[Bug 10532] New: Rsync fails with older version.

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=10532

           Summary: Rsync fails with older version.
           Product: rsync
           Version: 3.1.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: r.e.wolff at bitwizard.nl
         QAContact: rsync-qa at samba.org


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.

The Ubuntu guys asked me to report this here.... 
I used "git bisect" for the first time. The commit that caused this problem is: 

[8b3e60523aa3d86583a1df54c81c9d480ea19740] Improved the fix that ensures that
the generator gets notified about an I/O error for the incremental directory
that generated the error. The PROTOCOL_VERSION was bumped to 31 to implement
this.

See https://bugs.launchpad.net/ubuntu/+source/rsync/+bug/1300768 for my
original ubuntu bugreport. (but mostly copy-pasted here).

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