delete-file succeeds without deleting the file

[Michael Heerdegen]

Hello,

in my code, I want to use something like this:

--8<---------------cut here---------------start------------->8---
(defmacro foo-save-index (&rest body)
  ;; Modeled after `magit-with-temp-index'
  (declare (debug t))
  (macroexp-let2 nil temp-index-file '(expand-file-name (make-temp-name 
"index.foo"))
    `(unwind-protect
         (let ((process-environment process-environment))
           (setenv "GIT_INDEX_FILE" ,temp-index-file)
           ,@body)
       (when (file-exists-p ,temp-index-file) (delete-file ,temp-index-file)))))
--8<---------------cut here---------------end--------------->8---

This makes it possible to work with a temporary git index while working
with git commands in BODY.  All those commands are synchronous.

This works as expected, but in some, quite rare cases, the temporary
index file survives.  There is no error, and delete-file seems to
terminate always successfully.

Anybody any idea how this can happen?


Thanks,

Michael.