This listener does set the file and directory permissions during installation. For this purpose, you must apply the nested <additionaldata> element to a pack's <file>, <fileset> or <singlefile>.
An action key to apply
permission.dir | permission.file
A value to the above action key for specifying how to apply the particular action.
If the value begins with "0", it is interpreted an an octal number, otherwise as a decimal number representing the chmod-compatible permission on the appropriate files when the listener is executing during the installation.