Comment # 7 on bug 959917 from Wolfgang Rosenauer

(In reply to Andreas Stieger from comment #5)
> (In reply to Wolfgang Rosenauer from comment #1)
> > BTW, what it should actually require is "socat" because this is used
> > internally by xtrabackup (just a sidenote)
> 
> I completely failed to find socat in the xtrabackup code base?

hmm, you are right. I mixed two things up :-(
xtrabackup itself does not use socat. It is wsrep_sst_xtrabackup-v2 as
delivered by galera database software doing so:

2015-12-21 16:40:41 140496269735680 [Note] WSREP: Running:
'wsrep_sst_xtrabackup-v2 --role 'joiner' --address '10.0.0.231' --datadir
'/srv/dbdata/db1/'   --parent '17819' --binlog 'mysql-bin' '
WSREP_SST: [INFO] Streaming with xbstream (20151221 16:40:42.542)
WSREP_SST: [INFO] Using socat as streamer (20151221 16:40:42.543)
which: no socat in
(/usr/sbin:/sbin:/usr//bin:/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/games)
WSREP_SST: [ERROR] socat not found in path:
/usr/sbin:/sbin:/usr//bin:/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
(20151221 16:40:42.545)

So I guess it's fine to leave this dependency to database software packages.
Sorry for the noise.