google_compute_instance > boot_disk > auto_delete update should not force replacement

[mrzor]

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Terraform Version

Terraform v0.12.29
+ provider.google v3.30.0
+ provider.google-beta v3.30.0

Affected Resource(s)

• google_compute_instance

Terraform Configuration Files

resource "google_compute_instance" "main" {
  project             = google_project.main.project_id
  name                = local.xxx_instance_name
  machine_type        = var.xxx_instance_machine_type
  zone                = var.xxx_instance_zone
  deletion_protection = true

  boot_disk {
    source      = google_compute_disk.main_instance_boot_drive.name
    auto_delete = false
  }

  network_interface {
    # snip
  }

  service_account {
    # snip
  }

  scheduling {
    # snip
  }

  guest_accelerator {
    # snip
  }

  # snip depends_on = [ ... ]
}

Expected Behavior

      ~ boot_disk {
          ~ auto_delete                = true -> false

Actual Behavior

      ~ boot_disk {
          ~ auto_delete                = true -> false # forces replacement

Steps to Reproduce

1. Import an instance
2. Change the auto_delete value of its boot disk
3. terraform apply or terraform plan : notice overeager attempt to recreate instance

References

• SDK gcloud compute instances set-disk-auto-delete
• rest/v1/instances/setDiskAutoDelete

b/374162426

[rileykarson]

This probably makes sense to fix as part of #6857

[rwblokzijl]

Is there an update on this? Not being able to change this is a killer if you want to redeploy the machine without wiping the boot-disk.

[fuog]

also had problems while moving from standard VM to Spot VM .. spot-VMs forces you to recreate the vm. This is how I first noticed the problem. all our VMs had this feature turned on by default.

[philip-harvey]

Any chance to get this assigned?

[karolgorc]

This seems like a copy of #14707

Will add it to related in PR