gluon-core: add default_hostname helper

package/gluon-core/luasrc/lib/gluon/upgrade/030-system

@@ -15,7 +15,7 @@ local pretty_hostname = require 'pretty_hostname'
 
 local system = uci:get_first('system', 'system')
 
-pretty_hostname.set(uci, site.hostname_prefix('') .. util.node_id())
+pretty_hostname.set(uci, util.default_hostname())
 uci:set('system', system, 'timezone', site.timezone())
 
 uci:save('system')

package/gluon-core/luasrc/usr/lib/lua/gluon/util.lua

@@ -95,6 +95,10 @@ function node_id()
 	return string.gsub(sysconfig.primary_mac, ':', '')
 end
 
+function default_hostname()
+	return site.hostname_prefix('') .. node_id()
+end
+
 function domain_seed_bytes(key, length)
 	local ret = ''
 	local v = ''