dirname function is no longer in acf-core-0.9.0

dansguardian-model.lua

@@ -3,7 +3,7 @@ module (..., package.seeall)
 
 -- Load libraries
 require("modelfunctions")
---require "posix"
+require("posix")
 require("fs")
 require("format")
 require("validator")
@@ -71,7 +71,7 @@ local validate_general_config = function( config )
 end
 
 local is_valid_filename = function(filename)
-	local dirname = dirname(filename)
+	local dirname = posix.dirname(filename)
 	return validator.is_valid_filename(filename) and string.match(dirname, baseurl) and not string.match(dirname, "%.%.")
 end