Adding retry functionality to role assignment (#1647)

* Adding retry functionality to role assignment

* Fixing formatting issue

* bumping the timeout to 5m

azurerm/resource_arm_role_assignment.go

@@ -4,9 +4,11 @@ import (
 	"fmt"
 	"log"
 	"strings"
+	"time"
 
 	"github.com/Azure/azure-sdk-for-go/services/preview/authorization/mgmt/2018-01-01-preview/authorization"
 	"github.com/hashicorp/go-uuid"
+	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/hashicorp/terraform/helper/schema"
 	"github.com/terraform-providers/terraform-provider-azurerm/azurerm/utils"
 )
@@ -105,7 +107,7 @@ func resourceArmRoleAssignmentCreate(d *schema.ResourceData, meta interface{}) e
 		},
 	}
 
-	_, err := roleAssignmentsClient.Create(ctx, scope, name, properties)
+	err := resource.Retry(300*time.Second, retryRoleAssignmentsClient(scope, name, properties, meta))
 	if err != nil {
 		return err
 	}
@@ -176,3 +178,19 @@ func validateRoleDefinitionName(i interface{}, k string) ([]string, []error) {
 	}
 	return nil, nil
 }
+
+func retryRoleAssignmentsClient(scope string, name string, properties authorization.RoleAssignmentCreateParameters, meta interface{}) func() *resource.RetryError {
+
+	return func() *resource.RetryError {
+		roleAssignmentsClient := meta.(*ArmClient).roleAssignmentsClient
+		ctx := meta.(*ArmClient).StopContext
+
+		_, err := roleAssignmentsClient.Create(ctx, scope, name, properties)
+
+		if err != nil {
+			return resource.RetryableError(err)
+		}
+		return nil
+
+	}
+}