Fedora and Red Hat Leftovers
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Removing support for DeltaRPMs in Fedora
Way back in 2009, we looked at the presto plugin for yum, which added support for DeltaRPMs to Fedora. That package format allows just the binary differences (i.e. the delta) between an installed RPM and its update to be transmitted, which saves network bandwidth; the receiving system then creates the new RPM from those two pieces before installing it. Support for DeltaRPMs was eventually added to the distribution by default, though the feature has never really lived up to expectations—and hopes. Now, it would seem that Fedora is ready to, in the words of project leader Matthew Miller, ""give DeltaRPMs a sad, fond farewell"".
Miller raised the question of retiring DeltaRPMs in a February 21 post to the Fedora devel mailing list. He pointed to a five-year-old open bug report that described problems with retaining the .drpm files for packages due to the way the Pungi distribution composer works. Miller also noted that a thread from 2021 discussing "deltarpm usefulness?" did not come to any firm decision.
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