User Story

As a user I want the GCP machine actuator to recognize Windows instances during creation so that they can get the proper user data needed for booting.

Background

When creating Windows instances on GCP, a special user data entry is needed so that the instance will properly boot and become a node.

As referenced in the parent epic, there is a special powershell or batch script which must be inserted into the sysprep-specialize-script-ps1 key of the metadata. In practice, this involves creating the key/value pair for sysprep-specialize-script-ps1 in the metadata field of the provider spec for GCP. Note that this is not the object metadata and is instead the serialized gcpMetadata, see https://github.com/openshift/api/blob/master/machine/v1beta1/types_gcpprovider.go#L56

Steps

• add some detection code to the machine actuator for windows machines
• when windows is detected, add the sysprep-specialize-script-ps1 metadata key with the value being a script that is read from a user-defined configmap

Stakeholders

• cloud team
• winc team

Definition of Done

• add detection code and replacement logic

• Docs

• there should be a gcp windows machineset docs page that will need to be updated with how this mechanism works

• Testing

• unit tests should be added to ensure proper records
• integration testing should be done as part of the larger winc on gcp story