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master 64af3c9: Finish implementation of {set-}file-modes FLAG arg in Tr


From: Michael Albinus
Subject: master 64af3c9: Finish implementation of {set-}file-modes FLAG arg in Tramp
Date: Tue, 25 Feb 2020 07:26:06 -0500 (EST)

branch: master
commit 64af3c94a6197cd0c6a283880c900eeb5bf12961
Author: Michael Albinus <address@hidden>
Commit: Michael Albinus <address@hidden>

    Finish implementation of {set-}file-modes FLAG arg in Tramp
    
    * lisp/net/tramp-adb.el (tramp-adb-handle-file-local-copy): Do not use
    'nofollow for temporary files.  Use `tramp-compat-set-file-modes'.
    (tramp-adb-handle-write-region): Do not use 'nofollow for
    temporary files.
    (tramp-adb-handle-set-file-modes): Implement FLAG.
    
    * lisp/net/tramp-compat.el (tramp-compat-file-modes)
    (tramp-compat-set-file-modes): New defaliases.
    
    * lisp/net/tramp-gvfs.el (tramp-gvfs-handle-set-file-modes):
    Make explicit check (eq flag 'nofollow).
    
    * lisp/net/tramp-sh.el (tramp-sh-handle-set-file-modes): Implement FLAG.
    (tramp-do-copy-or-rename-file-directly)
    (tramp-sh-handle-file-local-copy, tramp-sh-handle-write-region):
    Do not use 'nofollow for temporary files.
    (tramp-get-remote-chmod-h): New defun.
    
    * lisp/net/tramp-smb.el (tramp-smb-handle-set-file-modes):
    Implement FLAG.
    
    * lisp/net/tramp-sudoedit.el (tramp-sudoedit-handle-set-file-modes):
    Implement FLAG.
    (tramp-sudoedit-handle-write-region): Use `tramp-compat-set-file-modes'.
    
    * lisp/net/tramp.el (tramp-default-file-modes): Optional argument FLAG.
    (tramp-handle-file-modes): Use `file-truename' instead of
    `file-chase-links'.  The latter function does not work for remote
    file names.
    (tramp-handle-write-region): Call `tramp-default-file-modes' with
    'nofollow if needed.  Do not use 'nofollow for temporary files.
    
    * test/lisp/net/tramp-tests.el
    (tramp--test-ignore-make-symbolic-link-error): Check also for
    "Cannot chmod .* with nofollow flag" error.
    (tramp-test20-file-modes): Extend test.
    (tramp--test-emacs28-p): New defun.
---
 lisp/net/tramp-adb.el        | 11 +++---
 lisp/net/tramp-compat.el     | 22 ++++++++++--
 lisp/net/tramp-gvfs.el       |  2 +-
 lisp/net/tramp-sh.el         | 44 ++++++++++++++++-------
 lisp/net/tramp-smb.el        |  3 +-
 lisp/net/tramp-sudoedit.el   | 21 +++++------
 lisp/net/tramp.el            | 27 +++++++-------
 test/lisp/net/tramp-tests.el | 86 +++++++++++++++++++++++++++++++++++---------
 8 files changed, 156 insertions(+), 60 deletions(-)

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 96ef95d..a118e7d 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -591,8 +591,9 @@ Emacs dired can't find files."
          (ignore-errors (delete-file tmpfile))
          (tramp-error
           v 'file-error "Cannot make local copy of file `%s'" filename))
-       (set-file-modes tmpfile (logior (or (file-modes filename) 0) #o0400)
-                       'nofollow))
+       (set-file-modes
+        tmpfile
+        (logior (or (tramp-compat-file-modes filename 'nofollow) 0) #o0400)))
       tmpfile)))
 
 (defun tramp-adb-handle-file-writable-p (filename)
@@ -637,8 +638,7 @@ But handle the case, if the \"test\" command is not 
available."
           (tmpfile (tramp-compat-make-temp-file filename)))
       (when (and append (file-exists-p filename))
        (copy-file filename tmpfile 'ok)
-       (set-file-modes tmpfile (logior (or (file-modes tmpfile) 0) #o0600)
-                       'nofollow))
+       (set-file-modes tmpfile (logior (or (file-modes tmpfile) 0) #o0600)))
       (tramp-run-real-handler
        #'write-region (list start end tmpfile append 'no-message lockname))
       (with-tramp-progress-reporter
@@ -669,8 +669,9 @@ But handle the case, if the \"test\" command is not 
available."
 
