start_container.bash

if [ -z "$1" ]; then
    export user_count=0
else 
    export user_count=$(expr $1 - 1)
fi

if [ -z "$2" ]; then
    export ssh_first_port=60000
else 
    export ssh_first_port=$2
fi

export ros_domain_id=24
export base_name=dev_ws_container


for i in $( seq 0 $user_count ); do
    export ssh_port=$(expr $ssh_first_port + $i)
    if [ -z "$(docker ps | grep $ssh_port)" ]; then
        docker run -v $PWD/install:/devs_ws/install -e TURTLE_NAME=turtle$i -e ROS_DOMAIN_ID=$ros_domain_id --name $base_name$ssh_port -d -p $ssh_port:22 devs_ws:copy_fs #> /dev/null 2>&1

        # Environment variables set through docker run's -e flag are stored in
        # memory and do not persist. Writing to the ./bashrc allows ssh to
        # access them.
        docker exec $base_name$ssh_port bash -c "echo 'export TURTLE_NAME=turtle$i' >> ~/.bashrc"
        docker exec $base_name$ssh_port bash -c "echo 'export ROS_DOMAIN_ID=$ros_domain_id' >> ~/.bashrc"

        echo container $base_name$ssh_port now starting
    else 
        echo Port $ssh_port occupied - container $base_name$ssh_port could already be running 
    fi
done