[Buildbot-devel] Locking until buildbot idle?

[Geoff Wedig]

I would like to add a build which only runs if nothing else is running 
on any of the slaves.  My original thought had been to use a lock on all 
steps, but I'm not quite sure it's possible.  I do not want the slaves 
to prevent each other from running, just prevent this new builder, which 
is not running on any of the build slaves.

Can anybody see a way to achieve this?  Everything I have tried so far 
is flawed.  slave locks don't work, because the build in question 
doesn't run on any particular slave, and master locks would prevent the 
slaves from running simultaneously.

One thing I considered is having a separate master lock for each build 
on each slave, then having this new build have all of those locks.  
Unfortunately, some of our builds can run on multiple slaves.  Those 
slaves would still be locked between each other, and since the lock is 
done at the build/step, there's no way of preventing that that I can see.

So, anyone have any brilliant ideas? on how I can solve this?  I really 
need something that will only execute when nothing else is going on.

--
Geoff Wedig
Software Engineer
Digital Domain