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[Emacs-diffs] master 34bedf5 1/3: Sync with Tramp 2.4.0-pre


From: Michael Albinus
Subject: [Emacs-diffs] master 34bedf5 1/3: Sync with Tramp 2.4.0-pre
Date: Sat, 9 Dec 2017 08:35:16 -0500 (EST)

branch: master
commit 34bedf5d0b00713a2ba9baca5e025033477a0394
Author: Michael Albinus <address@hidden>
Commit: Michael Albinus <address@hidden>

    Sync with Tramp 2.4.0-pre
    
    * doc/misc/trampver.texi:
    * lisp/net/trampver.el: Change version to "2.4.0-pre".
    
    * lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
    Use `tramp-handle-file-directory-p'.
    (tramp-adb-parse-device-names)
    (tramp-adb-handle-expand-file-name)
    (tramp-adb-handle-file-truename, tramp-adb-handle-process-file):
    Adapt `tramp-make-tramp-file-name' call.
    (tramp-adb-handle-file-directory-p): Remove.
    (tramp-adb-maybe-open-connection): Do not set
    tramp-current-*.
    
    * lisp/net/tramp-cache.el (tramp-get-hash-table):
    Adapt `tramp-make-tramp-file-name' call.
    
    * lisp/net/tramp-cmds.el (tramp-cleanup-connection): Do not set
    tramp-current-*.
    
    * lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
    Use `tramp-handle-file-directory-p'.
    (tramp-gvfs-dbus-event-error): Trace with verbosity 6.
    (tramp-gvfs-do-copy-or-rename-file): Use `file-truename'.
    (tramp-gvfs-handle-file-directory-p): Remove.
    (tramp-gvfs-handler-askpassword): Do not set tramp-current-*.
    
    * lisp/net/tramp-sh.el (tramp-do-copy-or-rename-file-out-of-band)
    (tramp-sh-handle-start-file-process)
    (tramp-maybe-open-connection, tramp-get-remote-path): Do not
    set tramp-current-*.
    (tramp-maybe-open-connection): Set "password-vector" property.
    
    * lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
    Use `tramp-handle-file-accessible-directory-p' and
    `tramp-handle-file-directory-p'.
    (tramp-smb-handle-copy-directory, tramp-smb-handle-file-acl)
    (tramp-smb-handle-set-file-acl)
    (tramp-smb-maybe-open-connection): Do not set tramp-current-*.
    (tramp-smb-handle-file-directory-p): Remove.
    (tramp-smb-handle-make-symbolic-link):
    Use `tramp-get-connection-buffer' rather than `buffer-name'.
    
    * lisp/net/tramp.el (tramp-current-method, tramp-current-user)
    (tramp-current-domain, tramp-current-host)
    (tramp-current-port): Remove.
    (tramp-dissect-file-name): No special handling of localname anymore.
    (tramp-make-tramp-file-name): Reimplemnt with new signature.
    (tramp-completion-make-tramp-file-name): Fix docstring.
    (tramp-get-buffer, tramp-handle-file-name-as-directory)
    (tramp-handle-file-name-directory)
    (tramp-check-cached-permissions, tramp-local-host-p)
    (tramp-get-remote-tmpdir, tramp-clear-passwd):
    Adapt `tramp-make-tramp-file-name' call.
    (tramp-completion-handle-file-name-all-completions)
    (tramp-action-login, tramp-read-passwd): Do not set
    tramp-current-*.
    (tramp-handle-file-directory-p): New defun.
    (tramp-handle-verify-visited-file-modtime): Remove superfluous
    `with-parsed-tramp-file-name'.
    (tramp-process-actions, tramp-read-passwd):
    Use "password-vector" property.
    (tramp-call-process, tramp-call-process-region): No special
    setting of vec.
    (tramp-read-passwd): Handle "login-as" property.
    
    * test/lisp/net/tramp-tests.el (tramp-test21-file-links):
    Special code for "smb".
---
 doc/misc/trampver.texi       |   2 +-
 lisp/net/tramp-adb.el        |  44 ++----
 lisp/net/tramp-cache.el      |   5 +-
 lisp/net/tramp-cmds.el       |  11 +-
 lisp/net/tramp-gvfs.el       |  19 +--
 lisp/net/tramp-sh.el         |  44 ++----
 lisp/net/tramp-smb.el        | 143 ++++++++------------
 lisp/net/tramp.el            | 316 ++++++++++++++++++++-----------------------
 lisp/net/trampver.el         |   6 +-
 test/lisp/net/tramp-tests.el |  12 +-
 10 files changed, 244 insertions(+), 358 deletions(-)

diff --git a/doc/misc/trampver.texi b/doc/misc/trampver.texi
index 5d9dcc5..3122fac 100644
--- a/doc/misc/trampver.texi
+++ b/doc/misc/trampver.texi
@@ -8,7 +8,7 @@
 @c In the Tramp GIT, the version number is auto-frobbed from
 @c configure.ac, so you should edit that file and run
 @c "autoconf && ./configure" to change the version number.
address@hidden trampver 2.3.3-pre
address@hidden trampver 2.4.0-pre
 
 @c Other flags from configuration
 @set instprefix /usr/local
diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 8399c02..f1753ce 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -114,7 +114,7 @@ It is used for TCP/IP devices."
     (file-accessible-directory-p . tramp-handle-file-accessible-directory-p)
     (file-acl . ignore)
     (file-attributes . tramp-adb-handle-file-attributes)
-    (file-directory-p . tramp-adb-handle-file-directory-p)
+    (file-directory-p . tramp-handle-file-directory-p)
     (file-equal-p . tramp-handle-file-equal-p)
     ;; FIXME: This is too sloppy.
     (file-executable-p . tramp-handle-file-exists-p)
@@ -199,11 +199,13 @@ pass to the OPERATION."
     (with-temp-buffer
       ;; `call-process' does not react on timer under MS Windows.
       ;; That's why we use `start-process'.
+      ;; We don't know yet whether we need a user or host name for the
+      ;; connection vector.  We assume we don't, it will be OK in most
+      ;; of the cases.  Otherwise, there might be an additional trace
+      ;; buffer, which doesn't hurt.
       (let ((p (start-process
                tramp-adb-program (current-buffer) tramp-adb-program "devices"))
-           (v (make-tramp-file-name
-               :method tramp-adb-method :user tramp-current-user
-               :host tramp-current-host))
+           (v (make-tramp-file-name :method tramp-adb-method))
            result)
        (tramp-message v 6 "%s" (mapconcat 'identity (process-command p) " "))
        (process-put p 'adjust-window-size-function 'ignore)
@@ -245,16 +247,8 @@ pass to the OPERATION."
       ;; be problems with UNC shares or Cygwin mounts.
       (let ((default-directory (tramp-compat-temporary-file-directory)))
        (tramp-make-tramp-file-name
-        method user domain host port
-        (tramp-drop-volume-letter
-         (tramp-run-real-handler
-          'expand-file-name (list localname))))))))
-
-(defun tramp-adb-handle-file-directory-p (filename)
-  "Like `file-directory-p' for Tramp files."
-  (eq (tramp-compat-file-attribute-type
-       (file-attributes (file-truename filename)))
-      t))
+        v (tramp-drop-volume-letter
+           (tramp-run-real-handler 'expand-file-name (list localname))))))))
 
