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bug#9123: bug/misbehaviour in vc-next action when stealing locks
From: |
Glenn Morris |
Subject: |
bug#9123: bug/misbehaviour in vc-next action when stealing locks |
Date: |
Mon, 5 Sep 2011 20:55:11 -0400 |
Kourosh Neshatian wrote (on Sun, 4 Sep 2011 at 15:57 +1200):
> I wonder if you could reproduce the error.
No, see below.
> > Steps to reproduce the error:
> >
> > 1. Alice (user name 'alice') runs Emacs with 'emacs -q --no-site-file'
> >
> > 2. Alice creates a text file in the directory, say 'document.tex', writes
> > some text in it and saves it.
> >
> > 3. She runs 'vc-next-action' (C-x v v) and chooses RCS as her
> > backend. This creates an RCS file 'RCS/document.tex,v'.
> >
> > 4. Alice checks out and locks the file again by 'vc-next-action' (C-x
> > v v) to add/make some changes in the document.
I did the following as normal user A:
umask 0
mkdir ~/foo
echo "test" > foo/1
emacs-23.3 -Q foo/1
C-x v v RCS RET RET # now registered with RCS
C-x v v # now file is checked out
> > 5. Meanwhile, Bob (user name 'bob') logs in. ?He has access to the RCS
> > directory (usually via a symbolic link). He checks out document.tex
> > stealing ?the lock (rcs -l ...).
I logged in as normal user B and did:
emacs-23.3 -Q ~A/foo/1
Emacs says "Note: file is write protected".
C-x v v
steal the lock yes/no? yes RET
A mail buffer pops up, prompting me to send an email to user A explaining
why I stole the lock. I do so.
> > 6. Now, Alice has finished editing her copy; she saves the file and
> > runs 'vc-next-action' (to check in). Emacs will ask her if she wants
> > to steal the lock, she says 'yes'. What happens is that Emacs
> > over-writes her local copy by the last version in the
> > repository. Alice's changes/edits are all gone and apparently she does
> > not have any means to recover!
Back in user A's still-running Emacs, I type some text in the still
open buffer. Emacs says:
file changed on disk; really edit the buffer?
I answer yes, type some text and save. Emacs says:
file has changed since visited or saved. Save anyway?
I answer yes. Emacs says:
file is write-protected; try to save anyway?
I answer yes.
I then do C-x v v and try to check in the file. This fails, with an
error message that the file is locked by user B.
This was with RCS 5.7. I never notmally use RCS, maybe I am missing
something.
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