PR Commenter Plugin

A Buildkite plugin written in Go that enables commenting on pull requests that builds are triggered from.

The plugin uses the /issues endpoint as that doesn't require a commit SHA or file name in order to post the comment; this comment will post to the conversation tab and won't be associated with any file changes.

The plugin has been tested and built using go 1.20.3, so it is not guaranteed to work on versions <1.20.3.

The plugin binary will get built in the step and output as a pre-exit hook. This ensures that it runs as the last command on the step and is able to get the exit code of the step that it runs on (necessary for the default message).

The use of this plugin requires that clusters are being used and that the secret is available on that cluster, else the plugin will error.

👩‍💻 Usage

The plugin expects at least one of BUILDKITE_STEP_KEY or BUILDKITE_LABEL to be set for proper usage.

Add the following to your pipeline.yml:

    steps:
        key: approval-comment
        command: echo "~~~ :github: Add approval comment Pull Request"
        plugins:
            - pr-commenter#v0.3.0:
                message: "LGTM!"
                secret-name: GITHUB_TOKEN

Enabling "Sticky" comments

Set allow-repeats: false in order to post and update a single comment. This configuration relies on BUILDKITE_STEP_KEY or BUILDKITE_LABEL being set and unique to the step.

    steps:
        key: approval-comment
        command: echo "~~~ :github: Add approval comment Pull Request"
        plugins:
            - pr-commenter#v0.3.0:
                message: "LGTM!"
                secret-name: GITHUB_TOKEN
                allow-repeats: false

📒 Options

secret-name (optional, string)

The environment variable that contains the value of the GitHub API token. If not set, the plugin will try to get the URL from the default configuration.

Default: GITHUB_TOKEN

message (optional, string)

The message which should be posted to the PR. This can be a dynamic value, such as $BUILDKITE_COMMAND

Default: [${BUILDKITE_BUILD_URL}#${BUILDKITE_JOB_ID}](${BUILDKITE_BUILD_URL}#${BUILDKITE_JOB_ID}) exited with code ${BUILDKITE_COMMAND_EXIT_STATUS}

allow-repeats (optional, boolean)

Whether to Allow identical comments to be posted every time the plugin is run. Disabling this (allow-repeats: false) will cause the plugin to post a single "sticky" comment, which will be updated on subsequent runs if the message changes.

Default: true

message-id (optional, string)

An additional unique identifier for the comment generated by the plugin instance; useful if using "sticky" comments (allow-repeats: false) and using the plugin multiple times in a single step.

Default: null

Compatibility

Elastic Stack	Agent Stack K8s	Hosted (Mac)	Hosted (Linux)	Notes
✅	⚠️	✅	✅	K8s: The go binary will need to be available on the agents

• ✅ Fully supported (all combinations of attributes have been tested to pass)
• ⚠️ Partially supported (some combinations cause errors/issues)

🛠️ Development

Running the tests

The tests are written using Go's built-in testing package.

Tests can be run using:

go test -v ./...

💪 Contributing

We welcome all contributions to improve this plugin! To contribute, please follow these guidelines:

• Fork the repository
• Make your changes and ensure that the tests pass.
• Write clear and concise commit messages.
• Submit a pull request.

By contributing, you agree to license your contributions under the LICENSE file of this repository.

License

MIT (see LICENSE)