Re: running ditto from firefox on snow leopard
Re: running ditto from firefox on snow leopard
- Subject: Re: running ditto from firefox on snow leopard
- From: Jean-Daniel Dupas <email@hidden>
- Date: Wed, 27 Jan 2010 10:03:23 +0100
Le 27 janv. 2010 à 09:34, Joel Reymont a écrit :
>
> On Jan 27, 2010, at 8:29 AM, Jean-Daniel Dupas wrote:
>
>> wrong, partial update do not prevents codesign. Especially as the partial update can contains the updated code signature.
>
> Can partial updates preserve compression on Snow Leopard?
>
> How does Apple do this?
>
> In other words, can we deliver a compressed Firefox for Snow Leopard -and- deliver compressed updates as well? I gather that the objection is to compress Firefox post-installation.
>
Apple uses pkg to distribute their software and their updates. They don't have to support system older than the target one (as they distribute one package by major version if when needed), and the pkg format supports HFS compression (a class-dump of the private PackageKit reveal a useHFSPlusCompression property in PKPackageInfo), but as I avoid pkg as much as I can, I don't know if this is a public features and how to use it.
-- Jean-Daniel
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