on-pr-closed.yml

name: On PR Closed - Copy Issue Labels

on:
  pull_request:
    types:
      - closed

jobs:
  copy-labels:
    name: Copy linked issue labels
    runs-on: ubuntu-latest
    steps:
      - name: copy labels
        env:
          GITHUB_TOKEN: ${{ secrets.GH_CLI_TOKEN }}
          PR_NUMBER: ${{ github.event.number }}
        run: |
          org=${{ github.repository_owner }}
          repo=psibase
          pr_number=$PR_NUMBER
          issue_number=$(gh api graphql -F owner="$org" -F repo="$repo" -F pr=$pr_number -f query='
          query ($owner: String!, $repo: String!, $pr: Int!) {
            repository(owner: $owner, name: $repo) {
              pullRequest(number: $pr) {
                closingIssuesReferences(first: 1) {
                  nodes {
                    number
                  }
                }
              }
            }
          }'  --jq '.data.repository.pullRequest.closingIssuesReferences.nodes[].number')

          if [ -z "${issue_number}" ]; then
          echo "No issue linked to this PR"
          exit 0
          fi

          labels=$(gh api "repos/$org/$repo/issues/$issue_number/labels" --jq 'map(.name) | join(",")')

          if [ -z "${labels}" ]; then
          echo "No labels on linked issue"
          exit 0
          fi

          json_labels="[\"$(echo "$labels" | sed 's/,/","/g')\"]"
          echo "{\"labels\":$json_labels}" > input.json
          gh api "repos/$org/$repo/issues/$pr_number/labels" -X POST --input input.json
          rm input.json