repo-sync.yml

name: Repo Sync

# **What it does**: Syncs docs.getdbt.com public repo into the docs private repo
# This GitHub Actions workflow keeps the `current` branch of those two repos in sync.
# **Why we have it**: To keep the open-source repository up-to-date
# while still having an internal repository for sensitive work.
# For more details, see https://github.com/repo-sync/repo-sync#how-it-works

on:
  schedule:
    - cron: '0 6,12,18 * * *' # Run at 6:00 AM, 12:00 PM, and 6:00 PM

jobs:
  repo-sync:
    permissions:
      contents: write
      pull-requests: write
    name: Repo Sync
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        # Use the INTERMEDIATE_BRANCH as the checkout reference
        ref: ${{ secrets.INTERMEDIATE_BRANCH }}
        token: ${{ secrets.GITHUB_TOKEN }}
        # Fetch all history for all branches and tags
        fetch-depth: 0  

    # Sync the source repo to the destination branch using repo-sync/github-sync
    - uses: repo-sync/github-sync@v2
      name: Sync repo to branch
      with:
        # Source repository to sync from
        source_repo: ${{ secrets.SOURCE_REPO }}
        # Source branch to sync from
        source_branch: current
        # Destination branch to sync to
        destination_branch: ${{ secrets.INTERMEDIATE_BRANCH }}
        github_token: ${{ secrets.WORKFLOW_TOKEN }}

    - name: Ship pull request
      uses: actions/github-script@v6
      with:
        github-token: ${{ secrets.WORKFLOW_TOKEN }}
        result-encoding: string
        script: |
            const {owner, repo} = context.repo;
            const head = '${{ secrets.INTERMEDIATE_BRANCH }}';
            const base = 'current'

            async function closePullRequest(prNumber) {
              console.log('closing PR', prNumber)
              await github.rest.pulls.update({
                owner,
                repo,
                pull_number: prNumber,
                state: 'closed'
              });
              console.log('closed PR', prNumber)
            }
          
            console.log('Creating new PR')
            let pull, pull_number
            try {
              const response = await github.rest.pulls.create({
                owner,
                repo,
                head,
                base,
                title: 'REPO SYNC - Public to Private',
                body: 'This is an automated pull request to sync changes between the public and private repos.',
              });
              pull = response.data
              pull_number = pull.number
              console.log('Created pull request successfully', pull.html_url)
          
              } catch (err) {
                // Don't error/alert if there's no commits to sync
                if (err.message?.includes('No commits')) {
                  console.log(err.message)
                  return
                }
                throw err
              }

              const { data: prFiles } = await github.rest.pulls.listFiles({ owner, repo, pull_number })
              if (prFiles.length) {
                console.log(prFiles.length, 'files have changed')
              } else {
                console.log('No files changed, closing')
                await closePullRequest(pull_number)
                return
              }
  
              console.log('Checking for merge conflicts')
              if (pull.mergeable_state === 'dirty') {
                console.log('Pull request has a conflict', pull.html_url)
                await closePullRequest(pull_number)
                throw new Error('PR has a conflict, please resolve manually')
              }
              console.log('No detected merge conflicts')
  
              
              console.log('Merging the PR')
              await github.rest.pulls.merge({
                owner,
                repo,
                pull_number,
                merge_method: 'merge',
              })
              console.log('Merged the PR successfully')