Docker & Docker-Compose installation and configuration shell script

docker.sh

# Utils
prompt_yn() {
  def=$2

  case $def in
    [yY]) def="y"; read -r -p "${1} [Y/n] " input;;
    [nN]) def="n"; read -r -p "${1} [y/N] " input;;
  esac

  case $input in
    "")
      if [ $def = "y" ]; then
	echo 1
      else
	echo 0
      fi
    ;;
    [yY][eE][sS]|[yY]) echo 1;;
    [nN][oO]|[nN]|*) echo 0;;
  esac
}

get_latest_release() {
  curl --silent "https://api.github.com/repos/$1/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/'
}

# Docker
yes y | pacman -S docker
sudo usermod -aG docker $(logname)
sudo systemctl enable docker
sudo systemctl start docker

# Docker-Compose
REPO="docker/compose"
COMPOSE_VER=$(get_latest_release $REPO)

sudo curl -L "https://github.com/${REPO}/releases/download/${COMPOSEVER}/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

yn=$(prompt_yn "You need to reboot your system in order to apply docker settings. Reboot now?" "n")

if [ $yn == 1 ]; then
  sudo reboot
fi