Excerpts from John Garbutt's message of 2015-06-01 12:26:48 +0100:
> On 29 May 2015 at 22:38, Doug Hellmann <[email protected]> wrote:
> > As with our other semver projects, we will use pbr’s interpretation of the 
> > semver rules (http://docs.openstack.org/developer/pbr/semver.html) for 
> > minor updates and patch releases. I don’t believe we discussed whether to 
> > increment the major version during each cycle as we have been doing. Under 
> > the semver rules that would indicate incompatibility, and we may not want 
> > to signal that arbitrarily. We should discuss that further leading up to 
> > the M summit, when we start preparing for the *next* cycle.
> 
> Given how Nova deals with upgrades, we basically want a way to say you
> need to upgrade to <kilo>.X before (live) upgrading to <liberty>.x (it
> allows us to drop some live upgrade compatibility code each release).
> I like the idea of bumping the major version to communicate that.
> 
> Its not quite a "public API incompatibility" but its a very useful bit
> of information, with very similar consequences? But maybe that bends
> the semantics of semver too much? To be clear, I don't want 12 =
> liberty, it ties projects down to when they can indicate
> incompatibility. ttx's tool sound like it should fix the issues around
> that, to some extent.

It does communicate incompatibility, and it's not arbitrary (which is
what I was worried about if we just said we would bump the major version
each cycle automatically). So it makes sense to me as a reason to bump.

> 
> > We will still use stable branches, and stable release versions will follow 
> > the same rules so it should always be clear what versions are upgrades of 
> > what previous releases.
> 
> Given the previous discussions on the stable branch, should we
> actually bump x automatically for every commit, where x is 12.0.x? For
> projects like Nova where we (currently loosely) consider every commit
> to be a release? Or maybe it should still be something like
> 12.0.0.a1.dev%(x)d, although that probably makes the six monthly
> milestones too prominent.

pbr generates versions like x.y.z.postN on each commit now, indicating N
commits since the x.y.z tag. So I think we're OK with version numbers
without having to do any tagging explicitly.

> 
> > Please let me know if you think I missed any details, or misunderstood 
> > something as agreed to. Or, of course, if you weren’t there and see 
> > something wrong with the plan after looking at it now.
> 
> I wasn't there, due to the Nova meetup at the same time, but I like
> the idea of adopting semver for the server projects.
> The old scheme was very much documenting the integrated release.
> 
> Thanks,
> John
> 

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