Some minor Tramp cleanups

* lisp/net/tramp-adb.el (tramp-adb-file-name-p):
* lisp/net/tramp-ftp.el (tramp-ftp-file-name-p):
* lisp/net/tramp-smb.el (tramp-smb-file-name-p): Make it more robust.

* lisp/net/tramp.el (tramp-handle-file-truename): Cache only the
localname.

5 files changed, 38 insertions, 32 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 36374f88e0d..00c6ad43ea1 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -173,8 +173,9 @@ It is used for TCP/IP devices."
 ;;;###tramp-autoload
 (defsubst tramp-adb-file-name-p (filename)
   "Check if it's a filename for ADB."
-  (let ((v (tramp-dissect-file-name filename)))
-    (string= (tramp-file-name-method v) tramp-adb-method)))
+  (and (tramp-tramp-file-p filename)
+       (string= (tramp-file-name-method (tramp-dissect-file-name filename))
+		tramp-adb-method)))
 
 ;;;###tramp-autoload
 (defun tramp-adb-file-name-handler (operation &rest args)
diff --git a/lisp/net/tramp-ftp.el b/lisp/net/tramp-ftp.el
index 983f168ddb4..5d8b56e218f 100644
--- a/lisp/net/tramp-ftp.el
+++ b/lisp/net/tramp-ftp.el
@@ -183,8 +183,9 @@ pass to the OPERATION."
 ;;;###tramp-autoload
 (defsubst tramp-ftp-file-name-p (filename)
   "Check if it's a filename that should be forwarded to Ange-FTP."
-  (string= (tramp-file-name-method (tramp-dissect-file-name filename))
-	   tramp-ftp-method))
+  (and (tramp-tramp-file-p filename)
+       (string= (tramp-file-name-method (tramp-dissect-file-name filename))
+		tramp-ftp-method)))
 
 ;;;###tramp-autoload
 (add-to-list 'tramp-foreign-file-name-handler-alist
diff --git a/lisp/net/tramp-gvfs.el b/lisp/net/tramp-gvfs.el
index c150edf3f13..fb687f0d7bd 100644
--- a/lisp/net/tramp-gvfs.el
+++ b/lisp/net/tramp-gvfs.el
@@ -2088,7 +2088,7 @@ This uses \"avahi-browse\" in case D-Bus is not enabled in Avahi."
 ;;; TODO:
 
 ;; * (Customizable) unmount when exiting Emacs.  See tramp-archive.el.
-
+;;
 ;; * Host name completion for existing mount points (afp-server,
 ;;   smb-server, google-drive, nextcloud) or via smb-network or network.
 ;;
diff --git a/lisp/net/tramp-smb.el b/lisp/net/tramp-smb.el
index a97b8017300..eadb4029b54 100644
--- a/lisp/net/tramp-smb.el
+++ b/lisp/net/tramp-smb.el
@@ -321,8 +321,9 @@ This can be used to disable echo etc."
 ;;;###tramp-autoload
 (defsubst tramp-smb-file-name-p (filename)
   "Check if it's a filename for SMB servers."
-  (string= (tramp-file-name-method (tramp-dissect-file-name filename))
-	   tramp-smb-method))
+  (and (tramp-tramp-file-p filename)
+       (string= (tramp-file-name-method (tramp-dissect-file-name filename))
+		tramp-smb-method)))
 
 ;;;###tramp-autoload
 (defun tramp-smb-file-name-handler (operation &rest args)
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 8362d787525..97f931a4a44 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -3301,31 +3301,34 @@ User is always nil."
 	 (numchase-limit 20)
 	 symlink-target)
      (with-parsed-tramp-file-name result v1
-       (with-tramp-file-property v1 v1-localname "file-truename"
-	 (while (and (setq symlink-target (file-symlink-p result))
-		     (< numchase numchase-limit))
-	   (setq numchase (1+ numchase)
-		 result
-		 (with-parsed-tramp-file-name (expand-file-name result) v2
-		   (tramp-make-tramp-file-name
-		    v2
-		    (funcall
-		     (if (tramp-compat-file-name-quoted-p v2-localname)
-			 'tramp-compat-file-name-quote 'identity)
-
-		     (if (stringp symlink-target)
-			 (if (file-remote-p symlink-target)
-			     (let (file-name-handler-alist)
-			       (tramp-compat-file-name-quote symlink-target))
-			   (expand-file-name
-			    symlink-target (file-name-directory v2-localname)))
-		       v2-localname))
-		    'nohop)))
-	   (when (>= numchase numchase-limit)
-	     (tramp-error
-	      v1 'file-error
-	      "Maximum number (%d) of symlinks exceeded" numchase-limit)))
-	 (directory-file-name result))))))
+       ;; We cache only the localname.
+       (tramp-make-tramp-file-name
+	v1
+	(with-tramp-file-property v1 v1-localname "file-truename"
+	  (while (and (setq symlink-target (file-symlink-p result))
+		      (< numchase numchase-limit))
+	    (setq numchase (1+ numchase)
+		  result
+		  (with-parsed-tramp-file-name (expand-file-name result) v2
+		    (tramp-make-tramp-file-name
+		     v2
+		     (funcall
+		      (if (tramp-compat-file-name-quoted-p v2-localname)
+			  'tramp-compat-file-name-quote 'identity)
+
+		      (if (stringp symlink-target)
+			  (if (file-remote-p symlink-target)
+			      (let (file-name-handler-alist)
+				(tramp-compat-file-name-quote symlink-target))
+			    (expand-file-name
+			     symlink-target (file-name-directory v2-localname)))
+			v2-localname))
+		     'nohop)))
+	    (when (>= numchase numchase-limit)
+	      (tramp-error
+	       v1 'file-error
+	       "Maximum number (%d) of symlinks exceeded" numchase-limit)))
+	  (file-local-name (directory-file-name result))))))))
 
 (defun tramp-handle-find-backup-file-name (filename)
   "Like `find-backup-file-name' for Tramp files."