Basically there two types of usual ROS2 environment:
- System:
source /opt/ros/${ROS_DISTRO}/setup.bash - Install:
source install/setup.bash
The first one adds environment variables for packages installed to /opt folder.
The other one is the same as first, but also with packages deployed to install folder of ROS workspace.
Please, note that by default ROS2 gives warning, if you try to build packages after sourcing install folder, or any other case when built packages are already installed. To silence it, we use --allow-overriding trick.
The ROS environment can be checked with the following command:
env | grep ROS