scripts/bin/update.dart

#! /usr/bin/env dart
// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:args/args.dart';
import 'package:file/file.dart';
import 'package:file/local.dart';
import 'package:scripts/src/dockerfile.dart';
import 'package:scripts/src/http.dart' as http;
import 'package:scripts/src/versions.dart';

/// Downloads the latest versions on the Dart stable and beta channels and the
/// relevant SHA256 checksums. For all versions that haven't changed, the script
/// verifies that the checksums are still matching.
void main(List<String> args) async {
  final results = (ArgParser()..addFlag('force', abbr: 'f')).parse(args);
  final force = results['force'];
  await update(const LocalFileSystem(), http.read, force);
}

Future<void> update(
  FileSystem fileSystem,
  http.HttpRead read,
  bool force,
) async {
  final versions = versionsFromFile(fileSystem, read);
  final updated = <DartSdkVersion>{};
  await for (final version in Stream.fromIterable(versions.values)) {
    if (await version.update() || force) {
      updated.add(version);
    }
  }
  if (force || updated.isNotEmpty) {
    final template = fileSystem
        .file('Dockerfile-debian.template')
        .readAsStringSync();
    writeVersionsFile(fileSystem, [versions['stable']!, versions['beta']!]);
    for (final version in updated) {
      final dockerfileContent = buildDockerfile(version, template);
      final dockerfile =
          (await fileSystem
                  .directory('${version.channel}/trixie')
                  .create(recursive: true))
              .childFile('Dockerfile');
      await dockerfile.writeAsString(dockerfileContent);
    }
  }
}