Two MacCatalyst RIDs can cause `error : Unable to merge the file 'Contents/Resources/Assets.car'`

[jonathanpeppers]

Steps to Reproduce

1. build a MAUI app targeting MacCatalyst with RuntimeIdentifiers=maccatalyst-x64;maccatalyst-arm64
2. sometimes it fails with errors like:

/Users/runner/.dotnet/packs/Microsoft.MacCatalyst.Sdk/15.4.454/targets/Xamarin.Shared.Sdk.targets(371,3): error : Unable to merge the file 'Contents/Resources/Assets.car', it's different between the input app bundles. [/Users/runner/work/inclusive-code-reviews-ml/inclusive-code-reviews-ml/Maui/MLTrainer/MLTrainer.csproj]
/Users/runner/.dotnet/packs/Microsoft.MacCatalyst.Sdk/15.4.454/targets/Xamarin.Shared.Sdk.targets(371,3): error : App bundle file #1: /Users/runner/work/inclusive-code-reviews-ml/inclusive-code-reviews-ml/Maui/MLTrainer/bin/Release/net6.0-maccatalyst/maccatalyst-x64/MLTrainer.app/Contents/Resources/Assets.car [/Users/runner/work/inclusive-code-reviews-ml/inclusive-code-reviews-ml/Maui/MLTrainer/MLTrainer.csproj]
/Users/runner/.dotnet/packs/Microsoft.MacCatalyst.Sdk/15.4.454/targets/Xamarin.Shared.Sdk.targets(371,3): error : App bundle file #2: /Users/runner/work/inclusive-code-reviews-ml/inclusive-code-reviews-ml/Maui/MLTrainer/bin/Release/net6.0-maccatalyst/maccatalyst-arm64/MLTrainer.app/Contents/Resources/Assets.car 

My rough estimate is that this fails on GitHub actions around 1 in 10 tries. I think we also saw it on MAUI's CI here: dotnet/maui#9968 (comment)

Expected Behavior

RuntimeIdentifiers=maccatalyst-x64;maccatalyst-arm64 doesn't fail the build.

Actual Behavior

RuntimeIdentifiers=maccatalyst-x64;maccatalyst-arm64 sometimes fails the build.

Environment

CI reported these versions:

dotnet-install: .NET Core SDK with version '6.0.401' is already installed.
...
Run dotnet workload install maui-desktop --ignore-failed-sources

