I was asked to weigh in on https://pagure.io/releng/issue/7215 as a
priority. Last time we talked about this we didn't really get anywhere...
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/JYKVELSBJQMEK6KEFXG354ZDZDDX4C5G/#RLEUYSWOUVUS53YAP7WQQNN7HNEBIC4E
... and that ticket hasn't moved, because fixing it isn't trivial.
What we're doing now — as has been the case for several years, already noted
in the previous discussion — has very little end-user value. Also as noted
in that thread (as in the ticket)... that's unfortunate, because it did
bring some real benefits (and could possibly do even more.)
But, I think it's time to move on. We have ostree and various
container-delta approaches. We should focus on those — and give DeltaRPMs a
sad, fond farewell.
The last updates just now on three different machines gave me
Delta RPMs reduced 284.9 MB of updates to 281.0 MB (1.4% saved)
Delta RPMs reduced 14.3 MB of updates to 3.3 MB (76.9% saved)
and the third had no Delta RPMs
Outside of specific instances, the first or last results are typical. I think it is time to say goodbye. Times are very different from what they were when we added support.
Dennis