master f6cafe6: Make dired-toggle-read-only check whether the directory is writable

[Lars Ingebrigtsen]

branch: master
commit f6cafe657402805f21a9651071f9768f92dacc76
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Make dired-toggle-read-only check whether the directory is writable
    
    * lisp/dired.el (dired-toggle-read-only): Check that the directory
    is writable (bug#29412).
---
 lisp/dired.el | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lisp/dired.el b/lisp/dired.el
index 30b9f5b..6ad2497 100644
--- a/lisp/dired.el
+++ b/lisp/dired.el
@@ -2419,6 +2419,8 @@ If the current buffer can be edited with Wdired, (i.e. 
the major
 mode is `dired-mode'), call `wdired-change-to-wdired-mode'.
 Otherwise, toggle `read-only-mode'."
   (interactive)
+  (unless (file-writable-p default-directory)
+    (user-error "Directory %s isn't writeable" default-directory))
   (if (derived-mode-p 'dired-mode)
       (wdired-change-to-wdired-mode)
     (read-only-mode 'toggle)))