update_truth.yml

name: Update Truth Data

on:
  workflow_dispatch:
    inputs:
      pull_requests:
        description: 'Pull request(s) that warranted update, e.g. "#123" or "#123 and dtcenter/MET#123"'
        required: true
      change_summary:
        description: 'Summary of changes to truth data'
        required: true

jobs:
  update_truth:
    name: "Update truth reference branch"
    runs-on: ubuntu-latest
    steps:
      - name: Check if branch is develop or main_vX.Y
        run: |
          branch_name=${GITHUB_REF#refs/heads/}
          echo "branch_name=$branch_name" >> $GITHUB_ENV
          if [[ $branch_name == "develop" ]] || \
             [[ $branch_name =~ ^main_v[0-9]+\.[0-9]+$ ]]; then
            echo Branch is valid - $branch_name
            exit 0
          fi
          echo ERROR: Branch is $branch_name - must be develop or match main_vX.Y
          exit 1
      - uses: actions/checkout@v4
        name: Checkout repository
        with:
          fetch-depth: 0
          token: ${{ secrets.METPLUS_BOT_TOKEN }}
      - name: Resolve conflicts between branch and branch-ref
        id: resolve_conflicts
        run: |
          branch_name=${{ env.branch_name }}
          cd ${GITHUB_WORKSPACE}
          if [[ -z "$(git ls-remote --heads origin ${branch_name}-ref)" ]]; then
            echo ERROR: ${branch_name}-ref does not exist
            exit 1
          fi
          
          echo ${branch_name}-ref does exist -- update it
          git config --global user.name "metplus-bot"
          git config --global user.email "97135045+metplus-bot@users.noreply.github.com"
          # checkout branch (develop or main_vX.Y)
          echo git checkout ${branch_name}
          git checkout ${branch_name}

          # create unique branch name to update *-ref branch
          update_branch=update_${branch_name}_$(uuidgen | cut -d "-" -f1)
          echo "update_branch=${update_branch}" >> $GITHUB_OUTPUT

          # create update branch from branch (develop or main_vX.Y)
          echo git checkout -b ${update_branch}
          git checkout -b ${update_branch}

          # merge -ref branch into update branch (favoring branch changes)
          echo git merge -s ours origin/${branch_name}-ref
          git merge -s ours origin/${branch_name}-ref

          change_log_path=.github/update_truth_change_log.txt

          # get truth change log from *-ref branch
          cmd="git checkout origin/${branch_name}-ref -- ${change_log_path}"
          echo $cmd
          $cmd | true

          # create or append to file to track truth data changes
          # and ensure that PR merge into *-ref branch triggered testing workflow
          change_entry="[$(date +%Y%m%d_%H:%M:%S) ${branch_name}] ${{ github.event.inputs.pull_requests }} - ${{ github.event.inputs.change_summary }}"
          echo "${change_entry}" >> ${change_log_path}

          # add file if it does not already exist
          cmd="git add ${change_log_path}"
          echo $cmd
          $cmd

          # commit changes to change log file
          echo git commit ${change_log_path}
          git commit -m "added entry to update truth change log: ${branch_name} ${{ github.event.inputs.pull_requests }}" ${change_log_path}

          # push changes to update branch on GitHub
          cmd="git push origin ${update_branch}"
          echo $cmd
          $cmd

      # create pull request from $HEAD into $BASE
      - name: Create Pull Request
        run: gh pr create --head $HEAD --base $BASE --body "$BODY" --title "$TITLE"
        env:
          GH_TOKEN: ${{ github.token }}
          HEAD: ${{ steps.resolve_conflicts.outputs.update_branch }}
          BASE: ${{ env.branch_name }}-ref
          BODY: ${{ github.event.inputs.change_summary }}<br/>Created by @${{ github.actor}}
          TITLE: Update ${{ env.branch_name }}-ref after ${{ github.event.inputs.pull_requests }}