[openstack-dev] [oslo] upgrade implications of lots of content in paste.ini

Sean Dague sean at dague.net
Thu Feb 18 17:58:26 UTC 2016

On 02/18/2016 12:17 PM, Michael Krotscheck wrote:
> Clarifying:
> On Thu, Feb 18, 2016 at 2:32 AM Sean Dague <sean at dague.net
> <mailto:sean at dague.net>> wrote:
>     Ok, to make sure we all ended up on the same page at the end of this
>     discussion, this is what I think I heard.
>     1) oslo.config is about to release with a feature that will make adding
>     config to paste.ini not needed (i.e.
>     https://review.openstack.org/#/c/265415/ is no longer needed).
> I will need help to do this. More below.
>     2) ideally the cors middleware will have sane defaults for that set of
>     headers in oslo.config.
> I'd like to make sure we agree on what "Sane defaults" means here. By
> design, the CORS middleware is generic, and only explicitly includes the
> headers prescribed in the w3c spec.  It should not include any
> additional headers, for reasons of downstream non-openstack consumers.
>     3) projects should be able to apply new defaults for these options in
>     their codebase through a default override process (that is now nicely
>     documented somewhere... url?)
> New sample defaults for the generated configuration files, they should
> not live anywhere else. The CORS middleware should, if we go this path,
> be little more than a true-to-spec implementation, with config files
> that extend it for the appropriate API.
> The big question I now have is: What do we do with respect to the mitaka
> freeze?
> Option 1: Implement as is, keep things consistent, fix them in Newton.

The problem with Option 1 is that it's not fixable in Newton. It
requires fixing for the next 3 releases as you have to deprecate out
bits in paste.ini, make middleware warn for removal first soft, then
hard, explain the config migration. Once this lands in the wild the
unwind is very long and involved.

Which is why I -1ed the patch. Because the fix in newton isn't a revert.


Sean Dague

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