 (defun tramp-adb-handle-set-file-modes (filename mode &optional flag)
   "Like `set-file-modes' for Tramp files."
-  flag ;; FIXME: Support 'nofollow'.
   (with-parsed-tramp-file-name filename nil
+    (when (and (eq flag 'nofollow) (file-symlink-p filename))
+      (tramp-error v 'file-error "Cannot chmod %s with %s flag" filename flag))
     (tramp-flush-file-properties v localname)
     (tramp-adb-send-command-and-check v (format "chmod %o %s" mode 
localname))))
 
diff --git a/lisp/net/tramp-compat.el b/lisp/net/tramp-compat.el
index 87bcd08..8f85550 100644
--- a/lisp/net/tramp-compat.el
+++ b/lisp/net/tramp-compat.el
@@ -165,7 +165,7 @@ This is a string of ten letters or dashes as in ls -l."
   "The error symbol for the `file-missing' error.")
 
 ;; `file-local-name', `file-name-quoted-p', `file-name-quote' and
-;; `file-name-unquote' are introduced in Emacs 26.
+;; `file-name-unquote' are introduced in Emacs 26.1.
 (defalias 'tramp-compat-file-local-name
   (if (fboundp 'file-local-name)
       #'file-local-name
@@ -175,7 +175,8 @@ It returns a file name which can be used directly as 
argument of
 `process-file', `start-file-process', or `shell-command'."
       (or (file-remote-p name 'localname) name))))
 
-;; `file-name-quoted-p' got a second argument in Emacs 27.1.
+;; `file-name-quoted-p', `file-name-quote' and `file-name-unquote' got
+;; a second argument in Emacs 27.1.
 (defalias 'tramp-compat-file-name-quoted-p
   (if (and
        (fboundp 'file-name-quoted-p)
@@ -217,7 +218,7 @@ NAME is unquoted."
           localname (if (= (length localname) 2) "/" (substring localname 2))))
        (concat (file-remote-p name) localname)))))
 
-;; `tramp-syntax' has changed its meaning in Emacs 26.  We still
+;; `tramp-syntax' has changed its meaning in Emacs 26.1.  We still
 ;; support old settings.
 (defsubst tramp-compat-tramp-syntax ()
   "Return proper value of `tramp-syntax'."
@@ -275,6 +276,19 @@ A nil value for either argument stands for the current 
time."
     (lambda (reporter &optional value _suffix)
       (progress-reporter-update reporter value))))
 
+;; `file-modes' and `set-file-modes' got argument FLAG in Emacs 28.1.
+(defalias 'tramp-compat-file-modes
+  (if (equal (tramp-compat-funcall 'func-arity #'file-modes) '(1 . 2))
+      #'file-modes
+    (lambda (filename &optional _flag)
+      (file-modes filename))))
+
+(defalias 'tramp-compat-set-file-modes
+  (if (equal (tramp-compat-funcall 'func-arity #'set-file-modes) '(2 . 3))
+      #'set-file-modes
+    (lambda (filename mode &optional _flag)
+      (set-file-modes filename mode))))
+
 (add-hook 'tramp-unload-hook
          (lambda ()
            (unload-feature 'tramp-loaddefs 'force)
@@ -284,6 +298,8 @@ A nil value for either argument stands for the current 
time."
 
 ;;; TODO:
 ;;
+;; * `func-arity' exists since Emacs 26.1.
+;;
 ;; * Starting with Emacs 27.1, there's no need to escape open
 ;;   parentheses with a backslash in docstrings anymore.
 
diff --git a/lisp/net/tramp-gvfs.el b/lisp/net/tramp-gvfs.el
index 7983580..3ce7bbb 100644
--- a/lisp/net/tramp-gvfs.el
+++ b/lisp/net/tramp-gvfs.el
@@ -1567,7 +1567,7 @@ If FILE-SYSTEM is non-nil, return file system attributes."
   (with-parsed-tramp-file-name filename nil
     (tramp-flush-file-properties v localname)
     (tramp-gvfs-send-command
-     v "gvfs-set-attribute" (if flag "-nt" "-t") "uint32"
+     v "gvfs-set-attribute" (if (eq flag 'nofollow) "-nt" "-t") "uint32"
      (tramp-gvfs-url-file-name (tramp-make-tramp-file-name v))
      "unix::mode" (number-to-string mode))))
 
diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index f31d361..761f594 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -1481,13 +1481,17 @@ of."
 (defun tramp-sh-handle-set-file-modes (filename mode &optional flag)
   "Like `set-file-modes' for Tramp files."
   (with-parsed-tramp-file-name filename nil
-    (tramp-flush-file-properties v localname)
-    flag ;; FIXME: Support 'nofollow'.
-    ;; FIXME: extract the proper text from chmod's stderr.
-    (tramp-barf-unless-okay
-     v
-     (format "chmod %o %s" mode (tramp-shell-quote-argument localname))
-     "Error while changing file's mode %s" filename)))
+    (let ((chmod "chmod"))
+      (when (and (eq flag 'nofollow) (file-symlink-p filename))
+       (or (setq chmod (tramp-get-remote-chmod-h v))
+           (tramp-error
+            v 'file-error "Cannot chmod %s with %s flag" filename flag)))
+      (tramp-flush-file-properties v localname)
+      ;; FIXME: extract the proper text from chmod's stderr.
+      (tramp-barf-unless-okay
+       v
+       (format "%s %o %s" chmod mode (tramp-shell-quote-argument localname))
+       "Error while changing file's mode %s" filename))))
 
 (defun tramp-sh-handle-set-file-times (filename &optional time)
   "Like `set-file-times' for Tramp files."
@@ -2280,7 +2284,7 @@ the uid and gid from FILENAME."
                      ;; We must change the ownership as local user.
                      ;; Since this does not work reliable, we also
                      ;; give read permissions.
-                     (set-file-modes tmpfile #o0777 'nofollow)
+                     (set-file-modes tmpfile #o0777)
                      (tramp-set-file-uid-gid
                       tmpfile
                       (tramp-get-remote-uid v 'integer)
@@ -3222,8 +3226,7 @@ STDERR can also be a file name."
                    (delete-file tmpfile2)))))
 
            ;; Set proper permissions.
-           (set-file-modes tmpfile (tramp-default-file-modes filename)
-                           'nofollow)
+           (set-file-modes tmpfile (tramp-default-file-modes filename))
            ;; Set local user ownership.
            (tramp-set-file-uid-gid tmpfile))
 
@@ -3272,7 +3275,8 @@ STDERR can also be a file name."
           #'write-region
           (list start end localname append 'no-message lockname))
 
-       (let* ((modes (save-excursion (tramp-default-file-modes filename)))
+       (let* ((modes (tramp-default-file-modes
+                      filename (and (eq mustbenew 'excl) 'nofollow)))
               ;; We use this to save the value of
               ;; `last-coding-system-used' after writing the tmp
               ;; file.  At the end of the function, we set
@@ -3322,7 +3326,7 @@ STDERR can also be a file name."
          ;; handles permissions.
          ;; Ensure that it is still readable.
          (when modes
-           (set-file-modes tmpfile (logior (or modes 0) #o0400) 'nofollow))
+           (set-file-modes tmpfile (logior (or modes 0) #o0400)))
 
          ;; This is a bit lengthy due to the different methods
          ;; possible for file transfer.  First, we check whether the
@@ -5897,6 +5901,22 @@ ID-FORMAT valid values are `string' and `integer'."
                vec (concat command " -A n </dev/null"))
               command)))))
 
+(defun tramp-get-remote-chmod-h (vec)
+  "Determine remote `chmod' command which supports nofollow argument."
+  (with-tramp-connection-property vec "chmod-h"
+    (tramp-message vec 5 "Finding a suitable `chmod' command with nofollow")
+    (let ((tmpfile
+          (make-temp-name
+           (expand-file-name
+            tramp-temp-name-prefix (tramp-get-remote-tmpdir vec)))))
+      (when (tramp-send-command-and-check
+            vec
+            (format
+             "ln -s foo %s && chmod -h %s 0777"
+             (tramp-file-local-name tmpfile) (tramp-file-local-name tmpfile)))
+       (delete-file tmpfile)
+       "chmod -h"))))
+
 (defun tramp-get-env-with-u-option (vec)
   "Check, whether the remote `env' command supports the -u option."
   (with-tramp-connection-property vec "env-u-option"
diff --git a/lisp/net/tramp-smb.el b/lisp/net/tramp-smb.el
index 95505ea..abd369f 100644
--- a/lisp/net/tramp-smb.el
+++ b/lisp/net/tramp-smb.el
@@ -1466,8 +1466,9 @@ component is used as the target of the symlink."
 
