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Hello,

> Problem: what about deployment specific parts
> Template string in config? %imageid% or similar?
> Image name regex, rather than image name? so can work with multiple  
> deployments, eg ^cirros$


so we have a few solutions for today: function, vars, and "special args".


FUNCTION
========
args: {"image_id": {"$func": "img_by_reg", "$args": ["ubuntu.*"]}}

Flexible but configuration looks complex.

VARS
====
vars : {
     $image1 : {"$func": "img_by_reg", "$args": ["ubuntu.*"]},
     $image2: {"$func": "img_by_reg", "$args": ["centos.*"]}
}
args: {
    image_id: $image1,
    alt_image_id: $image2
}

This may be an addition to the first solution, but personally to me it
looks like overkill.

SPECIAL ARGS
============
args: {"image_re": {"ubuntu.*"}}

Very simple configuration, but less flexible then others. IMO all three may
be implemented.

I vote for "special args", and IMO functions may be implemented too.
Please feel free to propose other solutions.

-- 
Regards,
Sergey Skripnick