More.

Author: davidmorgan

build_runner/lib/src/bootstrap/bootstrap.dart

@@ -8,15 +8,15 @@ import 'package:built_collection/built_collection.dart';
 import 'package:io/io.dart';
 import 'package:package_config/package_config.dart';
 
-import '../logging/build_log.dart';
-import 'build_script_generate.dart';
+import '../internal.dart';
 import 'compiler.dart';
 import 'depfiles.dart';
 import 'runner.dart';
 
 // DO NOT SUBMIT
 // ignore_for_file: deprecated_member_use
 // ignore_for_file: only_throw_errors
+//
 
 class Bootstrapper {
   final Depfile buildRunnerDepfile = Depfile(
@@ -78,6 +78,18 @@ class Bootstrapper {
       await _checkBuildSource(force: buildRunnerHasChanged!);
       await _checkBuildDill();
 
+      if (buildRunnerHasChanged! ||
+          buildYamlHasChanged! ||
+          buildDillHasChanged!) {
+        // TODO separate script changes from yaml changes?
+        if (buildYamlHasChanged!) {
+          buildLog.fullBuildBecause(FullBuildReason.incompatibleScript);
+        } else {
+          buildLog.fullBuildBecause(FullBuildReason.incompatibleBuild);
+        }
+        buildProcessState.outputsAreFromStaleBuildScript = true;
+      }
+
       final exitCode = await Runner().run(arguments);
       if (exitCode != ExitCode.tempFail.code) {
         return exitCode;

build_runner/lib/src/bootstrap/bootstrapper.dart

@@ -3,6 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
 import 'dart:isolate';
 
 /// State for the whole build process.
@@ -21,6 +23,12 @@ class BuildProcessState {
   int? get isolateExitCode => _state['isolateExitCode'] as int?;
   set isolateExitCode(int? value) => _state['isolateExitCode'] = value;
 
+  /// Whether outputs are from a previous build script.
+  bool get outputsAreFromStaleBuildScript =>
+      _state['outputsAreFromStaleBuildScript'] as bool? ?? false;
+  set outputsAreFromStaleBuildScript(bool value) =>
+      _state['outputsAreFromStaleBuildScript'] = value;
+
   /// For `buildLog`, the log mode.
   BuildLogMode get buildLogMode => BuildLogMode.values.singleWhere(
     (mode) => mode.name == _state['buildLogMode'],
@@ -55,31 +63,33 @@ class BuildProcessState {
     _beforeSends.add(function);
   }
 
-  /// Sends `this` to [sendPort].
-  Future<void> send(SendPort? sendPort) async {
+  void write() async {
     for (final beforeSend in _beforeSends) {
       beforeSend();
     }
-    sendPort?.send(_state);
+    File(
+      '.dart_tool/build/entrypoint/state.json',
+    ).writeAsStringSync(json.encode(_state));
   }
 
   void doAfterReceive(void Function() function) {
     _afterReceives.add(function);
   }
 
-  /// Receives `this` from [sendPort], by sending a `SendPort` then listening
-  /// on its corresponding `ReceivePort`.
-  Future<void> receive(SendPort? sendPort) async {
-    if (sendPort == null) {
-      _state.clear();
-      return;
-    }
-    final receivePort = ReceivePort();
-    sendPort.send(receivePort.sendPort);
-    final received = await receivePort.first;
+  void read() async {
+    var data = <String, Object?>{};
+    try {
+      data =
+          json.decode(
+                File(
+                  '.dart_tool/build/entrypoint/state.json',
+                ).readAsStringSync(),
+              )
+              as Map<String, Object?>;
+    } catch (_) {}
     _state
       ..clear()
-      ..addAll(received as Map<String, Object?>);
+      ..addAll(data);
     for (final afterReceive in _afterReceives) {
       afterReceive();
     }