 (defun tramp-smb-handle-set-file-modes (filename mode &optional flag)
   "Like `set-file-modes' for Tramp files."
-  flag ;; FIXME: Support 'nofollow'.
   (with-parsed-tramp-file-name filename nil
+    (when (and (eq flag 'nofollow) (file-symlink-p filename))
+      (tramp-error v 'file-error "Cannot chmod %s with %s flag" filename flag))
     (when (tramp-smb-get-cifs-capabilities v)
       (tramp-flush-file-properties v localname)
       (unless (tramp-smb-send-command
diff --git a/lisp/net/tramp-sudoedit.el b/lisp/net/tramp-sudoedit.el
index 4654d63..e70ee4e 100644
--- a/lisp/net/tramp-sudoedit.el
+++ b/lisp/net/tramp-sudoedit.el
@@ -465,8 +465,9 @@ the result will be a local, non-Tramp, file name."
 
 (defun tramp-sudoedit-handle-set-file-modes (filename mode &optional flag)
   "Like `set-file-modes' for Tramp files."
-  flag ;; FIXME: Support 'nofollow'.
   (with-parsed-tramp-file-name filename nil
+    (when (and (eq flag 'nofollow) (file-symlink-p filename))
+      (tramp-error v 'file-error "Cannot chmod %s with %s flag" filename flag))
     (tramp-flush-file-properties v localname)
     (unless (tramp-sudoedit-send-command
             v "chmod" (format "%o" mode)
@@ -716,13 +717,14 @@ ID-FORMAT valid values are `string' and `integer'."
   (start end filename &optional append visit lockname mustbenew)
   "Like `write-region' for Tramp files."
   (with-parsed-tramp-file-name filename nil
-    (let ((uid (or (tramp-compat-file-attribute-user-id
-                   (file-attributes filename 'integer))
-                  (tramp-sudoedit-get-remote-uid v 'integer)))
-         (gid (or (tramp-compat-file-attribute-group-id
-                   (file-attributes filename 'integer))
-                  (tramp-sudoedit-get-remote-gid v 'integer)))
-         (modes (tramp-default-file-modes filename)))
+    (let* ((uid (or (tramp-compat-file-attribute-user-id
+                    (file-attributes filename 'integer))
+                   (tramp-sudoedit-get-remote-uid v 'integer)))
+          (gid (or (tramp-compat-file-attribute-group-id
+                    (file-attributes filename 'integer))
+                   (tramp-sudoedit-get-remote-gid v 'integer)))
+          (flag (and (eq mustbenew 'excl) 'nofollow))
+          (modes (tramp-default-file-modes filename flag)))
       (prog1
          (tramp-handle-write-region
           start end filename append visit lockname mustbenew)
@@ -736,8 +738,7 @@ ID-FORMAT valid values are `string' and `integer'."
                         (file-attributes filename 'integer))
                        gid))
           (tramp-set-file-uid-gid filename uid gid))
-       (set-file-modes filename modes
-                       (when (eq mustbenew 'excl) 'nofollow))))))
+       (tramp-compat-set-file-modes filename modes flag)))))
 
 
 ;; Internal functions.
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 64acaa9..c498f8c 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -2135,11 +2135,13 @@ For definition of that list see 
`tramp-set-completion-function'."
 (defvar tramp-devices 0
   "Keeps virtual device numbers.")
 
-(defun tramp-default-file-modes (filename)
+(defun tramp-default-file-modes (filename &optional flag)
   "Return file modes of FILENAME as integer.
-If the file modes of FILENAME cannot be determined, return the
-value of `default-file-modes', without execute permissions."
-  (or (file-modes filename)
+If optional FLAG is ‘nofollow’, do not follow FILENAME if it is a
+symbolic link.  If the file modes of FILENAME cannot be
+determined, return the value of `default-file-modes', without
+execute permissions."
+  (or (tramp-compat-file-modes filename flag)
       (logand (default-file-modes) #o0666)))
 
 (defun tramp-replace-environment-variables (filename)
@@ -3181,11 +3183,11 @@ User is always nil."
 
