This adds a `reconcile` package with the reconciliation and (status)
observation logic for individual Helm actions, but no glue to loop
through them till desired state.
All actions have individual `ActionReconciler` implementations which
construct their `action.Configuration` out of a factory, so the Helm
client can be shared between sub-reconcilers. They all present a
`ReconcilerType`, allowing an iterator to e.g. stop after running
every type just once.
The observation model can be explained as follows, but may lack some
minor details:
- The observed release has to match the release target of the
HelmRelease object
- ActionReconcilers of type "release" move Current to Previous
when they see a higher release revision. They then write the
new release to Current, and continue to observe writes to
revisions that match either version
- Remediation only updates Current
- Test updates Current and Current.TestHooks
- Unlock updates Current
After running the action, the reconcilers observe both the action
result and the state of the object. This allows them to distinguish
certain types of errors which are otherwise hard to detect.
For example, errors which do not cause drift to the Helm storage, or a
change of release version compared to Current for actions which do not
provide a version target flag.
Signed-off-by: Hidde Beydals <hello@hidde.co>
d9055f81b8