<%+header%>
<%
  local jsonc = require "luci.jsonc"
  local uci = require "luci.model.uci".cursor()
  local features = { "_lua_force_array_" }
  local configs = {}
  if luci.sys.call("which ota >/dev/null 2>&1 && ota >/dev/null 2>&1") == 0 then
      features[#features+1] = "ota"
  end
  if luci.sys.call("[ -d /ext_overlay ] >/dev/null 2>&1") == 0 then
      features[#features+1] = "sandbox"
  end
  if luci.sys.call("[ -e /etc/init.d/dockerd ] >/dev/null 2>&1") == 0 then
      features[#features+1] = "docke