Bad state: No element in RunCMakeBuilder.androidToolchainCmake

[emersion]

Describe the bug
webcrypto.dart has migrated to native_toolchain_cmake in its latest release. Build fails in my app CI system since then.

Unhandled exception:
Bad state: No element
#0      List.first (dart:core-patch/growable_array.dart:352:5)
#1      RunCMakeBuilder.androidToolchainCmake (package:native_toolchain_cmake/src/builder/run_builder.dart:126:27)
<asynchronous suspension>
#2      RunCMakeBuilder._generateAndroidDefines (package:native_toolchain_cmake/src/builder/run_builder.dart:326:23)
<asynchronous suspension>
#3      RunCMakeBuilder._generate (package:native_toolchain_cmake/src/builder/run_builder.dart:195:21)
<asynchronous suspension>
#4      RunCMakeBuilder.run (package:native_toolchain_cmake/src/builder/run_builder.dart:177:22)
<asynchronous suspension>
#5      CMakeBuilder.run (package:native_toolchain_cmake/src/builder/builder.dart:344:5)
<asynchronous suspension>
#6      main.<anonymous closure> (file:///home/build/.pub-cache/hosted/pub.dev/webcrypto-0.6.1/hook/build.dart:52:5)
<asynchronous suspension>
#7      build (package:hooks/src/api/build_and_link.dart:191:5)
<asynchronous suspension>
#8      main (file:///home/build/.pub-cache/hosted/pub.dev/webcrypto-0.6.1/hook/build.dart:24:3)
<asynchronous suspension>

  Building assets for package:webcrypto failed.
  build.dart returned with exit code: 255.

Exception comes from this line:

native_toolchain_cmake/lib/src/builder/run_builder.dart

Line 126 in f267613

final toolUri = tool?.first.uri.resolve('build/cmake/android.toolchain.cmake');

To Reproduce

1. Build Goguma with https://codeberg.org/emersion/goguma/pulls/364

Expected behavior
Build should not fail (or should report a clear error describing what's wrong).

Desktop (please complete the following information):

• OS: Arch Linux

Smartphone (please complete the following information): N/A

Additional context
Full logs: https://builds.sr.ht/~emersion/job/1764286#task-build

[rainyl]

@emersion Hi. It looks like your android sdk is installed in /opt/android-sdk, while native_toolchain_cmake will only look up it in [r'$HOME/Android/Sdk/ndk/*/', r'$HOME/Android/Sdk/ndk-bundle/'] and the relative path of ndk-build by default.

For non-standard install locations, you can configure it in pubspec.yaml, please refer to https://pub.dev/packages/native_toolchain_cmake#configuration

[!] Android toolchain - develop for Android devices [32ms]
    • Android SDK at /opt/android-sdk
    • Emulator version unknown
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.

    ✗ No valid Android SDK platforms found in /opt/android-sdk/platforms. Directory was empty.
    • Try re-installing or updating your Android SDK,
      visit https://flutter.dev/to/linux-android-setup for detailed instructions.

[emersion]

The Flutter tool finds the SDK though. Seems like it searches these locations too:

https://github.com/flutter/flutter/blob/2731746a84da58e3cb86932af2c361009d234067/packages/flutter_tools/lib/src/android/android_sdk.dart#L126-L146

native_toolchain_cmake could try these locations too, to align with the flutter tool behavior. It could also read the Flutter config file, so that users don't have to go and configure each and every tool that needs this path.

[rainyl]

Sounds okay, will support it.