On 2/25/2016 5:35 PM, Angus Lees wrote:
On Fri, 26 Feb 2016 at 01:28 John Garbutt <j...@johngarbutt.com
<mailto:j...@johngarbutt.com>> wrote:

    Agreed with the concerns here, but I thought these are the same we
    raised at the midcycle.


Yes, afaik everything is exactly as we discussed and following the
direction we agreed at Nova+CInder mid-cycles.

In hindsight, we probably should also have nominated 2x cores from each
of cinder/nova who were willing to be aware of the situation and review
the resulting change - before actually embarking on the work.  As it is,
the clock is striking noon and the street suddenly contains nothing but
tumbleweeds :-P

  - Gus


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I stared pretty hard at the nova rootwrap filter change today [1] and tried to keep that in my head along with the devstack change and the changes to os-brick (which depend on the devstack/cinder/nova changes). And with reading the privsep-helper command code in privsep itself.

I realize this is a bridge to fix the tightly couple lockstep upgrade issue between cinder and nova, but it would be super helpful, at least for me, to chart out how that nova rootwrap filter change fits into the bigger picture, like what calls what and how, where are things used, etc.

I see devstack passing on the os-brick change so I'm inclined to almost blindly approve to just keep moving, but I'd feel bad about that. Would it be possible to flow chart this out somewhere?

I also have a concern in there about how the privsep-helper rootwrap command in nova is only using the os-brick context. What happens if os-vif and nova need to share common rootwrap commands? At the midcycle Jay and Daniel said there weren't any coming up soon, but if that happens, how do we handle it?

[1] https://review.openstack.org/#/c/277670/5/etc/nova/rootwrap.d/compute.filters

--

Thanks,

Matt Riedemann


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