 (defun tramp-adb-handle-file-system-info (filename)
   "Like `file-system-info' for Tramp files."
@@ -288,7 +282,7 @@ pass to the OPERATION."
    "%s%s"
    (with-parsed-tramp-file-name (expand-file-name filename) nil
      (tramp-make-tramp-file-name
-      method user domain host port
+      v
       (with-tramp-file-property v localname "file-truename"
        (let ((result nil))                     ; result steps in reverse order
          (tramp-message v 4 "Finding true name for `%s'" filename)
@@ -316,12 +310,10 @@ pass to the OPERATION."
                    (tramp-compat-file-attribute-type
                     (file-attributes
                      (tramp-make-tramp-file-name
-                      method user domain host port
-                      (mapconcat 'identity
-                                 (append '("")
-                                         (reverse result)
-                                         (list thisstep))
-                                 "/")))))
+                      v (mapconcat 'identity
+                                   (append
+                                    '("") (reverse result) (list thisstep))
+                                   "/")))))
              (cond ((string= "." thisstep)
                     (tramp-message v 5 "Ignoring step `.'"))
                    ((string= ".." thisstep)
@@ -861,8 +853,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are 
completely ignored."
            (setq input (with-parsed-tramp-file-name infile nil localname))
          ;; INFILE must be copied to remote host.
          (setq input (tramp-make-tramp-temp-file v)
-               tmpinput (tramp-make-tramp-file-name
-                         method user domain host port input))
+               tmpinput (tramp-make-tramp-file-name v input))
          (copy-file infile tmpinput t)))
       (when input (setq command (format "%s <%s" command input)))
 
@@ -895,8 +886,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are 
completely ignored."
            ;; stderr must be copied to remote host.  The temporary
            ;; file must be deleted after execution.
            (setq stderr (tramp-make-tramp-temp-file v)
-                 tmpstderr (tramp-make-tramp-file-name
-                            method user domain host port stderr))))
+                 tmpstderr (tramp-make-tramp-file-name v stderr))))
         ;; stderr to be discarded.
         ((null (cadr destination))
          (setq stderr "/dev/null"))))
@@ -1252,10 +1242,6 @@ connection if a previous connection has died for some 
reason."
         (user (tramp-file-name-user vec))
          (device (tramp-adb-get-device vec)))
 
-    ;; Set variables for proper tracing in `tramp-adb-parse-device-names'.
-    (setq tramp-current-user   (tramp-file-name-user vec)
-         tramp-current-host   (tramp-file-name-host vec))
-
     ;; Maybe we know already that "su" is not supported.  We cannot
     ;; use a connection property, because we have not checked yet
     ;; whether it is still the same device.
diff --git a/lisp/net/tramp-cache.el b/lisp/net/tramp-cache.el
index dc97501..87ec3c2 100644
--- a/lisp/net/tramp-cache.el
+++ b/lisp/net/tramp-cache.el
@@ -98,10 +98,7 @@ matching entries of `tramp-connection-properties'."
          (dolist (elt tramp-connection-properties)
            (when (string-match
                   (or (nth 0 elt) "")
-                  (tramp-make-tramp-file-name
-                   (tramp-file-name-method key) (tramp-file-name-user key)
-                   (tramp-file-name-domain key) (tramp-file-name-host key)
-                   (tramp-file-name-port key) nil))
+                  (tramp-make-tramp-file-name key 'noloc 'nohop))
              (tramp-set-connection-property key (nth 1 elt) (nth 2 elt)))))
        hash)))
 
diff --git a/lisp/net/tramp-cmds.el b/lisp/net/tramp-cmds.el
index 37a6521..35c00a0 100644
--- a/lisp/net/tramp-cmds.el
+++ b/lisp/net/tramp-cmds.el
@@ -80,16 +80,7 @@ When called interactively, a Tramp connection has to be 
selected."
    ;; Return nil when there is no Tramp connection.
    (list
     (let ((connections
-          (mapcar
-           (lambda (x)
-             (tramp-make-tramp-file-name
-              (tramp-file-name-method x)
-              (tramp-file-name-user x)
-              (tramp-file-name-domain x)
-              (tramp-file-name-host x)
-              (tramp-file-name-port x)
-              (tramp-file-name-localname x)))
-           (tramp-list-connections)))
+          (mapcar 'tramp-make-tramp-file-name (tramp-list-connections)))
          name)
 
       (when connections
diff --git a/lisp/net/tramp-gvfs.el b/lisp/net/tramp-gvfs.el
index 1d1b04b..d862e95 100644
--- a/lisp/net/tramp-gvfs.el
+++ b/lisp/net/tramp-gvfs.el
@@ -429,6 +429,7 @@ Every entry is a list (NAME ADDRESS).")
     ("gvfs-trash" . "trash"))
   "List of cons cells, mapping \"gvfs-<command>\" to \"gio <command>\".")
 
