gluon-core: nicer indentation of /lib/gluon/upgrade/020-interfaces

package/gluon-core/luasrc/lib/gluon/upgrade/020-interfaces

 #!/usr/bin/lua
 
 local sysconfig = require 'gluon.sysconfig'
-local gluon_util = require 'gluon.util'
+
+-- Are we already set up?
+if sysconfig.lan_ifname or sysconfig.wan_ifname then
+	os.exit(0)
+end
+
+
+local util = require 'gluon.util'
 local platform = require 'gluon.platform'
 
 local uci = require('simple-uci').cursor()
 
 
-if not (sysconfig.lan_ifname or sysconfig.wan_ifname) then
-  local function iface_exists(name)
-    return (gluon_util.exec('ip', 'link', 'show', 'dev', (name:gsub('%..*$', ''))) == 0)
-  end
-
+local function iface_exists(name)
+	return util.exec('ip', 'link', 'show', 'dev', (name:gsub('%..*$', ''))) == 0
+end
 
-  local lan_ifname = uci:get('network', 'lan', 'ifname')
-  local wan_ifname = uci:get('network', 'wan', 'ifname')
 
-  if platform.match('ar71xx', 'generic', {'cpe210', 'cpe510', 'wbs210', 'wbs510', 'nanostation-m', 'nanostation-m-xw', 'unifi-outdoor-plus', 'uap-pro', 'unifiac-pro'}) then
-    lan_ifname, wan_ifname = wan_ifname, lan_ifname
-  end
+local lan_ifname = uci:get('network', 'lan', 'ifname')
+local wan_ifname = uci:get('network', 'wan', 'ifname')
+
+if platform.match('ar71xx', 'generic', {
+	'cpe210',
+	'cpe510',
+	'wbs210',
+	'wbs510',
+	'nanostation-m',
+	'nanostation-m-xw',
+	'unifi-outdoor-plus',
+	'uap-pro',
+	'unifiac-pro',
+}) then
+	lan_ifname, wan_ifname = wan_ifname, lan_ifname
+end
 
-  if wan_ifname and iface_exists(wan_ifname) then
-    sysconfig.wan_ifname = wan_ifname
-    sysconfig.lan_ifname = lan_ifname
-  else
-    sysconfig.wan_ifname = lan_ifname
-  end
+if wan_ifname and iface_exists(wan_ifname) then
+	sysconfig.wan_ifname = wan_ifname
+	sysconfig.lan_ifname = lan_ifname
+else
+	sysconfig.wan_ifname = lan_ifname
+end
 
 
-  uci:delete('network', 'lan')
-  uci:delete('network', 'wan')
+uci:delete('network', 'lan')
+uci:delete('network', 'wan')
 
-  uci:save('network')
-end
+uci:save('network')