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bug#11881: 23.3; m-! pwd shows true path but dired buffer shows symbol l

From: Aeron Wang
Subject: bug#11881: 23.3; m-! pwd shows true path but dired buffer shows symbol linked path
Date: Sun, 08 Jul 2012 18:24:31 -0400

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your report will be posted to the address@hidden mailing list
and the gnu.emacs.bug news group, and at http://debbugs.gnu.org.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

This is quite strange! and happened only occationally! I send this bug
report from the buffer happenly has the problem.

This is my journal of play with this problem... although nothing can
stop this problem, and I also not sure what caused it... but must be
Emacs, not shell.

> === notes begin ===

* TODO 20120708/7 in dired buf, do m-! pwd, or bash -c pwd, got absolute path, 
not the linked one.

when click S tabbar link to open Esession file:
edebug on file-truename:
  access-file("/tse_home/awang/myapp/GTAGS" "Reading directory")
  insert-directory("/tse_home/awang/myapp/GTAGS" "--dired -alh" t nil)
  dired-insert-directory("/tse_home/awang/myapp/GTAGS" "-alh" nil t t)

(dired "~/myapp/GTAGS") --> some times it fails --> true.. actually no such dir 
at all!
(dired "/tse_home/awang/myapp/") --> this works
(dired "/tse_home/awang/myapp/emacs.data/GTAGS") --> this ok
(dired "~/myapp/emacs.data/GTAGS")

set -o --> no pysical set
shopt --> nothing special
find-file-visit-truename --> nil
find-file-existing-other-name --> nil

looks like the real dir is absolute, since: m-! pwd -L also shows absolute one. 
echo $PWD also absolute one. but default-directory and dired-directory is 
relatiev one.
- also, c-cs *shell* is also shows at absolute path! in *shell*, cd to linked 
path, do c-xc-f to show dired buf, it's still m-! pwd showing absolute!
  ELISP> (file-truename "~/mycvs/delme") --> ie file-truename already gone.

(defun file-truename (f) (message "true called on '%s'" f) f)
the same behavior even it's called.

even this the same behavior:
ELISP> (unload-feature 'dired t)
ELISP> (unload-feature 'dired-aux t)
ELISP> (unload-feature 'dired-x t)
then -->
ELISP> (require 'dired)
ELISP> (require 'dired-x)
ELISP> (require 'dired-aux)
ELISP> (require 'files)
ELISP> (dired "~/myapp/")
#<buffer /tse_home/awang/myapp> --> still m-! pwd, giving absolute path!
did 'shell and 'comint; the same.

strange! strange!

no idea!!!

chk src on absolute:
ELISP> (expand-file-name "~/mycvs/delme")
ELISP> (file-name-absolute-p "~/mycvs/delme")
ok.. looks absolute is not that... search file_truename:
buffer-file-truename is nil

even did this, the same:
ELISP> (defadvice file-truename (around  any-my-name-advice (f) activate 
(let ()
        (message "true called on '%s'" f)

even in IELM buf, c-cd to it frm delme3 dired, do m-! pwd, still got: 

vc-follow-symlinks nil --> even set to 'ask, the same.
vc-hooks.el: (vc-follow-link)

you do not need to debug bash or pwd, since the dir is really at 
the issue is: why dired get there???

when *msg* current, m-! cd ~/mycvs;pwd ==> /tse_home/awang/mycvs
so looks it's an emacs issue.
when *dired* current, do above got true path.
ie looks dired goes to true path but it still shows symlink path.

del all bufs and do:
(dired "~/mycvs"), and m-! pwd, still got /mnt/wk1/..

frm that buf, did
report-emacs-bug and looks email sent out
> === end notes ===

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file

In GNU Emacs 23.3.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2011-11-18 on lnx
Windowing system distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure  'CFLAGS= -g3 -O0' 

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.utf-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.utf-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Dired by name

Minor modes in effect:
  shell-dirtrack-mode: t
  orgstruct-mode: t
  text-scale-mode: t

Recent input:
<down-mouse-1> <mouse-1> M-: ( C-y SPC - 1 ) <return> 
<help-echo> <help-echo> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> <down-mouse-1> <mouse-movement> <mouse-movement> 
<drag-mouse-1> M-: ( C-y SPC - 1 ) <return> <down-mouse-1> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<help-echo> <mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <help-echo> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <drag-mouse-1> C-c 
N C-y <help-echo> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <down-mouse-1> <mouse-movement> 
<mouse-movement> <mouse-movement> <drag-mouse-1> M-% 
: SPC t <return> <return> ! M-< ( p <backspace> <backspace> 
C-M-% ^ <return> ( <return> ! \ <backspace> <backspace> 
<down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> 
C-x r k <down-mouse-1> <mouse-movement> <mouse-movement> 
<drag-mouse-1> C-M-% $ <return> SPC - 1 ) <return> 
! <return> ) M-< <return> C-p ( p r o g n <down-mouse-1> 
<mouse-1> <down-mouse-1> <mouse-1> C-x C-e <help-echo> 
<help-echo> <help-echo> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-1> <mouse-1> <down-mouse-5> 
<mouse-5> <double-down-mouse-5> <double-mouse-5> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <down-mouse-1> <mouse-1> 
<down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> 
<down-mouse-1> <mouse-movement> <drag-mouse-1> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <down-mouse-1> <mouse-1> 
<down> <down> <down> <down> <down> <down> <help-echo> 
<down-mouse-2> <mouse-2> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> <down-mouse-1> <mouse-1> M-< M-< M-< C-n 
C-p C-n <down-mouse-1> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <mouse-movement> 
<mouse-movement> <mouse-movement> <drag-mouse-1> C-M-% 
. * C-b C-b <return> ( i n g <backspace> <backspace> 
g n o r e - e r r o r s SPC \ & ) <return> y ! <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <down-mouse-4> <mouse-4> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <down-mouse-1> 
<mouse-1> M-< M-< M-< <down-mouse-1> <mouse-1> C-x 
C-e <down-mouse-1> <mouse-1> <double-down-mouse-1> 
<double-mouse-1> <help-echo> <down-mouse-1> <mouse-1> 
M-: M-p M-p M-p M-r d i r e d <return> ( C-e M-b C-b 
C-k SPC " ~ / m y c v s " ) <return> M-: M-! p w d 
<return> <help-echo> <help-echo> <help-echo> <down-mouse-2> 
<mouse-2> <down-mouse-1> <mouse-1> M-x M-p <return

Recent messages:
force to be writable
Replaced 19 occurrences
Replaced 20 occurrences
true called on 
Replaced 19 occurrences
Entering debugger...
Replaced 19 occurrences
#<buffer mycvs>

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