+;; <http://www.pygtk.org/docs/pygobject/gio-constants.html>
 (defconst tramp-gvfs-file-attributes
   '("name"
     "type"
@@ -495,7 +496,7 @@ Every entry is a list (NAME ADDRESS).")
     (file-accessible-directory-p . tramp-handle-file-accessible-directory-p)
     (file-acl . ignore)
     (file-attributes . tramp-gvfs-handle-file-attributes)
-    (file-directory-p . tramp-gvfs-handle-file-directory-p)
+    (file-directory-p . tramp-handle-file-directory-p)
     (file-equal-p . tramp-handle-file-equal-p)
     (file-executable-p . tramp-gvfs-handle-file-executable-p)
     (file-exists-p . tramp-handle-file-exists-p)
@@ -642,7 +643,7 @@ is no information where to trace the message.")
 (defun tramp-gvfs-dbus-event-error (event err)
   "Called when a D-Bus error message arrives, see 
`dbus-event-error-functions'."
   (when tramp-gvfs-dbus-event-vector
-    (tramp-message tramp-gvfs-dbus-event-vector 10 "%S" event)
+    (tramp-message tramp-gvfs-dbus-event-vector 6 "%S" event)
     (tramp-error tramp-gvfs-dbus-event-vector 'file-error "%s" (cadr err))))
 
 ;; `dbus-event-error-hooks' has been renamed to
@@ -675,6 +676,7 @@ file names."
   (unless (memq op '(copy rename))
     (error "Unknown operation `%s', must be `copy' or `rename'" op))
 
+  (setq filename (file-truename filename))
   (if (file-directory-p filename)
       (progn
        (copy-directory filename newname keep-date t)
@@ -1043,11 +1045,6 @@ If FILE-SYSTEM is non-nil, return file system 
attributes."
         res-device
         )))))
 
-(defun tramp-gvfs-handle-file-directory-p (filename)
-  "Like `file-directory-p' for Tramp files."
-  (eq t (tramp-compat-file-attribute-type
-        (file-attributes (file-truename filename)))))
-
 (defun tramp-gvfs-handle-file-executable-p (filename)
   "Like `file-executable-p' for Tramp files."
   (with-parsed-tramp-file-name filename nil
@@ -1363,13 +1360,7 @@ ADDRESS can have the form \"xx:xx:xx:xx:xx:xx\" or 
\"[xx:xx:xx:xx:xx:xx]\"."
          (unless (tramp-get-connection-property l "first-password-request" nil)
            (tramp-clear-passwd l))
 
-         ;; Set variables for computing the prompt for reading password.
-         (setq tramp-current-method l-method
-               tramp-current-user user
-               tramp-current-domain l-domain
-               tramp-current-host l-host
-               tramp-current-port l-port
-               password (tramp-read-passwd
+         (setq password (tramp-read-passwd
                          (tramp-get-connection-process l) pw-prompt))
 
          ;; Return result.
diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 14c1a40..1ca19e0 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -2362,15 +2362,6 @@ The method used must be an out-of-band method."
                     (expand-file-name ".." tmpfile) 'recursive)
                  (delete-file tmpfile)))))
 
-       ;; Set variables for computing the prompt for reading password.
-       (setq tramp-current-method (tramp-file-name-method v)
-             tramp-current-user (or (tramp-file-name-user v)
-                                    (tramp-get-connection-property
-                                     v "login-as" nil))
-             tramp-current-domain (tramp-file-name-domain v)
-             tramp-current-host (tramp-file-name-host v)
-             tramp-current-port (tramp-file-name-port v))
-
        ;; Check which ones of source and target are Tramp files.
        (setq source (funcall
                      (if (and (file-directory-p filename)
@@ -2866,13 +2857,7 @@ the result will be a local, non-Tramp, file name."
           ;; We discard hops, if existing, that's why we cannot use
           ;; `file-remote-p'.
           (prompt (format "PS1=%s %s"
-                          (tramp-make-tramp-file-name
-                           (tramp-file-name-method v)
-                           (tramp-file-name-user v)
-                           (tramp-file-name-domain v)
-                           (tramp-file-name-host v)
-                           (tramp-file-name-port v)
-                           (tramp-file-name-localname v))
+                          (tramp-make-tramp-file-name v nil 'nohop)
                           tramp-initial-end-of-output))
           ;; We use as environment the difference to toplevel
           ;; `process-environment'.
@@ -4755,8 +4740,7 @@ connection if a previous connection has died for some 
reason."
                (set-process-sentinel p 'tramp-process-sentinel)
                (process-put p 'adjust-window-size-function 'ignore)
                (set-process-query-on-exit-flag p nil)
-               (setq tramp-current-connection (cons vec (current-time))
-                     tramp-current-host (system-name))
+               (setq tramp-current-connection (cons vec (current-time)))
 
                (tramp-message
                 vec 6 "%s" (mapconcat 'identity (process-command p) " "))
@@ -4810,16 +4794,15 @@ connection if a previous connection has died for some 
reason."
 
                    ;; Check, whether there is a restricted shell.
                    (dolist (elt tramp-restricted-shell-hosts-alist)
-                     (when (string-match elt tramp-current-host)
+                     (when (string-match elt l-host)
                        (setq r-shell t)))
 
-                   ;; Set variables for computing the prompt for
-                   ;; reading password.
-                   (setq tramp-current-method l-method
-                         tramp-current-user   l-user
-                         tramp-current-domain l-domain
-                         tramp-current-host   l-host
-                         tramp-current-port   l-port)
+                   ;; Set password prompt vector.
+                   (tramp-set-connection-property
+                    p "password-vector"
+                    (make-tramp-file-name
+                     :method l-method :user l-user :domain l-domain
+                     :host l-host :port l-port))
 
                    ;; Add login environment.
                    (when login-env
@@ -5244,14 +5227,7 @@ Nonexistent directories are removed from spec."
        (lambda (x)
          (and
           (stringp x)
-          (file-directory-p
-           (tramp-make-tramp-file-name
-            (tramp-file-name-method vec)
-            (tramp-file-name-user vec)
-            (tramp-file-name-domain vec)
-            (tramp-file-name-host vec)
-            (tramp-file-name-port vec)
-            x))
+          (file-directory-p (tramp-make-tramp-file-name vec x))
           x))
        remote-path)))))
 
diff --git a/lisp/net/tramp-smb.el b/lisp/net/tramp-smb.el
index a4d4b4e..5a8299b 100644
--- a/lisp/net/tramp-smb.el
+++ b/lisp/net/tramp-smb.el
@@ -228,10 +228,10 @@ See `tramp-actions-before-shell' for more info.")
     (dired-compress-file . ignore)
     (dired-uncache . tramp-handle-dired-uncache)
     (expand-file-name . tramp-smb-handle-expand-file-name)
-    (file-accessible-directory-p . tramp-smb-handle-file-directory-p)
+    (file-accessible-directory-p . tramp-handle-file-accessible-directory-p)
     (file-acl . tramp-smb-handle-file-acl)
     (file-attributes . tramp-smb-handle-file-attributes)
-    (file-directory-p .  tramp-smb-handle-file-directory-p)
+    (file-directory-p .  tramp-handle-file-directory-p)
     (file-file-equal-p . tramp-handle-file-equal-p)
     (file-executable-p . tramp-handle-file-exists-p)
     (file-exists-p . tramp-handle-file-exists-p)
@@ -449,13 +449,6 @@ pass to the OPERATION."
            (if (not (file-directory-p newname))
                (make-directory newname parents))
 
-           ;; Set variables for computing the prompt for reading password.
-           (setq tramp-current-method method
-                 tramp-current-user user
-                 tramp-current-domain domain
-                 tramp-current-host host
-                 tramp-current-port port)
-
            (let* ((share (tramp-smb-get-share v))
                   (localname (file-name-as-directory
                               (replace-regexp-in-string
@@ -739,62 +732,56 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are 
completely ignored."
 
