[Test-Announce] Fedora 13 Final TC1 Available Now!

[Andre Robatino]

On 04/30/2010 06:25 AM, Hedayat Vatankhah wrote:
> Well, I'm not going to insist on providing jigdo. However, the situation
> in my mind is this one: I've downloaded Fedora 13 Beta DVD iso
> previously and installed it on my system. Then, I've updated my system
> regularly (using yum presto) and I use yum's "keepcache=1" option. So,
> my Fedora Beta DVD iso + cached updated rpms would provide a
> considerable number of files available in the next DVD iso; so if jigdo
> is available I would probably be able to create the next iso without
> downloading many rpm packages.
> 
> Certainly, the efficiency in this case depend on the installation. A
> minimal installation will not have many rpms and so will not receive new
> versions of most rpms when updating.

That's a good point - if many of the updated RPMs in the new ISO have
already been downloaded and cached, then jigdo/rsync/zsync looks much
better, since most if not all of the exact RPMs in the new ISO are
already available.  If rsync or zsync were available, you could get the
same benefit as jigdo by concatenating your old ISO and all of your new
cached RPMs together into a single large file, and running rsync/zsync
on that to convert it into the new ISO.  Unfortunately, rsync runs on
the server, and turned out to be a resource hog, so it's not currently
used for development images.  Zsync runs on the client so shouldn't have
this problem.  Unfortunately, it's not available in Fedora yet.  See

http://kparal.wordpress.com/2009/09/01/zsync-transfer-large-files-efficiently/

https://bugzilla.redhat.com/show_bug.cgi?id=490140

https://bugzilla.redhat.com/show_bug.cgi?id=495310

Zsync would also be perfect for converting between different install
disc sets (currently the DVD and the CD set) since the packages are
exactly the same.  It can also be used to efficiently convert from the
first disc in either set to the netinst disc.  So I'd certainly like to
see it in Fedora.

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