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Git SSH Checkout

A Buildkite plugin for arbitrary Git SSH checkout.

Note

This plugin utilises the buildkite-agent secret functionality for storing the SSH key that will be used for checking out the Git repository.

Usage

Tip

The primary use-case for this plugin is within an environment where the pipeline repository configuration cannot be completely utilised, such as using a non-Github repository when working with hosted agents. This plugin can be used within the base steps for a pipeline to allow for the initial repository clone and further pipelines to be loaded.

When a pipeline is created, the core focus is around the repository that will contain the context that builds happen within, especially things like further pipelines. Consider the following screenshot.

Creation of the Buildkite Pipeline

Here a new pipeline is being created, without using one of the provided integrations. This means we can use any URL we'd like, though we aren't able to provide authentication details. Before we run a build, we can apply the use of this plugin to allow for our authentication to be injected, specifically an SSH key.

First we need to add a secret that contains the key. In the Agents page, select the Cluster that pipeline will run within, and click Secrets in the left-hand menu. Add a New Secret with a specific name for the key, and then paste the key content (this will be the private key, including the starting and opening text). The following screenshot shows what this should look like in the UI.

Creation of the SSH Key Secret

We've now added the SUPER_SECRET_SSH_KEY secret to our cluster. Back in our pipeline settings, we can modify the Steps to make use of this with the plugin. Our code would look something like the following.

steps:
  - label: ":pipeline:"
    command: "buildkite-agent pipeline upload"
    plugins:
      - git-ssh-checkout#v0.4.1:
          ssh-secret-key-name: 'SUPER_SECRET_SSH_KEY'

The plugin will now replace the checkout functionality, and take the key from SUPER_SECRET_SSH_KEY and use it to authenticate for the git clone.

Uploaded steps

Important

Each step that works with the repository will need to include this plugin, as each time there's a checkout it needs to be replaced. This will mean copy-pasting the yaml each time. To lower the number of duplicated code lines, we can use yaml anchors to have yaml do the duplication for us.

Within a pipeline, we may then have some yaml like the following.

steps:
  - label: ":hammer_and_pick: Run linter"
    command: "make lint"
    plugins: &base-plugins
      - git-ssh-checkout#v0.4.1: &checkout-plugin
          ssh-secret-key-name: 'SUPER_SECRET_SSH_KEY'

  - label: ":hammer_and_pick: Run tests"
    command: "make tests"
    plugins: *base-plugins

  - label: ":docker: Build image"
    command: "make build-image"
    plugins:
      - git-ssh-checkout#v0.4.1: *checkout-plugin
      - ecr#v2.9.0:
          login: true

Here we define the anchors in the first step, use the full list in the second, then in the third take the small anchor as we want to add more plugins to the list.

Options

Optional

repository-url (string)

The full URL for referencing the repository. This is typically in the form of git@{hostname}:{organisation}/{repository}.git.

By default, the value for this will be the value of the BUILDKITE_REPO environment variable.

ssh-secret-key-name (string)

The name of the secrets key that contains the SSH key for interacting with the Git repository.

By default, the key name is GIT_SSH_CHECKOUT_PLUGIN_SSH_KEY.

checkout-path (string)

Replace the path the repository will be checked out to.

By default, the path will be the value of BUILDKITE_BUILD_CHECKOUT_PATH, the base path for the current build.

Examples

Making use of the default values:

steps:
  - label: "🔨 Running build"
    command: "echo Build happens here 💪"
    plugins:
      - git-ssh-checkout#v1.0.0:

Overriding specific attributes

Specifying options that differ from the defaults:

steps:
  - label: "🔨 Running build"
    command: "echo Build happens here 💪"
    plugins:
      - git-ssh-checkout#v1.0.0:
          repository-url: "git@example.com:org/repo.git"
          ssh-secret-key-name: "SUPER_SECRET_KEY"

Using multiple repositories and keys

steps:
  - label: "🔨 Running build A"
    command: "echo Build happening 🅰"
    plugins:
      - git-ssh-checkout#v1.0.0:
          repository-url: "git@example.com:org/repo-a.git"
          ssh-secret-key-name: "REPO_A_SECRET_KEY"
  - label: "🔨 Running build B"
    command: "echo Build happening 🅱"
    plugins:
      - git-ssh-checkout#v1.0.0:
          repository-url: "git@example.com:org/repo-b.git"
          ssh-secret-key-name: "REPO_B_SECRET_KEY"

⚒ Developing

You can use the bk cli to run the pipeline locally:

bk local run

👩‍💻 Contributing

  1. Fork the repo.
  2. Make the changes.
  3. Run the tests.
  4. Commit and push your changes.
  5. Send a pull request.

📜 License

MIT (see LICENSE).