 (defun tramp-handle-file-modes (filename &optional flag)
   "Like `file-modes' for Tramp files."
-  (when-let ((attrs (file-attributes filename)))
-    (let ((mode-string (tramp-compat-file-attribute-modes attrs)))
-      (if (and (not flag) (eq ?l (aref mode-string 0)))
-         (tramp-handle-file-modes (file-chase-links filename) 'nofollow)
-       (tramp-mode-string-to-int mode-string)))))
+  (when-let ((attrs (file-attributes filename))
+            (mode-string (tramp-compat-file-attribute-modes attrs)))
+    (if (and (not (eq flag 'nofollow)) (eq ?l (aref mode-string 0)))
+       (file-modes (file-truename filename))
+      (tramp-mode-string-to-int mode-string))))
 
 ;; Localname manipulation functions that grok Tramp localnames...
 (defun tramp-handle-file-name-as-directory (file)
@@ -3879,7 +3881,8 @@ of."
       (tramp-error v 'file-already-exists filename))
 
     (let ((tmpfile (tramp-compat-make-temp-file filename))
-         (modes (save-excursion (tramp-default-file-modes filename))))
+         (modes (tramp-default-file-modes
+                 filename (and (eq mustbenew 'excl) 'nofollow))))
       (when (and append (file-exists-p filename))
        (copy-file filename tmpfile 'ok))
       ;; The permissions of the temporary file should be set.  If
@@ -3887,7 +3890,7 @@ of."
       ;; renamed to the backup file.  This case `save-buffer'
       ;; handles permissions.
       ;; Ensure that it is still readable.
-      (set-file-modes tmpfile (logior (or modes 0) #o0400) 'nofollow)
+      (set-file-modes tmpfile (logior (or modes 0) #o0400))
       ;; We say `no-message' here because we don't want the visited file
       ;; modtime data to be clobbered from the temp file.  We call
       ;; `set-visited-file-modtime' ourselves later on.
@@ -4667,7 +4670,7 @@ Return the local name of the temporary file."
          (setq result nil)
        ;; This creates the file by side effect.
        (set-file-times result)
-       (set-file-modes result #o0700 'nofollow)))
+       (set-file-modes result #o0700)))
 
     ;; Return the local part.
     (tramp-file-local-name result)))
diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index 9409cc2..7b43d6f 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -3082,14 +3082,18 @@ This tests also `file-directory-p' and 
`file-accessible-directory-p'."
 ;; Method "smb" supports `make-symbolic-link' only if the remote host
 ;; has CIFS capabilities.  tramp-adb.el, tramp-gvfs.el and
 ;; tramp-rclone.el do not support symbolic links at all.
+;; We check also `set-file-modes' with nofollow flag.
 (defmacro tramp--test-ignore-make-symbolic-link-error (&rest body)
   "Run BODY, ignoring \"make-symbolic-link not supported\" file error."
   (declare (indent defun) (debug (body)))
   `(condition-case err
        (progn ,@body)
      (file-error
-      (unless (string-equal (error-message-string err)
-                           "make-symbolic-link not supported")
+      (unless (string-match-p
+              (concat
+               "^\\(make-symbolic-link not supported"
+               "\\|Cannot chmod .* with nofollow flag\\)$")
+              (error-message-string err))
        (signal (car err) (cdr err))))))
 
 (ert-deftest tramp-test18-file-attributes ()
@@ -3364,25 +3368,69 @@ This tests also `file-executable-p', `file-writable-p' 
and `set-file-modes'."
         "ftp" (file-remote-p tramp-test-temporary-file-directory 'method)))))
 
