Howdy, Section 2.2 of the packaging manual says that the postinst script should be idempotent. Section 3.1.2 of the Policy Manual suggests the following code to remove directories under /usr/local:
rmdir /usr/local/lib/emacs/site-lisp && \ rmdir /usr/local/lib/emacs || \ true This is not idempotent if the system fails (or someone sends a signal) after /usr/local/lib/emacs/site-lisp is removed, but before /usr/local/lib/emacs is. Subsequent invocations will never remove /usr/local/lib/emacs . I think the following is a better solution: rmdir /usr/local/lib/emacs/site-lisp /usr/local/lib/emacs || true If we can't rely on rmdir continuing with the rest of its arguments if the first removal fails, then it seems that the following should be used: rmdir /usr/local/lib/emacs/site-lisp || true rmdir /usr/local/lib/emacs || true Matt
