preventing md5 mismatch errors from compression changes

[Toshio Kuratomi]

On Sun, Nov 21, 2010 at 05:41:35PM +0000, Andre Robatino wrote:
> The recent change in xz compression settings caused md5 mismatch errors in
> rebuilding RPMs (since applydeltarpm doesn't know the difference between the old
> and new compression). This resulted in significant work for releng. To avoid
> this issue in the future, what about using different names and packages for the
> different compression types (i.e., xz1, xz2, etc.) so they can be installed
> simultaneously and identified properly? The xz packages are small, and using
> separate packages should hopefully mean little to no extra work for the
> maintainer. The same method could be used in the future for any new compression
> type that replaces xz.
> 
> http://lists.fedoraproject.org/pipermail/devel/2010-October/144651.html
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=644046
> 
> https://fedorahosted.org/rel-eng/ticket/4224
> 
This could require different naames for the library too which will get a bit
harder than just the binary name.

-Toshio
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