close-updated-prs.yml

name: Close updated PRs

on:
  pull_request_target:
    types:
      - synchronize

permissions:
  actions: write
  contents: read
  issues: write
  pull-requests: write

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  close-updated-pr:
    name: Close updated PR
    if: ${{ github.event.pull_request.draft == false }}
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ github.token }}
      REPOSITORY: ${{ github.repository }}
      PR_NUMBER: ${{ github.event.pull_request.number }}
      AFTER: ${{ github.event.after }}
    steps:
      - name: Close updated PR
        run: |
          set -euo pipefail

          body=$(cat <<'EOF'

          Closing this pull request: its branch was updated after the pull
          request was opened.

          Per our workflow, a new pull request is required when changes are made
          to an existing one. Please open a new pull request with the updated
          changes.

          If you wish to create an in progress pull request that you can push to,
          please draft a draft pull request.

          Please see [GitHub Pull Request Workflow](https://docs.suricata.io/en/latest/devguide/contributing/github-pr-workflow.html).

          EOF
          )

          gh api \
              --method POST \
              "/repos/${REPOSITORY}/issues/${PR_NUMBER}/comments" \
              -f body="${body}" \
              --silent

          gh api \
              --method PATCH \
              "/repos/${REPOSITORY}/pulls/${PR_NUMBER}" \
              -f state=closed \
              --silent

      # Run last: cancelling the runs for this push also cancels this run, so
      # this must come after the PR has already been closed.
      - name: Cancel running workflows for this push
        run: |
          set -euo pipefail

          for status in queued in_progress; do
              gh api --paginate \
                  "/repos/${REPOSITORY}/actions/runs?head_sha=${AFTER}&status=${status}" \
                  --jq '.workflow_runs[].id' | while read -r run_id; do
                  gh api \
                      --method POST \
                      "/repos/${REPOSITORY}/actions/runs/${run_id}/cancel" \
                      --silent || true
              done
          done