#!/usr/bin/env bash
set -euo pipefail

marker="/host/var/lib/atlas-maintenance/titan-24-docker.ready"
host_sh() {
  chroot /host /bin/sh -c "$*"
}

host_systemctl() {
  chroot /host /usr/bin/nsenter -t 1 -m -u -i -n -p /bin/systemctl "$@"
}

install_docker() {
  host_sh "apt-get update"
  host_sh "DEBIAN_FRONTEND=noninteractive apt-get install -y ca-certificates curl gnupg"
  host_sh "install -m 0755 -d /etc/apt/keyrings"
  host_sh "curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc"
  host_sh "chmod a+r /etc/apt/keyrings/docker.asc"
  host_sh '. /etc/os-release; codename="${VERSION_CODENAME:-trixie}"; echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian ${codename} stable" > /etc/apt/sources.list.d/docker.list'
  host_sh "apt-get update"
  host_sh "DEBIAN_FRONTEND=noninteractive apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin"
}

configure_docker() {
  mkdir -p /host/etc/docker
  if [ ! -f /host/etc/docker/daemon.json ]; then
    cat >/host/etc/docker/daemon.json <<'JSON'
{
  "log-driver": "local",
  "log-opts": {
    "max-size": "50m",
    "max-file": "3"
  }
}
JSON
  fi
  host_systemctl daemon-reload
  host_systemctl enable --now docker
}

if [ ! -x /host/usr/bin/docker ] || ! host_sh "docker version >/dev/null 2>&1"; then
  install_docker
fi

configure_docker

mkdir -p "$(dirname "${marker}")"
date -Is >"${marker}"

while true; do
  if [ ! -S /host/var/run/docker.sock ]; then
    configure_docker
  fi
  sleep 300
done