GNU bug report logs - #5414
23.1.91; /sys/devices files trigger loading tramp

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Package: emacs;

Reported by: jidanni <at> jidanni.org

Date: Mon, 18 Jan 2010 20:41:03 UTC

Severity: normal

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

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Message #26 received at 5414 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 5414 <at> debbugs.gnu.org, Miles Bader <miles <at> gnu.org>, jidanni <at> jidanni.org
Subject: Re: bug#5414: 23.1.91; /sys/devices files trigger loading tramp
Date: Wed, 20 Jan 2010 20:05:31 +0100

Chong Yidong <cyd <at> stupidchicken.com> writes:

> Here's a proper recipe for reproducing this (the previous recipe does
> not do it, maybe it was untested):
>
>  emacs -Q
>  C-x C-f
>  C-a C-k
>  /sys/devices/pc [TAB]
>     => Tramp will be loaded

Thanks, I can reproduce it as well.

Tramp is loaded due to `rfn-eshadow-update-overlay'. In the loop
commented with "Binary search ...", it recomputes `mid', and calls
`rfn-eshadow-sifn-equal'. This function applies
`substitute-in-file-name' for a part of the the whole file name, which
looks like a remote file name, accidently. Bingo!

See the backtrace:

  tramp-file-name-handler(substitute-in-file-name "/pci0000:00/")
  substitute-in-file-name("/pci0000:00/")
  byte-code("ÁÂd\"!‡" [pos substitute-in-file-name buffer-substring-no-properties] 4)
  byte-code("ÆÇ !È!É dƒ;	=„'T‰ÊË̏š*„;
=„‡‰ÊË̏š*„‡
T	W„a	TdWƒ€	T‰ÊË̏š*ƒ€	Td‰ƒ€
	\\Í¥‰ÊË̏š*ƒ{‰‚<‚;ÎÉ 
#ˆÏÐ!,‡" [rfn-eshadow-overlay end start mid goal pos substitute-in-file-name minibuffer-contents overlay-end minibuffer-prompt-end nil (byte-code "ÁÂd\"!‡" [pos substitute-in-file-name buffer-substring-no-properties] 4) ((error)) 2 move-overlay run-hooks rfn-eshadow-update-overlay-hook] 5)
  rfn-eshadow-update-overlay()
  run-hooks(post-command-hook)

I wouldn't regard it as a bug. One could argue, that rfn-shadow should
deactivate file name handlers for its work, but this might result in
collateral damages.

Best regards, Michael.
This bug report was last modified 15 years and 130 days ago.

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