On 10/01/2009 03:10 AM, Josephine Tannhäuser wrote: > 2009/9/14 Adam Williamson <awilliam@xxxxxxxxxx> > >> Hi, everyone. We - the QA group - have recently been researching the >> feasibility of using zsync to reduce the size of live image downloads. >> This has hit a roadblock in the form of the problem where both rsync and >> zsync use forked zlibs rather than linking against the system copy. >> > > Imho, allow zsync for fedora. If you can solve the zlib-problem of rsync, > the problem of zsync will be solved as well, cause the integrity of zsync in > fedora fails on rsync-compatibility, which needs a forked zlib. > If you want it in, do the work. I've outlined the possibilities several times: A) You're a coder and want to get your hands dirty with the rsync protocol. Check out how librsync manages to use the system zlib and if possible to do this compatibly, apply it to zsync and rsync, possible as a build time option. Push the changes upstream if possible. If it's impossible to apply the librsync strategy, having a good explanation of what librsync is doing and why it can't work for rsync/zsync would be great for crossing this option off the list. B) You're a sometime coder and good with talking to other people. Try to convince zlib to take the patches from rsync (and the zlib-rsyncable patches while you're at it). zlib has a mailing list that's open to developers and testers of zlib. AFAICS from looking at subjects in the entire archive, neither of these patches have gone to that mailing list. Since the mailing list archives aren't wide open, I'm thinking that the patches went directly to one of the developers mailboxes where it was ignored or forgotten. Getting them to the mailing list would be a good first start. http://zlib.net/mailman/listinfo/zlib-devel_madler.net C) You're a coder and want to be responsible for maintaining a new, more forward moving zlib. Pull the zlib code out of rsync, start a new upstream for it, package it for Fedora. You can also pull other requested features in (like the zlib-rsyncable patches that were in the zlib I just pulled out of deltarpm). Get someone to announce to other distributions that this library exists. D) You're good with build scripts like autoconf and configure and good with talking to other people. Work on the rsync build so that it builds and installs the bundled zlib as a shared library with a new name. Push the changes to the rsync upstream so they maintain the fork. Asking for an exception when: 1) I just spent all of yesterday dealing with a security flaw due to a bundled zlib and 2) a request for an exception has already been turned down is beating on a dead horse with a wet noodle. -Toshio
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