GNU bug report logs - #27871
26.0.50; Bad handling of unmounted directory

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Philipp <p.stephani2 <at> gmail.com>
Subject: bug#27871: closed (Re: bug#27871: [PATCH] Treat unreachable
 current directory as error)
Date: Thu, 05 Oct 2017 23:07:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#27871: 26.0.50; Bad handling of unmounted directory

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 27871 <at> debbugs.gnu.org.

-- 
27871: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=27871
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: phst <at> google.com, p.stephani2 <at> gmail.com, 27871-done <at> debbugs.gnu.org
Subject: Re: bug#27871: [PATCH] Treat unreachable current directory as error
Date: Thu, 5 Oct 2017 16:06:17 -0700

On 10/05/2017 03:13 AM, Eli Zaretskii wrote:
> Thanks, this LGTM.  I think we want this on the release branch.

OK, thanks, installed, and closing this bug report.

[Message part 3 (message/rfc822, inline)]

From: Philipp <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; Bad handling of unmounted directory
Date: Sat, 29 Jul 2017 23:06:32 +0200

Create a FUSE mount point, e.g.

cd /tmp
mkdir a a/a b
touch a/a/a
bindfs -f a b

While bindfs(1) is running, cd to the mounted directory in a second
shell:

cd /tmp/b/a

Now kill bindfs, e.g. by hitting ^C in the first shell.  The second
shell will now be in an unmounted directory.  From that directory, start
Emacs:

$ emacs -Q -batch a
Apparent cycle of symbolic links for (unreachable)

or, with stack trace

$ emacs -Q -batch -f toggle-debug-on-error a
Debug on Error enabled globally
...
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a/(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a/(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a/(unreachable)/a/(unreachable)" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a/(unreachable)/a/(unreachable)/a" (-1) (nil))
  file-truename("(unreachable)/a/(unreachable)/a/(unreachable)/a/(unreachable)/a/a")
  find-file-noselect("(unreachable)/a/(unreachable)/a/a")
  #f(compiled-function (displayable-buffers dir line column name) #<bytecode>)((nil) "(unreachable)/a/" (0) (0) "a")
  command-line-1(("-f" "toggle-debug-on-error" "a"))
  command-line()
  normal-top-level()

It seems like the logic for `default-directory' and/or `file-truename'
should be improved for unmounted filesystems.


In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2017-07-29 built on unknown
Repository revision: 2c930d15f541761422a268cd2b5a7f5c11c9a00e
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description:	Ubuntu 14.04.5 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules --without-pop --with-mailutils
 --enable-checking --enable-check-lisp-object-type --enable-gcc-warnings
 'CFLAGS=-ggdb3 -O0''

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 94115 11926)
 (symbols 48 20077 1)
 (miscs 40 38 119)
 (strings 32 28435 1945)
 (string-bytes 1 754739)
 (vectors 16 13893)
 (vector-slots 8 487465 12899)
 (floats 8 48 97)
 (intervals 56 205 0)
 (buffers 992 11)
 (heap 1024 19129 984))

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