Description of problem: yum-presto only shows the savings after downloading. Ideally, the download size should reflect the total of delta RPMs instead of the full RPM's if yum-presto is installed.
The only way we can really do that is to integrate presto, which has a number of benefits: 1. Can give real download total. 2. Can rebuild drpms => rpms, while we are downloading rpms. 3. We can much more easily do "clever" things with reposync, Eg. use the old rpms on disk. 4. If we get the Avahi stuff going again it sucks a lot to have two "download-helper" plugins, because they can't co-operate. ...but this is going to be a longer term feature.
Makes sense. Would this solve the issue of generating metadata deltas as well or should I file a RFE on that separately? For smaller updates currently the metadata size is often bigger than that of the packages themselves.
File a different BZ for that (the major problems there are all server side, so you'll want to do it against presto or createrepo), but be warned there be dragons there :).
Closing, as yum-presto was integrated into yum. There are a number of other open yum-presto bugs that must be either closed or reassigned.