GNU bug report logs - #14808
24.3; Tramp hangs on unmatched prompt pattern

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Chris Thompson <teaforthecat <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; Tramp hangs on unmatched prompt pattern
Date: Sat, 06 Jul 2013 17:10:24 -0500

Feature: warn when the root prompt does not match tramp-prompt-pattern

Given an account on a remote server with the same name
And a password-less login to that account
And a /root/.bashrc has PS1 set to "\W:"
When I open a file "/sudo:/etc/passwd"
Then I should see a warning 'timeout after 5 seconds, prompt not recognized: "/etc:"'

Currently tramp will hang for a long time waiting for a prompt. I would
be helpful if the user was informed as to what tramp is seeing, then the
problem would be more easily addressed. In the case above the solution
is to edit the value of tramp-shell-prompt-pattern, but that solution is
not obvious. It sems like it could be made obvious with a little more
output from tramp if say a timeout is reached waiting for the prompt.

Thanks!
--
Chris






In GNU Emacs 24.3.1 (x86_64-apple-darwin12.3.0, NS apple-appkit-1187.37)
 of 2013-05-06 on Chriss-MacBook-Pro.local
Windowing system distributor `Apple', version 10.3.1187
Configured using:
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 '--enable-locallisppath=/usr/local/share/emacs/site-lisp'
 '--infodir=/usr/local/Cellar/emacs/24.3/share/info/emacs' '--with-ns'
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M-c M-c M-c C-SPC M-t M-t M-t C-r M-c M-c M-c M-h <return> 
; ; SPC d e f a u l t : M-t M-t M-t M-n M-n M-n M-n 
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<backspace> <backspace> <backspace> w e b 1 - e <tab> 
<return> M-a C-g C-x C-f C-g M-a s u d o - r e o <tab> 
<return> M-a s o d o <backspace> <backspace> <backspace> 
u d o - <tab> f i n - f i <tab> <return> a d m <return> 
c <return> <return> C-g C-g M-o m e s <return> M-c 
M-c M-c M-c M-H C-SPC M-t M-t M-t C-g M-m M-o SPC <return> 
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m a c s - b u <tab> <backspace> <backspace> <backspace> 
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Message #8 received at 14808 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chris Thompson <teaforthecat <at> gmail.com>
Cc: 14808 <at> debbugs.gnu.org
Subject: Re: bug#14808: 24.3; Tramp hangs on unmatched prompt pattern
Date: Tue, 09 Jul 2013 15:50:42 +0200

Chris Thompson <teaforthecat <at> gmail.com> writes:

> It sems like it could be made obvious with a little more output from
> tramp if say a timeout is reached waiting for the prompt.

Tramp has already such a function `tramp-error-with-buffer', which ought
to provide such information. It does not seem to work robustly under all
circumstances; I'm working on this.

Another problem is, that Tramp is just a library. That means, if you
want to open a file, several Tramp functions are called independently,
each of it requires an established connection. There must be a mechanism
that during a given timespan (let's say 5 seconds) Tramp does not try to
reconnect after a failed connection attempt. This works already in some
special cases; I'll improve this as well.

> Thanks!
> --
> Chris

Best regards, Michael.

Message #11 received at 14808 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chris Thompson <teaforthecat <at> gmail.com>
Cc: 14808 <at> debbugs.gnu.org
Subject: Re: bug#14808: 24.3; Tramp hangs on unmatched prompt pattern
Date: Wed, 10 Jul 2013 17:01:50 +0200

Chris Thompson <teaforthecat <at> gmail.com> writes:

> Feature: warn when the root prompt does not match tramp-prompt-pattern

I have committed a patch to the Tramp and Emacs repositories, which
should improve the messages. You could test it.

> Given an account on a remote server with the same name
> And a password-less login to that account
> And a /root/.bashrc has PS1 set to "\W:"
> When I open a file "/sudo:/etc/passwd"
> Then I should see a warning 'timeout after 5 seconds, prompt not
> recognized: "/etc:"'

The timeouts used by Tramp are unique for all different connection
methods (60 seconds). I will change it for the different methods; a
timeout for sudo could be much smaller. Keeping this report open until
this is fixed.

> Thanks!
> --
> Chris

Best regards, Michael.

Message #14 received at 14808 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chris Thompson <teaforthecat <at> gmail.com>
Cc: 14808 <at> debbugs.gnu.org
Subject: Re: bug#14808: 24.3; Tramp hangs on unmatched prompt pattern
Date: Thu, 11 Jul 2013 12:01:32 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

>> Given an account on a remote server with the same name
>> And a password-less login to that account
>> And a /root/.bashrc has PS1 set to "\W:"
>> When I open a file "/sudo:/etc/passwd"
>> Then I should see a warning 'timeout after 5 seconds, prompt not
>> recognized: "/etc:"'
>
> The timeouts used by Tramp are unique for all different connection
> methods (60 seconds). I will change it for the different methods; a
> timeout for sudo could be much smaller. Keeping this report open until
> this is fixed.

Should be fixed now by another patch I have committed. su-like
connection methods have a timeout of 10 seconds now.

Could you, please, check whether the patches fit your expectations? You
could use either Emacs development version, or Tramp from its git
repository with your Emacs 24.3.

>> Thanks!
>> --
>> Chris

Best regards, Michael.

Message #19 received at 14808-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chris Thompson <teaforthecat <at> gmail.com>
Cc: 14808-done <at> debbugs.gnu.org
Subject: Re: bug#14808: 24.3; Tramp hangs on unmatched prompt pattern
Date: Mon, 15 Jul 2013 14:15:59 +0200

Chris Thompson <teaforthecat <at> gmail.com> writes:

Hi Chris,

> I successfully replicated your work. I see the message in the
> minibuffer:

[...]

That's the intention of my change. You shall get more information where
to look for.

> The value of tramp-shell-prompt-pattern:
> "\\(?:^\\|\n \\)[^]#$%>\n]*#?[]#$%>] *\\(\\[[0-9;]*[a-zA-Z] *\\)*"
>
> When I add a colon to the list of ending characters in that regex,
> which would be #:$%>, then opening the file with sudo works
> beautifully. (because of the PS1 value which is set in
> .../root/.bashrc) 

We have kept out the trailing colon in `tramp-shell-prompt-pattern',
because often you get information or requests during login with such a
trailing colon, which should not be recognized as prompt. Like this:

Password:

So from my pov, this bug is resolved. I recommend you to use a prompt
w/o a trailing colon. Or you modify `tramp-shell-prompt-pattern', as you
have done.

> Thanks,
> Chris

Best regards, Michael.

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