Add node install script

bin/install-node-system

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+set -e
+
+NODE_VERSION=${NODE_VERSION:-v12.16.1}
+
+PREFIX_DIR=/usr/local
+BIN_DIR=${PREFIX_DIR}/bin
+
+NODE_PREFIX_DIR=${PREFIX_DIR}/node
+NODE_DEST_DIR=${NODE_PREFIX_DIR}/${NODE_VERSION}
+NODE_DEST_BIN_DIR=${NODE_DEST_DIR}/bin
+NODE_CURRENT=${NODE_PREFIX_DIR}/current
+
+OS=
+if [[ $OSTYPE =~ linux ]]; then
+    OS=linux
+elif [[  $OSTYPE =~ darwin ]]; then
+    OS=darwin
+else
+    echo unknown os: $OSTYPE
+    exit 1
+fi
+
+ARCH=
+if [[ $(uname -m) == x86_64 ]]; then
+    ARCH=x64
+else
+    echo arch not yet supported: $(uname -m)
+    exit 1
+fi
+
+[[ -d ${NODE_DEST_DIR} ]] || sudo mkdir -p ${NODE_DEST_DIR}
+
+TMP_DIR=
+if [[ ! -d ${NODE_DEST_BIN_DIR} ]]; then
+    TMP_DIR=$(mktemp --directory)
+    DEST_FILE=$TMP_DIR/node.tar.xz
+    URL=https://nodejs.org/dist/${NODE_VERSION}/node-${NODE_VERSION}-${OS}-${ARCH}.tar.xz
+    echo downloading node $NODE_VERSION to temp directory ${TMP_DIR}
+    curl --silent --output ${DEST_FILE} ${URL}
+
+    sudo tar xf ${DEST_FILE} --directory ${NODE_DEST_DIR} --strip-components 1
+    sudo chown --recursive root:root ${NODE_DEST_DIR}
+else
+    echo node $NODE_VERSION already installed
+fi
+
+cd ${NODE_PREFIX_DIR}
+sudo unlink current
+sudo ln --symbolic ${NODE_VERSION} current
+echo current version set to ${NODE_VERSION}
+cd ${BIN_DIR}
+for bin in $(ls ${NODE_CURRENT}/bin); do
+    [[ -s $bin ]] || sudo ln --symbolic ${NODE_CURRENT}/bin/$bin
+done
+
+if [[ $TMP_DIR != "" ]]; then
+    rm -rf ${TMP_DIR}
+    echo removed up temp directory ${TMP_DIR}
+fi