UseStateForUnknown for agent policy ids (#885)

* UseStateForUnknown for agent policy ids

* Changelog

Author: tobio

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Support multiple group by fields in SLOs ([#870](https://github.com/elastic/terraform-provider-elasticstack/pull/878))
 - Use the auto-generated OAS schema from elastic/kibana for the Fleet API. ([#834](https://github.com/elastic/terraform-provider-elasticstack/issues/834))
 - Support description in `elasticstack_elasticsearch_security_role` data sources. ([#884](https://github.com/elastic/terraform-provider-elasticstack/pull/884))
+- Prevent spurious recreation of `elasticstack_fleet_agent_policy` resources due to 'changing' policy ids ([#885](https://github.com/elastic/terraform-provider-elasticstack/pull/885))
 
 ## [0.11.11] - 2024-10-25
 

internal/fleet/agent_policy/resource_test.go

@@ -2,6 +2,7 @@ package agent_policy_test
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"testing"
 
@@ -62,6 +63,7 @@ func TestAccResourceAgentPolicyFromSDK(t *testing.T) {
 
 func TestAccResourceAgentPolicy(t *testing.T) {
 	policyName := sdkacctest.RandStringFromCharSet(22, sdkacctest.CharSetAlphaNum)
+	var originalPolicyId string
 
 	resource.Test(t, resource.TestCase{
 		PreCheck:                 func() { acctest.PreCheck(t) },
@@ -78,6 +80,15 @@ func TestAccResourceAgentPolicy(t *testing.T) {
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "monitor_logs", "true"),
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "monitor_metrics", "false"),
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "skip_destroy", "false"),
+					resource.TestCheckResourceAttrWith("elasticstack_fleet_agent_policy.test_policy", "policy_id", func(value string) error {
+						originalPolicyId = value
+
+						if len(value) == 0 {
+							return errors.New("expected policy_id to be non empty")
+						}
+
+						return nil
+					}),
 				),
 			},
 			{
@@ -90,6 +101,13 @@ func TestAccResourceAgentPolicy(t *testing.T) {
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "monitor_logs", "false"),
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "monitor_metrics", "true"),
 					resource.TestCheckResourceAttr("elasticstack_fleet_agent_policy.test_policy", "skip_destroy", "false"),
+					resource.TestCheckResourceAttrWith("elasticstack_fleet_agent_policy.test_policy", "policy_id", func(value string) error {
+						if value != originalPolicyId {
+							return fmt.Errorf("expected policy_id to not change between test steps. Was [%s], now [%s]", originalPolicyId, value)
+						}
+
+						return nil
+					}),
 				),
 			},
 			{

internal/fleet/agent_policy/schema.go

@@ -17,12 +17,16 @@ func (r *agentPolicyResource) Schema(ctx context.Context, req resource.SchemaReq
 		"id": schema.StringAttribute{
 			Description: "The ID of this resource.",
 			Computed:    true,
+			PlanModifiers: []planmodifier.String{
+				stringplanmodifier.UseStateForUnknown(),
+			},
 		},
 		"policy_id": schema.StringAttribute{
 			Description: "Unique identifier of the agent policy.",
 			Computed:    true,
 			Optional:    true,
 			PlanModifiers: []planmodifier.String{
+				stringplanmodifier.UseStateForUnknown(),
 				stringplanmodifier.RequiresReplace(),
 			},
 		},