Add support for detaching and reattaching boot disks instances for google_compute_instance

[chefbc]

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Description

Hello, Looking to implement detach-reattach-boot-disk gcp feature similar to compute_attached_disk that is already implemented.

https://cloud.google.com/compute/docs/disks/detach-reattach-boot-disk https://www.terraform.io/docs/providers/google/r/compute_attached_disk.html

New or Affected Resource(s)

• google_compute_instance boot_disk attached_disk detached_disk

References

https://cloud.google.com/compute/docs/disks/detach-reattach-boot-disk https://www.terraform.io/docs/providers/google/r/compute_attached_disk.html

• 0000

[Chupaka]

So, looks like we simply need boot parameter exposed for google_compute_attached_disk - it's in API but not in the resource.

[AarshDhokai]

b/262698959

[AarshDhokai]

• In this case, support asked for updating and detaching a boot drive in a VM using Terraform, as far as I can see.
• According to this document's instructions for Detaching and Reattaching Boot Disks, we can detach a disc using the API endpoint mentioned in this step
• The request is about to provide an identical resource to google_compute_attached_disk. So we can provide a resource called google_compute_detached_disk based on the endpoint for detached disk.
• However, capability of updating boot disk for an instance(i.e. update the boot disk for a VM in one step) is only enabled via GUI, we are unable to offer updating a boot disc in a VM