.github/workflows/flutter-prep.yaml

# Copyright 2023 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

name: Flutter SDK prep

on:
  workflow_call:
    inputs:
      os-name:
        description: 'The OS to run against, either "macos" or "ubuntu". If neither is provided, will run against both.'
        type: string

    outputs:
      latest_flutter_candidate:
        description: "The latest Flutter candidate version."
        value: ${{ jobs.reusable-flutter-prep.outputs.latest_flutter_candidate }}

jobs:
  reusable-flutter-prep:
    name: ${{ matrix.os }} Flutter Prep
    outputs:
      latest_flutter_candidate: ${{ steps.flutter-candidate.outputs.FLUTTER_CANDIDATE }}
    strategy:
      matrix:
        os: ${{ (inputs.os-name == 'macos' && fromJSON('[ "macos-latest"]')) || (inputs.os-name == 'ubuntu' && fromJSON('[ "ubuntu-latest"]')) || fromJSON('["ubuntu-latest", "macos-latest"]') }}
    runs-on: ${{ matrix.os }}
    steps:
      # TODO(https://github.com/flutter/devtools/issues/5729) Consider caching DevTools so that we
      # don't check it out again is subsequent workflows.
      - name: Checkout DevTools (default)
        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac

      - name: Get Latest Flutter Candidate
        id: flutter-candidate
        run: |
          LATEST_FLUTTER_CANDIDATE=$(./tool/latest_flutter_candidate.sh)
          echo "FLUTTER_CANDIDATE=$LATEST_FLUTTER_CANDIDATE" >> $GITHUB_OUTPUT

      - name: Load Cached Flutter SDK
        id: cache-flutter
        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84
        with:
          path: |
            ./tool/flutter-sdk
          key: flutter-sdk-${{ runner.os }}-${{ steps.flutter-candidate.outputs.FLUTTER_CANDIDATE }}

      - if: ${{ steps.cache-flutter.outputs.cache-hit != 'true' }}
        name: Clone Flutter SDK if none cached
        run: |
          git clone https://github.com/flutter/flutter.git ./tool/flutter-sdk
          cd tool/flutter-sdk
          git checkout $LATEST_FLUTTER_CANDIDATE
        env:
          LATEST_FLUTTER_CANDIDATE: ${{ steps.flutter-candidate.outputs.FLUTTER_CANDIDATE }}

      - name: Assert that the Latest Flutter Candidate is checked out
        run: |
          cd tool/flutter-sdk
          HEAD_SHA=$(git rev-parse HEAD)
          LATEST_FLUTTER_CANDIDATE_SHA=$(git rev-list -1 "$LATEST_FLUTTER_CANDIDATE")
          if [ "$HEAD_SHA" != "$LATEST_FLUTTER_CANDIDATE_SHA" ]; then
            echo "::error ,title=Error checking out Latest Flutter Candidate::{expected HEAD to be at $LATEST_FLUTTER_CANDIDATE_SHA but got $HEAD_SHA}"
            exit 1
          fi
        env:
          LATEST_FLUTTER_CANDIDATE: ${{ steps.flutter-candidate.outputs.FLUTTER_CANDIDATE }}

      - name: Setup Flutter SDK
        run: |
          ./tool/flutter-sdk/bin/flutter config --disable-analytics
          ./tool/flutter-sdk/bin/cache/dart-sdk/bin/dart --disable-analytics
          ./tool/flutter-sdk/bin/flutter doctor