[CentOS-devel] deltarpm and presto for centos

Jeff Johnson n3npq at mac.com
Sun Nov 15 18:44:28 UTC 2009


On Nov 15, 2009, at 1:30 PM, Farkas Levente wrote:

> 
>> As for presto and courgette, I'll respond to that at:
>> https://bugzilla.redhat.com/show_bug.cgi?id=512515
> 
> ok i respond there too.
> 

FWIW, there are deep fundamental design issues wrto Courgette
that have nothing to do with with whether Google is choosing Courgette
for Chromium peculier updates.

For starters:

1) RFC 3229 at http://www.rfc-editor.org/rfc/rfc3229.txt

	This is what subversion uses (afaik) instead of xdelta
	While I privately like xdelta _A LOT_ and I think
	that Josh McDonald's master's thesis, and xdelta[123] are
	the cat's pajama's, xdelta code is quite obscure and
	hard to justify deploying generally. YMMV, everyone's does, but
	(objectively) subevrsion chose vdelta rather than xdelta
	because xdelta code is insanely difficult and uncommented,
	and uses vdelta (ala RFC 3229) instead.

2) disassembling code to remove pointer entropy (as in Courgette)
maye be a win for executables, but is not generally useful for presto
(or packaging).

There are other issues, but its entirely unclear whether Courgette
is The Right Answer for presto and deltarpm's atm.

Disclaimer: YMMV, everyone's does.

73 de Jeff
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