Bash script to install packages on Ubuntu with APT PPA repos

ppa_install.sh

#!/usr/bin/env bash
set -e

if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root" 1>&2
  exit 1
fi

declare -A pkg_map
pkg_map["ansible"]="ppa:ansible/ansible"
pkg_map["golang-go"]="ppa:longsleep/golang-backports"


for pkg in "${!pkg_map[@]}"; do
  if dpkg -s $pkg >/dev/null 2>&1; then
    echo "$pkg is already installed."
  else
    apt update
    apt install -y software-properties-common
    apt-add-repository --yes --update ${pkg_map[$key]}
    apt install -y $pkg
  fi
done

exit 0