Re: arch 2.0 first source available (git related)

From: Petr Baudis <pasky@suse.cz>
Date: Jul 11, 2005, 19:39 UTC
Message-ID: <20050711193944.GA5981@pasky.ji.cz>
In-Reply-To: <1120918813.4901.27.camel@dev1.seyza.com>

Dear diary, on Sat, Jul 09, 2005 at 04:20:13PM CEST, I got a letter where Thomas Lord <lord@emf.net> told me that...

> The prereq graph is, indeed, an improvement.

..snip..

But object retrieval can be potentially as much as linear to the depth of the prereq graph, right? I don't think any of the benefits you listed are worth the complication, and you can still do the reachability analysis pretty easily. (And I think it takes the same number of roundtrips when downloading from remote server?)

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> Other advantageous (imo) changes from `git' not mentioned in the
> original message:
> 
> * blobs do not have header lines
> 
>   Git blobs all begin with a line of text declaring the "type"
>   and size of the blob.   That doesn't increase database 
>   verifiability significantly and I found no use for the headers.
>   Having the headers makes it needlessly complicated to translate
>   a file to or from a blob.
> 
>   `revc' does not have blob headers.

In git, this is crucial at least for distinguishing commits and tags. I personally consider the verifiability boost useful.

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> * `revc' uses portable file formats
> 
>    In working dirs, `git' stores binary files which are 
>    endian, word-size, and compiler-environment specific.
> 
>    `revc' stores some binary files too (for performance
>    and simplicity reasons) but uses only portable formats.

I think they are only word-size specific, and that should be no big matter to resolve, shall anyone want to.

Show 5 quoted lines

> * `revc' is shaping up into much cleaner and more portable code
> 
>    (at least compared to the last version of `git' I saw --
>     which was extremely *lucid* code but not terribly
>     clean and not even attempting to be portable.)

All right, the portability could be better. ;-)

Kind regards,

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
<Espy> be careful, some twit might quote you out of context..