I was trying to determine what Galera version I have, and asked for advice on how to do that in codership group, and they said:
>> So it shows:
>>
>> wsrep_provider_version | 2.2(r115)
>well, in the hindsight I'm actually not sure which repository Percona
>uses to build Galera from, hence revision information may be
i>ncompatible with the official Codership LP repository. I think you need
>to ask Percona about the details. This one is definitely not official
>2.2 and I'm not sure where the revision number comes from (official 2.1
>is r129 and official 2.2 is r137 and this one is clearly taken in
>between).
Mike E.