Add replacement_method to IGM and RIGM update_policy

.changelog/4258.txt

@@ -0,0 +1,6 @@
+```release-note:enhancement
+compute: added `replacement_method` field to `update_policy` block of `google_compute_instance_group_manager`
+```
+```release-note:enhancement
+compute: added `replacement_method` field to `update_policy` block of `google_compute_region_instance_group_manager`
+```

google-beta/resource_compute_instance_group_manager.go

@@ -252,6 +252,13 @@ func resourceComputeInstanceGroupManager() *schema.Resource {
 							ValidateFunc: validation.IntBetween(0, 3600),
 							Description:  `Minimum number of seconds to wait for after a newly created instance becomes available. This value must be from range [0, 3600].`,
 						},
+						"replacement_method": {
+							Type:             schema.TypeString,
+							Optional:         true,
+							ValidateFunc:     validation.StringInSlice([]string{"RECREATE", "SUBSTITUTE", ""}, false),
+							DiffSuppressFunc: emptyOrDefaultStringSuppress("SUBSTITUTE"),
+							Description:      `The instance replacement method for managed instance groups. Valid values are: "RECREATE", "SUBSTITUTE". If SUBSTITUTE (default), the group replaces VM instances with new instances that have randomly generated names. If RECREATE, instance names are preserved.  You must also set max_unavailable_fixed or max_unavailable_percent to be greater than 0.`,
+						},
 					},
 				},
 			},
@@ -800,6 +807,7 @@ func expandUpdatePolicy(configured []interface{}) *computeBeta.InstanceGroupMana
 
 		updatePolicy.MinimalAction = data["minimal_action"].(string)
 		updatePolicy.Type = data["type"].(string)
+		updatePolicy.ReplacementMethod = data["replacement_method"].(string)
 
 		// percent and fixed values are conflicting
 		// when the percent values are set, the fixed values will be ignored
@@ -888,6 +896,7 @@ func flattenUpdatePolicy(updatePolicy *computeBeta.InstanceGroupManagerUpdatePol
 		up["min_ready_sec"] = updatePolicy.MinReadySec
 		up["minimal_action"] = updatePolicy.MinimalAction
 		up["type"] = updatePolicy.Type
+		up["replacement_method"] = updatePolicy.ReplacementMethod
 		results = append(results, up)
 	}
 	return results

google-beta/resource_compute_instance_group_manager_test.go

@@ -241,6 +241,14 @@ func TestAccInstanceGroupManager_updatePolicy(t *testing.T) {
 				ImportState:       true,
 				ImportStateVerify: true,
 			},
+			{
+				Config: testAccInstanceGroupManager_rollingUpdatePolicy5(igm),
+			},
+			{
+				ResourceName:      "google_compute_instance_group_manager.igm-rolling-update-policy",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
 		},
 	})
 }
@@ -980,6 +988,56 @@ resource "google_compute_instance_group_manager" "igm-rolling-update-policy" {
 `, igm)
 }
 
+func testAccInstanceGroupManager_rollingUpdatePolicy5(igm string) string {
+	return fmt.Sprintf(`
+data "google_compute_image" "my_image" {
+  family  = "debian-9"
+  project = "debian-cloud"
+}
+
+resource "google_compute_instance_template" "igm-rolling-update-policy" {
+  machine_type   = "e2-medium"
+  can_ip_forward = false
+  tags           = ["terraform-testing"]
+  disk {
+    source_image = data.google_compute_image.my_image.self_link
+    auto_delete  = true
+    boot         = true
+  }
+  network_interface {
+    network = "default"
+  }
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "google_compute_instance_group_manager" "igm-rolling-update-policy" {
+  description = "Terraform test instance group manager"
+  name        = "%s"
+  version {
+    name              = "prod2"
+    instance_template = google_compute_instance_template.igm-rolling-update-policy.self_link
+  }
+  base_instance_name = "igm-rolling-update-policy"
+  zone               = "us-central1-c"
+  target_size        = 3
+  update_policy {
+    type                  = "PROACTIVE"
+    minimal_action        = "REPLACE"
+    max_surge_fixed       = 0
+    max_unavailable_fixed = 2
+    min_ready_sec         = 20
+    replacement_method    = "RECREATE"
+  }
+  named_port {
+    name = "customhttp"
+    port = 8080
+  }
+}
+`, igm)
+}
+
 func testAccInstanceGroupManager_separateRegions(igm1, igm2 string) string {
 	return fmt.Sprintf(`
 data "google_compute_image" "my_image" {

