#!/bin/bash

# Usage: ./setup_nodeJs.sh [version]

# If version is not provided, installs the latest LTS version of Node.js.

# If a different version is already installed in /opt, it will be removed and replaced.

# Log file location

LOG_FILE="/var/log/node_install.log"

# Create or clear the log file

echo "Node.js Installation Log - $(date)" > $LOG_FILE

echo "-----------------------------------" >> $LOG_FILE

set -o pipefail

# If installed before, remove the old system packages with the available package manager

if command -v apt-get >/dev/null 2>&1; then

apt-get purge -y nodejs npm

elif command -v dnf >/dev/null 2>&1; then

dnf remove -y nodejs npm

elif command -v yum >/dev/null 2>&1; then

yum remove -y nodejs npm

else

echo "Warning: No supported package manager found for removing system Node.js packages."

fi

# Parse command-line arguments for version

if [ $# -gt 0 ]; then

NODE_VERSION="$1"

# Check if it's a major version number (e.g., "20")

if [[ "$NODE_VERSION" =~ ^[0-9]+$ ]]; then

# Find the latest version in this major series

NODE_VERSION=$(curl -s https://nodejs.org/dist/index.json | jq -r "[.[] | select(.version | startswith(\"v${NODE_VERSION}.\"))][0].version" 2>/dev/null)

if [ -z "$NODE_VERSION" ] || [ "$NODE_VERSION" = "null" ]; then

echo "Error: No versions found for major version $1" | tee -a $LOG_FILE

exit 1

fi

echo "Using latest Node.js version in $1.x series: ${NODE_VERSION}" | tee -a $LOG_FILE

else

echo "Using specified Node.js version: ${NODE_VERSION}" | tee -a $LOG_FILE

fi

else

# Try to detect the latest Node.js LTS version from the official index.json

DEFAULT_NODE_VERSION="v22.11.0"

NODE_VERSION=$(curl -s https://nodejs.org/dist/index.json | jq -r '[.[] | select(.lts != false)][0].version' 2>/dev/null || echo "$DEFAULT_NODE_VERSION")

if [ -z "$NODE_VERSION" ]; then

NODE_VERSION="$DEFAULT_NODE_VERSION"

fi

echo "Using latest LTS Node.js version: ${NODE_VERSION}" | tee -a $LOG_FILE

fi

INSTALL_DIR="/opt"

BIN_DIR="/usr/local/bin"

# Detect system architecture and adapt Node binary suffix

ARCH=$(uname -m)

case "$ARCH" in

x86_64|amd64)

NODE_ARCH="x64";

;;

aarch64|arm64)

NODE_ARCH="arm64";

;;

armv7l|armhf)

NODE_ARCH="armv7l";

;;

*)

NODE_ARCH="x64";

echo "Warning: Unknown architecture $ARCH, falling back to x64" | tee -a $LOG_FILE

;;

esac

# Rebuild distro name and URL with architecture

NODE_DISTRO="node-${NODE_VERSION}-linux-${NODE_ARCH}"

NODE_TAR="${NODE_DISTRO}.tar.xz"

NODE_URL="https://nodejs.org/dist/${NODE_VERSION}/${NODE_TAR}"

echo "Detected architecture: $ARCH -> using $NODE_ARCH" | tee -a $LOG_FILE

# Check for existing Node.js installation in /opt

EXISTING_NODE_DIR=$(ls /opt 2>/dev/null | grep '^node-' | head -n1)

if [ -n "$EXISTING_NODE_DIR" ]; then

EXISTING_VERSION=$(echo "$EXISTING_NODE_DIR" | sed -E 's/node-(v[0-9]+\.[0-9]+\.[0-9]+)-.*/\1/')

if [ "$EXISTING_VERSION" != "$NODE_VERSION" ]; then

echo "Removing old Node.js version $EXISTING_VERSION from /opt..." | tee -a $LOG_FILE

sudo rm -rf "/opt/$EXISTING_NODE_DIR"

fi

fi

# Step 1: Download the Node.js tarball

echo "Downloading Node.js LTS version ${NODE_VERSION}..." | tee -a $LOG_FILE

echo "Extracting Node.js to $INSTALL_DIR..." | tee -a $LOG_FILE

curl -fsSL "$NODE_URL" | tar -xJf - -C "$INSTALL_DIR"

if [ $? -ne 0 ]; then

echo "Error: Failed to download Node.js." | tee -a $LOG_FILE

exit 1

fi

# Step 2: Create symbolic links for node, npm, and npx

echo "Creating symbolic links for Node.js binaries..." | tee -a $LOG_FILE

sudo ln -sf $INSTALL_DIR/$NODE_DISTRO/bin/node $BIN_DIR/node

sudo ln -sf $INSTALL_DIR/$NODE_DISTRO/bin/npm $BIN_DIR/npm

sudo ln -sf $INSTALL_DIR/$NODE_DISTRO/bin/npx $BIN_DIR/npx

sudo ln -sf $INSTALL_DIR/$NODE_DISTRO/bin/node $BIN_DIR/nodejs

if [ $? -ne 0 ]; then

echo "Error: Failed to create symbolic links." | tee -a $LOG_FILE

exit 1

fi

# Step 3: Test if the binaries are callable and log the result

echo "Testing Node.js, npm, npx, and nodejs..." | tee -a $LOG_FILE

NODE_VERSION_TEST=$(node -v)

NPM_VERSION_TEST=$(npm -v)

NPX_VERSION_TEST=$(npx -v)

NODEJS_VERSION_TEST=$(nodejs -v)

if [ $? -eq 0 ]; then

echo "Node.js version: $NODE_VERSION_TEST" | tee -a $LOG_FILE

echo "npm version: $NPM_VERSION_TEST" | tee -a $LOG_FILE

echo "npx version: $NPX_VERSION_TEST" | tee -a $LOG_FILE

echo "nodejs version: $NODEJS_VERSION_TEST" | tee -a $LOG_FILE

else

echo "Error: One or more binaries are not callable." | tee -a $LOG_FILE

exit 1

fi

echo "Node.js installation completed successfully." | tee -a $LOG_FILE