Gnus and Tramp

Gnus and Tramp

[Oliver Heins]

I realized that tramp and Gnus don't work really well together.  I often
run in problems when using both at the same time.  Mostly, I can't
connect to the remote file anymore if I'm running Gnus and cease to work
on the file for some time.

Conversely, if I'm visiting a tramp buffer and then try to start Gnus, it
won't start but hang with an error.  I then get this error message:

,----
| Loading gnus-start...
| tramp-handle-executable-find: Wrong type argument: arrayp, tramp-default-remote-path
`----

Here's the backtrace:

,----
| Debugger entered--Lisp error: (wrong-type-argument arrayp tramp-default-remote-path)
|   tramp-find-executable([cl-struct-tramp-file-name "scp" nil "cryptix.de" nil] "w3m" (tramp-default-remote-path "/usr/sbin" "/usr/local/bin" "/local/bin" "/local/freeware/bin" "/local/gnu/bin" "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin") t)
|   tramp-handle-executable-find("w3m")
|   apply(tramp-handle-executable-find "w3m")
|   (setq ad-return-value (apply (quote tramp-handle-executable-find) (list command)))
|   (if (eq (tramp-find-foreign-file-name-handler default-directory) (quote tramp-sh-file-name-handler)) (setq ad-return-value (apply ... ...)) (setq ad-return-value (ad-Orig-executable-find command)))
|   (let (ad-return-value) (if (eq ... ...) (setq ad-return-value ...) (setq ad-return-value ...)) ad-return-value)
|   executable-find("w3m")
|   (cond ((locate-library "w3") (quote w3)) ((executable-find "w3m") (if ... ... ...)) ((executable-find "links") (quote links)) ((executable-find "lynx") (quote lynx)) (t (quote html2text)))
|   eval((cond ((locate-library "w3") (quote w3)) ((executable-find "w3m") (if ... ... ...)) ((executable-find "links") (quote links)) ((executable-find "lynx") (quote lynx)) (t (quote html2text))))
|   custom-initialize-reset(mm-text-html-renderer (cond ((locate-library "w3") (quote w3)) ((executable-find "w3m") (if ... ... ...)) ((executable-find "links") (quote links)) ((executable-find "lynx") (quote lynx)) (t (quote html2text))))
|   custom-declare-variable(mm-text-html-renderer (cond ((locate-library "w3") (quote w3)) ((executable-find "w3m") (if ... ... ...)) ((executable-find "links") (quote links)) ((executable-find "lynx") (quote lynx)) (t (quote html2text))) ("/usr/share/emacs/22.0.50/lisp/gnus/mm-decode.elc" . 3631) :version "22.1" :type (choice (const w3) (const w3m) (const w3m-standalone) (const links) (const lynx) (const html2text) (const nil) (function)) :group mime-display)
|   require(mm-decode)
|   byte-code("ÀÁ!ˆÀÂ!ˆÀÃ!ˆÀÄ!ˆÀÅ!ˆÆÇÈ\"ˆÆÉÊ\"ˆÆËÌ\"ˆÆÍÎ\"ˆÆÏÐ\"ˆÆÑÒ\"ˆÆÓÔ\"ˆÆÕÖ\"ˆÆ×Ø\"‡" [require mm-util mm-bodies mm-encode mm-decode mml-sec autoload message-make-message-id "message" gnus-setup-posting-charset "gnus-msg" gnus-add-minor-mode "gnus-ems" gnus-make-local-hook "gnus-util" message-fetch-field "message" message-info "message" fill-flowed-encode "flow-fill" message-posting-charset "message" dnd-get-local-file-name "dnd"] 3)
|   require(mml)
|   byte-code("ÀÁ!ˆÀÂ!ˆÀÃ!ˆÀÄ!ˆÀÅ!ˆÀÆ!ˆÀÇ!ˆÀÈ!ˆÉÊË\"ˆÉÌÍ\"ˆÉÎÏ\"ˆÐÑÒÓÔÕÖ×ÖØ&	ˆÙÚÛÜ#ˆÙÝÛÜ#ˆÐÞßàÔáÖÑ&\aˆÐâßãÔäÖÑ&\aˆÐåßæÔçÖÑ&\aˆÐèßéÔêÖÑ&\aˆÐëßìÔíÖè&\aˆÐîßïÔðÖÑ&\aˆÐñßòÔóÖÑ&\aˆÐôßõÖÑ%ˆÐöß÷ÖÑ%ˆÐøßùÖÑÖú&\a‡" [require canlock mailheader gmm-utils nnheader mailabbrev mail-parse mml rfc822 autoload gnus-find-method-for-group "gnus" nnvirtual-find-group-art "nnvirtual" gnus-group-decoded-name "gnus-group" custom-declare-group message ((user-mail-address custom-variable) (user-full-name custom-variable)) "Mail and news message composing." :link (custom-manual "(message)Top") :group mail news put user-mail-address custom-type string user-full-name message-various nil "Various Message Variables." (custom-manual "(message)Various Message Variables") message-buffers "Message Buffers." (custom-manual "(message)Message Buffers") message-sending "Message Sending." (custom-manual "(message)Sending Variables") message-interface "Message Interface." (custom-manual "(message)Interface") message-forwarding "Message Forwarding." (custom-manual "(message)Forwarding") message-insertion "Message Insertion." (custom-manual "(message)Insertion") message-headers ...] 10)
|   require(message)
|   byte-code("ÀÁ!ˆÀÂ!ˆÀÃ!ˆÄÅÆ\"ˆÄÇÈ\"ˆÄÉÊ\"‡" [require gnus message gnus-range autoload gnus-agent-expire "gnus-agent" gnus-agent-regenerate-group "gnus-agent" gnus-agent-read-servers-validate-native "gnus-agent"] 3)
|   require(gnus-int)
|   byte-code("ÀÁ!ˆÀÂ!ˆÀÃ!ˆÀÄ!ˆÀÅ!ˆÀÆ!ˆÇÈÉ\"ˆÇÊË\"ˆÇÌÍ\"ˆÇÎÏ\"‡" [require gnus gnus-win gnus-int gnus-spec gnus-range gnus-util autoload message-make-date "message" gnus-agent-read-servers-validate "gnus-agent" gnus-agent-save-local "gnus-agent" gnus-agent-possibly-alter-active "gnus-agent"] 3)
|   gnus-1(nil nil nil)
|   gnus(nil)
|   call-interactively(gnus)
|   execute-extended-command(nil)
|   call-interactively(execute-extended-command)
`----

