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Welcome to knobots

This repository contains a number of github actions, which perform routine maintenance tasks for a variety of repositories, mostly for the knative org. In particular, this repo exists separately from other repos like https://github.com/knative/test-infra to enable using repository secrets to hold an access token for creating automated PRs.

If you want to run a job periodically against a repo, the workload-templates folder holds all the template actions which are copied to all the repos in Knative using the update-actions workflow in this repo.

Adding a repo

To add a repository here, there are two requirements:

  1. Add an entry to repos.yaml containing an entry like this:

     - # name is the repository to operate on, think: https://github.com/{name}.git
   name: 'knative/pkg'

   # meta-organization is the github organization from which to sync Github
   # actions, think: https://github.com/{meta-organization}/hack
   # Actions are pulled from the workflow-templates directory.
   meta-organization: 'knative'

   # fork is the name of the fork to push to (otherwise a branch on the
   # main repo is used)
   fork: 'knative-automation/pkg'

   # channel is the channel on knative.slack.com to post when these actions fail.
   # These can be a direct-message to a username if prefixed with `@`
   channel: 'serving-api'

   # The list of users to which the PR should be `/assign` (only matters for Prow)
   # These should bias toward Github teams, but must exist within the target
   # organization (so knative[-sandbox] should use the team in their respective org).
   assignees: knative/foo-wg-leads

  2. github.com/{fork}.git must be a fork of {name} (if specified) and knative-automation must have push access.

  3. Repos can also optionally exclude certain jobs by adding their name to the appropriate {foo}-exclude.yaml file.

Adding new automation

This repo exists to run GitHub Actions to create automated management PRs against other repos in Knative. To add a new automated PR workflow (or update one of the existing workflows), it's worth understanding the different components in this repo:

  • .github/workflows contains the actual GitHub Actions, in the Actions yaml format. These are (mostly) generated from the actions directories mentioned below, but a few are hand-maintained. For the generated workflows, run go run ./cmd/gen-actions at the root of the repo to regnerate the files, which will need to be checked in / PR'ed if changed.

  • actions contains a set of GitHub Actions, either as Dockerfile actions or Javascript actions. Each directory under actions should contain the following:

    • action.yaml -- GitHub actions configuration. This file makes the directory an action.

    • Dockerfile (and probably entrypoint.sh) for Docker-based Actions OR index.js and package-lock.json et al for Javascript actions

    • If you want the action to be run against each repo configured in repos.yaml, add an auto-apply.yaml (schema here). This will cause the gen-actions tool (see below) to generate a github/workflows file which will fan out your command to all repos.

      It's expected that an auto-apply action will modify the checked-out workspace; these changes will export a create_pr variable (set to true if a PR shoud be created) and optionally a log output.

  • cmd/gen-actions contains a script (main.go) and a template {actions_template.yaml) for generating fan-out PR generation workflows for all the actions directories which include an auto-apply.yaml.

    The parameters set in auto-apply.yaml are passed in to the actions_template.yaml, along with a github formatting function which passes through the remianing arguments to the GitHub Actions templating system (both use the same {{...}} syntax for templating, so any GitHub templating needs to be escaped from the Go templates).

    This script should stay fairly short; it's written in Go for two reasons:

    1. Go is a common language across Knative, and has sufficiently rich templating
    2. Using Go enables the script to work even on Windows machines, which is a nice benefit