[WIP][PATCH] selftest: add clusteredmember (1-node) env

[Martin Schwenke]

On Thu, 14 Jul 2016 14:45:34 +0200, Michael Adam <obnox at samba.org>
wrote:

> On 2016-07-14 at 14:00 +0200, Ralph Boehme wrote:
> > Hi!
> > 
> > On Thu, Jul 14, 2016 at 01:23:39PM +0200, Michael Adam wrote:  
> > > On 2016-07-14 at 12:47 +0200, Michael Adam wrote:  
>  [...]  
> > > 
> > > Attached patch (to be squashed with yours) fixes
> > > the calling of ctdb.  
> > 
> > cool, thanks! I'll give it a whirl.
> > 
> > That approach requires getting the individual test right, ie setting
> > the necessary variables in every test script.
> > 
> > Isn't there a way to do this in a more centralized manner ?  
> 
> Not right now, I'm afraid.
> 
> We should provide a wrapper, and if only for
> selftest. But it needs input where files
> are located. If only the CTDB_BASE one.

I think I've mentioned this part before, but...

In ctdb/tests/simple/scripts/local_daemons.bash we set 2 things:

* CTDB_NODES to point to the nodes file

* CTDB_NODES_SOCKETS to point to the corresponding list of unit domain
  sockets

Then we just use onnode to run "ctdb ..." commands.

onnode respects CTDB_NODES_SOCKETS if it is set and fakes the ssh call
by just setting CTDB_SOCKET.

The advantage of this approach is that onnode is the wrapper and it
already exists.  You can write tests that can be transparently run on
either a real cluster or a bunch of local daemons.

peace & happiness,
martin
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