While working on the ROS2 Basics in 5 Days Course (C++), for section 4.8, I created executor_example_5.cpp, modified the CMakeLists.txt as instructed, then went to build the project. The build took 6 minutes to get to 50%, and then didn’t seem to progress.
I decided to delete the /build and /install directories in ros2_ws to try a clean install. Now, nothing seems to build.
I have downloaded/backed up all my packages already. Is it posible to revert this workspace to the default state, or revert it to how it was a day or two ago, so I can try again?