libs/sys: lazy load iwinfo

diff --git a/libs/sys/luasrc/sys.lua b/libs/sys/luasrc/sys.lua
index c0ee4a1d1b93a97196fbec13f12caedea3bd8130..d1137b76a707804a05304d141234f17abc097ced 100644 (file)
--- a/libs/sys/luasrc/sys.lua
+++ b/libs/sys/luasrc/sys.lua
@@ -30,15 +30,14 @@ local os     = require "os"
 local table  = require "table"
 local nixio  = require "nixio"
 local fs     = require "nixio.fs"
-local iwinfo = require "iwinfo"
 local uci    = require "luci.model.uci"
 
 local luci  = {}
 luci.util   = require "luci.util"
 luci.ip     = require "luci.ip"
 
-local tonumber, ipairs, pairs, pcall, type, next, setmetatable =
-       tonumber, ipairs, pairs, pcall, type, next, setmetatable
+local tonumber, ipairs, pairs, pcall, type, next, setmetatable, require =
+       tonumber, ipairs, pairs, pcall, type, next, setmetatable, require
 
 
 --- LuCI Linux and POSIX system utilities.
@@ -625,6 +624,8 @@ wifi = {}
 -- @param ifname        String containing the interface name
 -- @return              A wrapped iwinfo object instance
 function wifi.getiwinfo(ifname)
+       local iwinfo = require "iwinfo"
+
        if ifname then
                local c = 0
                local u = uci.cursor_state()