Re: Re: Merge with git-pasky II.

From: Simon Fowler <simon@himi.org>
Date: Apr 16, 2005, 16:26 UTC
Message-ID: <20050416162614.GY4488@himi.org>
In-Reply-To: <20050416160333.GF19099@pasky.ji.cz>

On Sat, Apr 16, 2005 at 06:03:33PM +0200, Petr Baudis wrote:

Show 17 quoted lines

> Dear diary, on Sat, Apr 16, 2005 at 05:55:37PM CEST, I got a letter
> where Simon Fowler <simon@himi.org> told me that...
> > On Sat, Apr 16, 2005 at 05:19:24AM -0700, David Lang wrote:
> > > Simon
> > > 
> > > given that you have multiple machines creating files, how do you deal with 
> > > the idea of the same 'unique id' being assigned to different files by 
> > > different machines?
> > > 
> > The id is a sha1 hash of the current time and the full path of the
> > file being added - the chances of that being replicated without
> > malicious intent is extremely small. There are other things that
> > could be used, like the hostname, username of the person running the
> > program, etc, but I don't really see them being necessary.
> 
> Why not just use UUID?
>

Hey, everything else in git seems to use sha1, so I just copied Linus' sha1 code ;-)

All I wanted was something that had a good chance of being unique across any potential set of distributed repositories, to avoid the chance of accidental clashes. A sha1 hash of something that's not likely to be replicated is a simple way to do that.

Simon

-- 
PGP public key Id 0x144A991C, or http://himi.org/stuff/himi.asc
(crappy) Homepage: http://himi.org
doe #237 (see http://www.lemuria.org/DeCSS) 
My DeCSS mirror: ftp://himi.org/pub/mirrors/css/