 (defun tramp-smb-handle-file-acl (filename)
   "Like `file-acl' for Tramp files."
-  (with-parsed-tramp-file-name filename nil
-    (with-tramp-file-property v localname "file-acl"
-      (when (executable-find tramp-smb-acl-program)
-       ;; Set variables for computing the prompt for reading password.
-       (setq tramp-current-method method
-             tramp-current-user user
-             tramp-current-domain domain
-             tramp-current-host host
-             tramp-current-port port)
-
-       (let* ((share     (tramp-smb-get-share v))
-              (localname (replace-regexp-in-string
-                          "\\\\" "/" (tramp-smb-get-localname v)))
-              (args      (list (concat "//" host "/" share) "-E")))
-
-         (if (not (zerop (length user)))
-             (setq args (append args (list "-U" user)))
-           (setq args (append args (list "-N"))))
-
-         (when domain (setq args (append args (list "-W" domain))))
-         (when port   (setq args (append args (list "-p" port))))
-         (when tramp-smb-conf
-           (setq args (append args (list "-s" tramp-smb-conf))))
-         (setq
-          args
-          (append args (list (tramp-unquote-shell-quote-argument localname)
-                             "2>/dev/null")))
-
-         (unwind-protect
-             (with-temp-buffer
-               ;; Set the transfer process properties.
-               (tramp-set-connection-property
-                v "process-name" (buffer-name (current-buffer)))
-               (tramp-set-connection-property
-                v "process-buffer" (current-buffer))
-
-               ;; Use an asynchronous processes.  By this, password
-               ;; can be handled.
-               (let ((p (apply
-                         'start-process
-                         (tramp-get-connection-name v)
-                         (tramp-get-connection-buffer v)
-                         tramp-smb-acl-program args)))
-
-                 (tramp-message
-                  v 6 "%s" (mapconcat 'identity (process-command p) " "))
-                 (tramp-set-connection-property p "vector" v)
-                 (process-put p 'adjust-window-size-function 'ignore)
-                 (set-process-query-on-exit-flag p nil)
-                 (tramp-process-actions p v nil tramp-smb-actions-get-acl)
-                 (when (> (point-max) (point-min))
-                   (substring-no-properties (buffer-string)))))
-
-           ;; Reset the transfer process properties.
-           (tramp-set-connection-property v "process-name" nil)
-           (tramp-set-connection-property v "process-buffer" nil)))))))
+  (ignore-errors
+    (with-parsed-tramp-file-name filename nil
+      (with-tramp-file-property v localname "file-acl"
+       (when (executable-find tramp-smb-acl-program)
+         (let* ((share     (tramp-smb-get-share v))
+                (localname (replace-regexp-in-string
+                            "\\\\" "/" (tramp-smb-get-localname v)))
+                (args      (list (concat "//" host "/" share) "-E")))
+
+           (if (not (zerop (length user)))
+               (setq args (append args (list "-U" user)))
+             (setq args (append args (list "-N"))))
+
+           (when domain (setq args (append args (list "-W" domain))))
+           (when port   (setq args (append args (list "-p" port))))
+           (when tramp-smb-conf
+             (setq args (append args (list "-s" tramp-smb-conf))))
+           (setq
+            args
+            (append args (list (tramp-unquote-shell-quote-argument localname)
+                               "2>/dev/null")))
+
+           (unwind-protect
+               (with-temp-buffer
+                 ;; Set the transfer process properties.
+                 (tramp-set-connection-property
+                  v "process-name" (buffer-name (current-buffer)))
+                 (tramp-set-connection-property
+                  v "process-buffer" (current-buffer))
+
+                 ;; Use an asynchronous process.  By this, password can
+                 ;; be handled.
+                 (let ((p (apply
+                           'start-process
+                           (tramp-get-connection-name v)
+                           (tramp-get-connection-buffer v)
+                           tramp-smb-acl-program args)))
+
+                   (tramp-message
+                    v 6 "%s" (mapconcat 'identity (process-command p) " "))
+                   (tramp-set-connection-property p "vector" v)
+                   (process-put p 'adjust-window-size-function 'ignore)
+                   (set-process-query-on-exit-flag p nil)
+                   (tramp-process-actions p v nil tramp-smb-actions-get-acl)
+                   (when (> (point-max) (point-min))
+                     (substring-no-properties (buffer-string)))))
+
+             ;; Reset the transfer process properties.
+             (tramp-set-connection-property v "process-name" nil)
+             (tramp-set-connection-property v "process-buffer" nil))))))))
 
 (defun tramp-smb-handle-file-attributes (filename &optional id-format)
   "Like `file-attributes' for Tramp files."
@@ -911,13 +898,6 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are 
completely ignored."
            (list id link uid gid atime mtime ctime size mode nil inode
                  (tramp-get-device vec))))))))
 
-(defun tramp-smb-handle-file-directory-p (filename)
-  "Like `file-directory-p' for Tramp files."
-  (and (file-exists-p filename)
-       (eq ?d
-          (aref (tramp-compat-file-attribute-modes (file-attributes filename))
-                0))))
-
 (defun tramp-smb-handle-file-local-copy (filename)
   "Like `file-local-copy' for Tramp files."
   (with-parsed-tramp-file-name (file-truename filename) nil
@@ -1222,7 +1202,7 @@ component is used as the target of the symlink."
          (tramp-error
           v 'file-error
           "error with make-symbolic-link, see buffer `%s' for details"
-          (buffer-name)))))))
+          (tramp-get-connection-buffer v)))))))
 
