🐛 enable updates from CloudInit (mostly ubuntu) based KCPs to Ignition (flatcar) based KCPs

[bavarianbidi]

What this PR does / why we need it:

Support updates on existing KCPs from CloudInit (Ubuntu) to Ignition (Flatcar)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #8242

[k8s-ci-robot]

Hi @bavarianbidi. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[sbueringer]

/ok-to-test

[sbueringer]

/retest

[sbueringer]

Thx!

/lgtm

I think we should backport this into all supported releases (v1.4, v1.3, v1.2)

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 9968a5fb1a7bb586323acff4b1b4f8d3991df98b

[sbueringer]

/cherry-pick release-1.4

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.4 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.4

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[sbueringer]

/cherry-pick release-1.3

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.3 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.3

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[sbueringer]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.2

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[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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• OWNERS [fabriziopandini]

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #8349

In response to this:

/cherry-pick release-1.4

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #8350

In response to this:

/cherry-pick release-1.3

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[k8s-infra-cherrypick-robot]

@sbueringer: #8339 failed to apply on top of branch "release-1.2":

Applying: support updates from CloudInit to Ignition
Using index info to reconstruct a base tree...
M	controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook.go
M	controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook_test.go
Falling back to patching base and 3-way merge...
Auto-merging controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook_test.go
CONFLICT (content): Merge conflict in controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook_test.go
Auto-merging controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook.go
CONFLICT (content): Merge conflict in controlplane/kubeadm/api/v1beta1/kubeadm_control_plane_webhook.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 support updates from CloudInit to Ignition
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[fabriziopandini]

@bavarianbidi it looks like one of the automatic cherry picks failed, would you like to create a manual cherry pick for the release 1.2 branch?

[bavarianbidi]

@bavarianbidi it looks like one of the automatic cherry picks failed, would you like to create a manual cherry pick for the release 1.2 branch?

@fabriziopandini Yes sure: #8356

[johannesfrey]

/area provider/control-plane-kubeadm