Terraform Provider: ARM2TF

The arm2tf provider implements ARM template functions, allowing configurations written in ARM or Bicep to be reproduced in Terraform whilst preserving the results (e.g. resource names).

Currently, the implemented functions are:

• (Logical) Resource arm2tf_unique_string implements the ARM Template function UniqueString().

N.B. All resources marked (Logical) carry out their processing within the provider, they don't call any network resources such as the Azure Resource Manager APIs.

Documentation, questions and discussions

Official documentation on how to use this provider can be found on the Terraform Registry.

Requirements

• Terraform (>= 0.12)
• Go (1.18)
• GNU Make
• golangci-lint (optional)

Development

Building

1. git clone this repository and cd into its directory
2. make build will trigger the Golang build

The provided GNUmakefile defines additional commands generally useful during development, like for running tests, generating documentation, code formatting and linting. Taking a look at it's content is recommended.

Testing

In order to test the provider, you can run

• make test to run provider tests
• make testacc to run provider acceptance tests

It's important to note that acceptance tests (testacc) will actually spawn terraform and the provider. Read more about they work on the official page.

Generating documentation

This provider uses terraform-plugin-docs to generate documentation and store it in the docs/ directory. Once a release is cut, the Terraform Registry will download the documentation from docs/ and associate it with the release version. Read more about how this works on the official page.

Use make generate to ensure the documentation is regenerated with any changes.

Using a development build

If running tests and acceptance tests isn't enough, it's possible to set up a local terraform configuration to use a development builds of the provider. This can be achieved by leveraging the Terraform CLI configuration file development overrides.

First, use make install to place a fresh development build of the provider in your ${GOBIN} (defaults to ${GOPATH}/bin or ${HOME}/go/bin if ${GOPATH} is not set). Repeat this every time you make changes to the provider locally.

Then, in your ${HOME}/.terraformrc (Unix) / %APPDATA%\terraform.rc (Windows), a provider_installation that contains the following dev_overrides:

provider_installation {
  dev_overrides {
    "cloud-maker-ai/arm2tf" = "${GOBIN}" //< replace `${GOBIN}` with the actual path on your system
  }

  direct {}
}

Note that it's also possible to use a dedicated Terraform configuration file and invoke terraform while setting the environment variable TF_CLI_CONFIG_FILE=my_terraform_config_file.

Once the dev_overrides are in place, any local execution of terraform plan and terraform apply will use the version of the provider found in the given ${GOBIN} directory, instead of the one indicated in your terraform configuration.

Testing GitHub Actions

This project uses GitHub Actions to realize its CI.

Sometimes it might be helpful to locally reproduce the behaviour of those actions, and for this we use act. Once installed, you can simulate the actions executed when opening a PR with:

# List of workflows for the 'pull_request' action
$ act -l pull_request

# Execute the workflows associated with the `pull_request' action 
$ act pull_request

Releasing

The release process is automated via GitHub Actions, and it's defined in the Workflow release.yml.

Each release is cut by pushing a semantically versioned tag to the default branch.

License

Mozilla Public License v2.0