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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