google-beta/resource_compute_region_instance_group_manager.go

@@ -279,6 +279,13 @@ func resourceComputeRegionInstanceGroupManager() *schema.Resource {
 							DiffSuppressFunc: emptyOrDefaultStringSuppress("PROACTIVE"),
 							Description:      `The instance redistribution policy for regional managed instance groups. Valid values are: "PROACTIVE", "NONE". If PROACTIVE (default), the group attempts to maintain an even distribution of VM instances across zones in the region. If NONE, proactive redistribution is disabled.`,
 						},
+						"replacement_method": {
+							Type:             schema.TypeString,
+							Optional:         true,
+							ValidateFunc:     validation.StringInSlice([]string{"RECREATE", "SUBSTITUTE", ""}, false),
+							DiffSuppressFunc: emptyOrDefaultStringSuppress("SUBSTITUTE"),
+							Description:      `The instance replacement method for regional managed instance groups. Valid values are: "RECREATE", "SUBSTITUTE". If SUBSTITUTE (default), the group replaces VM instances with new instances that have randomly generated names. If RECREATE, instance names are preserved.  You must also set max_unavailable_fixed or max_unavailable_percent to be greater than 0.`,
+						},
 					},
 				},
 			},
@@ -639,6 +646,7 @@ func expandRegionUpdatePolicy(configured []interface{}) *computeBeta.InstanceGro
 		updatePolicy.MinimalAction = data["minimal_action"].(string)
 		updatePolicy.Type = data["type"].(string)
 		updatePolicy.InstanceRedistributionType = data["instance_redistribution_type"].(string)
+		updatePolicy.ReplacementMethod = data["replacement_method"].(string)
 
 		// percent and fixed values are conflicting
 		// when the percent values are set, the fixed values will be ignored
@@ -699,6 +707,7 @@ func flattenRegionUpdatePolicy(updatePolicy *computeBeta.InstanceGroupManagerUpd
 		up["minimal_action"] = updatePolicy.MinimalAction
 		up["type"] = updatePolicy.Type
 		up["instance_redistribution_type"] = updatePolicy.InstanceRedistributionType
+		up["replacement_method"] = updatePolicy.ReplacementMethod
 
 		results = append(results, up)
 	}

google-beta/resource_compute_region_instance_group_manager_test.go

@@ -228,6 +228,14 @@ func TestAccRegionInstanceGroupManager_rollingUpdatePolicy(t *testing.T) {
 				ImportState:       true,
 				ImportStateVerify: true,
 			},
+			{
+				Config: testAccRegionInstanceGroupManager_rollingUpdatePolicy3(igm),
+			},
+			{
+				ResourceName:      "google_compute_region_instance_group_manager.igm-rolling-update-policy",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
 		},
 	})
 }
@@ -1231,6 +1239,61 @@ resource "google_compute_region_instance_group_manager" "igm-rolling-update-poli
 `, igm)
 }
 
+func testAccRegionInstanceGroupManager_rollingUpdatePolicy3(igm string) string {
+	return fmt.Sprintf(`
+data "google_compute_image" "my_image" {
+  family  = "debian-9"
+  project = "debian-cloud"
+}
+
+resource "google_compute_instance_template" "igm-rolling-update-policy" {
+  machine_type   = "e2-medium"
+  can_ip_forward = false
+  tags           = ["terraform-testing"]
+
+  disk {
+    source_image = data.google_compute_image.my_image.self_link
+    auto_delete  = true
+    boot         = true
+  }
+
+  network_interface {
+    network = "default"
+  }
+
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "google_compute_region_instance_group_manager" "igm-rolling-update-policy" {
+  description = "Terraform test instance group manager"
+  name        = "%s"
+  version {
+    name              = "primary"
+    instance_template = google_compute_instance_template.igm-rolling-update-policy.self_link
+  }
+  base_instance_name        = "igm-rolling-update-policy"
+  region                    = "us-central1"
+  distribution_policy_zones = ["us-central1-a", "us-central1-f"]
+  target_size               = 3
+  update_policy {
+    type                         = "PROACTIVE"
+    instance_redistribution_type = "NONE"
+    minimal_action               = "REPLACE"
+    max_surge_fixed              = 0
+    max_unavailable_fixed        = 2
+    min_ready_sec                = 10
+    replacement_method           = "RECREATE"
+  }
+  named_port {
+    name = "customhttp"
+    port = 8080
+  }
+}
+`, igm)
+}
+
 func testAccRegionInstanceGroupManager_stateful(template, igm string) string {
 	return fmt.Sprintf(`
 data "google_compute_image" "my_image" {