bug#1741: 23.0.60; vc fail to register file while logged as /su:: with tramp

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hi, 
i can't register a file with vc/rcs when i am logged as root throught
tramp.
1) C-x v i
2) Create RCS dir (y/n) ==> The dir is created.
3) But now ==> _Here the debug output_:

,----
| Debugger entered--Lisp error: (wrong-type-argument stringp nil)
|   file-exists-p(nil)
|   vc-insert-file(nil "^[0-9]")
|   vc-rcs-fetch-master-state("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-rcs-working-revision("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   apply(vc-rcs-working-revision "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-call-backend(RCS working-revision "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-working-revision("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-default-mode-line-string(RCS "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   apply(vc-default-mode-line-string RCS "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-call-backend(RCS mode-line-string "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-mode-line("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   run-hook-with-args(vc-mode-line "/su:root@tux.homenetwork:/usr/local/bin/editeur.sh")
|   vc-resynch-window("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh" t t)
|   vc-resynch-buffer("/su:root@tux.homenetwork:/usr/local/bin/editeur.sh" t t)
| 
| [...]
| 
| [G70600 G70601 rev comment file --cl-dolist-temp-- 
| message "Registering %s... " mapc vc-file-clearprops vc-call-backend
|   register nil vc-file-setprop 
| vc-backend "Registering %s... done"] 6] (quote --files--) (quote --backend--) --cl-rest--)))
|   vc-register(nil)
|   call-interactively(vc-register nil nil)
`----

_And if i want to delete RCS directory from dired_:

,----
| (file-error Couldn't delete /su:root@tux.homenetwork:/usr/local/bin/RCS)
`----

However if i open an emacs  root session i can register my file as
normal.

(It's a long time i have this problem and always forget to send bug -
since emacs 22 i think)

Thank you.

Thierry.

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'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, GTK+ Version 2.14.5)
 of 2008-12-27 on tux
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--prefix=/usr' '--host=i686-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-23' '--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--with-freetype' '--with-xft' '--without-libotf' '--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' '--build=i686-pc-linux-gnu' 'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-march=i686 -pipe -O2' 'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: fr_FR.UTF-8
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: fr_FR.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:
  icomplete-mode: t
  icicle-mode: t
  delete-selection-mode: t
  minibuffer-depth-indicate-mode: t
  auto-image-file-mode: t
  partial-completion-mode: t
  display-wireless-mode: t
  display-battery-mode: t
  display-time-mode: t
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  savehist-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <return> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> $ @ C-x C-s <f11> a 
<down> <return> C-x b <return> C-x v i <down> <up> 
C-x k <return> C-x k <return> <down> <down> <up> <up> 
C-x # C-x # <down> <down> <down> <down> f i n i s h 
C-x C-s C-x # <f7> m <return> <return> q q y <f11> 
a <down> <down> <down> <down> <down> <return> <return> 
C-x v i y <up> C-SPC C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-x r s a C-g <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> q 
C-x C-f <return> g <up> <up> <up> <up> <up> <up> D 
y C-h e <up> <up> C-SPC C-e C-x r s z C-g <f11> a <return> 
M-! r m SPC - r f SPC R C S <return> g <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> M + w <return> g <f11> a <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <return> M-x r e p o r t - e m a <tab> <down> 
<return>

Recent messages:
(file-error Couldn't delete /su:root@tux.homenetwork:/usr/local/bin/RCS)

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-- 
A + Thierry Volpiatto
Location: Saint-Cyr-Sur-Mer - France