Lighthouse is a lightweight ChatOps based webhook handler which can trigger Jenkins X Pipelines on webhooks from multiple git providers such as: GitHub, GitHub Enterprise, GitLab, and BitBucket Server. It is a successor to Prow, providing support for more SCM providers, a smaller footprint, and an easier path to adding features going forward. Lighthouse has been the default webhook handler in Jenkins X since early May, 2020.
Currently Lighthouse is focused on using Jenkins X Pipelines with tekton.
Currently Lighthouse supports the common prow plugins and handles push webhooks to branches & Pull Request webhooks to then trigger Jenkins X pipelines.
Lighthouse uses the same
plugins.yaml file structure from Prow so that we can easily migrate from
prow <-> lighthouse.
This also means we get to reuse the clean generation of Prow configuration from the
Scheduler CRDs integrated into jx boot. e.g. here’s the default scheduler configuration which is used for any project imported into your Jenkins X cluster; without you having to touch the actual prow configuration files. You can create many schedulers and associate them to different
We can also reuse Prow’s capability of defining many separate pipelines on a repository (for PRs or releases) via having separate
contexts. Then on a Pull Request we can use
/test something or
/test all to trigger pipelines and use the
Using Lighthouse with boot
Once you have modified your
jx-requirements.yml file you just need to run
If you are using something else other than github.com as your git provider you will also require some extra YAML to configure the git provider. Here are some examples:
cluster: provider: gke zone: europe-west1-c environmentGitOwner: myowner gitKind: github gitName: ghe gitServer: https://my-github.com webhook: lighthouse
cluster: provider: gke environmentGitOwner: myowner gitKind: bitbucketserver gitName: bs gitServer: https://my-bitbucket-server.com webhook: lighthouse
cluster: provider: gke environmentGitOwner: myowner gitKind: gitlab gitName: gitlab gitServer: https://my-gitlab-server.com webhook: lighthouse
Comparisons to Prow
Lighthouse is based on a fork of Prow’s source code, including most of the built-in plugins from prow
The most noteworthy differences are:
- In order to support multiple SCM providers, Lighthouse uses jenkins-x/go-scm as an abstraction layer, allowing additional provider support to be implemented without needing significant changes within Lighthouse itself.
- Lighthouse has less moving parts and potential configuration than Prow, resulting in only four pods being run for Lighthouse: two webhook receiver replicas, a Keeper pod, which handles deciding when to merge and actually merging pull requests, and a Foghorn pod, which handles reporting commit statuses back to the provider.
Porting Prow commands
If there are any Prow commands you want which we’ve not yet ported over, it’s relatively easy to port Prow plugins.
We’ve reused the Prow plugin code and configuration code as the basis for Lighthouse; so its mostly a case of switching imports of
github.com/jenkins-x/lighthouse - then modifying the github client structs from, say,
Most of the GitHub structs map 1-1 with the jenkins-x/go-scm equivalents (e.g. Issue, Commit, PullRequest) though the go-scm API does tend to return slices to pointers to resources by default. There are some naming differences at different parts of the API though.
All the Prow-descended plugin related code lives in the pkg/plugins tree of packages. Mostly all we’ve done is switch to using jenkins-x/go-scm and switch out the current Prow agents and instead use a single
tekton agent using the PipelineLauncher to trigger pipelines.
The following environment variables are used:
||the kind of git server:
||the URL of the server if not using the public hosted git providers: https://github.com or https://bitbucket.org https://gitlab.com|
||the git user (bot name) to use on git operations|
||the git token to perform operations on git (add comments, labels etc)|
||the token sent from the git provider in webhooks|
||the service account to use for generated pipelines|
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