[Container-tools] Templating in Atomic App & xpath like params

[Václav Pavlín]

Hi Daniel,

To understand what's needed for

https://github.com/projectatomic/nulecule/issues/70

you will want to look at this method:

_applyTemplate() - 
https://github.com/projectatomic/atomicapp/blob/master/atomicapp/run.py#L101

And in connection to that at

_processArtifacts() - 
https://github.com/projectatomic/atomicapp/blob/master/atomicapp/run.py#L121

where the apply function is called.

To simply describe the code - it goes through the graph and it 
substitutes values from params/answers for each component for a specific 
provider in each artifact.

Should you have more questions, feel free to ask.

Regards,
Vašek

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