master dfa16cadc1: Fix regression in last Tramp change

[Michael Albinus]

branch: master
commit dfa16cadc18930fad76fa6113750eaa27d367e72
Author: Michael Albinus <michael.albinus@gmx.de>
Commit: Michael Albinus <michael.albinus@gmx.de>

    Fix regression in last Tramp change
    
    * lisp/net/tramp-sh.el (tramp-readlink-file-truename): Remove.
    (tramp-sh-handle-file-truename): Revert implementation.  (Bug#56774)
---
 lisp/net/tramp-sh.el | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 6d32622742..b991de954c 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -620,21 +620,6 @@ on the remote file system.
 Format specifiers are replaced by `tramp-expand-script', percent
 characters need to be doubled.")
 
-(defconst tramp-readlink-file-truename
-  (format
-   (concat
-    "(echo -n %s &&"
-    " %%r --no-newline --canonicalize-missing \"$1\" &&"
-    " echo %s) |"
-    " sed -e 's/\"/\\\\\"/g' -e 's/%s/\"/g'")
-   tramp-stat-marker
-   tramp-stat-marker
-   tramp-stat-quoted-marker)
-  "Shell function to produce output suitable for use with `file-truename'
-on the remote file system.
-Format specifiers are replaced by `tramp-expand-script', percent
-characters need to be doubled.")
-
 (defconst tramp-perl-file-name-all-completions
   "%p -e '
 opendir(d, $ARGV[0]) || die(\"$ARGV[0]: $!\\nfail\\n\");
@@ -1193,14 +1178,15 @@ component is used as the target of the symlink."
         (tramp-message v 4 "Finding true name for `%s'" filename)
         (let ((result
                (cond
-                ;; Use GNU readlink --canonicalize-missing where
-                ;; available.
+                ;; Use GNU readlink --canonicalize-missing where available.
                 ((tramp-get-remote-readlink v)
-                 (tramp-maybe-send-script
-                  v tramp-readlink-file-truename 
"tramp_readlink_file_truename")
-                 (tramp-send-command-and-read
-                  v (format "tramp_readlink_file_truename %s"
-                            (tramp-shell-quote-argument localname))))
+                 (tramp-send-command-and-check
+                  v (format "%s --canonicalize-missing %s"
+                            (tramp-get-remote-readlink v)
+                            (tramp-shell-quote-argument localname)))
+                 (with-current-buffer (tramp-get-connection-buffer v)
+                   (goto-char (point-min))
+                   (buffer-substring (point-min) (point-at-eol))))
 
                 ;; Use Perl implementation.
                 ((and (tramp-get-remote-perl v)