#!/usr/bin/env bash
# Free disk before docker compose build (build cache is the usual culprit for Go OOM / no space).
# Safe on deploy hosts: does NOT use --volumes (keeps named DB volumes).
set -euo pipefail

docker_cmd() {
  if docker info >/dev/null 2>&1; then
    docker "$@"
  elif sudo docker info >/dev/null 2>&1; then
    sudo docker "$@"
  else
    echo "docker not available — skip prune" >&2
    return 1
  fi
}

echo "==> disk before prune"
df -h / 2>/dev/null || true
if [[ -d /var/lib/docker ]]; then
  df -h /var/lib/docker 2>/dev/null || true
fi

if ! docker info >/dev/null 2>&1 && ! sudo docker info >/dev/null 2>&1; then
  echo "docker not available — skip prune" >&2
  exit 0
fi

echo "==> docker builder prune (build cache)"
docker_cmd builder prune -af || true

echo "==> docker system prune (unused images, stopped containers, networks)"
docker_cmd system prune -af || true

echo "==> disk after prune"
df -h / 2>/dev/null || true
if [[ -d /var/lib/docker ]]; then
  df -h /var/lib/docker 2>/dev/null || true
fi