(vc-mode-line): Warn if file is not vc-registered

but is a symlink to a vc-maintained file.

1 files changed, 6 insertions, 0 deletions

diff --git a/lisp/vc-hooks.el b/lisp/vc-hooks.el
index 6e1878ada02..48e3ea6424d 100644
--- a/lisp/vc-hooks.el
+++ b/lisp/vc-hooks.el
@@ -154,6 +154,12 @@ visiting FILE."
          (require 'vc)
          (not (string-equal (user-login-name) (vc-locking-user file)))
          (setq buffer-read-only t))
+    (and (null vc-type)
+         (file-symlink-p buffer-file-name)
+         (let ((link-type (vc-backend-deduce (file-symlink-p buffer-file-name))))
+           (if link-type
+               (message "Warning: symbolic link to %s-controlled source file"
+                        link-type))))
     (force-mode-line-update)
     ;;(set-buffer-modified-p (buffer-modified-p))  ;;use this if Emacs 18
     vc-type))