fix: Remove EC2-classic deprecation warnings by hardcoding classiclink values to `null` (#826)

README.md

@@ -346,7 +346,7 @@ No modules.
 | <a name="input_default_security_group_ingress"></a> [default\_security\_group\_ingress](#input\_default\_security\_group\_ingress) | List of maps of ingress rules to set on the default security group | `list(map(string))` | `[]` | no |
 | <a name="input_default_security_group_name"></a> [default\_security\_group\_name](#input\_default\_security\_group\_name) | Name to be used on the default security group | `string` | `null` | no |
 | <a name="input_default_security_group_tags"></a> [default\_security\_group\_tags](#input\_default\_security\_group\_tags) | Additional tags for the default security group | `map(string)` | `{}` | no |
-| <a name="input_default_vpc_enable_classiclink"></a> [default\_vpc\_enable\_classiclink](#input\_default\_vpc\_enable\_classiclink) | Should be true to enable ClassicLink in the Default VPC | `bool` | `false` | no |
+| <a name="input_default_vpc_enable_classiclink"></a> [default\_vpc\_enable\_classiclink](#input\_default\_vpc\_enable\_classiclink) | [DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink in the Default VPC | `bool` | `false` | no |
 | <a name="input_default_vpc_enable_dns_hostnames"></a> [default\_vpc\_enable\_dns\_hostnames](#input\_default\_vpc\_enable\_dns\_hostnames) | Should be true to enable DNS hostnames in the Default VPC | `bool` | `false` | no |
 | <a name="input_default_vpc_enable_dns_support"></a> [default\_vpc\_enable\_dns\_support](#input\_default\_vpc\_enable\_dns\_support) | Should be true to enable DNS support in the Default VPC | `bool` | `true` | no |
 | <a name="input_default_vpc_name"></a> [default\_vpc\_name](#input\_default\_vpc\_name) | Name to be used on the Default VPC | `string` | `null` | no |
@@ -369,8 +369,8 @@ No modules.
 | <a name="input_elasticache_subnet_suffix"></a> [elasticache\_subnet\_suffix](#input\_elasticache\_subnet\_suffix) | Suffix to append to elasticache subnets name | `string` | `"elasticache"` | no |
 | <a name="input_elasticache_subnet_tags"></a> [elasticache\_subnet\_tags](#input\_elasticache\_subnet\_tags) | Additional tags for the elasticache subnets | `map(string)` | `{}` | no |
 | <a name="input_elasticache_subnets"></a> [elasticache\_subnets](#input\_elasticache\_subnets) | A list of elasticache subnets | `list(string)` | `[]` | no |
-| <a name="input_enable_classiclink"></a> [enable\_classiclink](#input\_enable\_classiclink) | Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic. | `bool` | `null` | no |
-| <a name="input_enable_classiclink_dns_support"></a> [enable\_classiclink\_dns\_support](#input\_enable\_classiclink\_dns\_support) | Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic. | `bool` | `null` | no |
+| <a name="input_enable_classiclink"></a> [enable\_classiclink](#input\_enable\_classiclink) | [DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic. | `bool` | `null` | no |
+| <a name="input_enable_classiclink_dns_support"></a> [enable\_classiclink\_dns\_support](#input\_enable\_classiclink\_dns\_support) | [DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic. | `bool` | `null` | no |
 | <a name="input_enable_dhcp_options"></a> [enable\_dhcp\_options](#input\_enable\_dhcp\_options) | Should be true if you want to specify a DHCP options set with a custom domain name, DNS servers, NTP servers, netbios servers, and/or netbios server type | `bool` | `false` | no |
 | <a name="input_enable_dns_hostnames"></a> [enable\_dns\_hostnames](#input\_enable\_dns\_hostnames) | Should be true to enable DNS hostnames in the VPC | `bool` | `false` | no |
 | <a name="input_enable_dns_support"></a> [enable\_dns\_support](#input\_enable\_dns\_support) | Should be true to enable DNS support in the VPC | `bool` | `true` | no |

examples/complete-vpc/main.tf

@@ -20,15 +20,15 @@ module "vpc" {
   source = "../../"
 
