robostack/.github/workflows/automerge.yaml at main · RoboStack/robostack · GitHub

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name: Auto-merge

# Adding the "automerge" label to a pull request turns on GitHub's auto-merge: the
# pull request is merged as soon as the required checks ("All green") pass.
# Removing the label turns it off again. Pull requests without the label are never
# merged automatically. New commits pushed after the label was added remove it (and
# turn auto-merge off), so what gets merged is always what was looked at.
#
# pull_request_target so that the token can merge pull requests from forks too; the
# pull request's code is never checked out or run here.

on:
  pull_request_target:
    types: [labeled, unlabeled, synchronize]

permissions:
  contents: write
  pull-requests: write

jobs:
  automerge:
    if: github.event.action != 'synchronize' && github.event.label.name == 'automerge'
    concurrency:
      group: automerge-${{ github.event.pull_request.number }}
      cancel-in-progress: false
    runs-on: ubuntu-latest
    steps:
      # the base branch (pull_request_target's default), for pixi's gh: never the pull request's code
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
      - name: Disable git auto-maintenance
        run: git config --global maintenance.auto false && git config --global gc.auto 0
      - uses: prefix-dev/setup-pixi@v0.11.0
        with:
          locked: true  # the lock file must match pixi.toml
          pixi-version: v0.81.0
          cache-write: false  # saved from main only (pixi-cache.yaml)
      # The merge has to come from the bot (or a PAT): a merge made with the
      # workflow's own token would not trigger the main build workflow.
      - name: Bot token
        id: app
        if: vars.ROBOSTACK_BOT_CLIENT_ID != ''
        uses: actions/create-github-app-token@v3
        with:
          client-id: ${{ vars.ROBOSTACK_BOT_CLIENT_ID }}
          private-key: ${{ secrets.ROBOSTACK_BOT_PRIVATE_KEY }}
      - name: Turn auto-merge on or off
        env:
          GH_TOKEN: ${{ steps.app.outputs.token || secrets.GHA_PAT || github.token }}
          BOT_TOKEN: ${{ steps.app.outputs.token || secrets.GHA_PAT }}
          PR: ${{ github.event.pull_request.html_url }}
        run: |
          # labeled/unlabeled events can arrive out of order: go by the label the
          # pull request has now, not by the event
          enabled=$(pixi run gh pr view "$PR" --json labels --jq 'any(.labels[]; .name == "automerge")')
          if [ "$enabled" = true ]; then
            if [ -z "$BOT_TOKEN" ]; then
              echo "::error::auto-merge needs the bot app (ROBOSTACK_BOT_CLIENT_ID + ROBOSTACK_BOT_PRIVATE_KEY) or GHA_PAT: a merge with the workflow token doesn't start the build workflow"
              exit 1
            fi
            GH_TOKEN="$BOT_TOKEN" pixi run gh pr merge "$PR" --auto --merge
          else
            pixi run gh pr merge "$PR" --disable-auto
          fi

  drop-on-push:
    if: >-
      github.event.action == 'synchronize' &&
      contains(github.event.pull_request.labels.*.name, 'automerge')
    concurrency:
      group: automerge-${{ github.event.pull_request.number }}
      cancel-in-progress: false
    runs-on: ubuntu-latest
    steps:
      # the base branch (pull_request_target's default), for pixi's gh: never the pull request's code
      - uses: actions/checkout@v6
        with:
          persist-credentials: false
      - name: Disable git auto-maintenance
        run: git config --global maintenance.auto false && git config --global gc.auto 0
      - uses: prefix-dev/setup-pixi@v0.11.0
        with:
          locked: true  # the lock file must match pixi.toml
          pixi-version: v0.81.0
          cache-write: false  # saved from main only (pixi-cache.yaml)
      # removing the label with this token doesn't start the unlabeled run above, so
      # turn auto-merge off here as well
      - name: Remove the automerge label
        env:
          GH_TOKEN: ${{ github.token }}
          PR: ${{ github.event.pull_request.html_url }}
          BEFORE: ${{ github.event.before }}
          AFTER: ${{ github.event.after }}
        run: |
          pixi run gh pr edit "$PR" --remove-label automerge
          pixi run gh pr merge "$PR" --disable-auto || true
          pixi run gh pr comment "$PR" --body "New commits (${BEFORE:0:7}..${AFTER:0:7}) arrived after the \`automerge\` label was added, so the label was removed and auto-merge turned off. Add the label again once the new commits are reviewed."