feat: Use a map for root_block_device instead of list

README.md

@@ -244,7 +244,7 @@ No modules.
 | <a name="input_private_dns_name_options"></a> [private\_dns\_name\_options](#input\_private\_dns\_name\_options) | Customize the private DNS name options of the instance | `map(string)` | `{}` | no |
 | <a name="input_private_ip"></a> [private\_ip](#input\_private\_ip) | Private IP address to associate with the instance in a VPC | `string` | `null` | no |
 | <a name="input_putin_khuylo"></a> [putin\_khuylo](#input\_putin\_khuylo) | Do you agree that Putin doesn't respect Ukrainian sovereignty and territorial integrity? More info: https://en.wikipedia.org/wiki/Putin_khuylo! | `bool` | `true` | no |
-| <a name="input_root_block_device"></a> [root\_block\_device](#input\_root\_block\_device) | Customize details about the root block device of the instance. See [Block Devices](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance#ebs-ephemeral-and-root-block-devices) for details | `list(any)` | `[]` | no |
+| <a name="input_root_block_device"></a> [root\_block\_device](#input\_root\_block\_device) | Customize details about the root block device of the instance. See Block Devices below for details | `any` | `{}` | no |
 | <a name="input_secondary_private_ips"></a> [secondary\_private\_ips](#input\_secondary\_private\_ips) | A list of secondary private IPv4 addresses to assign to the instance's primary network interface (eth0) in a VPC. Can only be assigned to the primary network interface (eth0) attached at instance creation, not a pre-existing network interface i.e. referenced in a `network_interface block` | `list(string)` | `null` | no |
 | <a name="input_source_dest_check"></a> [source\_dest\_check](#input\_source\_dest\_check) | Controls if traffic is routed to the instance when the destination address does not match the instance. Used for NAT or VPNs | `bool` | `null` | no |
 | <a name="input_spot_block_duration_minutes"></a> [spot\_block\_duration\_minutes](#input\_spot\_block\_duration\_minutes) | The required duration for the Spot instances, in minutes. This value must be a multiple of 60 (60, 120, 180, 240, 300, or 360) | `number` | `null` | no |

examples/complete/main.tf

@@ -59,17 +59,15 @@ module "ec2_complete" {
     threads_per_core = 1
   }
   enable_volume_tags = false
-  root_block_device = [
-    {
-      encrypted   = true
-      volume_type = "gp3"
-      throughput  = 200
-      volume_size = 50
-      tags = {
-        Name = "my-root-block"
-      }
-    },
-  ]
+  root_block_device = {
+    encrypted   = true
+    volume_type = "gp3"
+    throughput  = 200
+    volume_size = 50
+    tags = {
+      Name = "my-root-block"
+    }
+  }
 
   ebs_block_device = [
     {
@@ -190,29 +188,25 @@ locals {
       instance_type     = "t3.micro"
       availability_zone = element(module.vpc.azs, 0)
       subnet_id         = element(module.vpc.private_subnets, 0)
-      root_block_device = [
-        {
-          encrypted   = true
-          volume_type = "gp3"
-          throughput  = 200
-          volume_size = 50
-          tags = {
-            Name = "my-root-block"
-          }
+      root_block_device = {
+        encrypted   = true
+        volume_type = "gp3"
+        throughput  = 200
+        volume_size = 50
+        tags = {
+          Name = "my-root-block"
         }
-      ]
+      }
     }
     two = {
       instance_type     = "t3.small"
       availability_zone = element(module.vpc.azs, 1)
       subnet_id         = element(module.vpc.private_subnets, 1)
-      root_block_device = [
-        {
-          encrypted   = true
-          volume_type = "gp2"
-          volume_size = 50
-        }
-      ]
+      root_block_device = {
+        encrypted   = true
+        volume_type = "gp2"
+        volume_size = 50
+      }
     }
     three = {
       instance_type     = "t3.medium"
@@ -270,17 +264,15 @@ module "ec2_spot_instance" {
   }
 
   enable_volume_tags = false
-  root_block_device = [
-    {
-      encrypted   = true
-      volume_type = "gp3"
-      throughput  = 200
-      volume_size = 50
-      tags = {
-        Name = "my-root-block"
-      }
-    },
-  ]
+  root_block_device = {
+    encrypted   = true
+    volume_type = "gp3"
+    throughput  = 200
+    volume_size = 50
+    tags = {
+      Name = "my-root-block"
+    }
+  }
 
   ebs_block_device = [
     {
@@ -389,17 +381,15 @@ module "ec2_cpu_options" {
     amd_sev_snp      = "enabled"
   }
   enable_volume_tags = false
-  root_block_device = [
-    {
-      encrypted   = true
-      volume_type = "gp3"
-      throughput  = 200
-      volume_size = 50
-      tags = {
-        Name = "my-root-block"
-      }
-    },
-  ]
+  root_block_device = {
+    encrypted   = true
+    volume_type = "gp3"
+    throughput  = 200
+    volume_size = 50
+    tags = {
+      Name = "my-root-block"
+    }
+  }
 
   ebs_block_device = [
     {

main.tf

@@ -76,7 +76,7 @@ resource "aws_instance" "this" {
   }
 
   dynamic "root_block_device" {
-    for_each = var.root_block_device
+    for_each = length(var.root_block_device) > 0 ? [var.root_block_device] : []
 
     content {
       delete_on_termination = try(root_block_device.value.delete_on_termination, null)
@@ -254,7 +254,7 @@ resource "aws_instance" "ignore_ami" {
   }
 
   dynamic "root_block_device" {
-    for_each = var.root_block_device
+    for_each = length(var.root_block_device) > 0 ? [var.root_block_device] : []
 
     content {
       delete_on_termination = try(root_block_device.value.delete_on_termination, null)
@@ -448,7 +448,7 @@ resource "aws_spot_instance_request" "this" {
   }
 
   dynamic "root_block_device" {
-    for_each = var.root_block_device
+    for_each = length(var.root_block_device) > 0 ? [var.root_block_device] : []
 
     content {
       delete_on_termination = try(root_block_device.value.delete_on_termination, null)

variables.tf

@@ -196,8 +196,8 @@ variable "private_ip" {
 
 variable "root_block_device" {
   description = "Customize details about the root block device of the instance. See Block Devices below for details"
-  type        = list(any)
-  default     = []
+  type        = any
+  default     = {}
 }
 
 variable "secondary_private_ips" {

wrappers/main.tf

@@ -57,7 +57,7 @@ module "wrapper" {
   private_dns_name_options            = try(each.value.private_dns_name_options, var.defaults.private_dns_name_options, {})
   private_ip                          = try(each.value.private_ip, var.defaults.private_ip, null)
   putin_khuylo                        = try(each.value.putin_khuylo, var.defaults.putin_khuylo, true)
-  root_block_device                   = try(each.value.root_block_device, var.defaults.root_block_device, [])
+  root_block_device                   = try(each.value.root_block_device, var.defaults.root_block_device, {})
   secondary_private_ips               = try(each.value.secondary_private_ips, var.defaults.secondary_private_ips, null)
   source_dest_check                   = try(each.value.source_dest_check, var.defaults.source_dest_check, null)
   spot_block_duration_minutes         = try(each.value.spot_block_duration_minutes, var.defaults.spot_block_duration_minutes, null)