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Subject: bug#78508: Tramp confused by bracketed paste after remote prompt
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When the remote shell emits bracketed paste escape codes (as zsh does
even when TERM=dumb), tramp ends up timing out unable to find the shell
prompt on initial connection.

BTW: is there any particular reason that sshx uses RemoteCommand but ssh
method does not?

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To: Daniel Colascione <dancol@HIDDEN>
Subject: bug#78508: Acknowledgement (Tramp confused by bracketed paste
 after remote prompt)
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Subject: bug#78508: Tramp confused by bracketed paste after remote prompt
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--=-=-=
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Daniel Colascione <dancol@HIDDEN> writes:

Hi Daniel,

> When the remote shell emits bracketed paste escape codes (as zsh does
> even when TERM=3Ddumb), tramp ends up timing out unable to find the shell
> prompt on initial connection.

Have you checked the recipe from the Tramp manual in (info "(tramp)
Frequently Asked Questions") ?

--8<---------------cut here---------------start------------->8---
          When using zsh on remote hosts, disable zsh line editor
          because zsh uses left-hand side and right-hand side prompts in
          parallel.  Add the following line to =E2=80=98~/.zshrc=E2=80=99:

               [[ $TERM =3D=3D "dumb" ]] && unsetopt zle && PS1=3D'$ ' && r=
eturn

          This uses the default value of =E2=80=98tramp-terminal-type=E2=80=
=99, "dumb",
          as value of the =E2=80=98TERM=E2=80=99 environment variable.  If =
you want to
          use another value for =E2=80=98TERM=E2=80=99, change =E2=80=98tra=
mp-terminal-type=E2=80=99 and
          this line accordingly.
--8<---------------cut here---------------end--------------->8---

Note, that until recently TERM wasn't set properly initially, when
calling ssh. I have a WIP patch for this (being under regression test
for some days), see appended. Does this help?

> BTW: is there any particular reason that sshx uses RemoteCommand but ssh
> method does not?

Yes: They are different methods, and they are designed for this
difference. For example, using RemoteCommand disables direct async
processes for sshx connections.

Best regards, Michael.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment

diff --git a/lisp/tramp-sh.el b/lisp/tramp-sh.el
index 64ad3d49..648b2e13 100644
--- a/lisp/tramp-sh.el
+++ b/lisp/tramp-sh.el
@@ -190,7 +190,10 @@ The string is used in `tramp-methods'.")
               `("scp"
                 (tramp-login-program        "ssh")
                 (tramp-login-args           (("-l" "%u") ("-p" "%p") ("%c")
-				             ("-e" "none") ("%h")))
+					     ("-e" "none")
+				             ("-o" ,(format "SetEnv=\"TERM=%s\""
+							    tramp-terminal-type))
+					     ("%h")))
                 (tramp-async-args           (("-q")))
 		(tramp-direct-async         ("-t" "-t"))
                 (tramp-remote-shell         ,tramp-default-remote-shell)
@@ -208,6 +211,8 @@ The string is used in `tramp-methods'.")
                 (tramp-login-args           (("-l" "%u") ("-p" "%p") ("%c")
 				             ("-e" "none") ("-t" "-t")
 					     ("-o" "RemoteCommand=\"%l\"")
+				             ("-o" ,(format "SetEnv=\"TERM=%s\""
+							    tramp-terminal-type))
 					     ("%h")))
                 (tramp-async-args           (("-q")))
                 (tramp-remote-shell         ,tramp-default-remote-shell)
@@ -223,7 +228,10 @@ The string is used in `tramp-methods'.")
               `("rsync"
                 (tramp-login-program        "ssh")
                 (tramp-login-args           (("-l" "%u") ("-p" "%p") ("%c")
-				             ("-e" "none") ("%h")))
+				             ("-e" "none")
+				             ("-o" ,(format "SetEnv=\"TERM=%s\""
+							    tramp-terminal-type))
+					     ("%h")))
                 (tramp-async-args           (("-q")))
                 (tramp-direct-async         t)
                 (tramp-remote-shell         ,tramp-default-remote-shell)
@@ -254,7 +262,10 @@ The string is used in `tramp-methods'.")
               `("ssh"
                 (tramp-login-program        "ssh")
                 (tramp-login-args           (("-l" "%u") ("-p" "%p") ("%c")
-				             ("-e" "none") ("%h")))
+				             ("-e" "none")
+				             ("-o" ,(format "SetEnv=\"TERM=%s\""
+							    tramp-terminal-type))
+					     ("%h")))
                 (tramp-async-args           (("-q")))
 		(tramp-direct-async         ("-t" "-t"))
                 (tramp-remote-shell         ,tramp-default-remote-shell)
@@ -265,6 +276,8 @@ The string is used in `tramp-methods'.")
                 (tramp-login-program        "ssh")
                 (tramp-login-args           (("-l" "%u") ("-p" "%p") ("%c")
 				             ("-e" "none") ("-t" "-t")
+				             ("-o" ,(format "SetEnv=\"TERM=%s\""
+							    tramp-terminal-type))
 					     ("-o" "RemoteCommand=\"%l\"")
 					     ("%h")))
                 (tramp-async-args           (("-q")))
@@ -301,6 +314,7 @@ The string is used in `tramp-methods'.")
                 ;; remote host echoes the command.
 		;; The "-p" argument doesn't work reliably, see Bug#50594.
                 (tramp-login-args           (("SUDO_PROMPT=P\"\"a\"\"s\"\"s\"\"w\"\"o\"\"r\"\"d\"\":")
+                                             (,(format "TERM=%s" tramp-terminal-type))
                                              ("sudo") ("-u" "%u") ("-s") ("-H")
 				             ("%l")))
                 (tramp-remote-shell         ,tramp-default-remote-shell)
@@ -4271,7 +4285,7 @@ file exists and nonzero exit status otherwise."
     (tramp-send-command
      vec (format
 	  (concat
-	   "exec env TERM='%s' INSIDE_EMACS='%s' "
+	   "env; exec env TERM='%s' INSIDE_EMACS='%s' "
 	   "ENV=%s %s PROMPT_COMMAND='' PS1=%s PS2='' PS3='' %s %s -i")
           tramp-terminal-type (tramp-inside-emacs)
           (or (getenv-internal "ENV" tramp-remote-process-environment) "")

