Show subcommand:
This is large change that accomplishes a number of goals. First, there
was no convenient way to show a build plan without using the debug logs
to indentify the tags to inject, then calling the cue command with the
right incantation to inspect the BuildPlan.
This patch addresses the problem by adding a `holos show buildplans`
command. The command loads the Platform spec from the platform
directory, then iterates over all Components to produce the BuildPlan.
This patch adds labels and annotations to the platform Components
collection in order to select and filter the output.
Result:
```
❯ holos show components --selector app.holos.run/cluster=local --format=yaml | head
kind: BuildPlan
apiversion: v1alpha5
metadata:
name: podinfo
spec:
artifacts:
- artifact: clusters/local/components/podinfo/podinfo.gen.yaml
generators:
- kind: Helm
output: helm.gen.yaml
```
---
Interface refactor:
This refactors the interface between the `holos` Go CLI layer and the
various core schema data structures. We now use a proper Go interface.
Concurrent execution over platform components has been improved to
accept a closure function so we can use the same interface method to
process the components. We use this to show each component and render
each component from different subcommands using the same interface
embedded in the builder.Platform struct.
The embedded interface allows us to easily swap in different versions,
e.g. v1beta1 and eventually v1. The number of interface methods are
quite small. 14 methods across 4 interfaces in holos/interface.go.
---
Remove old versions:
This patch removes support for versions prior to v1alpha5 in an effort
to clean up cruft.
Previously methods were defined on the API objects in the v1alpha1 API.
The API should be data structures only. This patch refactors the
methods responsible for orchestrating the build plan to pull them into
the internal render package.
The result is the API is cleaner and has no methods. The render package
has corresponding data structures which simply wrap around the API
structure and implement the methods to render and return the result to
the CLI.
This commit compiles, but it has not been tested at all. It's almost
surely broken completely.
