Stefan, I've found you added tla--archive-mirrorp. I wrote rather similar functions in xtla-core.el.
(defun tla--archive-type (archive) "Return the type of archive." (cond ((string-match "SOURCE$" archive) 'source) ((string-match "MIRROR$" archive) 'mirror) (t 'normal))) Please look at. Symbol names for mirror releated functions are not sophisticated. We may need more strong naming rule. It is difficult to know whether what I want is already in xtla or not. It is worth to split xtla.el into some smaller files. e.g. xtla-mirror.el.