--=-=-=--

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Subject: bug#78508: Tramp confused by bracketed paste after remote prompt
Resent-From: Daniel Colascione <dancol@HIDDEN>
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From: Daniel Colascione <dancol@HIDDEN>
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On May 21, 2025 3:35:10 AM EDT, Michael Albinus <michael=2Ealbinus@gmx=2Ed=
e> wrote:
>Daniel Colascione <dancol@dancol=2Eorg> writes:
>
>Hi Daniel,
>
>> When the remote shell emits bracketed paste escape codes (as zsh does
>> even when TERM=3Ddumb), tramp ends up timing out unable to find the she=
ll
>> prompt on initial connection=2E
>
>Have you checked the recipe from the Tramp manual in (info "(tramp)
>Frequently Asked Questions") ?

It shouldn't be necessary to do that=2E Sometimes modifying the target sys=
tem isn't all that straightforward, and control sequences should be straigh=
tforward to strip=2E There's already an attempt to strip ANSI color, yes? I=
t's not like Tramp is trying to avail itself of the opportunities SSH provi=
des to make noninteractive use feasible=2E Failure mode is just "when I try=
 to use Emacs to connect to this family of hosts, it hangs=2E VSCode works=
=2E I guess I'll stick with that"=20

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From: Michael Albinus <michael.albinus@HIDDEN>
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Date: Thu, 22 May 2025 13:25:47 +0200
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Daniel Colascione <dancol@HIDDEN> writes:

Hi Daniel,

>>> When the remote shell emits bracketed paste escape codes (as zsh does
>>> even when TERM=dumb), tramp ends up timing out unable to find the shell
>>> prompt on initial connection.
>>
>>Have you checked the recipe from the Tramp manual in (info "(tramp)
>>Frequently Asked Questions") ?
>
> It shouldn't be necessary to do that. Sometimes modifying the target
> system isn't all that straightforward, and control sequences should be
> straightforward to strip. There's already an attempt to strip ANSI
> color, yes? It's not like Tramp is trying to avail itself of the
> opportunities SSH provides to make noninteractive use feasible.

Tramp won't go into the prompt parsing business. Filtering ANSI color
sequences out was a compromise a while ago. You let feel me that it was
an error to do so.

> Failure mode is just "when I try to use Emacs to connect to
> this family of hosts, it hangs. VSCode works. I guess I'll stick with
> that"

That's unfair, and you know it.

Have you tried the patch I've shown?

Best regards, Michael.

Last modified: Thu, 22 May 2025 11:30:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.