* autorevert.el (auto-revert-use-notify): Use

`custom-initialize-default' for initialization.  (Bug#13583)

1 files changed, 65 insertions, 1 deletions

diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 63e966b91b2..65a514c8e36 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -988,7 +988,8 @@ This is used to map a mode number to a permission string.")
     (set-file-selinux-context . tramp-sh-handle-set-file-selinux-context)
     (file-acl . tramp-sh-handle-file-acl)
     (set-file-acl . tramp-sh-handle-set-file-acl)
-    (vc-registered . tramp-sh-handle-vc-registered))
+    (vc-registered . tramp-sh-handle-vc-registered)
+    (inotify-add-watch . tramp-sh-handle-inotify-add-watch))
   "Alist of handler functions.
 Operations not mentioned here will be handled by the normal Emacs functions.")
 
@@ -3487,6 +3488,64 @@ Fall back to normal file name handler if no Tramp handler exists."
 	 ;; Default file name handlers, we don't care.
 	 (t (tramp-run-real-handler operation args)))))))
 
+(defun tramp-sh-handle-inotify-add-watch (file-name aspect callback)
+  "Like `inotify-add-watch' for Tramp files."
+  (setq file-name (expand-file-name file-name))
+  (unless (consp aspect) (setq aspect (cons aspect nil)))
+  (with-parsed-tramp-file-name file-name nil
+    (let* ((default-directory (file-name-directory file-name))
+	   (command (tramp-get-remote-inotifywait v))
+	   (aspect (mapconcat
+		    (lambda (x)
+		      (replace-regexp-in-string "-" "_" (symbol-name x)))
+		    aspect ","))
+	   (p (and command
+		   (start-file-process
+		    "inotifywait" nil command "-mq" "-e" aspect localname))))
+      (when (processp p)
+	(tramp-compat-set-process-query-on-exit-flag p nil)
+	(set-process-filter p 'tramp-sh-inotify-process-filter)
+	(tramp-set-connection-property p "inotify-callback" callback)
+	;; Return the file-name vector as watch-descriptor.
+	(tramp-set-connection-property p "inotify-watch-descriptor" v)))))
+
+(defun tramp-sh-inotify-process-filter (proc string)
+  "Read output from \"inotifywait\" and add corresponding inotify events."
+  (tramp-message
+   (tramp-get-connection-property proc "vector" nil) 6
+   (format "%s\n%s" proc string))
+  (dolist (line (split-string string "[\n\r]+" 'omit-nulls))
+    ;; Check, whether there is a problem.
+    (unless
+	(string-match
+	 "^[^[:blank:]]+[[:blank:]]+\\([^[:blank:]]+\\)+\\([[:blank:]]+\\([^[:blank:]]+\\)\\)?[[:blank:]]*$" line)
+      (tramp-error proc 'filewatch-error "%s" line))
+
+    (let* ((object
+	    (list
+	     (tramp-get-connection-property
+	      proc "inotify-watch-descriptor" nil)
+	     ;; Aspect symbols.  We filter out MOVE and CLOSE, which
+	     ;; are convenience macros.  See INOTIFY(7).
+	     (mapcar
+	      (lambda (x)
+		(intern-soft (replace-regexp-in-string "_" "-" (downcase x))))
+	      (delete "MOVE" (delete "CLOSE"
+	        (split-string (match-string 1 line) "," 'omit-nulls))))
+	     ;; We cannot gather any cookie value.  So we return 0 as
+	     ;; "don't know".
+	     0 (match-string 3 line)))
+	   (callback
+	    (tramp-get-connection-property proc "inotify-callback" nil))
+	   (event `(file-inotify ,object ,callback)))
+
+      ;; Usually, we would add an Emacs event now.  Unfortunately,
+      ;; `unread-command-events' does not accept several events at
+      ;; once.  Therefore, we apply the callback directly.
+      ;(setq unread-command-events (cons event unread-command-events)))))
+      (let ((last-input-event event))
+	(funcall callback object)))))
+
 ;;; Internal Functions:
 
 (defun tramp-maybe-send-script (vec script name)
@@ -5046,6 +5105,11 @@ This is used internally by `tramp-file-mode-from-int'."
     (tramp-message vec 5 "Finding a suitable `trash' command")
     (tramp-find-executable vec "trash" (tramp-get-remote-path vec))))
 
+(defun tramp-get-remote-inotifywait (vec)
+  (with-tramp-connection-property vec "inotifywait"
+    (tramp-message vec 5 "Finding a suitable `inotifywait' command")
+    (tramp-find-executable vec "inotifywait" (tramp-get-remote-path vec) t t)))
+
 (defun tramp-get-remote-id (vec)
   (with-tramp-connection-property vec "id"
     (tramp-message vec 5 "Finding POSIX `id' command")