AWS CloudFormation Resource Schema Downloader

Download and verify AWS CloudFormation resource schemas.

This tool

• Reads an HCL configuration file listing the CloudFormation resource type schemas included in the provider
• Checks whether a local copy of each configured schema is available and if not, downloads the schema from the CloudFormation registry and stores it locally
• Verifies that each schema conforms to the correct meta-schema
• Generates a Go source file that contains instructions for go generate to drive the Terraform Resource Schema Generator

Run go run internal/provider/generators/schema/main.go --help to see all options.

Note that valid AWS credentials must be available via standard mechanisms to download a resource type schema from the CloudFormation registry.

Configuration File

The -config command-line argument specifies a configuration file. The file contains 3 types of block.

defaults Block

The defaults block specifies defaults which can be overriden by each resource schema. Each configuration file must contain a single defaults block.

defaults {
  # Schema cache directory. Required.
  schema_cache_directory = "../service/cloudformation/schemas"

  # Prefix for Terraform type names. Optional.
  # The default is to use the label from the resource_schema block as the type name.
  terraform_type_name_prefix = "awscc"
}

meta_schema Block

The meta_schema block specifies the details of the CloudFormation resource meta-schema. Each configuration file must contain a single meta_schema block.

meta_schema {
  # Path to the meta-schema file. Required.
  path = "../service/cloudformation/meta-schemas/provider.definition.schema.v1.json"
}

resource_schema Block

Each resource_schema block specifies the details of a single CloudFormation resource schema. Each configuration file contains zero or more resource_schema blocks.

resource_schema "aws_ec2_instance" {
  # CloudFormation type name. Required.
  cloudformation_type_name = "AWS::EC2::Instance"

  # Path to the CloudFormation schema file.
  # Optional.
  # The default value combines the `defaults.schema_cache_directory` value with the CloudFormation type name.
  cloudformation_schema_path = "../service/cloudformation/schemas/ec2-instance.json"

  # Whether or not to suppress Terraform resource generation.
  # Optional.
  # The default value is false - A Terraform resource is generated.
  suppress_resource_generation = true

  # Whether or not to suppress Terraform singular data source generation.
  # Optional.
  # The default value is false - A Terraform singular data source is generated.
  suppress_singular_data_source_generation = true

  # Whether or not to suppress Terraform plural data source generation.
  # Optional.
  # The default value is false - A Terraform plural data source is generated.
  suppress_plural_data_source_generation = true
}