples_rclcpp_minimal_action_server
--- stderr: examples_rclcpp_minimal_action_server                                                                             
CMake Error at CMakeLists.txt:14 (find_package):
  By not providing "Findexample_interfaces.cmake" in CMAKE_MODULE_PATH this
...

thanks, I missed that foxy part

but it does not work, also the dir structure looks nothing like the one in the example

pi@ros-pi:~/WORK/ros2_ws$ git clone https://github.com/ros2/examples src/examples -b humble
pi@ros-pi:~/WORK/ros2_ws$ tree
.
??? src
    ??? examples
        ??? CONTRIBUTING.md
        ??? launch_testing
        ?   ??? launch_testing_examples
        ?       ??? CHANGELOG.rst
        ?       ??? launch_testing_examples
        ?       ?   ??? check_msgs_launch_test.py
        ?       ?   ??? check_multiple_nodes_launch_test.py
        ?       ?   ??? check_node_launch_test.py
        ?       ?   ??? hello_world_launch_test.py
        ?       ?   ??? __init__.py
        ?       ?   ??? record_rosbag_launch_test.py
        ?       ?   ??? set_param_launch_test.py
        ?       ??? package.xml
        ?       ??? README.md

here

https://answers.ros.org/question/3316...

it says I have to install a git repo

https://github.com/ros2/example_inter...

where ? how ?

Is there a reason you are not cloning into the SRC folder as instructed in the tutorials? I suggest you delete the entire ROS2_WS folder and start again. Once you try to COLCON BUILD with files in the wrong place, things get messed up,

And in case you think you don't need to source the environment as often as the tutorials tell you to, you do need to. Get in the habit of sourcing. Anything goes wrong, your first thing should be to verify you're sourcing as shown in tutorials.

• the tutorial does not say anything, there is no cd instruction, you just have to guess
• as mentioned, I tried putting the workspace in my home folder
• I also tried launching colcon in the src folder

as I just mentioned, someone had the same issue, and mas missing that git repo but where do I clone it ?

pi@ros-pi:~/ros2_ws$ git clone https://github.com/ros2/examples_interfaces src/examples -b humble
fatal: destination path 'src/examples' already exists and is not an empty directory.

same issue here https://answers.ros.org/question/3273...

There are very extensive and complete examples and tutorials on the ROS.ORG website. https://docs.ros.org/en/humble/Tutorials.html If you haven't gone through those step by step you will have a very long and frustrating ROS2 experience. Do not try to learn ROS2 from github. That is hopeless.

As I suggested before, delete the entire ROS2_WS folder and start again. Clone the examples into the SCR folder and run COLCON BUILD from the ROS2_WS folder. It will not work any other way. And it won't work at all if you're not sourcing the environment.

• I am actually following these very tutorials, hence the title of this post
• I finally managed to make it work, that git repo was indeed missing and nothing is mentioned anywhere about it

I also put links to other people having the same issue