status of forked zlibs in rsync and zsync

Adam Williamson awilliam at
Mon Sep 14 21:33:59 UTC 2009

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.

It seems there was a flurry of activity surrounding this problem in
April through June - see:

but everything seems to have gone quiet since then. At present we are
still in the contradictory and unsatisfactory position of shipping rsync
with an internal forked zlib but refusing to accept zsync as a package
because it does exactly the same thing.

I just wondered if there's a roadmap for where we go from here, or if
the issue is just sitting idle waiting for someone to apply a kick to
it :) Can you guys clarify what's happening with this? Thanks!

(kparal - Kamil Paral - is the QA team member who's been investigating
the usefulness of zsync).

Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org

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