monorepo-diff-buildkite-plugin

This plugin will assist you in triggering pipelines by watching folders in your monorepo.

Check out this post to learn How to set up Continuous Integration for monorepo using Buildkite.

Example

Simple

steps:
  - label: "Triggering pipelines"
    plugins:
      - chronotc/monorepo-diff#v1.3.2:
          diff: "git diff --name-only HEAD~1"
          watch:
            - path: "bar-service/"
              config:
                command: "echo deploy-bar"
            - path: "foo-service/"
              config:
                trigger: "deploy-foo-service"

Detailed

steps:
  - label: "Triggering pipelines"
    plugins:
      - chronotc/monorepo-diff#v1.3.2:
          diff: "git diff --name-only $(head -n 1 last_successful_build)"
          interpolation: false
          watch:
            - path:
                - "ops/terraform/"
                - "ops/templates/terraform/"
              config:
                command: "buildkite-agent pipeline upload ops/.buildkite/pipeline.yml"
                label: "Upload pipeline"
                retry:
                  automatic:
                  - limit: 2
                    exit_status: -1
                agents:
                  queue: performance
                artifacts:
                  - "logs/*"
                env:
                  - FOO=bar
            - path: "foo-service/"
              config:
                trigger: "deploy-foo-service"
                label: "Triggered deploy"
                build:
                  message: "Deploying foo service"
                  env:
                    - HELLO=123
                    - AWS_REGION

          wait: true
          hooks:
            - command: "echo $(git rev-parse HEAD) > last_successful_build"

Configuration

diff (optional)

This will run the script provided to determine the folder changes. Depending on your use case, you may want to determine the point where the branch occurs https://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git and perform a diff against the branch point.

Sample output:

README.md
lib/trigger.bash
tests/trigger.bats

Default: git diff --name-only HEAD~1

Examples:

diff: ./diff-against-last-successful-build.sh

#!/bin/bash

set -ueo pipefail

LAST_SUCCESSFUL_BUILD_COMMIT="$(aws s3 cp "${S3_LAST_SUCCESSFUL_BUILD_COMMIT_PATH}" - | head -n 1)"
git diff --name-only "$LAST_SUCCESSFUL_BUILD_COMMIT"

diff: ./diff-against-last-built-tag.sh

#!/bin/bash

set -ueo pipefail

LATEST_BUILT_TAG=$(git describe --tags --match foo-service-* --abbrev=0)
git diff --name-only "$LATEST_TAG"

interpolation (optional)

This controls the pipeline interpolation on upload, and defaults to true. If set to false it adds --no-interpolation to the buildkite pipeline upload, to avoid trying to interpolate the commit message, which can cause failures.

watch

Declare a list of

- path: app/cms/
  config: # Required [trigger step configuration]
    trigger: cms-deploy # Required [trigger pipeline slug]
- path:
    - services/email
    - assets/images/email
  config:
    trigger: email-deploy

path

If the path specified here in the appears in the diff output, a trigger step will be added to the dynamically generated pipeline.yaml

A list of paths can be provided to trigger the desired pipeline. Changes in any of the paths will initiate the pipeline provided in trigger.

config

Configuration supports 2 different step types.

• Trigger
• Command

Trigger

The configuration for the trigger step https://buildkite.com/docs/pipelines/trigger-step

By default, it will pass the following values to the build attributes unless an alternative values are provided

- path: app/cms/
  config:
    trigger: cms-deploy
    build:
      commit: $BUILDKITE_COMMIT
      branch: $BUILDKITE_BRANCH

wait (optional)

Default: true

By setting wait to true, the build will wait until the triggered pipeline builds are successful before proceeding

hooks (optional)

Currently supports a list of commands you wish to execute after the watched pipelines have been triggered

hooks:
  - command: upload unit tests reports
  - command: echo success

Command

- path: app/cms/
  config:
    command: "netlify --production deploy"
    label: ":netlify: Deploy to production"
    agents:
      queue: "deploy"
    env:
      FOO: bar

There is currently limited support for command configuration. Only the command property can be provided at this point in time.

Using commands, it is also possible to use this to upload other pipeline definitions

- path: frontend/
  config:
    command: "buildkite-agent pipeline upload ./frontend/.buildkite/pipeline.yaml"
- path: infrastructure/
  config:
    command: "buildkite-agent pipeline upload ./infrastructure/.buildkite/pipeline.yaml"
- path: backend/
  config:
    command: "buildkite-agent pipeline upload ./backend/.buildkite/pipeline.yaml"

Environment

DEBUG (optional)

By turning DEBUG on, the generated pipeline will be displayed prior to upload

steps:
  - label: "Triggering pipelines"
    plugins:
      - chronotc/monorepo-diff:
          diff: "git diff --name-only HEAD~1"
          log_level: "debug" # defaults to "info"
          watch:
            - path: "foo-service/"
              config:
                trigger: "deploy-foo-service"

References

https://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git

Contribute

To run tests

Ensure that all tests are in the ./tests

docker-compose run --rm tests

To run lint

docker-compose run --rm lint

To run e2e tests

1. Install buildkite cli
2. Install buildkite agent

bk local run