bug#8603: 23.3.50; vc-dir can easily guess wrong VCS

bug#8603: 23.3.50; vc-dir can easily guess wrong VCS

[Reuben Thomas]

If I run vc-dir on a directory /foo/bar/baz, where /foo/.bzr and
/foo/bar/.git exist, then Emacs guesses wrongly that /foo/bar/baz is
under Bzr.

It seems that first, the directory is not registered with a backend
(which may be on purpose, since git does not actually register
directories?), but then secondly that /foo is checked before /foo/bar
when deciding which backend to use.

Further, deleting the .bzr directory (which was indeed bogus; it’s
obviously relatively rare to have a tree under one VCS inside a tree
under another, with the exception of foreign modules, possibly?) did not
help: I had to restart Emacs to get it to forget the .bzr directory.


In GNU Emacs 23.3.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.4)
 of 2011-04-24 on canta
Windowing system distributor `The X.Org Foundation', version 11.0.11001000
Important settings:
  value of $LC_ALL: nil
  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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  recentf-mode: t
  show-paren-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  iswitchb-mode: t
  icomplete-mode: t
  global-whitespace-mode: t
  global-auto-revert-mode: t
  desktop-save-mode: t
  nxhtml-menu-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-: M-" <up> <return> M-: <up> <left> <left> C-e <left> 
<left> / d o c <return> M-: <up> <return> C-x b C-g 
C-x c f C-x v f C-x v c d C-x v d <up> <return> C-x 
k <return> <help-echo> <help-echo> <down-mouse-1> <mouse-1> 
<help-echo> M-x r e p o r t b u - <backspace> <backspace> 
<backspace> - e m a c v s - <backspace> <backspace> 
<backspace> s - b u <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
nil [3 times]
Quit
Buffer is read-only: #<buffer vc.el.gz>
vc-deduce-fileset: No fileset is available here
Buffer is read-only: #<buffer vc.el.gz>
Loading add-log...done
Loading make-mode...done
Loading autoconf...done
found match ]] [19 times]

Load-path shadows:
/home/rrt/local/share/emacs/nxhtml/util/rnc-mode hides /usr/share/emacs-snapshot/site-lisp/rnc-mode/rnc-mode
/home/rrt/local/share/emacs/nxhtml/related/php-mode hides /home/rrt/local/share/emacs/site-lisp/php-mode
/home/rrt/.emacs.d/elpa/dictionary-1.8.7/link hides /usr/local/share/emacs/23.3.50/site-lisp/dictionary-el/link
/home/rrt/.emacs.d/elpa/dictionary-1.8.7/connection hides /usr/local/share/emacs/23.3.50/site-lisp/dictionary-el/connection
/home/rrt/.emacs.d/elpa/dictionary-1.8.7/dictionary-init hides /usr/local/share/emacs/23.3.50/site-lisp/dictionary-el/dictionary-init
/home/rrt/.emacs.d/elpa/dictionary-1.8.7/dictionary hides /usr/local/share/emacs/23.3.50/site-lisp/dictionary-el/dictionary
/home/rrt/local/share/emacs/site-lisp/graphviz-dot-mode hides /usr/local/share/emacs/23.3.50/site-lisp/emacs-goodies-el/graphviz-dot-mode
/home/rrt/local/share/emacs/site-lisp/dict hides /usr/local/share/emacs/23.3.50/site-lisp/emacs-goodies-el/dict
/usr/local/share/emacs/23.3.50/site-lisp/css-mode/css-mode hides /usr/local/share/emacs/23.3.50/lisp/textmodes/css-mode
/usr/share/emacs-snapshot/site-lisp/ruby1.8-elisp/ruby-mode hides /usr/local/share/emacs/23.3.50/lisp/progmodes/ruby-mode
/usr/local/share/emacs/23.3.50/site-lisp/css-mode/css-mode hides /usr/share/emacs/site-lisp/css-mode/css-mode
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-info hides /usr/share/emacs/site-lisp/auctex/tex-info
/usr/local/share/emacs/23.3.50/site-lisp/auctex/context-nl hides /usr/share/emacs/site-lisp/auctex/context-nl
/usr/local/share/emacs/23.3.50/site-lisp/auctex/context-en hides /usr/share/emacs/site-lisp/auctex/context-en
/usr/local/share/emacs/23.3.50/site-lisp/auctex/latex hides /usr/share/emacs/site-lisp/auctex/latex
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-mik hides /usr/share/emacs/site-lisp/auctex/tex-mik
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-buf hides /usr/share/emacs/site-lisp/auctex/tex-buf
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-jp hides /usr/share/emacs/site-lisp/auctex/tex-jp
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-bar hides /usr/share/emacs/site-lisp/auctex/tex-bar
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex hides /usr/share/emacs/site-lisp/auctex/tex
/usr/local/share/emacs/23.3.50/site-lisp/auctex/multi-prompt hides /usr/share/emacs/site-lisp/auctex/multi-prompt
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-fptex hides /usr/share/emacs/site-lisp/auctex/tex-fptex
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-font hides /usr/share/emacs/site-lisp/auctex/tex-font
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-fold hides /usr/share/emacs/site-lisp/auctex/tex-fold
/usr/local/share/emacs/23.3.50/site-lisp/auctex/texmathp hides /usr/share/emacs/site-lisp/auctex/texmathp
/usr/local/share/emacs/23.3.50/site-lisp/auctex/context hides /usr/share/emacs/site-lisp/auctex/context
/usr/local/share/emacs/23.3.50/site-lisp/auctex/font-latex hides /usr/share/emacs/site-lisp/auctex/font-latex
/usr/local/share/emacs/23.3.50/site-lisp/auctex/bib-cite hides /usr/share/emacs/site-lisp/auctex/bib-cite
/usr/local/share/emacs/23.3.50/site-lisp/auctex/toolbar-x hides /usr/share/emacs/site-lisp/auctex/toolbar-x
/usr/local/share/emacs/23.3.50/site-lisp/auctex/tex-style hides /usr/share/emacs/site-lisp/auctex/tex-style

