Re: [gentoo-portage-dev] Package compression header for binhosts

[Brian Harring <ferringb@gmail.com>]

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On Mon, May 31, 2010 at 08:32:34PM -0700, Zac Medico wrote:
> Hi,
> 
> In order to support alternative compression types for binhost
> packages, I was thinking about adding support for a header field in
> the Packages index file. For example, a header line like
> "PACKAGE_EXTENSION: txz" could be used to indicate that clients
> should download files with txz extensions instead of tbz2
> extensions. I'm planning to add support for both tgz [1] and txz
> extensions.
> 
> [1] http://bugs.gentoo.org/show_bug.cgi?id=142579

1) requires a version header bump
2) a header alone isn't useful unless it's specifiable per cpv entry; 
thus it must be inheritable
3) PACKAGE_EXTENSION is overly verbose and unclear it's specifying 
the compressor too; it's intention is for compression, state it as 
such (I mention this in light of URI's existance where 
PACKAGE_EXTENSION would only be a hint of compressor)

Re: #1, there is a decent set of optimizations I'm kicking around in 
pkgcore for the next version- a discussion should probably be started 
there.

Offhand, having a compression specific header (a simple enumeration 
of known compressors) and a DEFAULT_URI that is python string 
interpolation  assembled (for example, 
DEFAULT_URI="%(host)s/%(category)s/%(pf)s.txz") seems wiser.  Via 
doing what I'm suggesting, it would be possible to do binpkg 
repository 'views' w/out having to map each binpkg into the url space 
for it.

~harring

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