Advanced Commit Linter

Advanced Commit Linter is a GitHub Action that lint commit messages of PR. It checks for issue trackers and upstream references. Results are displayed as a status check and Pull Request comment.

How does it work

TBA

Features

Tracker references validator
Upstream references (cherry-pick) validator
Summary comment on Pull Request

Usage

To set up Advanced Commit Linter, we need three files:

Workflow that captures Pull Request metadata (number and commit metadata) and uploads this data as an artifact
Workflow that runs on workflow-run trigger, downloads artifact, and runs advanced-commit-linter GitHub Action
advanced-commit-linter.yml configuration

Note: Setup is complicated due to GitHub permissions on GITHUB_TOKEN. When used in workflow executed from fork it has read-only permissions. By using the workflow-run trigger we are able to safely overcome this limitation and it allows us to comment on Pull Requests.

policy:
  cherry-pick:
    upstream:
      - github: systemd/systemd
      - github: systemd/systemd-stable
    exception:
      note:
        - rhel-only
  tracker:
    - keyword:
        - 'Resolves: #'
        - 'Related: #'
      type: bugzilla
      issue-format:
        - '[0-9]+$'
      url: 'https://bugzilla.redhat.com/show_bug.cgi?id='
      exception:
        note:
          - github-only
    - keyword:
        - 'Resolves: '
        - 'Related: '
      type: jira
      issue-format:
        - 'JIRA-1234'
      url: 'https://issues.redhat.com/browse/'
      exception:
        note:
          - github-only

name: Gather Pull Request Metadata
on:
  pull_request:
    types: [ opened, reopened, synchronize ]
    branches: [ main ]

permissions:
  contents: read

jobs:
  gather-metadata:
    runs-on: ubuntu-latest

    steps:
      - name: Repository checkout
        uses: actions/checkout@v3

      - id: Metadata
        name: Gather Pull Request Metadata
        uses: redhat-plumbers-in-action/gather-pull-request-metadata@v1

      - name: Upload artifact with gathered metadata
        uses: actions/upload-artifact@v3
        with:
          name: pr-metadata
          path: ${{ steps.Metadata.outputs.metadata-file }}

name: Commit Linter
on:
  workflow_run:
    workflows: [ Gather Pull Request Metadata ]
    types:
      - completed

permissions:
  contents: read

jobs:
  download-metadata:
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest

    outputs:
      pr-metadata: ${{ steps.Artifact.outputs.pr-metadata-json }}

    steps:
      - id: Artifact
        name: Download Artifact
        uses: redhat-plumbers-in-action/download-artifact@v1
        with:
          name: pr-metadata

  commit-linter:
    needs: [ download-metadata ]
    runs-on: ubuntu-latest

    outputs:
      validated-pr-metadata: ${{ steps.commit-linter.outputs.validated-pr-metadata }}

    permissions:
      # required for creation of checks
      checks: write
      # required for PR comments
      pull-requests: write

    steps:
      - id: commit-linter
        name: Lint Commits
        uses: redhat-plumbers-in-action/advanced-commit-linter@v1
        with:
          pr-metadata: ${{ needs.download-metadata.outputs.pr-metadata }}
          token: ${{ secrets.GITHUB_TOKEN }}

Configuration options

Action currently accepts the following options:

# ...

- uses: redhat-plumbers-in-action/advanced-commit-linter@v1
  with:
    pr-metadata: <pr-metadata.json>
    token:       <GitHub token or PAT>

# ...

pr-metadata

Stringified JSON Pull Request metadata provided by GitHub Action redhat-plumbers-in-action/gather-pull-request-metadata.

Pull Request metadata has the following format: metadata format

default value: undefined
requirements: required

token

GitHub token or PAT is used for creating comments on Pull Request and setting checks.

# required permission
permissions:
  checks: write
  pull-requests: write

default value: undefined
requirements: required
recomended value: secrets.GITHUB_TOKEN

Policy

Action is configured using special policy file: .github/advanced-commit-linter.yml. The structure needs to be as follows:

policy:
  cherry-pick:
    upstream:
      - github: systemd/systemd
      - github: systemd/systemd-stable
    exception:
      note:
        - rhel-only
  tracker:
    - keyword:
        - 'Resolves: #'
        - 'Related: #'
      type: bugzilla
      issue-format:
        - '[0-9]+$'
      url: 'https://bugzilla.redhat.com/show_bug.cgi?id='
      exception:
        note:
          - github-only
    - keyword:
        - 'Resolves: '
        - 'Related: '
      type: jira
      issue-format:
        - 'JIRA-1234'
      url: 'https://issues.redhat.com/browse/'
      exception:
        note:
          - github-only

`cherry-pick` keyword

The section that specifies upstreams for which you frequently cherry-pick.

requirements: optional

`cherry-pick.upstream` keyword

An array of upstreams. Currently, the only supported upstream location is GitHub.

Supported keys:

github - GitHub repository in format <org>/<repo>
requirements: required

`cherry-pick.exception` keyword

Property that describes possible exceptions for referencing upstream commits in commit messages. Currently supported exceptions:

note - for example downstream-only or rhel-only

`tracker` keyword

The section specifies the form and type of required trackers.

`tracker[].keyword` keyword

Keyword that prefixes tracker identificator.

requirements: required
example: Fixes:

`tracker[].type` keyword

Type of tracker. Data can be used by postprocessing scripts/GitHub Actions.

Currently supproted types of trackers are: bugzilla, jira and unknown.

requirements: required

`tracker[].issue-format` keyword

Regex that describes identificator of given tracker.

requirements: required
example: [0-9]+$

`tracker[].url` keyword

Url to better display detected trackers in Pull Request comment as a link. Tracker ID will be appended at the end of url.

requirements: optional
example: https://issues.redhat.com/browse/

`tracker[].exception` keyword

Property that describes possible exceptions for referencing trackers in commit messages. Currently supported exceptions:

note - for example github-only or tests-only

Outputs

validated-pr-metadata

TBA

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GitHub Action

Advanced Commit Linter