On 09/14/2009 12:05 PM, John Reiser wrote:
>> Deltaisos are capable of saving roughly half the download size in
>> going from Fedora N to Fedora (N+1), but only work for installation
>> images, not live images. Is there any form of delta compression for
>> live images which is competitive with this?
>
> It hasn't been productized, but approximately:
> unsquashfs old-Live.img old-Live.tree # local ("slave")
> unsquashfs new-Live.img new-Live.tree # remote ("master")
> rsync remote:new-Live.tree local:old-Live.tree # "delta
> compression" happens here
> mksquashfs old-Live.tree new-Live.img # local
Has anyone tried this on existing live images to see how much is saved
(say going from a Fedora N to Fedora (N+1) Live CD)? I'm skeptical that
rsync, which is completely general, would be as efficient as something
specialized such as {make,apply}deltaiso. It may be necessary for
someone to create a specialized tool for delta compression between live
images, in order to be able to compress as well as deltaisos currently
do for the install images.
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