build of v1.1.30 fails claiming outdated Kotlin Gradle plugin

[IzzySoft]

I've tried to build Obtainium from source to check for Reproducible Builds, but the build failed:

BUILD FAILED in 7m 35s
Running Gradle task 'assembleRelease'...                          456.5s

┌─ Flutter Fix ────────────────────────────────────────────────────────────────────────────────┐
│ [!] Your project requires a newer version of the Kotlin Gradle plugin.                       │
│ Find the latest version on https://kotlinlang.org/docs/releases.html#release-details, then   │
│ update the                                                                                   │
│ version number of the plugin with id "org.jetbrains.kotlin.android" in the plugins block of  │
│ /home/runner/work/Obtainium/Obtainium/android/settings.gradle.                               │
│                                                                                              │
│ Alternatively (if your project was created before Flutter 3.19), update                      │
│ /home/runner/work/Obtainium/Obtainium/android/build.gradle                                   │
│ ext.kotlin_version = '<latest-version>'                                                      │
└──────────────────────────────────────────────────────────────────────────────────────────────┘
Gradle task assembleRelease failed with exit code 1

Build recipe used, orienting on your .github workflow:

build:
  - sed -r '/signingConfigs.release/d' -i android/app/build.gradle
  - export PUB_CACHE=$(pwd)/.pub-cache
  - .flutter/bin/flutter config --no-analytics
  - .flutter/bin/flutter pub get
  - .flutter/bin/flutter build apk --release --split-per-abi --target-platform="android-arm"

Did I get something wrong – or do you have a clue what might need fixing? Thanks in advance!

[ImranR98]

Hmm, not sure what changed - I haven't modified anything related to the build. I see that F-Droid does have the latest version so it looks like they were able to create a reproducible build.

[IzzySoft]

Thanks for your swift reply, Imran! F-Droid builds a different flavor:

      - .flutter/bin/flutter build apk --release --split-per-abi --target-platform="android-arm"
        --flavor fdroid -t lib/main_fdroid.dart

I didn't try the fdroid flavor and neither the -t. Thanks to your pointer to F-Droid's build I've noticed having missed the transistor-background-fetch dependency – but even with that integrated, I still get the above error, also with v1.1.31 now. Very strange, as F-Droid's builder runs on Debian bookworm with OpenJDK-17, and that's what I've configured for Obtainium here as well.

In android/settings.gradle, you've defined id "org.jetbrains.kotlin.android" version "1.8.10" apply false – that's a version from 2/2023. Recent version now would be 2.0.21. As F-Droid uses their own gradle, they might have replaced that (their recipe doesn't tell such things). Are you really building against 1.8.10?

What's even more strange: I've tried a last time with 1.8.10 replaced by 2.0.21, and get the very same error. Now I'm rather clueless…