bug when using --delete-conflicting-outputs

[juliocbcotta]

Running the command
~/git/plugin_gen.flutter/example (master*) $ flutter pub run build_runner build --delete-conflicting-outputs

If I ran the command multiple times, sometimes it works, sometimes it does not. If I delete the generated files by hand the next run works. Sometimes the command is able to remove the previous generated files.

Error:

You have hit a bug in build_runner
Please file an issue with reproduction steps at https://github.com/dart-lang/build/issues

FileSystemException: Cannot delete file, path = '/Users/juliocotta/git/plugin_gen.flutter/example/example/ios/.symlinks/plugins/flutter_gen_sample_plugin/lib/my_test_plugin.g.dart' (OS Error: No such file or directory, errno = 2)
dart:isolate  _RawReceivePortImpl._handleMessage

pub failed (1)

• Dart SDK Version (dart --version)

dart --version
Dart VM version: 2.5.0-dev.1.0.flutter-f29f41f1a5 (Wed Aug 7 12:03:10 2019 +0000) on "macos_x64"

• What package(s) from this repo you are using, and the version (i.e. build_runner 0.7.12)

My example uses build_runner: ^1.6.5
My generator uses build: ^1.1.5 , build_runner: ^1.6.5

• What builder(s) you are using (or writing yourself). Try to give a short summary of what they do.
  The ones in this repo https://github.com/BugsBunnyBR/plugin_gen.flutter

• Whether you are using Windows, MacOSX, or Linux (if applicable)

MacOSX

• Whether you are using Chrome, Safari, Firefox, Edge (if applicable)

not applicable

• Any other packages or constraints we should know about

The generator uses source_gen: ^0.9.4

Related:
flutter doctor -v
[✓] Flutter (Channel master, v1.8.5-pre.117, on Mac OS X 10.14.6 18G87, locale pt-BR)
• Flutter version 1.8.5-pre.117 at /Users/juliocotta/flutter/flutter
• Framework revision 83a8a575ee (3 days ago), 2019-08-10 12:38:20 -0700
• Engine revision ff49ca1c6e
• Dart version 2.5.0 (build 2.5.0-dev.1.0 f29f41f1a5)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.1)
• Android SDK at /Users/juliocotta/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.1
• ANDROID_HOME = /Users/juliocotta/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 10.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.3, Build version 10G8
• CocoaPods version 1.7.5

[✓] Android Studio (version 3.4)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 38.2.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[✓] IntelliJ IDEA Community Edition (version 2019.1)
• IntelliJ at /Applications/IntelliJ IDEA CE.app
• Flutter plugin version 34.0.4
• Dart plugin version 191.6183.88

[✓] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)

• No issues found!

[juliocbcotta]

I am generating 2 files, sometimes I get a similar error, but for the another file.

Unhandled exception:
FileSystemException: Cannot delete file, path = '/Users/juliocotta/git/plugin_gen.flutter/example/example/ios/.symlinks/plugins/flutter_gen_sample_plugin/lib/platform_plugin.g.dart' (OS Error: No such file or directory, errno = 2)
#0      _File._delete.<anonymous closure> (dart:io/file_impl.dart:291:9)
#1      _RootZone.runUnary (dart:async/zone.dart:1379:54)
#2      _FutureListener.handleValue (dart:async/future_impl.dart:126:18)
#3      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:639:45)
#4      Future._propagateToListeners (dart:async/future_impl.dart:668:32)
#5      Future._completeWithValue (dart:async/future_impl.dart:483:5)
#6      Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:513:7)
#7      _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#8      _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#9      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:116:13)
#10     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:173:5)

[jakemac53]

It sounds like the file is being deleted by some other process before the build system has a chance to delete it itself? It is worth noting that in general --delete-conflicting-outputs should only need to be passed for the first build after cloning the repo manually clearing the cache (.dart_tool/build directory).

Is it possible you had two build processes going at once? That would probably be the easiest way to get into a scenario like this.

[natebosch]

Please remember to use code fences around stack traces.

https://help.github.com/en/articles/creating-and-highlighting-code-blocks

[juliocbcotta]

@jakemac53 I rebooted my machine, opened Android Studio and only executed the command by the terminal. It still happens from time to time while editing some hand written files ( I am not firing the command and editing files at the same time, just to be clear).

[juliocbcotta]

Today I split my example project in two, it means I no longer generate two files at the same time.
I could not reproduce the error after that. So if team thinks it is ok to close this issue, I am fine with that.

[jakemac53]

Ok, I will go ahead and close this since we can't reproduce it. If we get more info we would be happy to re-investigate.