[Bug 1300768] Re: Rsync fails with (very) old server.

[Robie Basak]

Thanks! It's not completely clear to me. Did you find that the latest
git HEAD does have the problem? If so, then it looks to me that this is
either an upstream bug or done by design upstream. For both of those
cases, I don't think we'll be able to do anything about this in Ubuntu
directly, but we could cherry-pick something from upstream if they
decided it was a bug and fixed it.

Alternatively, is there some other solution you have in mind?

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https://bugs.launchpad.net/bugs/1300768

Title:
  Rsync fails with (very) old server.

Status in “rsync” package in Ubuntu:
  New

Bug description:
  
  Does not work: 
  Trusty Tahr. 
  Rsync version 3.1.0
  Protocol version 31

  DOES work: 
  Saucy
  rsync version 3.0.9
  protocol version 30

  
  In both cases: "server side":
  Suse 7.0
  version 2.3.2  
  protocol version 21

  with both "client" side rsyncs I of course get: 
  > Server is very old version of rsync, upgrade recommended.

  but with the newer rsync I get:

  Warning: No xauth data; using fake authentication data for X11 forwarding.
  Server is very old version of rsync, upgrade recommended.
  protocol version mismatch - is your shell clean?
  (see the rsync man page for an explanation)
  rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
  rsync error: error in rsync protocol data stream (code 12) at io.c(226) [Receiver=3.1.0]

  According to the manpage I can test the "is your shell clean" with 
    ssh oldserver /usr/bin/true > out.dat
  but I get a clean file (0 bytes). 

  I just checked: the "no xauth data" doesn't matter:

    rsync -e "ssh -x" vsuse:/etc/issue .

  has the same problems.

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