 (defun tramp-smb-handle-process-file
   (program &optional infile destination display &rest args)
@@ -1403,15 +1383,9 @@ component is used as the target of the symlink."
   "Like `set-file-acl' for Tramp files."
   (ignore-errors
     (with-parsed-tramp-file-name filename nil
-      (when (and (stringp acl-string) (executable-find tramp-smb-acl-program))
-       ;; Set variables for computing the prompt for reading password.
-       (setq tramp-current-method method
-             tramp-current-user user
-             tramp-current-domain domain
-             tramp-current-host host
-             tramp-current-port port)
-       (tramp-set-file-property v localname "file-acl" 'undef)
+      (tramp-set-file-property v localname "file-acl" 'undef)
 
+      (when (and (stringp acl-string) (executable-find tramp-smb-acl-program))
        (let* ((share     (tramp-smb-get-share v))
               (localname (replace-regexp-in-string
                           "\\\\" "/" (tramp-smb-get-localname v)))
@@ -1971,13 +1945,6 @@ If ARGUMENT is non-nil, use it as argument for
              (process-put p 'adjust-window-size-function 'ignore)
              (set-process-query-on-exit-flag p nil)
 
-             ;; Set variables for computing the prompt for reading password.
-             (setq tramp-current-method tramp-smb-method
-                   tramp-current-user user
-                   tramp-current-domain domain
-                   tramp-current-host host
-                   tramp-current-port port)
-
              (condition-case err
                  (let (tramp-message-show-message)
                    ;; Play login scenario.
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 2fdc651..b933778 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -1182,21 +1182,6 @@ means to use always cached values for the directory 
contents."
 
 ;;; Internal Variables:
 
-(defvar tramp-current-method nil
-  "Connection method for this *tramp* buffer.")
-
-(defvar tramp-current-user nil
-  "Remote login name for this *tramp* buffer.")
-
-(defvar tramp-current-domain nil
-  "Remote domain name for this *tramp* buffer.")
-
-(defvar tramp-current-host nil
-  "Remote host for this *tramp* buffer.")
-
-(defvar tramp-current-port nil
-  "Remote port for this *tramp* buffer.")
-
 (defvar tramp-current-connection nil
   "Last connection timestamp.")
 
@@ -1390,7 +1375,7 @@ values."
 
        (make-tramp-file-name
         :method method :user user :domain domain :host host :port port
-        :localname (or localname "") :hop hop)))))
+        :localname localname :hop hop)))))
 
 (defun tramp-buffer-name (vec)
   "A name for the connection buffer VEC."
@@ -1401,30 +1386,64 @@ values."
        (format "*tramp/%s address@hidden" method user-domain host-port)
       (format "*tramp/%s %s*" method host-port))))
 
-(defun tramp-make-tramp-file-name
-    (method user domain host port localname &optional hop)
-  "Constructs a Tramp file name from METHOD, USER, HOST and LOCALNAME.
-When not nil, optional DOMAIN, PORT and HOP are used."
-  (concat tramp-prefix-format hop
-         (unless (or (zerop (length method))
-                      (zerop (length tramp-postfix-method-format)))
-           (concat method tramp-postfix-method-format))
-         user
-         (unless (zerop (length domain))
-           (concat tramp-prefix-domain-format domain))
-         (unless (zerop (length user))
-           tramp-postfix-user-format)
-         (when host
-           (if (string-match tramp-ipv6-regexp host)
-               (concat tramp-prefix-ipv6-format host tramp-postfix-ipv6-format)
-             host))
-         (unless (zerop (length port))
-           (concat tramp-prefix-port-format port))
-         tramp-postfix-host-format
-         (when localname localname)))
+(defun tramp-make-tramp-file-name (&rest args)
+  "Construct a Tramp file name from ARGS.
+
+ARGS could have two different signatures.  The first one is of
+type (VEC &optional LOCALNAME HOP).
+If LOCALNAME is nil, the value in VEC is used.  If it is a
+symbol, a null localname will be used.  Otherwise, LOCALNAME is
+expected to be a string, which will be used.
+If HOP is nil, the value in VEC is used.  If it is a symbol, a
+null hop will be used.  Otherwise, HOP is expected to be a
+string, which will be used.
+
+The other signature exists for backward compatibility.  It has
+the form (METHOD USER DOMAIN HOST PORT LOCALNAME &optional HOP)."
+  (let (method user domain host port localname hop)
+    (cond
+     ((tramp-file-name-p (car args))
+      (setq method (tramp-file-name-method (car args))
+           user (tramp-file-name-user (car args))
+           domain (tramp-file-name-domain (car args))
+           host (tramp-file-name-host (car args))
+           port (tramp-file-name-port (car args))
+           localname (tramp-file-name-localname (car args))
+           hop (tramp-file-name-hop (car args)))
+      (when (cadr args)
+       (setq localname (and (stringp (cadr args)) (cadr args))))
+      (when (cl-caddr args)
+       (setq hop (and (stringp (cl-caddr args)) (cl-caddr args)))))
+
+     (t (setq method (nth 0 args)
+             user (nth 1 args)
+             domain (nth 2 args)
+             host (nth 3 args)
+             port (nth 4 args)
+             localname (nth 5 args)
+             hop (nth 6 args))))
+
+    (concat tramp-prefix-format hop
+           (unless (or (zerop (length method))
+                       (zerop (length tramp-postfix-method-format)))
+             (concat method tramp-postfix-method-format))
+           user
+           (unless (zerop (length domain))
+             (concat tramp-prefix-domain-format domain))
+           (unless (zerop (length user))
+             tramp-postfix-user-format)
+           (when host
+             (if (string-match tramp-ipv6-regexp host)
+                 (concat
+                  tramp-prefix-ipv6-format host tramp-postfix-ipv6-format)
+               host))
+           (unless (zerop (length port))
+             (concat tramp-prefix-port-format port))
+           tramp-postfix-host-format
+           localname)))
 
 (defun tramp-completion-make-tramp-file-name (method user host localname)
-  "Constructs a Tramp file name from METHOD, USER, HOST and LOCALNAME.
+  "Construct a Tramp file name from METHOD, USER, HOST and LOCALNAME.
 It must not be a complete Tramp file name, but as long as there are
 necessary only.  This function will be used in file name completion."
   (concat tramp-prefix-format
@@ -1451,15 +1470,8 @@ necessary only.  This function will be used in file name 
completion."
        (tramp-set-connection-property
         vec "process-buffer"
         (tramp-get-connection-property vec "process-buffer" nil))
-       (setq buffer-undo-list t)
-       (setq default-directory
-             (tramp-make-tramp-file-name
-              (tramp-file-name-method vec)
-              (tramp-file-name-user vec)
-              (tramp-file-name-domain vec)
-              (tramp-file-name-host vec)
-              (tramp-file-name-port vec)
-              "/"))
+       (setq buffer-undo-list t
+             default-directory (tramp-make-tramp-file-name vec "/" 'nohop))
        (current-buffer))))
 
