markelliot/automerge

Automatically merge approved pull requests with successful checks.

Automerge Action

This action automatically enables “auto-merge” for pull requests under the following conditions:

• The pull request is not a draft.
• The associated branch has at least one required status check.
• All required labels are applied.
• No “do not merge” labels are applied.

Ensure the following is set up in your repository settings before enabling this action:

• The “Require pull request reviews before merging” rule and the additional “Dismiss stale pull request approvals when new commits are pushed” rule are enabled for the branch. This ensures that no changes to the pull request are possible between the approval and the automatic merging.

• The “Require status checks to pass before merging” rule is enabled and at least one status check is selected.

  Consider also adding this action as an additional required status check. Read the Known Issues section on why.

• “Allow auto-merge” is enabled.

Inputs

Name	Required	Description
token	yes	A GitHub Token other than the default GITHUB_TOKEN needs to be specified in order to be able to enable auto-merge.
merge-method	no	Specify which merge method to use. By default, will select the first one available in this order: merge, squash, rebase
squash-title	no	Use the pull request title as the commit message when squashing.
do-not-merge-labels	no	When any of the labels in this comma-separated list is applied to a pull request, it will not be merged automatically.
required-labels	no	Comma-separated list of labels that are required to be applied to a pull request for it to be merged automatically.
pull-request	no	Try merging the specified pull request automatically. For example, you can pass an input from a workflow_dispatch event.
pull-request-author-associations	no	Comma-separated list of required author associations for the pull request author. (By default, pull requests by any author are allowed.)
dry-run	no	If set to true, will not actually merge pull requests but still perform all other checks.

Example Workflow

name: Automerge

on:
  # Try enabling auto-merge for all open pull requests. (Only recommended for testing.)
  push:

  # Try enabling auto-merge for all open pull requests.
  schedule:
    - cron: 0 * * * *

  # Try enabling auto-merge for a pull request when a draft is marked as “ready for review”, when
  # a required label is applied or when a “do not merge” label is removed, or when a pull request
  # is updated in any way (opened, synchronized, reopened, edited).
  pull_request_target:
    types:
      - opened
      - synchronized
      - reopened
      - edited
      - labeled
      - unlabeled
      - ready_for_review

  # Try enabling auto-merge for the specified pull request or all open pull requests if none is specified.
  workflow_dispatch:
    inputs:
      pull-request:
        description: Pull Request Number
        required: false

jobs:
  automerge:
    runs-on: ubuntu-latest
    steps:
      - uses: reitermarkus/automerge@v2
        with:
          token: ${{ secrets.MY_GITHUB_TOKEN }}
          merge-method: rebase
          do-not-merge-labels: never-merge
          required-labels: automerge
          pull-request: ${{ github.event.inputs.pull-request }}
          dry-run: true

Known Issues

If the action is triggered via a label on a pull request that is already ready to merge, the GitHub auto-merge feature cannot be enabled on that pull request anymore. A workaround is to add the workflow containing this actions as a required status check. This way the pull request will become unmergable while the action is running, allowing auto-merge to be enabled.