Mail Archives: cygwin/2005/01/06/10:39:07
Max Bowsher wrote:
> 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.
Sure, it's a bad design choice in unison, but cygwin is using the
version number in Unison - which means something about the protocol
version in unison - to mean something about the software release - which
operationally is not what unison really means. The result is that
cygwin unison is broken.
>
> This is a problem that needs to be addressed upstream of Cygwin.
Whatever.
>
> Max.
>
--
Richard Lethin
Reservoir Labs, Inc.
+1-212-780-0527 ext. 102
www.reservoir.com
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