   (dolist (quoted (if (tramp--test-expensive-test) '(nil t) '(nil)))
-    (let ((tmp-name (tramp--test-make-temp-name nil quoted)))
+    (let ((tmp-name1 (tramp--test-make-temp-name nil quoted))
+         (tmp-name2 (tramp--test-make-temp-name nil quoted)))
+
       (unwind-protect
          (progn
-           (write-region "foo" nil tmp-name)
-           (should (file-exists-p tmp-name))
-           (set-file-modes tmp-name #o777)
-           (should (= (file-modes tmp-name) #o777))
-           (should (file-executable-p tmp-name))
-           (should (file-writable-p tmp-name))
-           (set-file-modes tmp-name #o444)
-           (should (= (file-modes tmp-name) #o444))
-           (should-not (file-executable-p tmp-name))
+           (write-region "foo" nil tmp-name1)
+           (should (file-exists-p tmp-name1))
+           (set-file-modes tmp-name1 #o777)
+           (should (= (file-modes tmp-name1) #o777))
+           (should (file-executable-p tmp-name1))
+           (should (file-writable-p tmp-name1))
+           (set-file-modes tmp-name1 #o444)
+           (should (= (file-modes tmp-name1) #o444))
+           (should-not (file-executable-p tmp-name1))
            ;; A file is always writable for user "root".
            (unless (zerop (tramp-compat-file-attribute-user-id
-                           (file-attributes tmp-name)))
-             (should-not (file-writable-p tmp-name))))
+                           (file-attributes tmp-name1)))
+             (should-not (file-writable-p tmp-name1))))
 
        ;; Cleanup.
-       (ignore-errors (delete-file tmp-name))))))
+       (ignore-errors (delete-file tmp-name1)))
+
+      ;; Check the NOFOLLOW arg.  It exists since Emacs 28.
+      (when (tramp--test-emacs28-p)
+       (unwind-protect
+           (tramp--test-ignore-make-symbolic-link-error
+             (write-region "foo" nil tmp-name1)
+             (should (file-exists-p tmp-name1))
+             (make-symbolic-link tmp-name1 tmp-name2)
+             (should
+              (string-equal
+               (funcall
+                (if quoted #'tramp-compat-file-name-unquote #'identity)
+                (file-remote-p tmp-name1 'localname))
+               (file-symlink-p tmp-name2)))
+             ;; Both report the modes of `tmp-name1'.
+             (should
+              (= (file-modes tmp-name1) (file-modes tmp-name2)))
+             ;; `tmp-name1' is a regular file.  NOFOLLOW doesn't matter.
+             (should
+              (= (file-modes tmp-name1) (file-modes tmp-name1 'nofollow)))
+             ;; `tmp-name2' is a symbolic link.  It has different permissions.
+             (should-not
+              (= (file-modes tmp-name2) (file-modes tmp-name2 'nofollow)))
+             (should-not
+              (= (file-modes tmp-name1 'nofollow)
+                 (file-modes tmp-name2 'nofollow)))
+             ;; Change permissions.
+             (set-file-modes tmp-name1 #o200)
+             (set-file-modes tmp-name2 #o200)
+             (should
+              (= (file-modes tmp-name1) (file-modes tmp-name2) #o200))
+             ;; Change permissions with NOFOLLOW.
+             (set-file-modes tmp-name1 #o300 'nofollow)
+             (set-file-modes tmp-name2 #o300 'nofollow)
+             (should
+              (= (file-modes tmp-name1 'nofollow)
+                 (file-modes tmp-name2 'nofollow)))
+             (should-not (= (file-modes tmp-name1) (file-modes tmp-name2))))
+
+         ;; Cleanup.
+         (ignore-errors (delete-file tmp-name1))
+         (ignore-errors (delete-file tmp-name2)))))))
 
 ;; Method "smb" could run into "NT_STATUS_REVISION_MISMATCH" error.
 (defmacro tramp--test-ignore-add-name-to-file-error (&rest body)
@@ -4358,7 +4406,7 @@ This tests also `make-symbolic-link', `file-truename' and 
`add-name-to-file'."
              (while (accept-process-output proc 0 nil t)))
            ;; We cannot use `string-equal', because tramp-adb.el
            ;; echoes also the sent string.  And a remote macOS sends
-           ;; a slightly modified string. On MS-Windows,
+           ;; a slightly modified string.  On MS Windows,
            ;; `delete-process' sends an unknown signal.
            (should
             (string-match
@@ -5344,6 +5392,12 @@ Some semantics has been changed for there, w/o new 
functions or
 variables, so we check the Emacs version directly."
   (>= emacs-major-version 27))
 
+(defun tramp--test-emacs28-p ()
+  "Check for Emacs version >= 28.1.
+Some semantics has been changed for there, w/o new functions or
+variables, so we check the Emacs version directly."
+  (>= emacs-major-version 28))
+
 (defun tramp--test-adb-p ()
   "Check, whether the remote host runs Android.
 This requires restrictions of file name syntax."



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