important information about coming evolve 6.3.0: update client and server together

[Faheem Mitha]

On Wed, 31 May 2017, Pierre-Yves David wrote:

> TL;DR; 6.3.0 will fix a bug effecting obsmarkers discovery, upgrade client 
> and server at the same time Otherwise push and pull will take more time and 
> more bandwidth.
>
> Hello evolve testers,
>
> We just fixed a small bug in mercurial core affecting the computation of what 
> obsolescence markers need to be synchronized alongside a group of 
> changesets[1]. That will affect the various hashes that the obsmarkers 
> discovery uses to perform its duty. This fix is backported to older version 
> of Mercurial in the next version of the evolve extensions (to be released 
> soon).
>
> As a result, people exchanging obsolescence markers over the wire are 
> recommended to upgrade all their evolve extension installs to 6.3.0 at the 
> same time (client and server alike). Otherwise obsmarkers discovery might 
> fails to detect common set of changeset when client and server uses different 
> versions of the algorithm.This means the discovery process would make more 
> round-trip that usual to detect less common markers than intended. Mercurial 
> then send more obsolescence markers already known on the receiving side.
>
> We are sorry to not provide a smoother update story. The logic fixed in core 
> mercurial is in a function deep into the call stack so providing 
> compatibility is non trivial here. As we are generally short in manpower we 
> prefer to focus our energy on improving other aspect of evolve. If this 
> upgrade prove challenging to you, please reply to this email with details 
> about your setup and we'll see how we can help.

Unless I'm missing something Debian's Mercurial packaging has been at a 
standstill for a while now. The most recent packaging is 4.0.

For people wanting to use packaged versions of Mercurial on Debian, as I 
do, this makes it difficult to upgrade Mercurial, at least. And occasional 
upgrades of Mercurial will be necessary to continue using the Evolve 
extension.

I suppose nobody is currently available to upgrade the Mercurial 
packaging. Does anyone know the situation here?

Regards, Faheem Mitha