_prerequisites.ubuntu.sh

#!/bin/bash
set -euxo pipefail

if [[ -x "$(command -v zfs)" ]] && [[ -x "$(command -v docker)" ]]; then
  echo "Docker and ZFS are installed – assume that secondary tools (such as jq or curl) are installed too."
else
  # Install dependencies
  sudo apt-get update && sudo apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common \
    jq

  # Install Docker
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

  sudo add-apt-repository \
    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) \
    stable"

  sudo apt-get install -y \
    docker-ce \
    docker-ce-cli \
    containerd.io

  # Install ZFS
  sudo apt-get install -y \
    zfsutils-linux

  # Install psql
  sudo apt-get install -y \
    postgresql-client

  # Install yq
  if ! command -v yq &> /dev/null; then
    sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64 && \
    sudo add-apt-repository ppa:rmescandon/yq && \
    sudo apt-get update && sudo apt-get install yq -y
  fi
fi