On Wed, Jul 16, 2003 at 01:16:18PM +0200, Ralf S. Engelschall wrote: > On Wed, Jul 16, 2003, Matthias Kurz wrote: > > > [...] > > The best approach, from my point of view, would be to make the rpms more > > "rsync-friendly". I thought about hacking rsync, so that it can ignore > > parts of a filename and recognize, when two files are very similiar. > > But a few random tests (using xdelta) showed that the differences between > > two versions where quite large. Hmmm, maybe i picked always packages, > > where the vendor sources changed ? Or is it, because some parts of the > > rpm are compressed as a whole ? I always had better results doing the > > xdelta before compression. > > OpenPKG .src.rpm's are actually CPIO archives of the source files (.spec > plus .patch files plus vendor tarballs, etc) which are compressed via > bzip2(1) and with an RPM header in front of the result. Either the > compression is your problem or/and the fact that AFAIK the source files > are not inserted into the CPIO payload in the same order each time. > > > Just tried python-2.2.3-20030716.src.rpm and python-2.2.3-20030714.src.rpm. > > A direct xdelta gives a delta of 6727215 bytes. Converting the rpms with > > rpm2cpio and doing a xdelta on the resulting cpio archives gives a delta of > > 373 bytes. > > A clear indication that the compression is the problem. > > > When i rename python-2.2.3-20030716.src.rpm to python-2.2.3-20030714.src.rpm > > and use rsync, i get > > wrote 6743450 bytes read 36 bytes 13486972.00 bytes/sec > > total size is 6742530 speedup is 1.00 > > > > Looks, like there is room for improvement. Except i did something wrong. > > I think because of the compression you have no chance. The best solution > for all this, as I already mentioned, to roll the .src.rpm yourself from > the parts.
Given someone can reproduce my results i would prefer to try to modify rpm and rsync. I don't think this is much more complicated than building my own rpm factory for the "official" parts. For my own things i have to do it anyway, but that is easier, i think. (mk) -- Matthias Kurz; Fuldastr. 3; D-28199 Bremen; VOICE +49 421 53 600 47 >> Im prämotorischen Cortex kann jeder ein Held sein. (bdw) << ______________________________________________________________________ The OpenPKG Project www.openpkg.org User Communication List [EMAIL PROTECTED]
