d70e7844ba
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. fix field removal in mutating admission webhooks A mutating admission controller webhook doesn't remove object fields when instructed to. E.g. when the JSON patch ``` [ {"op": "remove", "path": "/spec/containers/0/resources/limits/fpga-arria10"}, {"op": "add", "path": "/spec/containers/0/resources/limits/fpga-interface-id-524abcf", "value": 1} ] ``` is applied to this pod ``` apiVersion: v1 kind: Pod metadata: name: test-pod spec: restartPolicy: Never containers: - name: test-pod-container image: ubuntu:bionic imagePullPolicy: IfNotPresent command: [ "ls", "-l", "/" ] resources: limits: fpga-arria10: 1 ``` in order to replace the resource name "fpga-arria10" with something understandable by the device plugin the resulting pod spec still contains the old field plus a new one. The resulting pod looks like ``` apiVersion: v1 kind: Pod metadata: name: test-pod spec: restartPolicy: Never containers: - name: test-pod-container image: ubuntu:bionic imagePullPolicy: IfNotPresent command: [ "ls", "-l", "/" ] resources: limits: fpga-arria10: 1 fpga-interface-id-524abcf: 1 ``` The patch unmarshals patched JSON into a new empty object instead of existing one. Otherwise JSON unmarshaling reuses existing maps, keeping existing entries as specified in the "encoding/json" standard package. **Release note**: ```release-note Webhooks for the mutating admission controller now support "remove" operation. ```
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