 (defun tramp-get-connection-buffer (vec)
@@ -2352,7 +2364,9 @@ remote file names."
 (defun tramp-register-file-name-handlers ()
   "Add Tramp file name handlers to `file-name-handler-alist'."
   ;; Remove autoloaded handlers from file name handler alist.  Useful,
-  ;; if `tramp-syntax' has been changed.
+  ;; if `tramp-syntax' has been changed.  We cannot call
+  ;; `tramp-unload-file-name-handlers', this would result in recursive
+  ;; loading of Tramp.
   (dolist (fnh '(tramp-file-name-handler
                 tramp-completion-file-name-handler
                 tramp-autoload-file-name-handler))
@@ -2488,7 +2502,6 @@ not in completion mode."
             (host (tramp-file-name-host elt))
             (localname (tramp-file-name-localname elt))
             (m (tramp-find-method method user host))
-            (tramp-current-user user) ; see `tramp-parse-passwd'
             all-user-hosts)
 
        (unless localname        ;; Nothing to complete.
@@ -2978,6 +2991,12 @@ User is always nil."
   (and (file-directory-p filename)
        (file-readable-p filename)))
 
+(defun tramp-handle-file-directory-p (filename)
+  "Like `file-directory-p' for Tramp files."
+  (eq (tramp-compat-file-attribute-type
+       (file-attributes (file-truename filename)))
+      t))
+
 (defun tramp-handle-file-equal-p (filename1 filename2)
   "Like `file-equalp-p' for Tramp files."
   ;; Native `file-equalp-p' calls `file-truename', which requires a
@@ -3018,17 +3037,11 @@ User is always nil."
     ;; Run the command on the localname portion only unless we are in
     ;; completion mode.
     (tramp-make-tramp-file-name
-     (tramp-file-name-method v)
-     (tramp-file-name-user v)
-     (tramp-file-name-domain v)
-     (tramp-file-name-host v)
-     (tramp-file-name-port v)
-     (if (and (zerop (length (tramp-file-name-localname v)))
-              (not (tramp-connectable-p file)))
-        ""
-       (tramp-run-real-handler
-       'file-name-as-directory (list (or (tramp-file-name-localname v) ""))))
-     (tramp-file-name-hop v))))
+     v (unless (and (zerop (length (tramp-file-name-localname v)))
+                   (not (tramp-connectable-p file)))
+        (tramp-run-real-handler
+         'file-name-as-directory
+         (list (or (tramp-file-name-localname v) "")))))))
 
 (defun tramp-handle-file-name-case-insensitive-p (filename)
   "Like `file-name-case-insensitive-p' for Tramp files."
@@ -3116,14 +3129,8 @@ User is always nil."
   (let ((v (tramp-dissect-file-name file t)))
     ;; Run the command on the localname portion only.
     (tramp-make-tramp-file-name
-     (tramp-file-name-method v)
-     (tramp-file-name-user v)
-     (tramp-file-name-domain v)
-     (tramp-file-name-host v)
-     (tramp-file-name-port v)
-     (tramp-run-real-handler
-      'file-name-directory (list (or (tramp-file-name-localname v) "")))
-     (tramp-file-name-hop v))))
+     v (tramp-run-real-handler
+       'file-name-directory (list (or (tramp-file-name-localname v) ""))))))
 
 (defun tramp-handle-file-name-nondirectory (file)
   "Like `file-name-nondirectory' but aware of Tramp files."
@@ -3162,7 +3169,8 @@ User is always nil."
          (and (or (not connected) c)
               (cond
                ((eq identification 'method) method)
-               ;; Domain and port are appended.
+               ;; Domain and port are appended to user and host,
+               ;; respectively.
                ((eq identification 'user) (tramp-file-name-user-domain v))
                ((eq identification 'host) (tramp-file-name-host-port v))
                ((eq identification 'localname) localname)
@@ -3574,29 +3582,28 @@ of."
              (eq (visited-file-modtime) 0)
              (not (file-remote-p f nil 'connected)))
          t
-       (with-parsed-tramp-file-name f nil
-         (let* ((remote-file-name-inhibit-cache t)
-                (attr (file-attributes f))
-                (modtime (tramp-compat-file-attribute-modification-time attr))
-                (mt (visited-file-modtime)))
-
-           (cond
-            ;; File exists, and has a known modtime.
-            ((and attr (not (equal modtime '(0 0))))
-             (< (abs (tramp-time-diff
-                      modtime
-                      ;; For compatibility, deal with both the old
-                      ;; (HIGH . LOW) and the new (HIGH LOW) return
-                      ;; values of `visited-file-modtime'.
-                      (if (atom (cdr mt))
-                          (list (car mt) (cdr mt))
-                        mt)))
-                2))
-            ;; Modtime has the don't know value.
-            (attr t)
-            ;; If file does not exist, say it is not modified if and
-            ;; only if that agrees with the buffer's record.
-            (t (equal mt '(-1 65535))))))))))
+       (let* ((remote-file-name-inhibit-cache t)
+              (attr (file-attributes f))
+              (modtime (tramp-compat-file-attribute-modification-time attr))
+              (mt (visited-file-modtime)))
+
+         (cond
+          ;; File exists, and has a known modtime.
+          ((and attr (not (equal modtime '(0 0))))
+           (< (abs (tramp-time-diff
+                    modtime
+                    ;; For compatibility, deal with both the old
+                    ;; (HIGH . LOW) and the new (HIGH LOW) return
+                    ;; values of `visited-file-modtime'.
+                    (if (atom (cdr mt))
+                        (list (car mt) (cdr mt))
+                      mt)))
+              2))
+          ;; Modtime has the don't know value.
+          (attr t)
+          ;; If file does not exist, say it is not modified if and
+          ;; only if that agrees with the buffer's record.
+          (t (equal mt '(-1 65535)))))))))
 
 (defun tramp-handle-file-notify-add-watch (filename _flags _callback)
   "Like `file-notify-add-watch' for Tramp files."
@@ -3633,17 +3640,16 @@ of."
 
