Subject: Re: bug#17815: 24.4.50; (process-file) erroneously raises its buffer when running with TRAMP

From: Michael Albinus <[email-masked]>
Date: Fri, 20 Jun 2014 15:50:48 +0200

Stefan Monnier <[email-masked]> writes:

>> @Stefan: This is no regression, I could reproduce it even with Emacs
>> 23.4. Therefore, I will fix it in the trunk. Please tell me if you
>> believe it shall go into emacs-24.
>
> Show me the patch (when it's ready), so I can see whether it looks
> safe enough.

That's what I've committed to the Tramp repository:

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 76a3c48..ba410f1 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2014-06-20  Michael Albinus  <[email-masked]>
+
+	* tramp-adb.el (tramp-adb-handle-process-file):
+	* tramp-sh.el (tramp-sh-handle-process-file):
+	* tramp-smb.el (tramp-smb-handle-process-file): Do not raise the
+	output buffer when DISPLAY is non-nil.  (Bug#17815)
+
 2014-06-16  Michael Albinus  <[email-masked]>

 	* tramp.el (tramp-call-process): Handle error strings.
diff --git a/lisp/tramp-adb.el b/lisp/tramp-adb.el
index f38cecb..91caa4a 100644
--- a/lisp/tramp-adb.el
+++ b/lisp/tramp-adb.el
@@ -801,11 +801,11 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	     v (format "(cd %s; %s)"
 		       (tramp-shell-quote-argument localname) command)
 	     "")
-	    ;; We should show the output anyway.
+	    ;; We should add the output anyway.
 	    (when outbuf
 	      (with-current-buffer outbuf
 		(insert-buffer-substring (tramp-get-connection-buffer v)))
-	      (when display (display-buffer outbuf))))
+	      (when (and display (get-buffer-window outbuf t)) (redisplay))))
 	;; When the user did interrupt, we should do it also.  We use
 	;; return code -1 as marker.
 	(quit
diff --git a/lisp/tramp-sh.el b/lisp/tramp-sh.el
index a6771cd..68f1ef4 100644
--- a/lisp/tramp-sh.el
+++ b/lisp/tramp-sh.el
@@ -2994,13 +2994,13 @@ the result will be a local, non-Tramp, file name."
 				   command)
 			 t t)
 			0 1))
-	    ;; We should show the output anyway.
+	    ;; We should add the output anyway.
 	    (when outbuf
 	      (with-current-buffer outbuf
                 (insert
                  (with-current-buffer (tramp-get-connection-buffer v)
                    (buffer-string))))
-	      (when display (display-buffer outbuf))))
+	      (when (and display (get-buffer-window outbuf t)) (redisplay))))
 	;; When the user did interrupt, we should do it also.  We use
 	;; return code -1 as marker.
 	(quit
diff --git a/lisp/tramp-smb.el b/lisp/tramp-smb.el
index aa44b8d..15ae9ed 100644
--- a/lisp/tramp-smb.el
+++ b/lisp/tramp-smb.el
@@ -1225,8 +1225,8 @@ target of the symlink differ."
 	(error
 	 (setq ret 1)))

-      ;; We should show the output anyway.
-      (when (and outbuf display) (display-buffer outbuf))
+      ;; We should redisplay the output.
+      (when (and display outbuf (get-buffer-window outbuf t)) (redisplay))

       ;; Cleanup.  We remove all file cache values for the connection,
       ;; because the remote process could have changed them.
diff --git a/test/ChangeLog b/test/ChangeLog
index c672532..5ba0b82 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,8 @@
+2014-06-20  Michael Albinus  <[email-masked]>
+
+	* tramp-tests.el (tramp-test26-process-file): Extend test
+	according to Bug#17815.
+
 2014-06-15  Michael Albinus  <[email-masked]>

 	Version 2.2.10 released.
diff --git a/test/tramp-tests.el b/test/tramp-tests.el
index d30a5b0..b010ab4 100644
--- a/test/tramp-tests.el
+++ b/test/tramp-tests.el
@@ -1246,9 +1246,10 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
      (tramp-find-foreign-file-name-handler tramp-test-temporary-file-directory)
      '(tramp-gvfs-file-name-handler tramp-smb-file-name-handler))))

-  (let ((tmp-name (tramp--test-make-temp-name))
-	(default-directory tramp-test-temporary-file-directory)
-	kill-buffer-query-functions)
+  (let* ((tmp-name (tramp--test-make-temp-name))
+	 (fnnd (file-name-nondirectory tmp-name))
+	 (default-directory tramp-test-temporary-file-directory)
+	 kill-buffer-query-functions)
     (unwind-protect
 	(progn
 	  ;; We cannot use "/bin/true" and "/bin/false"; those paths
@@ -1259,17 +1260,25 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 	  (with-temp-buffer
 	    (write-region "foo" nil tmp-name)
 	    (should (file-exists-p tmp-name))
-	    (should
-	     (zerop
-	      (process-file "ls" nil t nil (file-name-nondirectory tmp-name))))
+	    (should (zerop (process-file "ls" nil t nil fnnd)))
+	    ;; `ls' could produce colorized output.
+	    (goto-char (point-min))
+	    (while (re-search-forward tramp-color-escape-sequence-regexp nil t)
+	      (replace-match "" nil nil))
+	    (should (string-equal (format "%s\n" fnnd) (buffer-string)))
+	    (should-not (get-buffer-window (current-buffer) t))
+
+	    ;; Second run. The output must be appended.
+	    (should (zerop (process-file "ls" nil t t fnnd)))
 	    ;; `ls' could produce colorized output.
 	    (goto-char (point-min))
 	    (while (re-search-forward tramp-color-escape-sequence-regexp nil t)
 	      (replace-match "" nil nil))
 	    (should
-	     (string-equal
-	      (format "%s\n" (file-name-nondirectory tmp-name))
-	      (buffer-string)))))
+	     (string-equal (format "%s\n%s\n" fnnd fnnd) (buffer-string)))
+	    ;; A non-nil DISPLAY must not raise the buffer.
+	    (should-not (get-buffer-window (current-buffer) t))))
+
       (ignore-errors (delete-file tmp-name)))))

 (ert-deftest tramp-test27-start-file-process ()

>         Stefan

Best regards, Michael.