name: Checkout
description: Clone repository with configurable depth

inputs:
  repository:
    description: Repository to clone (owner/repo)
    default: ${{ github.repository }}
  ref:
    description: Branch, tag, or SHA to checkout
    default: ${{ github.ref_name }}
  depth:
    description: Clone depth (0 for full history)
    default: '1'
  token:
    description: Token for private repositories
    default: ${{ github.token }}

runs:
  using: composite
  steps:
    - shell: bash
      run: |
        URL="https://oauth2:${{ inputs.token }}@git.flowmade.one/${{ inputs.repository }}.git"
        clone() {
          if [ "${{ inputs.depth }}" = "0" ]; then
            git clone "$URL" .
          else
            git clone --depth "${{ inputs.depth }}" --branch "${{ inputs.ref }}" "$URL" .
          fi
        }

        # Runner egress is flaky (transient DNS/connection failures to the git
        # server); retry with backoff before failing the job.
        ok=0
        for attempt in 1 2 3; do
          if clone; then
            ok=1
            break
          fi
          if [ "$attempt" -eq 3 ]; then
            break
          fi
          echo "clone failed, retrying in $((attempt * 10))s..."
          sleep $((attempt * 10))
        done
        [ "$ok" -eq 1 ] || exit 1