Skipping NuGet package signature verification.
Skipping NuGet package signature verification.
Skipping NuGet package signature verification.
Installing workload manifest microsoft.net.sdk.android version 32.0.465…
Installing workload manifest microsoft.net.sdk.ios version 15.4.454…
Installing workload manifest microsoft.net.sdk.maccatalyst version 15.4.454…
Installing workload manifest microsoft.net.sdk.macos version 12.3.454…
Installing workload manifest microsoft.net.sdk.maui version 6.0.540…
Installing workload manifest microsoft.net.sdk.tvos version 15.4.454…
Installing workload manifest microsoft.net.workload.mono.toolchain version 6.0.9…
Installing workload manifest microsoft.net.workload.emscripten version 6.0.9…
Installing pack Microsoft.Maui.Core.Ref.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Ref.maccatalyst version 6.0.540...
Installing pack Microsoft.Maui.Core.Runtime.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Runtime.maccatalyst version 6.0.540...
Installing pack Microsoft.Maui.Controls.Ref.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Ref.maccatalyst version 6.0.540...
Installing pack Microsoft.Maui.Controls.Runtime.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Runtime.maccatalyst version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Ref.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Ref.maccatalyst version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Runtime.maccatalyst version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Runtime.maccatalyst version 6.0.540...
Installing pack Microsoft.AspNetCore.Components.WebView.Maui version 6.0.540...
Writing workload pack installation record for Microsoft.AspNetCore.Components.WebView.Maui version 6.0.540...
Installing pack Microsoft.Maui.Dependencies version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Dependencies version 6.0.540...
Installing pack Microsoft.Maui.Sdk version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Sdk.net6 version 6.0.540...
Installing pack Microsoft.Maui.Extensions version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Extensions version 6.0.540...
Installing pack Microsoft.Maui.Graphics version 6.0.501...
Writing workload pack installation record for Microsoft.Maui.Graphics version 6.0.501...
Installing pack Microsoft.Maui.Resizetizer.Sdk version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Resizetizer.Sdk version 6.0.540...
Installing pack Microsoft.Maui.Templates.net6 version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Templates.net6 version 6.0.540...
Installing pack Microsoft.Maui.Core.Ref.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Ref.any version 6.0.540...
Installing pack Microsoft.Maui.Core.Runtime.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Runtime.any version 6.0.540...
Installing pack Microsoft.Maui.Controls.Ref.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Ref.any version 6.0.540...
Installing pack Microsoft.Maui.Controls.Runtime.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Runtime.any version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Ref.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Ref.any version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Runtime.any version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Runtime.any version 6.0.540...
Installing pack Microsoft.MacCatalyst.Sdk version 15.4.454...
Writing workload pack installation record for Microsoft.MacCatalyst.Sdk.net6 version 15.4.454...
Installing pack Microsoft.MacCatalyst.Ref version 15.4.454...
Writing workload pack installation record for Microsoft.MacCatalyst.Ref version 15.4.454...
Installing pack Microsoft.MacCatalyst.Runtime.maccatalyst-arm64 version 15.4.454...
Writing workload pack installation record for Microsoft.MacCatalyst.Runtime.maccatalyst-arm64 version 15.4.454...
Installing pack Microsoft.MacCatalyst.Runtime.maccatalyst-x64 version 15.4.454...
Writing workload pack installation record for Microsoft.MacCatalyst.Runtime.maccatalyst-x64 version 15.4.454...
Installing pack Microsoft.MacCatalyst.Templates version 15.4.454...
Writing workload pack installation record for Microsoft.MacCatalyst.Templates version 15.4.454...
Installing pack Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.maccatalyst-arm64 version 6.0.9...
Writing workload pack installation record for Microsoft.NETCore.App.Runtime.AOT.Cross.net6.maccatalyst-arm64 version 6.0.9...
Installing pack Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.maccatalyst-x64 version 6.0.9...
Writing workload pack installation record for Microsoft.NETCore.App.Runtime.AOT.Cross.net6.maccatalyst-x64 version 6.0.9...
Installing pack Microsoft.NETCore.App.Runtime.Mono.maccatalyst-arm64 version 6.0.9...
Writing workload pack installation record for Microsoft.NETCore.App.Runtime.Mono.net6.maccatalyst-arm64 version 6.0.9...
Installing pack Microsoft.NETCore.App.Runtime.Mono.maccatalyst-x64 version 6.0.9...
Writing workload pack installation record for Microsoft.NETCore.App.Runtime.Mono.net6.maccatalyst-x64 version 6.0.9...
Installing pack Microsoft.NET.Runtime.MonoAOTCompiler.Task version 6.0.9...
Writing workload pack installation record for Microsoft.NET.Runtime.MonoAOTCompiler.Task.net6 version 6.0.9...
Installing pack Microsoft.NET.Runtime.MonoTargets.Sdk version 6.0.9...
Writing workload pack installation record for Microsoft.NET.Runtime.MonoTargets.Sdk.net6 version 6.0.9...
Installing pack Microsoft.Maui.Core.Ref.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Ref.win version 6.0.540...
Installing pack Microsoft.Maui.Core.Runtime.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Core.Runtime.win version 6.0.540...
Installing pack Microsoft.Maui.Controls.Ref.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Ref.win version 6.0.540...
Installing pack Microsoft.Maui.Controls.Runtime.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Controls.Runtime.win version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Ref.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Ref.win version 6.0.540...
Installing pack Microsoft.Maui.Essentials.Runtime.win version 6.0.540...
Writing workload pack installation record for Microsoft.Maui.Essentials.Runtime.win version 6.0.540...
Installing pack Microsoft.Maui.Graphics.Win2D.WinUI.Desktop version 6.0.501...
Writing workload pack installation record for Microsoft.Maui.Graphics.Win2D.WinUI.Desktop version 6.0.501...
Garbage collecting for SDK feature band(s) 6.0.400...

Successfully installed workload(s) maui-desktop.

Build Logs

This happened here: https://github.com/jonathanpeppers/inclusive-code-reviews-ml/actions/runs/3101122438/jobs/5022151673

logs.zip

Example Project (If Possible)

Using this project:

https://github.com/jonathanpeppers/inclusive-code-reviews-ml/tree/main/Maui/MLTrainer

[jonathanpeppers]

If you look here, you can get an idea of the frequency:

https://github.com/jonathanpeppers/inclusive-code-reviews-ml/commits/main

The two recent "red" GitHub statuses are this issue.

[rolfbjarne]

It's the same thing as this: dotnet/maui#9968 (comment)

[rolfbjarne]

I'm adding a public MSBuild property that MAUI can hook into instead of using private targets.

I've also created a MAUI issue to have them update their code: dotnet/maui#10272