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Message-ID:	<004c01c4f403$6d425740$5308a8c0@robinson.cam.ac.uk>
From:	"Max Bowsher" <maxb AT ukf DOT net>
To:	"Richard Lethin" <lethin AT reservoir DOT com>, <cygwin AT cygwin DOT com>
References:	<41DD5107 DOT 8060002 AT reservoir DOT com>
Subject:	Re: problems with overloading of the semantics of version number in cygwin/unison
Date:	Thu, 6 Jan 2005 15:19:18 -0000
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Richard Lethin wrote:
> There is a problem with the way that cygwin is updating the version
> numbers for cygwin/unison.  Unison is used to synchronize filesystems;
> it can cross different operating systems over IP.  The protocol uses the
> version number to decide whether two processes on different systems will
> communicate.  2.9.1 is the official released version.  There is a beta
> version 2.10.2, but it is not widely deployed.  Thus people (like me)
> will want to use the 2.9.1 version of cygwin's unison.  However, cygwin
> is numbering its instance of this version 2.9.20-1.  When you try to
> communicate using cygwin's 2.9.20-1 with a standard 2.9.1 version of
> unison running on another system, the communication fails after the
> handshake when it discovers that the cygwin version is "2.9.2 [sic]".
> Yes, I think that the handshake is truncating the protocol string.
>
> Anyway, my suggestion is that cygwin update the version of 2.9.1 that it
> is distributing, to separate the overloaded concept of version number
> into a cygwin version number (which could then be arbitrary) and leave
> the protocol number at 2.9.1

No, this is nothing to do with cygwin, and everything to do with unnecessary 
inflexibility in the version checking of unison.

It would be a very bad thing for Cygwin to distribute a version of unison 
which lies about which version it is to the other end of the connection.

This is a problem that needs to be addressed upstream of Cygwin.

Max.


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