On Sun, Aug 18, 2013 at 1:59 PM, Stephan Beal <sgb...@googlemail.com> wrote: > On Sun, Aug 18, 2013 at 10:53 AM, Isaac Jurado <dipto...@gmail.com> wrote: >> >> It's about backwards compatibility. Fossil will not generate delta >> manifest on commit unless there already are delta manifest on the >> repository or you force it on the command line. > > > i had no idea there was a --delta option to commit - thanks for that tip. > >> I guess that almost all Fossil binaries in use now understand B cards, >> but as no one has committed to the Fossil repository with the >> "--delta" option yet, you will not find any delta manifest in it. > > > i don't want to be the first one to try ;), but i will use it on my the > libfossil repo for testing. > >> >> Delta manifests are quite interesting because they follow the same >> design concepts as Mercurial's delta storage. I have already >> mentioned it, but I have a Fossil branch that can generate delta >> manifests on import. However, I still don't have any place to publish >> it. > > > i don't yet understand the benefit of a delta manifest except that they save > a few hundred (or thousand) lines of F-cards. > > Do you know if it's possible to have a delta of a delta, or is a delta > always from a non-delta manifest? Parts of the code treat them as if there > can be any number of them (recursive cleanup in manifest_destroy()), but > some parts seem to imply that a delta cannot derive from a delta > (manifest_file_next()).
As far as I've seen, delta manifest cannot be chained. There is a formula in the commit code that determines if a delta manifest is worth using or not. Therefore, when the parent of a delta manifest is also a delta manifest, it will contain the F cards from the parent, plus its own. > If you have a repo with deltas, may i have a copy of it? It would be very > useful for testing my delta manifest code. I tested my improved import branch with the Django git repository, which turned out contain a couple of very interesting cases I wasn't even aware of when developing the first patches. These imported repositories weight almost 200MB, so I think it is better that I manage to publish my branch so you can import whatever you want. -- Isaac Jurado "The noblest pleasure is the joy of understanding" Leonardo da Vinci _______________________________________________ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
