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bug#9781: 24.0.90; VC can't commit removed files/directories.

From: Jan Djärv
Subject: bug#9781: 24.0.90; VC can't commit removed files/directories.
Date: Tue, 18 Oct 2011 08:36:58 +0200

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

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':

I'm surprised nobody has seen this.

In a bzr repository, do
% bzr rm some-file

and modify some other file.

Then in Emacs, do vc-dir on the directory where the file was.
Mark the file that is listed as removed.  Also mark the edited file.
Press v.

Expected result: I can type in a log message and commit.
Real result: A prompt in the minibuffer appears:
some-file is edited but read-only; make it writable and continue? (y/n) 

This is because in vc.el, vc-next-action there is this:

      (let ((ready-for-commit files))
        ;; If files are edited but read-only, give user a chance to correct
        (dolist (file files)
          (unless (file-writable-p file)
            ;; Make the file+buffer read-write.
            (unless (y-or-n-p (format "%s is edited but read-only; make it 
writable and continue? " file))
              (error "Aborted"))
            ;; Maybe we somehow lost permissions on the directory.
            (condition-case nil
                (set-file-modes file (logior (file-modes file) 128))
              (error (error "Unable to make file writable")))

Files/directories that are removed are obviously not file-writable-p, so the 
logic is wrong.
Also, the choices in the question should be three:

1 Make writable and continue.
2 Don't make writable and continue
3 Abort

As it is now, you either exit on the "Aborted" error or if you try to continue 
on the "Unable to make file writable" error.

        Jan D.

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 (x86_64-apple-darwin11.2.0, NS apple-appkit-1138.23)
of 2011-10-18 on zeplin
Windowing system distributor `Apple', version 10.3.1138
configured using `configure  '--verbose' '--enable-asserts' '--with-ns' 
'--without-x-toolkit' 'CFLAGS=-g''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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: sv_SE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  desktop-save-mode: t
  delete-selection-mode: t
  icomplete-mode: t
  display-time-mode: t
  tooltip-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - e m <tab> <return>

Recent messages:
Loading /Users/jhd/lib/elisp/BAK-file.el (source)...done
Loading /Users/jhd/lib/elisp/ccsetup.el (source)...done
Loading icomplete...done
Loading desktop...done
No desktop file.
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

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mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
emacsbug desktop cus-start cus-load msb delsel advice help-fns
advice-preload icomplete cc-mode cc-fonts easymenu cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs regexp-opt time
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win
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make-network-process ns multi-tty emacs)

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