NEW: delete-default-vpcs module

modules/networking/delete-default-vpcs/README.md

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+# In the root module, use these to call this module
+
+```
+data "aws_regions" "current" {}
+
+module delete-default-vpc {
+  source = "./module/delete-default-vpc"
+  for_each = data.aws_regions.current.names
+  region-name = each.value
+}
+```
+

modules/networking/delete-default-vpcs/exec.sh

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+#!/bin/bash
+
+region=$1
+  # get default vpc
+  vpc=$(aws ec2 --region ${region} \
+    describe-vpcs --filter Name=isDefault,Values=true \
+    | jq -r .Vpcs[0].VpcId)
+  if [ "${vpc}" = "null" ]; then
+    echo "No default vpc found"
+    continue
+  fi
+  echo "Found default vpc ${vpc}"
+
+  # get internet gateway
+  igw=$(aws ec2 --region ${region} \
+    describe-internet-gateways --filter Name=attachment.vpc-id,Values=${vpc} \
+    | jq -r .InternetGateways[0].InternetGatewayId)
+  if [ "${igw}" != "null" ]; then
+    echo "Detaching and deleting internet gateway ${igw}"
+    aws ec2 --region ${region} \
+      detach-internet-gateway --internet-gateway-id ${igw} --vpc-id ${vpc}
+    aws ec2 --region ${region} \
+      delete-internet-gateway --internet-gateway-id ${igw}
+  fi
+
+  # get subnets
+  subnets=$(aws ec2 --region ${region} \
+    describe-subnets --filters Name=vpc-id,Values=${vpc} \
+    | jq -r .Subnets[].SubnetId)
+  if [ "${subnets}" != "null" ]; then
+    for subnet in ${subnets}; do
+      echo "Deleting subnet ${subnet}"
+      aws ec2 --region ${region} \
+        delete-subnet --subnet-id ${subnet}
+    done
+  fi
+
+  # https://docs.aws.amazon.com/cli/latest/reference/ec2/delete-vpc.html
+  # - You can't delete the main route table
+  # - You can't delete the default network acl
+  # - You can't delete the default security group
+
+  # delete default vpc
+  echo "Deleting vpc ${vpc}"
+  aws ec2 --region ${region} \
+    delete-vpc --vpc-id ${vpc}
+

modules/networking/delete-default-vpcs/main.tf

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+resource "null_resource" "shell" {
+  provisioner "local-exec" {
+    command = "/bin/bash -c '${path.module}/exec.sh ${var.region-name}'"
+  }
+}

modules/networking/delete-default-vpcs/variables.tf

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+variable region-name {}