portainer_install () {

    local target
    local dir="$(dirname $(realpath "${BASH_SOURCE:-$0}"))"
    target=${1:-/opt/portainer}
    [[ -d $target ]] || mkdir -p $target
    echo installing portainer to $target
    if /bin/cp -f $dir/portainer/*  $target; then
    pushd $target || return
    echo PORTAINER_DIR=$target >> .env
    source .env
    mkdir -p ${DATA:-$target/data}
    ./config
     ./start 
    sleep 5
    ./logs
    else 
    echo unable to copy portainer files to $target, install aborted
    fi
    popd || return
}

# if script was executed then call the function
(return 0 2>/dev/null) || portainer_install $@