post_install() {
    printf "
    \e[33m\e[1mIMPORTANT NOTE:\e[0m
    You should add something like this to your ~/.bashrc file:

      export ROS_DOMAIN_ID=42
      source /opt/ros2/rolling/setup.bash
    
    This quick command will do it for you:
        
      printf \"\\\nexport ROS_DOMAIN_ID=42\\\nsource /opt/ros2/rolling/setup.bash\\\n\" >> ~/.bashrc

    Note 1: If you use zsh, replace '.bash' in the above lines with
    '.zsh' and add the lines to ~/.zshrc .
    
    Note 2: This will slow down terminal startup for a few seconds on
    cold start, and a fraction of a second for terminals that open later.
    If you know a better transparent solution, you are welcome to edit
    this.
    \e[33m\e[1mEND OF IMPORTANT NOTE.\e[0m
    "
}

post_remove() {
    printf "You may want to clean up .bashrc and/or .zshrc."
}