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`getK8sVersionFromUserInput` would attempt to load the config from a user specified YAML file (via the `--config` option of `kubeadm upgrade plan` or `kubeadm upgrade apply`). This is done in order to fetch the `KubernetesVersion` field of the `ClusterConfiguration`. The complete config is then immediately discarded. The actual config that is used during the upgrade process is fetched from within `enforceRequirements`. This, along with the fact that `getK8sVersionFromUserInput` is always called immediately after `enforceRequirements` makes it possible to merge the two. Merging them would help us simplify things and avoid future problems in component config related patches. Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>