linux-kernel - Re: Smaller compressed kernel source tarballs?

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Date:	Mon, 25 Sep 2006 08:47:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Paulo Marques <pmarques@...popie.com>
CC:	Michael Tokarev <mjt@....msk.ru>,
	Johannes Stezenbach <js@...uxtv.org>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Dax Kelson <dax@...ulabs.com>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: Smaller compressed kernel source tarballs?

Paulo Marques wrote:
> H. Peter Anvin wrote:
>> Michael Tokarev wrote:
>>> [...]
>>> On the site it's said lzma(sdk) is under rewrite to support
>>> new format with magic number and crc checks...
>>
>> That is an absolute must, IMO.  I would use the gzip format as a base.
> 
> If you're suggesting a gzip like format (but with different magic, 
> etc.), that's ok.
> 
> However, it has been suggested on similar threads to use the CM field of 
> the gzip format to introduce different compression methods.
> 
> While this is the purpose of this field, I find this to be a very bad 
> idea. The worse part of it is that, after "lzma gzip" files start to 
> proliferate, you never know if you can decompress a .gz with your 
> version of gunzip, which is something that you currently have for granted.
> 
> If more formats start being supported inside gzip, this only gets worse...
> 

Doesn't mean that one should name the files .gz.

A more significant reason to not do this is that I think there are a lot 
of programs out where which only check the magic number and not the 
compression format.

	-hpa
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