|
1 | 1 | name: "Pull Request Labeler" |
| 2 | + |
2 | 3 | on: |
3 | | -- pull_request_target |
| 4 | + schedule: |
| 5 | + # Reconcile recently updated PRs promptly, including unapproved forks and |
| 6 | + # conflicted PRs for which pull_request workflows do not run. |
| 7 | + - cron: "7,22,37,52 * * * *" |
| 8 | + # Reconcile one stable shard of all open PRs each hour to recover from |
| 9 | + # delayed or missed scheduled runs. |
| 10 | + - cron: "12 * * * *" |
| 11 | + workflow_dispatch: |
| 12 | + inputs: |
| 13 | + pr_number: |
| 14 | + description: "Open pull request number to reconcile" |
| 15 | + required: true |
| 16 | + type: string |
| 17 | + |
| 18 | +permissions: {} |
4 | 19 |
|
5 | | -permissions: |
6 | | - contents: read |
7 | | - pull-requests: write |
| 20 | +concurrency: |
| 21 | + group: pull-request-labeler |
| 22 | + cancel-in-progress: false |
8 | 23 |
|
9 | 24 | jobs: |
10 | 25 | triage: |
| 26 | + if: github.ref_name == github.event.repository.default_branch |
11 | 27 | runs-on: ubuntu-latest |
| 28 | + timeout-minutes: 30 |
| 29 | + permissions: |
| 30 | + contents: read |
| 31 | + pull-requests: write |
12 | 32 | steps: |
13 | | - - uses: actions/labeler@v4 |
14 | | - with: |
15 | | - repo-token: "${{ secrets.GITHUB_TOKEN }}" |
| 33 | + - uses: actions/checkout@v5 |
| 34 | + with: |
| 35 | + persist-credentials: false |
| 36 | + sparse-checkout: .github/labeler.yml |
| 37 | + sparse-checkout-cone-mode: false |
| 38 | + |
| 39 | + - name: Collect pull requests to reconcile |
| 40 | + id: collect |
| 41 | + env: |
| 42 | + GH_TOKEN: ${{ github.token }} |
| 43 | + REPO: ${{ github.repository }} |
| 44 | + EVENT_NAME: ${{ github.event_name }} |
| 45 | + SCHEDULE: ${{ github.event.schedule }} |
| 46 | + REQUESTED_PR: ${{ inputs.pr_number }} |
| 47 | + run: | |
| 48 | + set -euo pipefail |
| 49 | +
|
| 50 | + if [ "$EVENT_NAME" = "workflow_dispatch" ]; then |
| 51 | + if [[ ! "$REQUESTED_PR" =~ ^[1-9][0-9]*$ ]]; then |
| 52 | + echo "Invalid pull request number: $REQUESTED_PR" |
| 53 | + exit 1 |
| 54 | + fi |
| 55 | +
|
| 56 | + pr_json=$(gh api "repos/$REPO/pulls/$REQUESTED_PR") |
| 57 | + candidates=$(jq -c '[{ |
| 58 | + number: .number, |
| 59 | + head_sha: .head.sha |
| 60 | + }]' <<<"$pr_json") |
| 61 | + else |
| 62 | + pulls_json=$(gh api --paginate \ |
| 63 | + "repos/$REPO/pulls?state=open&sort=updated&direction=desc&per_page=100" | |
| 64 | + jq -cs 'add') |
| 65 | +
|
| 66 | + if [ "$SCHEDULE" = "12 * * * *" ]; then |
| 67 | + shard=$(( ($(date -u +%s) / 3600) % 6 )) |
| 68 | + candidates=$(jq -c --argjson shard "$shard" \ |
| 69 | + '[.[] | select((.number % 6) == $shard) | { |
| 70 | + number: .number, |
| 71 | + head_sha: .head.sha |
| 72 | + }]' <<<"$pulls_json") |
| 73 | + else |
| 74 | + cutoff=$(date -u -d "1 hour ago" "+%Y-%m-%dT%H:%M:%SZ") |
| 75 | + # Hourly shards reconcile any candidates beyond this API budget. |
| 76 | + candidates=$(jq -c --arg cutoff "$cutoff" \ |
| 77 | + '[.[] | select(.updated_at >= $cutoff) | { |
| 78 | + number: .number, |
| 79 | + head_sha: .head.sha |
| 80 | + }][0:100]' <<<"$pulls_json") |
| 81 | + fi |
| 82 | + fi |
| 83 | +
|
| 84 | + echo "Collected $(jq 'length' <<<"$candidates") pull request(s)." |
| 85 | + { |
| 86 | + echo "candidates<<EOF" |
| 87 | + echo "$candidates" |
| 88 | + echo "EOF" |
| 89 | + } >> "$GITHUB_OUTPUT" |
| 90 | +
|
| 91 | + - name: Validate pull request state |
| 92 | + id: validate |
| 93 | + env: |
| 94 | + GH_TOKEN: ${{ github.token }} |
| 95 | + REPO: ${{ github.repository }} |
| 96 | + CANDIDATES: ${{ steps.collect.outputs.candidates }} |
| 97 | + run: | |
| 98 | + set -euo pipefail |
| 99 | +
|
| 100 | + valid_numbers=() |
| 101 | + while IFS=$'\t' read -r pr_number expected_sha; do |
| 102 | + if [[ ! "$pr_number" =~ ^[1-9][0-9]*$ ]] || |
| 103 | + [[ ! "$expected_sha" =~ ^[0-9a-f]{40}$ ]]; then |
| 104 | + echo "Skipping malformed pull request candidate." |
| 105 | + continue |
| 106 | + fi |
| 107 | +
|
| 108 | + if ! pr_json=$(gh api "repos/$REPO/pulls/$pr_number"); then |
| 109 | + echo "Pull request #$pr_number could not be fetched; skipping." |
| 110 | + continue |
| 111 | + fi |
| 112 | +
|
| 113 | + if ! jq -e \ |
| 114 | + --arg repo "$REPO" \ |
| 115 | + --arg sha "$expected_sha" \ |
| 116 | + '.state == "open" and |
| 117 | + .base.repo.full_name == $repo and |
| 118 | + .head.sha == $sha and |
| 119 | + (.head.repo.full_name | type == "string")' \ |
| 120 | + >/dev/null <<<"$pr_json"; then |
| 121 | + echo "Pull request #$pr_number changed or is no longer open; skipping." |
| 122 | + continue |
| 123 | + fi |
| 124 | +
|
| 125 | + valid_numbers+=("$pr_number") |
| 126 | + done < <(jq -r '.[] | [.number, .head_sha] | @tsv' <<<"$CANDIDATES") |
| 127 | +
|
| 128 | + if [ "${#valid_numbers[@]}" -eq 0 ]; then |
| 129 | + echo "has_prs=false" >> "$GITHUB_OUTPUT" |
| 130 | + exit 0 |
| 131 | + fi |
| 132 | +
|
| 133 | + { |
| 134 | + echo "has_prs=true" |
| 135 | + echo "pr_numbers<<EOF" |
| 136 | + printf '%s\n' "${valid_numbers[@]}" |
| 137 | + echo "EOF" |
| 138 | + } >> "$GITHUB_OUTPUT" |
| 139 | +
|
| 140 | + - uses: actions/labeler@v4 |
| 141 | + if: steps.validate.outputs.has_prs == 'true' |
| 142 | + with: |
| 143 | + repo-token: "${{ github.token }}" |
| 144 | + pr-number: ${{ steps.validate.outputs.pr_numbers }} |
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