* net/tramp-sh.el (tramp-do-copy-or-rename-file-via-buffer): Don't use

a local copy; setting `inhibit-file-name-handlers' proper might be
more performant.

Fixes: debbugs:18751

2 files changed, 13 insertions, 6 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d0d61da52f4..12a140d445d 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2014-11-04  Michael Albinus  <michael.albinus@gmx.de>
+
+        * net/tramp-sh.el (tramp-do-copy-or-rename-file-via-buffer): Don't use
+        a local copy; setting `inhibit-file-name-handlers' proper might be
+        more performant.  (Bug#18751)
+
 2014-11-04  Glenn Morris  <rgm@gnu.org>
 
         * mail/emacsbug.el (report-emacs-bug): No longer include
diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index a72a79a7797..3103eb0daa2 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -2061,15 +2061,16 @@ FILENAME is the source file, NEWNAME the target file.
 KEEP-DATE is non-nil if NEWNAME should have the same timestamp as FILENAME."
   (with-temp-buffer
     ;; We must disable multibyte, because binary data shall not be
-    ;; converted.  `insert-file-contents-literally' does not support
-    ;; file name handlers for GNU Emacs; we must create a local copy
-    ;; therefore.
+    ;; converted.  We remove `tramp-file-name-handler' from
+    ;; `inhibit-file-name-handlers'; otherwise the file name handler
+    ;; for `insert-file-contents' might be deactivated in some corner
+    ;; cases.
     (set-buffer-multibyte nil)
     (let ((coding-system-for-read 'binary)
           (jka-compr-inhibit t)
-          (tmpfile (file-local-copy filename)))
-      (insert-file-contents-literally (or tmpfile filename))
-      (when tmpfile (delete-file tmpfile)))
+          (inhibit-file-name-handlers
+           (remq 'tramp-file-name-handler inhibit-file-name-handlers)))
+      (insert-file-contents-literally filename))
     ;; We don't want the target file to be compressed, so we let-bind
     ;; `jka-compr-inhibit' to t.
     (let ((coding-system-for-write 'binary)