 (defun tramp-action-login (_proc vec)
   "Send the login name."
-  (when (not (stringp tramp-current-user))
-    (setq tramp-current-user
-         (with-tramp-connection-property vec "login-as"
-           (save-window-excursion
-             (let ((enable-recursive-minibuffers t))
-               (pop-to-buffer (tramp-get-connection-buffer vec))
-               (read-string (match-string 0)))))))
-  (with-current-buffer (tramp-get-connection-buffer vec)
-    (tramp-message vec 6 "\n%s" (buffer-string)))
-  (tramp-message vec 3 "Sending login name `%s'" tramp-current-user)
-  (tramp-send-string vec (concat tramp-current-user tramp-local-end-of-line)))
+  (let ((user (or (tramp-file-name-user vec)
+                 (with-tramp-connection-property vec "login-as"
+                   (save-window-excursion
+                     (let ((enable-recursive-minibuffers t))
+                       (pop-to-buffer (tramp-get-connection-buffer vec))
+                       (read-string (match-string 0))))))))
+    (with-current-buffer (tramp-get-connection-buffer vec)
+      (tramp-message vec 6 "\n%s" (buffer-string)))
+    (tramp-message vec 3 "Sending login name `%s'" user)
+    (tramp-send-string vec (concat user tramp-local-end-of-line))))
 
 (defun tramp-action-password (proc vec)
   "Query the user for a password."
@@ -3767,12 +3773,11 @@ PROC and VEC indicate the remote connection to be used. 
 POS, if
 set, is the starting point of the region to be deleted in the
 connection buffer."
   ;; Enable `auth-source', unless "emacs -Q" has been called.  We must
-  ;; use `tramp-current-*' variables in case we have several hops.
+  ;; use the "password-vector" property in case we have several hops.
   (tramp-set-connection-property
-   (make-tramp-file-name
-    :method tramp-current-method :user tramp-current-user
-    :domain tramp-current-domain :host tramp-current-host
-    :port tramp-current-port)
+   (tramp-get-connection-property
+    proc "password-vector"
+    (tramp-get-connection-property proc "vector" nil))
    "first-password-request" tramp-cache-read-persistent-data)
   (save-restriction
     (with-tramp-progress-reporter
@@ -4140,15 +4145,7 @@ be granted."
                 vec (tramp-file-name-localname vec)
                 (concat "file-attributes-" suffix) nil)
                (file-attributes
-                (tramp-make-tramp-file-name
-                 (tramp-file-name-method vec)
-                 (tramp-file-name-user vec)
-                 (tramp-file-name-domain vec)
-                 (tramp-file-name-host vec)
-                 (tramp-file-name-port vec)
-                 (tramp-file-name-localname vec)
-                 (tramp-file-name-hop vec))
-                (intern suffix))))
+                (tramp-make-tramp-file-name vec) (intern suffix))))
               (remote-uid
                (tramp-get-connection-property
                 vec (concat "uid-" suffix) nil))
@@ -4205,11 +4202,7 @@ be granted."
      ;; The local temp directory must be writable for the other user.
      (file-writable-p
       (tramp-make-tramp-file-name
-       (tramp-file-name-method vec)
-       (tramp-file-name-user vec)
-       (tramp-file-name-domain vec)
-       host port
-       (tramp-compat-temporary-file-directory)))
+       vec (tramp-compat-temporary-file-directory) 'nohop))
      ;; On some systems, chown runs only for root.
      (or (zerop (user-uid))
         ;; This is defined in tramp-sh.el.  Let's assume this is
@@ -4219,14 +4212,9 @@ be granted."
 (defun tramp-get-remote-tmpdir (vec)
   "Return directory for temporary files on the remote host identified by VEC."
   (with-tramp-connection-property vec "tmpdir"
-    (let ((dir (tramp-make-tramp-file-name
-               (tramp-file-name-method vec)
-               (tramp-file-name-user vec)
-               (tramp-file-name-domain vec)
-               (tramp-file-name-host vec)
-               (tramp-file-name-port vec)
-               (or (tramp-get-method-parameter vec 'tramp-tmpdir) "/tmp")
-               (tramp-file-name-hop vec))))
+    (let ((dir
+          (tramp-make-tramp-file-name
+           vec (or (tramp-get-method-parameter vec 'tramp-tmpdir) "/tmp"))))
       (or (and (file-directory-p dir) (file-writable-p dir)
               (file-remote-p dir 'localname))
          (tramp-error vec 'file-error "Directory %s not accessible" dir))
@@ -4339,15 +4327,10 @@ It always returns a return code.  The Lisp error raised 
when
 PROGRAM is nil is trapped also, returning 1.  Furthermore, traces
 are written with verbosity of 6."
   (let ((default-directory  (tramp-compat-temporary-file-directory))
-       (v (or vec
-              (make-tramp-file-name
-               :method tramp-current-method :user tramp-current-user
-               :domain tramp-current-domain :host tramp-current-host
-               :port tramp-current-port)))
        (destination (if (eq destination t) (current-buffer) destination))
        output error result)
     (tramp-message
-     v 6 "`%s %s' %s %s"
+     vec 6 "`%s %s' %s %s"
      program (mapconcat 'identity args " ") infile destination)
     (condition-case err
        (with-temp-buffer
@@ -4365,8 +4348,8 @@ are written with verbosity of 6."
        (setq error (error-message-string err)
             result 1)))
     (if (zerop (length error))
-       (tramp-message v 6 "%d\n%s" result output)
-      (tramp-message v 6 "%d\n%s\n%s" result output error))
+       (tramp-message vec 6 "%d\n%s" result output)
+      (tramp-message vec 6 "%d\n%s\n%s" result output error))
     result))
 
