+(defun mime-require-safe-directory (dir)
+ "Create a directory DIR safely.
+The permission of the created directory becomes `700' (for the owner only).
+If the directory already exists and is writable by other users, an error
+occurs."
+ (let ((attr (file-attributes dir))
+ (orig-modes (default-file-modes)))
+ (if (and attr (eq (car attr) t)) ; directory already exists.
+ (unless (or (memq system-type '(windows-nt ms-dos OS/2 emx))
+ (and (eq (nth 2 attr) (user-real-uid))
+ (eq (file-modes dir) 448)))
+ (error "Invalid owner or permission for %s" dir))
+ (unwind-protect
+ (progn
+ (set-default-file-modes 448)
+ (make-directory dir))
+ (set-default-file-modes orig-modes)))))
+