NECST installation script for non-docker environment (never tested)

install.sh

function get_ros2_workspace() {
    # Look up environment variables.
    # If the value isn't actually a directory, this will create it.
    candidate=($ROS2_WS $ROS_WS)
    for __value in $candidate; do
        if [ ! -z $__value ]; then
            echo $__value
            [ ! -d $__value ] && mkdir -p $__value
            return 0
        fi
    done

    # Infer common names (ensuring it's not a ROS 1 workspace).
    candidate=($HOME/ros2_ws $HOME/ros2 $HOME/ros_ws $HOME/ros $HOME/ros1 $HOME/catkin_ws)
    for __path in $candidate; do
        if [ -d $__path ] && [ ! -d $__path/devel ]; then
            echo $__path
            return 0
        fi
    done

    # Fallback.
    echo $HOME/ros2_ws
    mkdir $HOME/ros2_ws
    return 0
}

function get_shell_name() {
    echo $(basename $SHELL)
}

function check_required_commands() {
    ret=0
    for __cmd in $@; do
        if [ ! $(command -v $__cmd) ]; then
            echo "Required command '$__cmd' not found"
            ret=1
        fi
    done
    return $ret
}

function write_rc_file() {
    rc_file_path=$HOME/.${__shell}rc
    if ! grep -q "$*" $rc_file_path; then
        echo -e "$*" >> $rc_file_path
    fi
}

. /opt/ros/$ROS_DISTRO/setup.$__shell 2>/dev/null || :
__required=(colcon git)
[ $(check_required_commands $__required) ] || exit 1
__shell=${$(get_shell_name):-bash}  # Fallback is bash.

WORKSPACE=$(get_ros2_workspace)
[ ! -d $WORKSPACE/src ] && mkdir $WORKSPACE/src

git clone https://github.com/necst-telescope/necst.git $WORKSPACE/src/necst
git clone https://github.com/necst-telescope/necst-msgs.git $WORKSPACE/src/necst-msgs

( cd $WORKSPACE && colcon build --symlink-install )
. $WORKSPACE/install/setup.$__shell

if [ $(id -g) = 0 ] && __apt_command="apt-get" || __apt_command="sudo apt-get"
$__apt_command update
$__apt_command -y install rmw_cyclonedds_cpp

write_rc_file ". /opt/ros/$ROS_DISTRO/setup.$__shell"
write_rc_file ". $WORKSPACE/install/setup.$__shell"
write_rc_file "export RMW_IMPLEMENTATION=rmw_cyclonedds_cpp"