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Writing Plugins

If you want to add custom rules, you can write ruleset plugins.

Overview

Plugins are independent binaries and use go-plugin to communicate with TFLint over gRPC. TFLint executes the binary when the plugin is enabled, and the plugin process must act as an gRPC server for TFLint.

If you want to create a new plugin, The template repository is available to satisfy these specification. You can create your own repository from "Use this template" and easily add rules based on some reference rules.

The template repository uses the SDK that wraps the go-plugin for communication with TFLint. See also the Architecture section for the architecture of the plugin system.

1. Creating a repository from the template

Visit tflint-ruleset-template and click the "Use this template" button. Repository name must be tflint-ruleset-*.

2. Building and installing the plugin

The created repository can be installed locally with make install. Enable the plugin as follows and verify that the installed plugin works.

plugin "template" {
    enabled = true
}
$ make install
go build
mkdir -p ~/.tflint.d/plugins
mv ./tflint-ruleset-template ~/.tflint.d/plugins
$ tflint -v
TFLint version 0.28.1
+ ruleset.template (0.1.0)

3. Changing/Adding the rules

Rename the ruleset and add/edit rules. After making changes, you can check the behavior with make install. See also the tflint-plugin-sdk API reference for communication with the host process.

4. Creating a GitHub Release

You can build and install your own ruleset locally as described above, but you can also install it automatically with tflint --init.

The requirements to support automatic installation are as follows:

  • The built plugin binaries must be published on GitHub Release
  • The release must be tagged with a name like v1.1.1
  • The release must contain an asset with a name like tflint-ruleset-{name}_{GOOS}_{GOARCH}.zip
  • The zip file must contain a binary named tflint-ruleset-{name} (tflint-ruleset-{name}.exe in Windows)
  • The release must contain a checksum file for the zip file with the name checksums.txt
  • The checksum file must contain a sha256 hash and filename

When signing a release, the release must additionally meet the following requirements:

  • The release must contain a signature file for the checksum file with the name checksums.txt.sig
  • The signature file must be binary OpenPGP format

Releases that meet these requirements can be easily created by following the GoReleaser config in the template repository.