A BASH script for easy installation of io.js on a Raspberry Pi

install_iorpi.sh

#!/bin/bash
# ---------------------------------------------------------------------------------------
# install_iorpi.sh - A BASH shell script for Easy installation of io.js on a Rasberry Pi
# ---------------------------------------------------------------------------------------

PROGNAME=${0##*/}
VERSION="0.1.1"

clean_up() { # Perform pre-exit housekeeping
  return
}

error_exit() {
  echo -e "${PROGNAME}: ${1:-"Unknown Error"}" >&2
  clean_up
  exit 1
}

graceful_exit() {
  clean_up
  exit
}

signal_exit() { # Handle trapped signals
  case $1 in
    INT)
      error_exit "Program interrupted by user" ;;
    TERM)
      echo -e "\n$PROGNAME: Program terminated" >&2
      graceful_exit ;;
    *)
      error_exit "$PROGNAME: Terminating on unknown signal" ;;
  esac
}

usage() {
  echo -e "Usage: $PROGNAME [-h|--help]"
}

help_message() {
  cat <<- _EOF_
  $PROGNAME ver. $VERSION
  Easy installation of io.js on a Rasberry Pi

  $(usage)

  Options:
  -h, --help  Display this help message and exit.

  NOTE: You must be the superuser to run this script.

_EOF_
  return
}

# Trap signals
trap "signal_exit TERM" TERM HUP
trap "signal_exit INT"  INT

# Check for root UID
if [[ $(id -u) != 0 ]]; then
  error_exit "You must be the superuser to run this script."
fi

# Parse command-line
while [[ -n $1 ]]; do
  case $1 in
    -h | --help)
      help_message; graceful_exit ;;
    -* | --*)
      usage
      error_exit "Unknown option $1" ;;
    *)
      echo "Argument $1 to process..." ;;
  esac
  shift
done

# Main logic

read -p "$(printf '\n\n**************************************************\n\nEasy Install of io.js on Raspberry Pi.\n\nCAUTION: This script will upgrade your Debian Release from Wheezy to Jessie.\n\n** PROCEED AT YOUR OWN RISK. **\n\nAre you sure you want to continue? \n\n**************************************[yes/no]**** ')" prompt
if ! [[ $prompt =~ [yY](es)* ]]
then
  exit 0
else

time1=$(date +"%s")
now=$(date)
printf "Starting at $now\n"

printf "Disabled Wheezy in /etc/apt/source.list. Backup at /etc/apt/source.list.old\n\n"
sudo sed -i.old '/ wheezy /s/^/#/' /etc/apt/sources.list

printf "Enabling Debian 'jessie' Release\n\n"
sudo sed -i '1s;^;deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi\n;' /etc/apt/sources.list

printf "Updating and Upgrading System...\n\n"
sudo apt-get -y update && sudo apt-get -y upgrade && sudo apt-get -y autoremove

printf "Installing NVM - Node Version Manager...\n\n"
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.26.1/install.sh | bash

printf "Installing io.js - JavaScript I/O...\n\n"
nvm install iojs

now=$(date)

time2=$(date +"%s")
totaltime=$(($time2-$time1))

printf "Completed at $now\n"
printf "Total Runtime: $(($totaltime / 60)) minutes, $(($totaltime % 60)) seconds.\n"

fi

graceful_exit