adaptation: return nil as no-op adjustment. #118
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Don't create an empty adjustment a priori. Only create once a plugin makes an adjustment to the container being created. In particular, this should result in a nil adjustment if no plugin touches a container. Signed-off-by: Krisztian Litkey <[email protected]>
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With no NRI plugins registered or none of the registered plugins requesting changes to a container, we should ideally skip applying NRI adjustments on the runtime side altogether, instead of going through the motions without any effective changes. Having seen #117 (quickly fixed by #116), this is not the case.
This PR is the first part in an attempt to change that. With this PR in place, we don't create an a priori empty adjustment in preparation to process NRI requests. We only create it once a plugin makes an actual change to the container being created. Effectively, this should result in a nil adjustment reply when there are no plugins present, or none of the present plugins touches a container.
The other part is a related change to the runtime integration code to check for this and short-circuit processing.