#!/usr/bin/env bash
# One-time host setup: installs Docker Engine + the compose plugin from
# Docker's own apt repository.
#
# Separate from dev-env.sh on purpose - this touches the machine (apt, a new
# apt source, a usermod), dev-env.sh only touches containers. Run this once,
# then use dev-env.sh for everything else.
#
# Ubuntu-specific, and written for this workspace's WSL2 environment where
# PID 1 is not systemd: nothing here enables a service, because there is no
# service manager to enable it with. dev-env.sh starts dockerd itself.
set -euo pipefail

if command -v docker >/dev/null 2>&1; then
  echo "docker is already installed: $(docker --version)"
  exit 0
fi

. /etc/os-release
echo "==> installing Docker Engine for ${ID} ${VERSION_CODENAME}"

sudo apt-get update -qq
sudo apt-get install -y -qq ca-certificates curl gnupg iptables

sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL "https://download.docker.com/linux/${ID}/gpg" \
  | sudo gpg --dearmor --yes -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
https://download.docker.com/linux/${ID} ${VERSION_CODENAME} stable" \
  | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update -qq
sudo apt-get install -y -qq docker-ce docker-ce-cli containerd.io docker-compose-plugin

# So dev-env.sh can talk to the daemon without sudo. Needs a fresh login to
# take effect, which is why dev-env.sh also falls back to sudo.
sudo usermod -aG docker "$USER" || true

echo "==> installed: $(docker --version)"
echo "==> $(docker compose version)"
echo
echo "Next: scripts/dev-env.sh up"