Re: UKKQueue and CVS
Re: UKKQueue and CVS
- Subject: Re: UKKQueue and CVS
- From: "Gary L. Wade" <email@hidden>
- Date: Fri, 24 Dec 2010 08:43:53 -0800
Source control systems may modify hidden files locally when performing a commit; some have historically utilized the resource fork of the particular file instead to keep that commit/modified state. Still others may choose to use an xattr to track this.
The bottom line is that the only real guarantee of a file being changed during a commit is within the repository of a source control system, not your local sandbox.
- Gary L. Wade (Sent from my iPhone)
On Dec 24, 2010, at 6:45 AM, Martin Hewitson <email@hidden> wrote:
> Hi Uli,
>
> I did try various combinations of the flags, and I even tried listening for all events:
>
> UKKQueueNotifyAboutRename | UKKQueueNotifyAboutWrite | UKKQueueNotifyAboutDelete | UKKQueueNotifyAboutAttributeChange
>
> I din't receive events having done a cvs commit on a file. However, I do get notified if I edit the file externally using vi or some other editor. I googled quite a bit but I can't find out what CVS actually does during a commit. I guess I'll try to dig some more. Perhaps I can get the source code for CVS and check there.
>
> Cheers,
>
> Martin
>
>
> On Dec 24, 2010, at 12:22 AM, Uli Kusterer wrote:
>
>> On 21.12.2010, at 11:58, Martin Hewitson wrote:
>>> I have implemented an editor where I use UKKQueue to handle changes to the file by other apps. The problem is that I don't get a notification if the file is committed to a CVS repository (or an SVN repository, for that matter).
>>
>> Many applications create a second file, write to that, then swap the two out afterwards. That way, if the write fails, you don't lose the file. Since kqueues work at a low level, you'll get a 'delete' or 'rename/move' notification in that case only. Have you checked if that's the case?
>>
>> Cheers,
>> -- Uli Kusterer
>> "The Witnesses of TeachText are everywhere..."
>> http://www.zathras.de
>>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Martin Hewitson
> Albert-Einstein-Institut
> Max-Planck-Institut fuer
> Gravitationsphysik und Universitaet Hannover
> Callinstr. 38, 30167 Hannover, Germany
> Tel: +49-511-762-17121, Fax: +49-511-762-5861
> E-Mail: email@hidden
> WWW: http://www.aei.mpg.de/~hewitson
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