How do delta RPMs work at the server end?

Question

Here's a question and answers on what delta RPMs actually are: What is DRPM and How does it differ from RPM?

I'm interested in the algorithms and data structures server side. I've Googled but nothing useful shows up.

Do they (Red Hat) generate the requested delta on the fly, or are all possible deltas pregenerated and made available as soon as a new RPM comes out?

Other than makedeltarpm? – Ignacio Vazquez-Abrams May 31 '18 at 16:56 — Ignacio Vazquez-Abrams, May 31 '18 at 16:56

score 0 · Accepted Answer · answered Jun 06 '18 at 12:31

0

Deltas are generated when repo is created/updated. Usually:

createrepo_c --update --deltas --num-deltas 1 .

For more information see man createrepo_c and man makedeltarpm

answered Jun 06 '18 at 12:31

msuchy

This answer really doesn't go too much in details especially about the second part of the question "are all possible deltas pregenerated and made available as soon as a new RPM comes out?". – pbm Jan 13 '20 at 12:39

1 Answers1