fallback value in -l flag if field does not exist

[hansbogert]

When dealing with kubernetes manifests it is quite handy to import them with something like:

cue import yaml -l 'metadata.namespace' ...

However, this fails with Cluster wide resources as there is no namespace defined.
Is there a way to fallback to predefined a value? so conceptually as the following:

cue import yaml -l '*metadata.namespace| "_cluster"' ...

[hansbogert]

It starts making sense to translate cue export into cue transform in my head, we can just pre-process:

cue export yaml ... --out yaml schema.cue foo.yaml | cue import yaml: -l 'namespace' -

where schema.cue has:

metadata.namespace: *"_cluster"| string

It's a bit unwieldy but works.

[myitcv]

Another way to "hold" this would be to use the new @embed: #3264

[hansbogert]

Not entirely sure how that would look, but will look into it this looks promising. Will follow up with a new answer