A more efficient up2date service using binary diffs

[Alexandre Oliva]

On Mar 17, 2005, Alan Cox <alan at redhat.com> wrote:

> On Thu, Mar 17, 2005 at 12:26:04PM +0000, Nigel Metheringham wrote:
>> with jigdo templates), and even better the CD images too although it may
>> be harder to do this with legacy expectations.  Every Fedora
>> distribution is currently triplicated - unpacked, CD isos and DVD isos
>> all containing the same data.

> This looks an interesting MSC project for someone - to write a user space
> (FUSE) Jigdofs so you can magic the CD and DVD images out of thin air.

The attached scripts could be a starting point.  The rsync batch to
create the DVD out of the CD isos is only 60MB, and the other way
round creates ~15MB files.  Reconstructing a tarball of the x86_64
SRPMS given the i386 SRPMS takes about 60MBs too.

I have other scripts (not posted) to extract file lists from isos and
create rsync-priming isos out of a local copy of rawhide.  However, I
didn't see much point in pursuing this for this case, given that it's
a pain to obtain the exploded tree in the first place, unless you
happen to have access to an rsync server offering them.  It's far more
network-efficient to obtain the isos and then explode them, than the
other way round.

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}