Allow kadet inventory function to return a lazy inventory

[ramaro]

Since the move to the external kadet package, the default inventory function is now strict e.g. if an attribute key is not found the root, it will raise KeyError.
This brings back the original 'lazy' behavior by allowing to call inventory(lazy=True) in the kadet input type

[Moep90]

Using 0.31.0rc0 I now get

My adoption can be found here: Moep90/kapitan-reference@0fb8bab

$ kapitan compile
Rendered inventory (0.25s)
Unknown (Non-Kapitan) Error occurred
multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/home/linuxbrew/.linuxbrew/opt/python@3.7/lib/python3.7/multiprocessing/pool.py", line 121, in worker
    result = (True, func(*args, **kwds))
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/targets.py", line 466, in compile_target
    input_compiler.compile_obj(comp_obj, ext_vars, **kwargs)
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/inputs/base.py", line 56, in compile_obj
    self.compile_input_path(input_path, comp_obj, ext_vars, **kwargs)
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/inputs/base.py", line 78, in compile_input_path
    **kwargs,
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/inputs/kadet.py", line 129, in compile_file
    output_obj = kadet_module.main(input_params)
  File "/home/danny/github-repos/kapitan-reference/components/generators/kubernetes/__init__.py", line 1402, in main
    return globals()[function](input_params)
  File "/home/danny/github-repos/kapitan-reference/components/generators/kubernetes/__init__.py", line 1386, in generate_manifests
    component_manifests = generate_component_manifests(input_params)
  File "/home/danny/github-repos/kapitan-reference/components/generators/kubernetes/__init__.py", line 1267, in generate_component_manifests
    workload = Workload(name=name, component=component)
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kadet/__init__.py", line 44, in __init__
    self.body()
  File "/home/danny/github-repos/kapitan-reference/components/generators/kubernetes/__init__.py", line 755, in body
    workload.add_volume_claims(component.volume_claims)
  File "/home/danny/github-repos/kapitan-reference/components/generators/kubernetes/__init__.py", line 54, in add_volume_claims
    self.root.spec.volumeClaimTemplates += [value]
  File "box/box.py", line 286, in box.box.Box.__iadd__
box.exceptions.BoxTypeError: Box can only merge two boxes or a box and a dictionary.
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/targets.py", line 134, in compile_targets
    [p.get() for p in pool.imap_unordered(worker, target_objs) if p]
  File "/home/danny/.env3_kapitan/lib/python3.7/site-packages/kapitan-0.31.0rc0-py3.7.egg/kapitan/targets.py", line 134, in <listcomp>
    [p.get() for p in pool.imap_unordered(worker, target_objs) if p]
  File "/home/linuxbrew/.linuxbrew/opt/python@3.7/lib/python3.7/multiprocessing/pool.py", line 748, in next
    raise value
box.exceptions.BoxTypeError: Box can only merge two boxes or a box and a dictionary.


Box can only merge two boxes or a box and a dictionary.

[ramaro]

@Moep90 is this using a particular version of generators?

[Moep90]

From my perspective it can be resolved.

Inventory is still more strict. But in a fair amount I guess.
Actions for kapitan-reference can be found here:
kapicorp/kapitan-reference#127 --> Still not finished but this is just an effort question.

[github-actions]

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