   name = local.name
-  cidr = "20.10.0.0/16" # 10.0.0.0/8 is reserved for EC2-Classic
+  cidr = "10.0.0.0/16"
 
   azs                 = ["${local.region}a", "${local.region}b", "${local.region}c"]
-  private_subnets     = ["20.10.1.0/24", "20.10.2.0/24", "20.10.3.0/24"]
-  public_subnets      = ["20.10.11.0/24", "20.10.12.0/24", "20.10.13.0/24"]
-  database_subnets    = ["20.10.21.0/24", "20.10.22.0/24", "20.10.23.0/24"]
-  elasticache_subnets = ["20.10.31.0/24", "20.10.32.0/24", "20.10.33.0/24"]
-  redshift_subnets    = ["20.10.41.0/24", "20.10.42.0/24", "20.10.43.0/24"]
-  intra_subnets       = ["20.10.51.0/24", "20.10.52.0/24", "20.10.53.0/24"]
+  private_subnets     = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
+  public_subnets      = ["10.0.11.0/24", "10.0.12.0/24", "10.0.13.0/24"]
+  database_subnets    = ["10.0.21.0/24", "10.0.22.0/24", "10.0.23.0/24"]
+  elasticache_subnets = ["10.0.31.0/24", "10.0.32.0/24", "10.0.33.0/24"]
+  redshift_subnets    = ["10.0.41.0/24", "10.0.42.0/24", "10.0.43.0/24"]
+  intra_subnets       = ["10.0.51.0/24", "10.0.52.0/24", "10.0.53.0/24"]
 
   create_database_subnet_group = false
 
@@ -44,9 +44,6 @@ module "vpc" {
   enable_dns_hostnames = true
   enable_dns_support   = true
 
-  enable_classiclink             = true
-  enable_classiclink_dns_support = true
-
   enable_nat_gateway = true
   single_nat_gateway = true
 

main.tf

@@ -24,8 +24,8 @@ resource "aws_vpc" "this" {
   instance_tenancy                 = var.instance_tenancy
   enable_dns_hostnames             = var.enable_dns_hostnames
   enable_dns_support               = var.enable_dns_support
-  enable_classiclink               = var.enable_classiclink
-  enable_classiclink_dns_support   = var.enable_classiclink_dns_support
+  enable_classiclink               = null # https://github.com/hashicorp/terraform/issues/31730
+  enable_classiclink_dns_support   = null # https://github.com/hashicorp/terraform/issues/31730
   assign_generated_ipv6_cidr_block = var.enable_ipv6
 
   tags = merge(
@@ -1234,7 +1234,7 @@ resource "aws_default_vpc" "this" {
 
   enable_dns_support   = var.default_vpc_enable_dns_support
   enable_dns_hostnames = var.default_vpc_enable_dns_hostnames
-  enable_classiclink   = var.default_vpc_enable_classiclink
+  enable_classiclink   = null # https://github.com/hashicorp/terraform/issues/31730
 
   tags = merge(
     { "Name" = coalesce(var.default_vpc_name, "default") },

variables.tf

@@ -280,14 +280,16 @@ variable "enable_dns_support" {
   default     = true
 }
 
+# tflint-ignore: terraform_unused_declarations
 variable "enable_classiclink" {
-  description = "Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic."
+  description = "[DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic."
   type        = bool
   default     = null
 }
 
+# tflint-ignore: terraform_unused_declarations
 variable "enable_classiclink_dns_support" {
-  description = "Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic."
+  description = "[DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic."
   type        = bool
   default     = null
 }
@@ -694,8 +696,9 @@ variable "default_vpc_enable_dns_hostnames" {
   default     = false
 }
 
+# tflint-ignore: terraform_unused_declarations
 variable "default_vpc_enable_classiclink" {
-  description = "Should be true to enable ClassicLink in the Default VPC"
+  description = "[DEPRECATED](https://github.com/hashicorp/terraform/issues/31730) Should be true to enable ClassicLink in the Default VPC"
   type        = bool
   default     = false
 }