Features:
(shadow sort mail-extr message sendmail ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
time-date mm-util mail-prsvr gmm-utils mailheader canlock hashcash
mail-utils emacsbug autoconf autoconf-mode make-mode add-log vc-sccs
vc-svn vc-cvs vc-rcs vc-dir ewoc vc vc-dispatcher vc-bzr sha1 hex-util
sh-script executable vc-git tex-info texinfo tex face-remap filladapt
flyspell jka-compr completing-help recentf tree-widget wid-edit uniquify
paren savehist minibuf-eldef iswitchb icomplete whitespace autorevert
time as-external wrap-to-fill cus-start cus-load desktop server
nxhtml-autostart nxhtml-autoload majmodpri rnc-mode nxhtml-menu
web-autoload nxhtml-base php-mode etags cc-langs cc-mode cc-fonts
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs speedbar
sb-image ezimage dframe lua-mode regexp-opt comint ring ropemacs pymacs
ffap ispell smart-quotes auto-dictionary-autoloads c-eldoc-autoloads
dictionary-autoloads diff-git-autoloads dired-isearch-autoloads
full-ack-autoloads guess-style-autoloads kill-ring-search-autoloads
magit-autoloads mv-shell-autoloads tumble-autoloads
http-post-simple-autoloads package reporter advice advice-preload
yasnippet help-fns derived edmacro kmacro easymenu assoc cl cl-19
muse-autoloads emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode preview-latex tex-site auto-loads
tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
font-setting tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew
greek romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind system-font-setting
font-render-setting gtk x-toolkit x multi-tty emacs)

-- 
http://rrt.sc3d.org/

bug#8603: 23.3.50; vc-dir can easily guess wrong VCS

[Glenn Morris]

Reuben Thomas wrote:

> If I run vc-dir on a directory /foo/bar/baz, where /foo/.bzr and
> /foo/bar/.git exist, then Emacs guesses wrongly that /foo/bar/baz is
> under Bzr.

This is the documented way it works, for the time being at least.
This is basically a duplicate of

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8179


> Further, deleting the .bzr directory (which was indeed bogus; it's
> obviously relatively rare to have a tree under one VCS inside a tree
> under another, with the exception of foreign modules, possibly?) did not
> help: I had to restart Emacs to get it to forget the .bzr directory.

bug#8603: 23.3.50; vc-dir can easily guess wrong VCS

[Reuben Thomas]

On 2 May 2011 21:17, Glenn Morris <rgm@gnu.org> wrote:
>
> This is the documented way it works, for the time being at least.
> This is basically a duplicate of
>
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8179

Thanks for the pointer. To describe the current behavior as
"documented" is stretching things, though (at least, I had to trawl
through the code to get a handle on what was going on, and I can see
no documentation cited in the thread above or in the docstrings that
describes the current behavior).

In any case, documented or not, it's a bug, and it's a bug in the
stable version of Emacs, not just the development version.

-- 
http://rrt.sc3d.org