set -e
shopt -s nullglob
KEEP=5
# glob 字符类只匹配严格的 backup-YYYYMMDD-HHMMSS；nullglob 让无匹配时展开为空数组。
# glob 结果按字典序排列，对该命名格式而言等价于时间戳升序（最早的在前）。
rollbacks=()
for p in /data/pms/backup-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]; do
    if [ -d "$p" ]; then
        rollbacks+=( "$p" )
    fi
done
total=${#rollbacks[@]}
echo "  当前回滚点 $total 个（deploy 会为每次部署新建一份）:"
for p in "${rollbacks[@]}"; do
    echo "    $p"
done
if [ "$total" -gt "$KEEP" ]; then
    drop=$((total - KEEP))
    echo "  将删除最早的 $drop 个（保留最近 $KEEP 个）:"
    i=0
    for p in "${rollbacks[@]}"; do
        if [ "$i" -ge "$drop" ]; then
            break
        fi
        i=$((i + 1))
        # 复核：名字必须严格符合 backup-YYYYMMDD-HHMMSS，否则拒绝删除（绝不碰其它目录）
        case "$(basename "$p")" in
            backup-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9])
                echo "    删除 $p"
                rm -rf -- "$p"
                ;;
            *)
                echo "    [skip] 名字不符合回滚点模式，拒绝删除: $p"
                ;;
        esac
    done
else
    echo "  回滚点数量未超过 $KEEP，无需清理"
fi
kept=()
for p in /data/pms/backup-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]; do
    if [ -d "$p" ]; then
        kept+=( "$p" )
    fi
done
echo "  清理后保留的回滚点 ${#kept[@]} 个:"
for p in "${kept[@]}"; do
    echo "    $p"
done
echo "  /data/pms 占用: $(du -sh /data/pms | cut -f1)"