set up isolated node env

getnode.sh

#!/bin/bash
#===============================================================================
#title           : node_env.sh
#description     : This script will generate an isolated Node.js environment
#date            : 20180912
#version         : 0.1
#usage           : bash node_env.sh
#notes           : Edit user settings before running if needed
#bash_version    : 4.3.48(1)-release
## REQUIREMENS:
##  7zip on Windows ( https://www.7-zip.org/ )
##  wget on all platforms ( https://www.gnu.org/software/wget/)
##  jq on all platforms ( https://stedolan.github.io/jq/ )
#===============================================================================
## latest node can be found by looking at:
##  https://nodejs.org/dist/index.json

## =============================================================================
## =============================================================================
## USER SETTINGS
## =============================================================================

NODE_DIST=https://nodejs.org/dist/
NODE_PATH=$PWD/node

## =============================================================================
## DO NOT EDIT BELOW THIS
## =============================================================================
## =============================================================================

red="\033[0;31m"
green="\033[0;32m"
yellow="\033[0;33m"
blue="\033[0;34m"
white="\033[1;37m"
TOA="\033[0m" # No Color

function logStd () {
    echo -e "${white}$1${TOA}" 1>&2
}

function logError () {
    echo -e "${red}$1${TOA}" 1>&2
}
function logWarn () {
    echo -e "${yellow}$1${TOA}" 1>&2
}

function logInfo () {
    echo -e "${green}$1${TOA}" 1>&2
}

function logDebug () {
    echo -e "${blue}$1${TOA}" 1>&2
}

function logBanner(){
	logInfo "============================================================================="
	logStd  "= ${1}"
	logInfo "============================================================================="
}


NODE_ARCH=$(uname -m)
NODE_ARCH=${NODE_ARCH/86_}
NODE_OS=$OSTYPE

if [[ $OSTYPE = *"msys"* ]]; then
  NODE_OS='win'
fi

if [[ $OSTYPE = *"cygwin"* ]]; then
  NODE_OS='win'
fi

if [[ $OSTYPE = *"win32"* ]]; then
  NODE_OS='win'
fi

if [[ $OSTYPE = *"linux"* ]]; then
  NODE_OS='linux'
fi

if [[ $OSTYPE = *"darwin"* ]]; then
  NODE_OS='darwin'
fi

depends="true"

logBanner "Beginning Node js install on ${NODE_OS}"

if [[ $NODE_OS = "win"  ]]; then

  hash 7z 2>/dev/null
  if [[ $? -ne 0 ]]; then
    logError 'Error: 7z is not installed.'
    logInfo 'You can download the command line version of 7Zip from https://www.7-zip.org/download.html'
    depends="false"
  fi

else
  hash jq 2>/dev/null
  if [[ $? -ne 0 ]]; then
    logError 'Error: jq is not installed.'
    logInfo 'You can download the command line version of jq from https://stedolan.github.io/jq'
    depends="false"
  else
    jq_ver=$(jq --version | cut -d'-' -f 2)
    requiredver="1.5"
     if [ "$(printf '%s\n' "$requiredver" "$jq_ver" | sort -V | head -n1)" = "$requiredver" ]; then
            echo "jq meets version requirements for this script"
     else
            echo "jq must be version $requiredver or greater to work with this script"
            depends="false"
     fi
  fi
  hash wget 2>/dev/null
  if [[ $? -ne 0 ]]; then
    logError 'Error: wget is not installed.'
    if [[ $NODE_OS = "win"  ]]; then
      logInfo 'You can download the command line version of wget from http://gnuwin32.sourceforge.net/packages/wget.htm'
    else
      logInfo 'You should install wget using your OS package manager of choice..'
    fi
    depends="false"
  fi
fi

if [[ "${depends}" != "true" ]]; then
  logError "THERE ARE MISSIGN DEPENDENCIES!!"
  exit -1
fi

## get node versions available
version_json=$(wget --quiet -O- "https://nodejs.org/dist/index.json")

## override node version from command line
if [[ "$1" != "" ]]; then
  NODE_VER=$1

  logInfo "Looking for node version: [${NODE_VER}]"
  echo ${version_json} | jq -e '.[] | select(.version | contains("'${NODE_VER}'"))' > /dev/null

  if [ $? -eq 0 ]; then
    echo OK
  else
      logError "Error: Node version [${NODE_VER}] could not be found..."
      echo "Availble versions include:"
      echo
      versions=$(echo ${version_json} | jq -e '.[].version')
      echo ${versions}
      exit -1
  fi
else
  ### get latest node version
  version=$(echo ${version_json} | jq -e 'first(.[].version)')
  version="${version%\"}"
  NODE_VER=${version#\"}
  logInfo "Latest node version is : ${NODE_VER}"
fi

set -e

## some settings to help with errors
if [[ $NODE_OS != "win"  ]]; then
  set -o errexit -o nounset -o noclobber -o pipefail
  shopt -s nullglob
  set -e
fi

# support Linux and Windows (MSYS2 bash) environments
## requires tar or 7z  with wget
if [[ $NODE_OS != "win"  ]]; then NODE_PATH="$NODE_PATH/bin"; fi

NPM_CONFIG_ROOT=$PWD/npmrc

## clean up existing installs
rm -f boot_node.sh
rm -rf $PWD/npmrc
rm -rf node

## create download url
if [[ $NODE_OS = "win" ]]; then
  filestr="node-$NODE_VER-$NODE_OS-${NODE_ARCH}.7z"; output="node.7z";
else
  filestr="node-${NODE_VER}-$NODE_OS-${NODE_ARCH}.tar.xz"; output="node.tar.xz";
fi

## download node binary package
wget ${NODE_DIST}${NODE_VER}/${filestr} -O ${output}

## extract to node install dir
if [[ $NODE_OS = "win" ]]; then
  7z x node.7z; mv node-${NODE_VER}-${NODE_OS}-${NODE_ARCH} node; rm node.7z;
else
  tar xvf node.tar.xz; mv node-${NODE_VER}-${NODE_OS}-${NODE_ARCH} node; rm node.tar.xz;
fi

echo '#!/bin/bash' > boot_node.sh
echo export PATH=\"$NODE_PATH:$PWD/node:$PWD/node_modules/.bin:$PWD/npmrc/.npm_global:$PWD/npmrc/.npm_global/bin:$PATH\" >> boot_node.sh
echo export NPM_CONFIG_ROOT=$NPM_CONFIG_ROOT >> boot_node.sh
echo export NPM_CONFIG_USERCONFIG=$NPM_CONFIG_ROOT/.npmrc >> boot_node.sh
echo export NPM_CONFIG_GLOBALCONFIG=$NPM_CONFIG_ROOT/.npmrc >> boot_node.sh
echo export NPM_CONFIG_USERPREFIX=$NPM_CONFIG_ROOT/.npm_user >> boot_node.sh
echo export NPM_CONFIG_PREFIX=$NPM_CONFIG_ROOT/.npm_global >> boot_node.sh
echo export NPM_CONFIG_CACHE=$NPM_CONFIG_ROOT/.npm >> boot_node.sh

source ./boot_node.sh

npm install yarn -g
echo -e '\n\n============================================================================='
echo '============================================================================='
node --version
echo '============================================================================='
which node
which yarn
which npm
echo '============================================================================='

logWarn "\n\n*** PLEASE RUN [ source ./boot_node.sh ] to set up your path and vars for this
env...\n\n"