olli
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Re: Gnus and Tramp

[Katsumi Yamaoka]

>>>>> In <87wt6wdlzu.fsf@sopos.org> Oliver Heins wrote:

> I realized that tramp and Gnus don't work really well together.  I often
> run in problems when using both at the same time.  Mostly, I can't
> connect to the remote file anymore if I'm running Gnus and cease to work
> on the file for some time.

> Conversely, if I'm visiting a tramp buffer and then try to start Gnus, it
> won't start but hang with an error.  I then get this error message:

> ,----
>| Loading gnus-start...
>| tramp-handle-executable-find: Wrong type argument: arrayp, tramp-default-remote-path
> `----

> Here's the backtrace:

[...]
>|   tramp-handle-executable-find("w3m")

I don't know where `tramp-handle-executable-find' comes from.

[...]
>|   (if (eq (tramp-find-foreign-file-name-handler default-directory) (quote tramp-sh-file-name-handler)) (setq ad-return-value (apply ... ...)) (setq ad-return-value (ad-Orig-executable-find command)))

The function `executable-find' is advised in some way, however I
couldn't find out what does it in Emacs 22 and emacs-w3m.  It
might be in your ~/.emacs file or in the other version of Tramp
which is not that of Emacs 22.  What do you get with the command
`C-h f executable-find RET'?

Re: Gnus and Tramp

[Oliver Heins]

Katsumi Yamaoka <yamaoka@jpl.org> writes:

>>>>>> In <87wt6wdlzu.fsf@sopos.org> Oliver Heins wrote:
>
>> Here's the backtrace:
>
> [...]
>>|   tramp-handle-executable-find("w3m")
>
> I don't know where `tramp-handle-executable-find' comes from.
>
> [...]
>>|   (if (eq (tramp-find-foreign-file-name-handler default-directory) (quote tramp-sh-file-name-handler)) (setq ad-return-value (apply ... ...)) (setq ad-return-value (ad-Orig-executable-find command)))
>
> The function `executable-find' is advised in some way, however I
> couldn't find out what does it in Emacs 22 and emacs-w3m.  It
> might be in your ~/.emacs file or in the other version of Tramp
> which is not that of Emacs 22.  What do you get with the command
> `C-h f executable-find RET'?

,----[ C-h f executable-find RET ]
| executable-find is a compiled Lisp function in `files.el'.
| (executable-find COMMAND)
| 
| Search for COMMAND in `exec-path' and return the absolute file name.
| Return nil if COMMAND is not found anywhere in `exec-path'.
| 
| [back]
`----

olli@athene:~$ locate files.el
/usr/share/emacs/22.0.50/lisp/files.elc
/usr/share/emacs/22.0.50/lisp/files.el.gz
/var/lib/auctex/emacscvs/verbatimfiles.elc

So it obviously comes with Emacs 22.  However:

,----[ C-h v tramp-version RET ]
| tramp-version is a variable defined in `trampver.el'.
| Its value is "2.1.6"
| 
| Documentation:
| This version of Tramp.
| 
| [back]
`----

olli@athene:~$ apt-cache policy tramp
tramp:
  Installiert:1:2.1.6-1
  Mögliche Pakete:1:2.1.6-1
  Versions-Tabelle:
     1:2.1.7-1 0
          1 ftp://ftp.de.debian.org experimental/main Packages
 *** 1:2.1.6-1 0
        100 /var/lib/dpkg/status
     1:2.0.54-2 0
        500 ftp://ftp.de.debian.org unstable/main Packages

The version coming with Emacs 22 seems to be 2.0.54, which is the same
version as in Debian unstable.  I can't remember installing an
experimental version of tramp, so this looks a little bit weird to me.
I'd better go and remove that version and stick with that coming with
emacs.

However, perhaps the tramp developers are interested in a backtrace.  I
will upgrade to 2.1.7 and try again, and eventually write a bug report.

Thanks,
 olli


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