add_milestone.yml

name: Add Milestone on a Merged PR

on:
  pull_request:
    types:
      - closed
    branches:
      - main
      - "[0-9]+.[0-9]+.x"

jobs:
  add-milestone-pr:
    name: Add Milestone on PR
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      GH_REPO: ${{ github.repository }}
    steps:
      - name: Checkout datadog-agent repository
        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4

      - name: Get repo current milestone
        id: current-milestone
        run: |
          if [[ ${GITHUB_REF##*/} =~ ^7\.[0-9]+\.[0-9]+$ ]]; then
            # If we're on a release branch, set the milestone to the latest release milestone found.
            MILESTONE=$(gh release list | grep -o $(echo ${GITHUB_REF##*/} | sed 's/x/[0-9]*/g') | sort -uV | tail -1)
            if [ -z "$MILESTONE" ]; then
              echo "Error: Couldn't get the latest release milestone from Github."
              exit 1
            fi
          else
            # Else use the current_milestone field in the release.json file.
            MILESTONE=$(cat release.json | jq -r .current_milestone)
            if [ -z "$MILESTONE" ]; then
              echo "Error: Couldn't find the current_milestone field in the release.json file."
              exit 1
            fi
          fi
          if [[ ! $MILESTONE =~ ^7\.[0-9]+\.[0-9]+$ ]]; then
            echo "Error: Malformed milestone $MILESTONE. It should be of the form '7.x.y'."
            exit 1
          fi
          echo "MILESTONE=$MILESTONE" >> "$GITHUB_OUTPUT"

      - name: Set the merged PR milestone to current_milestone from release.json
        run: |
          echo "Setting milestone $MILESTONE to PR $NUMBER."
          gh issue edit "$NUMBER" --milestone "$MILESTONE"
        env:
          NUMBER: ${{ github.event.number }}
          MILESTONE: ${{ steps.current-milestone.outputs.MILESTONE }}