🤖 LabHub
A GitHub bot written in Rust for using GitLab CI in OSS projects.
✔️ Features
- Listens for webhooks from GitHub
- Pushes new branches to GitLab for external (forked) PRs
- Possibly more coming soon 👻
Not implemented:
- No periodic reconciling of GitLab branches with open PRs: if a webhook is missed for any reason, the GitLab pipeline may not correctly reflect the PR state
⁉️ The Problem
GitLab has a great CI system, however it's not suitable for open source projects 😧 (at the time of writing) because it won't build external PRs by default. There are security concerns about the risk of exposing secrets in external builds, and GitLab errs on the side of caution by not building external PRs by default.
For more details on the issue, please take a look at this GitLab discussion.
✨ The Solution
If you're not concerned with leaking secrets, then LabHub may be for you! LabHub listens for webhooks from GitHub to notify for new pull requests. If the PR is from a forked repo, it will push a branch to GitLab (for the corresponding PR) to test the build.
🏃♀️ In Action
Using LabHub? Open a PR to add your project here! 😀
LabHub is currently being used by the following projects:
🖥 Compiling
LabHub requires Rust nightly. To compile using rustup:
$ rustup toolchain install nightly
$ rustup default nightly
$ cargo build
Be sure to switch back to stable with rustup default stable if that's your preferred toolchain.
🎛 Configuration
LabHub is configured using LabHub.toml. For details, see src/config.rs. You can specify the path to LabHub.toml by setting the LABHUB_TOML environment variable.
🚀 Deployment
↩ Setup Webhooks
You'll need to set up webhooks for any repo you wish to enable LabHub for. Currently, only GitHub webhooks are required. To get started, go to github.com/<org>/<repo>/settings/hooks and add a new webhook.
Configure the webhook to send PR and push events.
- Set the payload URL path to
/github/events, which is the path LabHub is expecting for GitHub events. - Create a secrete (ex:
cat /dev/urandom | LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1) and set the same value in the webhook config as in LabHub. - Make sure the payload type is
application/json. - Here's how your webhook should look
🔑 Create SSH keys
You'll need a CI user with SSH keys for both GitHub and GitLab. Create an account on both sites (if you don't already have a CI user), and create an SSH key for LabHub:
$ ssh-keygen -f labhub-key.ecdsa -t ecdsa -b 521
Keep labhub-key.ecdsa safe, and upload labhub-key.ecdsa.pub to both GitHub and GitLab for the CI user.
☸️ Deploy to Kubernetes with Helm
There's a Helm chart included in this repo, which is the preferred method of deployment. To use you, you must first create the SSH key secrets with kubectl. Assuming your SSH private key is labhub-key.ecdsa:
$ kubectl create secret generic labhub-ssh-keys --from-file=github=labhub-key.ecdsa --from-file=gitlab=labhub-key.ecdsa
You may use separate keys for GitHub and GitLab if you choose, respectively.
Once you have the secrets, install the helm chart from helm/labhub/:
$ cd helm/labhub/
$ cp values.yaml myvalues.yaml
### Edit myvalues.yaml to your liking ###
$ helm upgrade --install labhub . -f myvalues.yaml