[ARO] az aro update: Fix update for clusters created with subnets that are now deleted
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Related command
az aro updateDescription
The current implementation of the
ensure_resource_permissionsfunction, called duringaz aro createandaz aro update --refresh-credentials, and which is responsible for ensuring an ARO cluster's service principal has the required permissions over the cluster's network resources (vnet, subnet, route tables, NAT Gateways, NSGs), has a bug where if a cluster was either created with a specific subnet provided for the worker nodes that has since been deleted, or the cluster currently has an invalid machineset pointing to a nonexistent subnet (e.g. following the instructions in https://learn.microsoft.com/en-us/azure/openshift/howto-segregate-machinesets incorrectly), we will fail to ensure the required resource permissions over this nonexistent subnet. We retrieve each subnet to obtain the resource IDs of any attached route tables, NAT gateways, and NSGs, in order to ensure we have the required role assignment scoped to that resource.This PR changes the above approach to skip any such subnets, allowing this process to complete successfully. We expect all passed-in subnets to exist at cluster creation time, so this change should only impact
az aro update(other validation during the creation process ensures that all passed-in subnets exist).Testing Guide
In order to reproduce this scenario, one would need to create an ARO cluster, and then create a machineset pointing to an invalid subnet, by following https://learn.microsoft.com/en-us/azure/openshift/howto-segregate-machinesets. The
az aro updatecommand should work successfully with this change applied.History Notes
[ARO]
az aro update: Ensure that refreshing cluster service principal credentials is successful when the cluster has an invalid or missing subnet in its resource definitionThis checklist is used to make sure that common guidelines for a pull request are followed.
The PR title and description has followed the guideline in Submitting Pull Requests.
I adhere to the Command Guidelines.
I adhere to the Error Handling Guidelines.