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Excerpts from Davanum Srinivas (dims)'s message of 2015-12-17 10:59:03 -0500:
> Thierry,
> 
> Right, i believe it was on IRC and not a ML thread. Since there is no
> urgency on this one, we can wait till Doug gets back to revisit the
> decision.

When we started removing more modules from the incubator back-porting
fixes became more challenging. If a module is in the incubator at
the start of a cycle, but graduates and is removed, there's no file
to receive the fix in a stable branch. Furthermore, the fix might
originate in a library module that has changed significantly since the
incubator version, especially if the file was split up to hide some
symbols that are meant to be private in the library.

So we changed the back-port policy to (1) fix the code in the latest
upstream version (lib or incubator), then (2) update the application
master branch (if an incubator sync is needed), then (3) re-create
the fix in the stable version of the library or application (depending
on what's appropriate for the given change).

It looks like I failed to update the documentation to describe this
process change [1].

Doug

[1] http://specs.openstack.org/openstack/oslo-specs/specs/policy/incubator.html#stable-branches

> 
> Thanks,
> Dims
> 
> On Thu, Dec 17, 2015 at 7:50 AM, Thierry Carrez <thierry at openstack.org> wrote:
> > Matt Riedemann wrote:
> >> On 12/13/2015 10:33 PM, Robert Collins wrote:
> >>> On 14 December 2015 at 15:28, Matt Riedemann
> >>> <mriedem at linux.vnet.ibm.com> wrote:
> >>>> I don't have a pressing need to backport something right now, but as
> >>>> long as
> >>>> there was code in oslo-incubator that *could* be synced to other
> >>>> projects
> >>>> which wasn't in libraries, then that code could have bugs and code
> >>>> require
> >>>> backports to stable/liberty oslo-incubator for syncing to projects
> >>>> that use
> >>>> it.
> >>>
> >>> I thought the thing to do was backport the application of the change
> >>> from the projects master?
> >>
> >> Unless the rules changed, things from oslo-incubator were always
> >> backported to stable oslo-incubator and then sync'ed to the stable
> >> branches of the affected projects. This is so we wouldn't lose the fix
> >> in stable oslo-incubator which is shared across other projects, not just
> >> the target project consuming the fix from oslo-incubator.
> >
> > I think I remember that the Oslo crew made a change there for the last
> > branch before incubator removal (something like, "backport it directly
> > to the local copy"). I couldn't quickly find a thread reference though.
> > Maybe wait for Doug or dims to be around and chime in.
> >
> > --
> > Thierry Carrez (ttx)
> >
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