M-x shell fails in tramp buffer

M-x shell fails in tramp buffer

[Chris Moore]

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In GNU Emacs 22.1.50.8 (i686-pc-linux-gnu, GTK+ Version 2.10.11)
 of 2007-08-21 on trpaslik
Windowing system distributor `The X.Org Foundation', version 11.0.70200000
configured using `configure  '--with-gtk' '--prefix' '/usr/local'
'--with-xpm' '--with-jpeg' '--with-png' '--with-gif''

Visit some FTP site:

  "C-x d /anonymous@ftp.gnu.org:/ RET"

Then try running a shell:

  "M-x shell RET"

I see a backtrace:

Debugger entered--Lisp error: (wrong-type-argument processp nil)
  process-coding-system(nil)
  comint-exec-1("shell" #<buffer *shell*> "/bin/bash" ("--noediting" "-i"))
  comint-exec(#<buffer *shell*> "shell" "/bin/bash" nil ("--noediting"
"-i"))
  make-comint-in-buffer("shell" #<buffer *shell*> "/bin/bash" nil
"--noediting" "-i")
  apply(make-comint-in-buffer "shell" #<buffer *shell*> "/bin/bash" nil
("--noediting" "-i"))
  shell(nil)
  call-interactively(shell)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)


I think I may have seen and reported this before - it does look familiar.

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Re: M-x shell fails in tramp buffer

[Michael Albinus]

"Chris Moore" <dooglus@gmail.com> writes:

> Visit some FTP site:
>
>   "C-x d /anonymous@ftp.gnu.org:/ RET"
>
> Then try running a shell:
>
>   "M-x shell RET"
>
> I see a backtrace:
>
> Debugger entered--Lisp error: (wrong-type-argument processp nil)
>   process-coding-system(nil)
>   comint-exec-1("shell" #<buffer *shell*> "/bin/bash" ("--noediting" "-i"))

comint-exec-1 uses start-file-process now, which starts a process
depending on the file name handler responsible for default-directory.
ange-ftp is not able to start a process; it always returns nil for
start-file-process.

I've added a check in comint-exec-1 to raise an error if
start-file-process returns nil. Additionally, if you start "shell"
with a prefix argument, and default-directory is a remote file name,
you will be prompted now to change the value of default-directory.

  "C-u M-x shell RET"

shall be reasonable now if you are on a remote FTP site.

Best regards, Michael.