Fix Bug#31489

* doc/misc/tramp.texi (Frequently Asked Questions):
Mention `tramp-ignored-file-name-regexp'.  Improve index.

; * etc/NEWS: Mention `tramp-ignored-file-name-regexp'.

* lisp/net/tramp.el (tramp-ignored-file-name-regexp): New defcustom.
(tramp-tramp-file-p): Use it.  Check also for `tramp-mode'.
(tramp-file-name-handler): Don't check for `tramp-mode'.  (Bug#31489)

* test/lisp/net/tramp-tests.el (tramp-test01-file-name-syntax):
Extend test.

1 files changed, 16 insertions, 0 deletions

diff --git a/doc/misc/tramp.texi b/doc/misc/tramp.texi
index 329c46bdaad..5dd1a2ca4ee 100644
--- a/doc/misc/tramp.texi
+++ b/doc/misc/tramp.texi
@@ -3994,6 +3994,7 @@ in @file{.emacs}:
 @end lisp
 
 @item
+@vindex tramp-mode
 To disable both @value{tramp} (and Ange FTP), set @code{tramp-mode} to
 @code{nil} in @file{.emacs}.  @strong{Note}, that we don't use
 @code{customize-set-variable}, in order to avoid loading @value{tramp}.
@@ -4003,6 +4004,21 @@ To disable both @value{tramp} (and Ange FTP), set @code{tramp-mode} to
 @end lisp
 
 @item
+@vindex tramp-ignored-file-name-regexp
+To deactivate @value{tramp} for some look-alike remote file names, set
+@code{tramp-ignored-file-name-regexp} to a proper regexp in
+@file{.emacs}.  @strong{Note}, that we don't use
+@code{customize-set-variable}, in order to avoid loading
+@value{tramp}.
+
+@lisp
+(setq tramp-ignored-file-name-regexp "\\`/ssh:example\\.com:")
+@end lisp
+
+This is needed, if you mount for example a virtual file system on your
+local host's root directory as @file{/ssh:example.com:}.
+
+@item
 To unload @value{tramp}, type @kbd{M-x tramp-unload-tramp @key{RET}}.
 Unloading @value{tramp} resets Ange FTP plugins also.
 @end itemize