adds deletion_policy field generation to templates

mmv1/api/resource.go

@@ -275,6 +275,14 @@ type Resource struct {
 	// public ca external account keys
 	ExcludeRead bool `yaml:"exclude_read,omitempty"`
 
+	// Set to true for resources that are to generate deletion policy fields by default
+	// TODO: this will be inverted to an opt-out flag very soon
+	DeletionPolicy bool `yaml:"deletion_policy,omitempty"`
+
+	// Set to the default deletion policy value for the resource.
+	// By default this will be "DELETE".
+	DeletionPolicyDefault string `yaml:"deletion_policy_default,omitempty"`
+
 	// Set to true for resources that wish to disable automatic generation of default provider
 	// value customdiff functions
 	// TODO rewrite: 1 instance used
@@ -488,6 +496,11 @@ func (r *Resource) setShallowDefaults() {
 	if r.Timeouts == nil {
 		r.Timeouts = NewTimeouts() // This only sets defaults if Timeouts is nil
 	}
+	if r.DeletionPolicy {
+		if r.DeletionPolicyDefault == "" {
+			r.DeletionPolicyDefault = "DELETE"
+		}
+	}
 }
 
 // SetDefault sets default values for this Resource and all its properties.

mmv1/templates/terraform/resource.go.tmpl

@@ -186,6 +186,20 @@ func Resource{{ $.ResourceName -}}() *schema.Resource {
                 Type:     schema.TypeString,
                 Computed: true,
             },
+{{- end}}
+{{- if $.DeletionPolicy }}
+            "deletion_policy": {
+                Type:     schema.TypeString,
+                Optional: true,
+                Description: `Whether Terraform will be prevented from destroying the instance. Defaults to "{{$.DeletionPolicyDefault}}".
+When a 'terraform destroy' or 'terraform apply' would delete the instance,
+the command will fail if this field is set to "PREVENT" in Terraform state.
+When set to "ABANDON", the command will remove the resource from Terraform
+management without updating or deleting the resource in the API.
+When set to "DELETE", deleting the resource is allowed.
+`,
+                Default: "{{$.DeletionPolicyDefault}}",
+            },
 {{- end}}
         },
         UseJSONNumber: true,
@@ -1125,6 +1139,15 @@ func resource{{ $.ResourceName }}Delete(d *schema.ResourceData, meta interface{}
     {{- if $.CustomCode.PreDelete }} 
         {{ customTemplate $ $.CustomCode.PreDelete false -}}
     {{- end }}
+    {{- if $.DeletionPolicy }}
+    if d.Get("deletion_policy").(string) == "PREVENT" {
+        return fmt.Errorf("cannot destroy {{$.ResourceName}} without setting deletion_policy=\"DELETE\" and running `terraform apply`")
+    }
+    if d.Get("deletion_policy").(string) == "ABANDON" {
+        log.Printf("[DEBUG] deletion_policy set to \"ABANDON\", removing {{ $.Name }} %q from Terraform state without deletion", d.Id())
+        return nil
+    }
+    {{- end }}
 
     log.Printf("[DEBUG] Deleting {{ $.Name }} %q", d.Id())
     res, err := transport_tpg.SendRequest(transport_tpg.SendRequestOptions{

mmv1/templates/terraform/resource.html.markdown.tmpl

@@ -125,6 +125,14 @@ The following arguments are supported:
     If it is not provided, the provider project is used.
 {{ "" }}
 {{- end }}
+{{- if $.DeletionPolicy }}
+* `deletion_policy` - (Optional) Whether Terraform will be prevented from destroying the resource. Defaults to {{$.DeletionPolicyDefault}}.
+	When a 'terraform destroy' or 'terraform apply' would delete the resource,
+	the command will fail if this field is set to "PREVENT" in Terraform state.
+	When set to "ABANDON", the command will remove the resource from Terraform
+	management without updating or deleting the resource in the API.
+	When set to "DELETE", deleting the resource is allowed.
+{{- end }}
 {{- range $f := $.VirtualFields }}
 * `{{$f.Name}}` - (Optional) {{$f.Description}}
 {{- end }}