aws-setup.sh

#! /usr/bin/env bash
set -e
set -o nounset # Exit, with error message, when attempting to use an undefined variable.
set -o errexit # Abort script at first error, when a command exits with non-zero status.
set -o pipefail # Returns exit status of the last command in the pipe that returned a non-zero return value.
IFS=$'\n\t' # Defines how Bash splits words and iterates arrays. This defines newlines and tabs as delimiters.

export INSTALL_COMMAND="apt-get -q -y"

output_file="output.log"

# Set the machine's timezone
# Arguments:
#   tz data timezone
function setTimezone() {
    local timezone=${1}
    echo "${1}" | sudo tee /etc/timezone
    sudo ln -fs "/usr/share/zoneinfo/${timezone}" /etc/localtime # https://bugs.launchpad.net/ubuntu/+source/tzdata/+bug/1554806
    sudo dpkg-reconfigure -f noninteractive tzdata
}

# Gets the amount of physical memory in GB (rounded up) installed on the machine
function getPhysicalMemory() {
    local phymem
    phymem="$(free -g|awk '/^Mem:/{print $2}')"

    if [[ ${phymem} == '0' ]]; then
        echo 1
    else
        echo "${phymem}"
    fi
}

function setupTimezone() {
    echo -ne "Enter the timezone for the server (Default is 'Asia/Kolkata'):\n" >&3
    read -r timezone
    if [ -z "${timezone}" ]; then
        timezone="Asia/Kolkata"
    fi
    setTimezone "${timezone}"
    echo "Timezone is set to $(cat /etc/timezone)" >&3
}

function installPackages() {
    # EXECUTION
    # Initialization
    $INSTALL_COMMAND update
    $INSTALL_COMMAND upgrade

    # Build Tools
    $INSTALL_COMMAND install build-essential # Essential for compiling source (includes GCC compiler, etc).
    $INSTALL_COMMAND install libreadline6 libreadline6-dev # CLI.
    $INSTALL_COMMAND install zlib1g zlib1g-dev # Compression.
    $INSTALL_COMMAND install libssl-dev # SSL.
    $INSTALL_COMMAND install libpcre3 libpcre3-dev # Regular Expressions.
    $INSTALL_COMMAND install libyaml-dev # YAML.
    $INSTALL_COMMAND install libxml2-dev # XML.
    $INSTALL_COMMAND install libxslt-dev # XSLT.

    # Package Management
    $INSTALL_COMMAND install python-software-properties # Provides the "add-apt-repository" command.

    # Git
    $INSTALL_COMMAND install git-core

    # Java
    $INSTALL_COMMAND install default-jdk default-jre

    # Docker
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
    add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
    $INSTALL_COMMAND install docker-ce docker-compose
    usermod -aG docker ${USER}
}

function main() {
    setupTimezone
    installPackages
}