if there's no /etc/bat-hosts, make a symlink pointing to autogenerated tmp file

alfred/Makefile

@@ -12,7 +12,7 @@ include $(TOPDIR)/rules.mk
 #
 PKG_NAME:=alfred
 PKG_VERSION:=2013.3.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_MD5SUM:=018ef6262cdd11e900af31d71a864b13
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz

alfred/files/bat-hosts.lua

@@ -65,7 +65,7 @@ local function publish_bat_hosts()
 end
 
 local function write_bat_hosts(rows)
-  local content = { "### File generated by alfred-mod-bat-hosts\n" }
+  local content = { "### File generated by alfred-bat-hosts\n" }
 
   -- merge the chunks from all nodes, de-escaping newlines
   for _, row in ipairs(rows)  do
@@ -80,6 +80,10 @@ local function write_bat_hosts(rows)
     fd:write(table.concat(content))
     fd:close()
   end
+
+  -- try to make a symlink in /etc pointing to /tmp,
+  -- if it exists, ln will do nothing.
+  os.execute("ln -ns /tmp/bat-hosts /etc/bat-hosts")
 end
 
 local function receive_bat_hosts()