#!/bin/sh
# Prune obsolete Docker layers and old build artifact trees on builder nodes.
set -eu
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
# shellcheck source=/dev/null
. "$ROOT/scripts/lib/common.sh"
load_cluster_env

KEEP_BUILDS="${KEEP_BUILDS:-5}"
BUILDS="${BUILDER_BUILDS_DIR:-/var/www/ac/broadcast/builds}"

log "prune docker build cache + dangling images"
docker builder prune -af 2>/dev/null || true
docker image prune -af 2>/dev/null || true

if [ -d "${BUILDS}" ]; then
  log "prune build dirs under ${BUILDS} (keep newest ${KEEP_BUILDS})"
  # Numeric build IDs only; sort descending, drop oldest beyond KEEP_BUILDS.
  ls -1 "${BUILDS}" 2>/dev/null | awk '/^[0-9]+$/' | sort -rn | tail -n +"$((KEEP_BUILDS + 1))" | while read -r id; do
    log "  remove builds/${id}"
    rm -rf "${BUILDS}/${id}"
  done
fi

docker system df 2>/dev/null || true
df -h / /shared 2>/dev/null || true
log "prune-builder-artifacts_ok $(host_short)"