 (defun tramp-call-process-region
@@ -4376,15 +4359,10 @@ It always returns a return code.  The Lisp error raised 
when
 PROGRAM is nil is trapped also, returning 1.  Furthermore, traces
 are written with verbosity of 6."
   (let ((default-directory  (tramp-compat-temporary-file-directory))
-       (v (or vec
-              (make-tramp-file-name
-               :method tramp-current-method :user tramp-current-user
-               :domain tramp-current-domain :host tramp-current-host
-               :port tramp-current-port)))
        (buffer (if (eq buffer t) (current-buffer) buffer))
        result)
     (tramp-message
-     v 6 "`%s %s' %s %s %s %s"
+     vec 6 "`%s %s' %s %s %s %s"
      program (mapconcat 'identity args " ") start end delete buffer)
     (condition-case err
        (progn
@@ -4397,11 +4375,11 @@ are written with verbosity of 6."
            (signal 'file-error (list result)))
          (with-current-buffer (if (bufferp buffer) buffer (current-buffer))
             (if (zerop result)
-                (tramp-message v 6 "%d" result)
-              (tramp-message v 6 "%d\n%s" result (buffer-string)))))
+                (tramp-message vec 6 "%d" result)
+              (tramp-message vec 6 "%d\n%s" result (buffer-string)))))
       (error
        (setq result 1)
-       (tramp-message v 6 "%d\n%s" result (error-message-string err))))
+       (tramp-message vec 6 "%d\n%s" result (error-message-string err))))
     result))
 
 ;;;###tramp-autoload
@@ -4411,8 +4389,13 @@ Consults the auth-source package.
 Invokes `password-read' if available, `read-passwd' else."
   (let* ((case-fold-search t)
         (key (tramp-make-tramp-file-name
-              tramp-current-method tramp-current-user tramp-current-domain
-              tramp-current-host tramp-current-port ""))
+              ;; In tramp-sh.el, we must use "password-vector" due to
+              ;; multi-hop.
+              (tramp-get-connection-property
+               proc "password-vector"
+               ;; All other backends simply use "vector".
+               (tramp-get-connection-property proc "vector" nil))
+              'noloc 'nohop))
         (pw-prompt
          (or prompt
              (with-current-buffer (process-buffer proc)
@@ -4424,6 +4407,8 @@ Invokes `password-read' if available, `read-passwd' else."
 
     (unwind-protect
        (with-parsed-tramp-file-name key nil
+         (setq user
+               (or user (tramp-get-connection-property key "login-as" nil)))
          (prog1
              (or
               ;; See if auth-sources contains something useful.
@@ -4434,24 +4419,16 @@ Invokes `password-read' if available, `read-passwd' 
else."
                      (setq auth-info
                            (auth-source-search
                             :max 1
-                            (and tramp-current-user :user)
-                            (if tramp-current-domain
-                                (format
-                                 "%s%s%s"
-                                 tramp-current-user tramp-prefix-domain-format
-                                 tramp-current-domain)
-                              tramp-current-user)
+                            (and user :user)
+                            (if domain
+                                (concat user tramp-prefix-domain-format domain)
+                              user)
                             :host
-                            (if tramp-current-port
-                                (format
-                                 "%s%s%s"
-                                 tramp-current-host tramp-prefix-port-format
-                                 tramp-current-port)
-                              tramp-current-host)
-                            :port tramp-current-method
-                            :require
-                            (cons
-                             :secret (and tramp-current-user '(:user))))
+                            (if port
+                                (concat host tramp-prefix-port-format port)
+                              host)
+                            :port method
+                            :require (cons :secret (and user '(:user))))
                            auth-passwd (plist-get
                                         (nth 0 auth-info) :secret)
                            auth-passwd (if (functionp auth-passwd)
@@ -4471,11 +4448,7 @@ Invokes `password-read' if available, `read-passwd' 
else."
 (defun tramp-clear-passwd (vec)
   "Clear password cache for connection related to VEC."
   (let ((method (tramp-file-name-method vec))
-       (user (tramp-file-name-user vec))
-       (domain (tramp-file-name-domain vec))
        (user-domain (tramp-file-name-user-domain vec))
-       (host (tramp-file-name-host vec))
-       (port (tramp-file-name-port vec))
        (host-port (tramp-file-name-host-port vec))
        (hop (tramp-file-name-hop vec)))
     (when hop
@@ -4490,8 +4463,7 @@ Invokes `password-read' if available, `read-passwd' else."
     (auth-source-forget
      `(:max 1 ,(and user-domain :user) ,user-domain
        :host ,host-port :port ,method))
-    (password-cache-remove
-     (tramp-make-tramp-file-name method user domain host port ""))))
+    (password-cache-remove (tramp-make-tramp-file-name vec 'noloc 'nohop))))
 
 ;; Snarfed code from time-date.el.
 
diff --git a/lisp/net/trampver.el b/lisp/net/trampver.el
index 51af455..4506698 100644
--- a/lisp/net/trampver.el
+++ b/lisp/net/trampver.el
@@ -7,7 +7,7 @@
 ;; Maintainer: Michael Albinus <address@hidden>
 ;; Keywords: comm, processes
 ;; Package: tramp
-;; Version: 2.3.3-pre
+;; Version: 2.4.0-pre
 
 ;; This file is part of GNU Emacs.
 
@@ -33,7 +33,7 @@
 ;; should be changed only there.
 
 ;;;###tramp-autoload
-(defconst tramp-version "2.3.3-pre"
+(defconst tramp-version "2.4.0-pre"
   "This version of Tramp.")
 
 ;;;###tramp-autoload
@@ -55,7 +55,7 @@
 ;; Check for Emacs version.
 (let ((x (if (>= emacs-major-version 24)
     "ok"
-  (format "Tramp 2.3.3-pre is not fit for %s"
+  (format "Tramp 2.4.0-pre is not fit for %s"
          (when (string-match "^.*$" (emacs-version))
            (match-string 0 (emacs-version)))))))
   (unless (string-match "\\`ok\\'" x) (error "%s" x)))
diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index a9d6e74..5fb3162 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -2877,9 +2877,15 @@ This tests also `make-symbolic-link', `file-truename' 
and `add-name-to-file'."
          (tramp--test-ignore-make-symbolic-link-error
            (make-symbolic-link tmp-name2 tmp-name1)
            (should (file-symlink-p tmp-name1))
-           (make-symbolic-link tmp-name1 tmp-name2)
-           (should (file-symlink-p tmp-name2))
-           (should-error (file-truename tmp-name1) :type 'file-error))
+           (if (tramp-smb-file-name-p tramp-test-temporary-file-directory)
+               ;; The symlink command of `smbclient' detects the
+               ;; cycle already.
+               (should-error
+                (make-symbolic-link tmp-name1 tmp-name2)
+                :type 'file-error)
+             (make-symbolic-link tmp-name1 tmp-name2)
+             (should (file-symlink-p tmp-name2))
+             (should-error (file-truename tmp-name1) :type 'file-error)))
 
        ;; Cleanup.
        (ignore-errors



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