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RE: vc-revert-hook?

From: Marshall, Simon
Subject: RE: vc-revert-hook?
Date: Thu, 8 May 2008 09:09:42 +0100

>   > Some time ago, vc.el used to have a vc-revert-hook.  I used it to
cause a
> Can you point out the version, or the exact name of the hook, a search
> vc-revert-hook comes out empty...

Hi Dan, sorry, my bad.  Looking through some archives, it seems I had a
conversation with Andre Spiegel in 2003, when I suggested adding it.  I
had a hacked version of vc.el to try it out, but it seems we didn't
follow it to its conclusion and it didn't get put in emacs itself.

>   > subsequent recompilation - of a modified source file that I had
then reverted
>   > via C-x v u (AKA M-x vc-revert-buffer) - by touching the source
>   > 
>   >   (add-hook 'vc-revert-hook
>   >             (lambda ()
>   >               (shell-command (concat "touch " buffer-file-name))))
>   > 
>   > Without this, CVS (my backend VCS) or vc.el would leave the
reverted source
>   > file with the timestamp of the reverted revision, ie, older than
the modified
>   > file, and a dependency-based recompilation would be fooled into
thinking that
>   > the source file's compiled object file was up-to-date.
> Are you sure?  A quick experiment showed that and after C-x v u the
> on disk had the time stamp set to the current time...
> Can you replicate the problem with emacs -Q?

Sure, with CVS:

risksun2 104> ls -l Makefile 
-r--r--r--   1 marshals gcms         707 May  2 11:33 Makefile
risksun2 105> pemacs -Q Makefile&
[1] 12298

Where pemacs is my 22.2 + patches to cc-mode from Alan.
In emacs, do C-x v v on Makefile, edit, save and:

risksun2 106> ls -l Makefile
-rw-r--r--   1 marshals gcms         708 May  8 08:50 Makefile

No surprise there.
In emacs, do C-x v u on Makefile, confirm and:

risksun2 107> ls -l Makefile
-r--r--r--   1 marshals gcms         707 May  2 11:33 Makefile

As you can see, the original timestamp is restored on reversion.

risksun2 108> env|grep CVS
risksun2 109> cvs -v

Concurrent Versions System (CVS) 1.12.9 (client/server)

Copyright (c) 1989-2004 Brian Berliner, david d `zoo' zuhn,
                        Jeff Polk, and other authors

CVS may be copied only under the terms of the GNU General Public
a copy of which can be found with the CVS distribution kit.

Specify the --help option for further information about CVS
risksun2 110> 

I verified that unsetting CVSREAD made no difference.

Does this help?  Thanks, Simon.

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