GNU bug report logs - #25419
give better message when trying to go to forbidden areas

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: bug#25419: closed (Re: bug#25419: give better message when trying
 to go to forbidden areas)
Date: Fri, 27 Jan 2017 09:00:02 +0000

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Your bug report

#25419: give better message when trying to go to forbidden areas

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25419 <at> debbugs.gnu.org.

-- 
25419: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25419
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: npostavs <at> users.sourceforge.net
Cc: 25419-done <at> debbugs.gnu.org, jidanni <at> jidanni.org
Subject: Re: bug#25419: give better message when trying to go to forbidden
 areas
Date: Fri, 27 Jan 2017 10:59:08 +0200

> From: npostavs <at> users.sourceforge.net
> Cc: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>,
>   25419 <at> debbugs.gnu.org
> Date: Wed, 18 Jan 2017 22:28:17 -0500
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: 積丹尼 Dan Jacobson
> >> 	<jidanni <at> jidanni.org>
> >> Date: Wed, 11 Jan 2017 22:44:08 +0800
> >> 
> >> Do C-x C-f ~root
> >> You will see:
> >> Setting current directory: Success, /root/
> >
> > That's because /root has a file-name handler,
> > tramp-completion-file-name-handler, and although that handler turns
> > around and calls file-accessible-directory-p, the value of errno is
> > lost in transition:
> >
> >   /* If the file name has special constructs in it,
> >      call the corresponding file handler.  */
> >   handler = Ffind_file_name_handler (absname, Qfile_accessible_directory_p);
> >   if (!NILP (handler))
> >     {
> >       Lisp_Object r = call2 (handler, Qfile_accessible_directory_p, absname);
> >       errno = 0;
> >       return r;
> >     }
> >
> > Is there any better way than arbitrarily set errno to EACCES if the
> > handler returns something other than t?
> 
> AFAICT, not without changing the interface of
> file-accessible-directory-p file handler, no.

OK, thanks.  I made that change, and I'm marking this bug done.

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From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <bug-gnu-emacs <at> gnu.org>
Subject: give better message when trying to go to forbidden areas
Date: Wed, 11 Jan 2017 22:44:08 +0800

Do C-x C-f ~root
You will see:
Setting current directory: Success, /root/

But that is about all.

Because normally,

$ cd ~root
bash: cd: /root: Permission denied

Which better reflects reality.

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