Re: emacs tramp hangs

[Michael Albinus]

glen <address@hidden> writes:

Hi Jacky,

> It hangs after tramp-send-command(),  tramp-wait-for-output().
> It seems that the emacs-tramp can't detect the output of remote command.
>
> See the attached file for more details.
>
> Any ideas?

Your shell prompt doesn't look Tramp affin, there are escape sequences:

> 18:10:54.192196 tramp-send-command (6) # exec ssh -l jacky  -o 
> ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none 
> 192.168.98.76
> 18:10:59.920689 tramp-process-actions (6) #
> Password:
> Last login: Fri Jun 16 18:08:04 2017 from 192.18.8.8
> [?1034hCopyright(c) 2005-2011, QiZhi Technologies. All Rights Reserved.
> License granted to Hze Co., Ltd, from 2015-03-09 to 2037-12-31.
>
>
> Selected group: linshi
>
> Selected server: 72.2.96.9 (72.2.96.9)
>
> Selected account: root
>
> ]0;address@hidden - SHTERM
> SHTERM 2.6.3-35fa58f3
> Copyright (c) 2005-2011, QiZhi Technologies. All Rights Reserved.
> License granted to Hze Co., Ltd.
> Valid from 2015-03-09 to 2037-12-31.
> Last login: Fri Jun 16 18:08:08 2017 from 172.22.215.224
> ]0;address@hidden:address@hidden ~]#

The login has worked successfully, despite the escape sequences.

> 18:10:59.923488 tramp-send-command (6) # exec env TERM='xterm' ENV='' 
> HISTFILE=~/.tramp_history PROMPT_COMMAND='' PS1=\#\$\  PS2='' PS3='' /bin/sh
> 18:12:24.347680 tramp-open-shell (5) # Opening remote shell 
> €˜/bin/sh€™...failed

This command has failed. Even no output in the buffer.

I recommend to suppress the escape sequences in your shell prompt, see
the Tramp manual for hints how to do this.

> PS: what's meaning of regex:  "[^#$\n]*%s\r?$"?

It's part of the `format' clause to determine the shell prompt; %s is
replaced by the value of `tramp-end-of-output'. In your case, this
variable should be "#$ ". Later on, once the connection has been
established, `tramp-end-of-output' is a random string like
"///e90c02f62ec0d7a2f6da0b67a20f8264#$".

> Jacky Wang

Best regards, Michael.