Improve Tramp error handling

* lisp/net/tramp.el (tramp-set-syntax): Add missing argument.
(tramp-signal-hook-function): Make it more robust.
(tramp-handle-directory-files):
* lisp/net/tramp-adb.el
(tramp-adb-handle-directory-files-and-attributes)
(tramp-adb-handle-copy-file, tramp-adb-handle-rename-file):
* lisp/net/tramp-gvfs.el (tramp-gvfs-do-copy-or-rename-file):
* lisp/net/tramp-rclone.el (tramp-rclone-do-copy-or-rename-file)
(tramp-rclone-handle-directory-files):
* lisp/net/tramp-sh.el (tramp-sh-handle-directory-files-and-attributes)
(tramp-sh-handle-copy-directory, tramp-do-copy-or-rename-file):
* lisp/net/tramp-smb.el (tramp-smb-handle-copy-directory)
(tramp-smb-handle-copy-file, tramp-smb-handle-directory-files)
(tramp-smb-handle-rename-file):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-do-copy-or-rename-file):
Improve error handling.

* test/lisp/net/tramp-tests.el (tramp-test11-copy-file)
(tramp-test12-rename-file, tramp-test14-delete-directory)
(tramp-test15-copy-directory, tramp-test16-directory-files)
(tramp-test19-directory-files-and-attributes): Extend tests.

7 files changed, 70 insertions, 3 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index e1706bebe6e..e3098190e2b 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -383,6 +383,10 @@ ARGUMENTS to pass to the OPERATION."
 (defun tramp-adb-handle-directory-files-and-attributes
   (directory &optional full match nosort id-format)
   "Like `directory-files-and-attributes' for Tramp files."
+  (unless (file-exists-p directory)
+    (tramp-error
+     (tramp-dissect-file-name directory) tramp-file-missing
+     "No such file or directory" directory))
   (when (file-directory-p directory)
     (with-parsed-tramp-file-name (expand-file-name directory) nil
       (copy-tree
@@ -706,6 +710,10 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
     (let ((t1 (tramp-tramp-file-p filename))
           (t2 (tramp-tramp-file-p newname)))
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing
+           "Copying file" "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
@@ -784,6 +792,10 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
     (let ((t1 (tramp-tramp-file-p filename))
           (t2 (tramp-tramp-file-p newname)))
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing
+           "Renaming file" "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
diff --git a/lisp/net/tramp-gvfs.el b/lisp/net/tramp-gvfs.el
index c08c7194cc7..6f5cade4c63 100644
--- a/lisp/net/tramp-gvfs.el
+++ b/lisp/net/tramp-gvfs.el
@@ -765,6 +765,10 @@ file names."
           (msg-operation (if (eq op 'copy) "Copying" "Renaming")))
 
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing
+           "%s file" msg-operation "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
diff --git a/lisp/net/tramp-rclone.el b/lisp/net/tramp-rclone.el
index 1f0c7eadbc5..2b3799ef008 100644
--- a/lisp/net/tramp-rclone.el
+++ b/lisp/net/tramp-rclone.el
@@ -213,6 +213,10 @@ file names."
           (msg-operation (if (eq op 'copy) "Copying" "Renaming")))
 
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing
+           "%s file" msg-operation "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
@@ -298,6 +302,10 @@ file names."
 (defun tramp-rclone-handle-directory-files
     (directory &optional full match nosort)
   "Like `directory-files' for Tramp files."
+  (unless (file-exists-p directory)
+    (tramp-error
+     (tramp-dissect-file-name directory) tramp-file-missing
+     "No such file or directory" directory))
   (when (file-directory-p directory)
     (setq directory (file-name-as-directory (expand-file-name directory)))
     (with-parsed-tramp-file-name directory nil
diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 3c80c583099..be531ed3192 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -1713,6 +1713,10 @@ of."
   (directory &optional full match nosort id-format)
   "Like `directory-files-and-attributes' for Tramp files."
   (unless id-format (setq id-format 'integer))
+  (unless (file-exists-p directory)
+    (tramp-error
+     (tramp-dissect-file-name directory) tramp-file-missing
+     "No such file or directory" directory))
   (when (file-directory-p directory)
     (setq directory (expand-file-name directory))
     (let* ((temp
@@ -1923,6 +1927,10 @@ tramp-sh-handle-file-name-all-completions: internal error accessing `%s': `%s'"
   (let ((t1 (tramp-tramp-file-p dirname))
         (t2 (tramp-tramp-file-p newname)))
     (with-parsed-tramp-file-name (if t1 dirname newname) nil
+      (unless (file-exists-p dirname)
+        (tramp-error
+         v tramp-file-missing
+         "Copying directory" "No such file or directory" dirname))
       (if (and (not copy-contents)
                (tramp-get-method-parameter v 'tramp-copy-recursive)
                ;; When DIRNAME and NEWNAME are remote, they must have
@@ -2011,6 +2019,9 @@ file names."
                            (apply #'file-extended-attributes (list filename)))))
 
