Ah, apologies.  Will move discussion over.

On Friday, December 27, 2013 9:42:05 AM UTC-5, Michael DeHaan wrote:
>
> I was suggesting this be posed on ansible-devel list btw, will let you 
> post there and we can discuss.
>
> -- Michael
>
> On Dec 27, 2013, at 7:15 AM, "[email protected] <javascript:>" <
> [email protected] <javascript:>> wrote:
>
> RE: https://github.com/ansible/ansible/pull/5430
>
> The intent here was to make it possible for users of the ec2 inventory 
> module to be able to directly address hosts using groups in the format of 
> '<tag>=<value>'
>
> The patch does not change existing behavior, and keeps the legacy format 
> of host groups for tags to look like 'tag_<tag>_<value>' by default.
>
> Say I have a tag named 'role' across some subset of instances, and the 
> value of this tag can be set to things like 'builder', 'packer' or 
> 'shipper'.
>
> Using the ec2 inventory plugin as is, to run a playbook across all host 
> instances whose 'role' tag is set to 'builder', one would need to:
>
> ansible-playbook -i ./inventory ./playbooks/builders.yml -l 
> tag_role_builder
>
> It would be nice to simply be able to do:
>
> ansible-playbook -i ./inventory ./playbooks/builders.yml -l role=builder
>
> And now you can also define your playbooks to have:
> ----
> hosts: role=builder
> ....
>
> That's all this pull request does, with no impact on backwards 
> compatibility.
>
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