warning to deltaiso users running Rawhide

[Toshio Kuratomi]

On Thu, Oct 21, 2010 at 11:33:36AM +0000, Andre Robatino wrote:
> A version of xz (4.999.9-0.3.beta.212.gacbc.fc15) which compresses differently
> from the versions in F11 to F14 was recently pushed to Rawhide. This has the
> side effect of making existing deltaisos not work properly if the newer version
> of xz is installed. (At the end of running applydeltaiso, one would get an
> "md5sum mismatch, iso is corrupt" error, and the ISO would be unusable.) For
> Rawhide users, to use a deltaiso between versions <= 14, do the following:
> 
> 1) temporarily downgrade all xz-\* packages to the F14 versions (currently
> 4.999.9-0.2.beta.20100401git.fc14) which are available in
> http://download.fedoraproject.org/pub/fedora/linux/development/14/{i386,
> x86_64}/os/Packages/. I suggest saving the necessary RPMs in one's home
> directory to make switching easy.
> 
> 2) Run applydeltaiso as usual. If you get an "iso successfully re-created"
> message at the end then all is well.
> 
> 3) Restore the original xz-\* packages (which are necessary for Rawhide's drpms
> to rebuild properly when updating).
> 
> The xz developer says that the new version of xz will not be pushed to F14 and
> below (see https://bugzilla.redhat.com/show_bug.cgi?id=644046 ). I still need to
> update the deltaiso documentation at https://fedoraproject.org/wiki/Delta_ISOs
> and https://fedoraproject.org/wiki/User:Robatino/Downloads . I don't know yet
> exactly how this will affect deltaisos after F14 Final.
> 
Question -- will we need to mass rebuild all Fedora 15 packages with the new
xz so that delta* rpm stuff works?

-Toshio
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