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
diff --git a/lisp/net/tramp-smb.el b/lisp/net/tramp-smb.el
index 5e52b26e7c6..f87d4becfe0 100644
--- a/lisp/net/tramp-smb.el
+++ b/lisp/net/tramp-smb.el
@@ -415,6 +415,10 @@ pass to the OPERATION."
       (with-parsed-tramp-file-name (if t1 dirname newname) nil
         (with-tramp-progress-reporter
             v 0 (format "Copying %s to %s" dirname newname)
+          (unless (file-exists-p dirname)
+            (tramp-error
+             v tramp-file-missing
+             "Copying directory" "No such file or directory" dirname))
           (when (and (file-directory-p newname)
                      (not (tramp-compat-directory-name-p newname)))
             (tramp-error v 'file-already-exists newname))
@@ -570,6 +574,13 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
     (if (file-directory-p filename)
         (copy-directory filename newname keep-date 'parents 'copy-contents)
 
+      (unless (file-exists-p filename)
+        (tramp-error
+         (tramp-dissect-file-name
+          (if (tramp-tramp-file-p filename) filename newname))
+         tramp-file-missing
+         "Copying file" "No such file or directory" filename))
+
       (let ((tmpfile (file-local-copy filename)))
         (if tmpfile
             ;; Remote filename.
@@ -669,6 +680,10 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 (defun tramp-smb-handle-directory-files
   (directory &optional full match nosort)
   "Like `directory-files' for Tramp files."
+  (unless (file-exists-p directory)
+    (tramp-error
+     (tramp-dissect-file-name directory) tramp-file-missing
+     "No such file or directory" directory))
   (let ((result (mapcar #'directory-file-name
                         (file-name-all-completions "" directory))))
     ;; Discriminate with regexp.
@@ -1333,6 +1348,10 @@ component is used as the target of the symlink."
 
   (with-parsed-tramp-file-name
       (if (tramp-tramp-file-p filename) filename newname) nil
+    (unless (file-exists-p filename)
+      (tramp-error
+       v tramp-file-missing
+       "Renaming file" "No such file or directory" filename))
     (when (and (not ok-if-already-exists) (file-exists-p newname))
       (tramp-error v 'file-already-exists newname))
     (when (and (file-directory-p newname)
diff --git a/lisp/net/tramp-sudoedit.el b/lisp/net/tramp-sudoedit.el
index bfc9b3bdc3a..2d9d7ff7892 100644
--- a/lisp/net/tramp-sudoedit.el
+++ b/lisp/net/tramp-sudoedit.el
@@ -241,6 +241,10 @@ absolute file names."
           (msg-operation (if (eq op 'copy) "Copying" "Renaming")))
 
       (with-parsed-tramp-file-name (if t1 filename newname) nil
+        (unless (file-exists-p filename)
+          (tramp-error
+           v tramp-file-missing
+           "%s file" msg-operation "No such file or directory" filename))
         (when (and (not ok-if-already-exists) (file-exists-p newname))
           (tramp-error v 'file-already-exists newname))
         (when (and (file-directory-p newname)
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 21b6f0070f7..88ff36d98ea 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -719,7 +719,7 @@ Used in user option `tramp-syntax'.  There are further variables
 to be set, depending on VALUE."
   ;; Check allowed values.
   (unless (memq value (tramp-syntax-values))
-    (tramp-user-error "Wrong `tramp-syntax' %s" value))
+    (tramp-user-error nil "Wrong `tramp-syntax' %s" value))
   ;; Cleanup existing buffers.
   (unless (eq (symbol-value symbol) value)
     (tramp-cleanup-all-buffers))
@@ -1889,8 +1889,13 @@ the resulting error message."
 ;; This function provides traces in case of errors not triggered by
 ;; Tramp functions.
 (defun tramp-signal-hook-function (error-symbol data)
-  "Funtion to be called via `signal-hook-function'."
-  (tramp-error (car tramp-current-connection) error-symbol "%s" data))
+  "Function to be called via `signal-hook-function'."
+  ;; `custom-initialize-*' functions provoke `void-variable' errors.
+  ;; We don't want to see them in the backtrace.
+  (unless (eq error-symbol 'void-variable)
+    (tramp-error
+     (car tramp-current-connection) error-symbol
+     "%s" (mapconcat (lambda (x) (format "%s" x)) data " "))))
 
 (defmacro with-parsed-tramp-file-name (filename var &rest body)
   "Parse a Tramp filename and make components available in the body.
@@ -3025,6 +3030,10 @@ User is always nil."
 
 (defun tramp-handle-directory-files (directory &optional full match nosort)
   "Like `directory-files' for Tramp files."
+  (unless (file-exists-p directory)
+    (tramp-error
+     (tramp-dissect-file-name directory) tramp-file-missing
+     "No such file or directory" directory))
   (when (file-directory-p directory)
     (setq directory (file-name-as-directory (expand-file-name directory)))
     (let ((temp (nreverse (file-name-all-completions "" directory)))