Builds fails (due to tests)

I’m running the build on 64-bit Raspberry Pi OS. It is failing due to not being able to find .NET Core 3.1.

I run build.sh. Here is a relevant bit of the console log from that.

rich@raspberrypi:~/iot $ ./build.sh
  Determining projects to restore...
  All projects are up-to-date for restore.
Attempting to install dotnet from public_location.
dotnet-install: Note that the intended use of this script is for Continuous Integration (CI) scenarios, where:
dotnet-install: - The SDK needs to be installed without user interaction and without admin rights.
dotnet-install: - The SDK installation doesn't need to persist across multiple CI runs.
dotnet-install: To set up a development environment or to run apps, use installers rather than this script. Visit https://dotnet.microsoft.com/download to get the installer.

dotnet-install: .NET Core Runtime with version '3.1.21' is already installed.

And then later:

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
Testhost process exited with error: It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '3.1.0' (arm64) was not found.
  - The following frameworks were found:
      6.0.0 at [/home/rich/iot/.dotnet/shared/Microsoft.NETCore.App]
      6.0.2 at [/home/rich/iot/.dotnet/shared/Microsoft.NETCore.App]
You can resolve the problem by installing the specified framework and/or SDK.
The specified framework can be found at:
  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=3.1.0&arch=arm64&rid=debian.11-arm64
. Please check the diagnostic logs for more information.

Test Run Aborted.
  ServoMotor.Tests -> /home/rich/iot/src/devices/ServoMotor/tests/bin/Debug/netcoreapp3.1/ServoMotor.Tests.dll
  Ssd13xx.Tests -> /home/rich/iot/src/devices/Ssd13xx/tests/bin/Debug/netcoreapp3.1/Ssd13xx.Tests.dll
/home/rich/iot/build.proj(65,5): error : Unit tests failed. Please check the detailed log to find out which ones failed.

And dotnet --info:

rich@raspberrypi:~/iot $ dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100
 Commit:    9e8b04bbff

Runtime Environment:
 OS Name:     debian
 OS Version:  11
 OS Platform: Linux
 RID:         debian.11-arm64
 Base Path:   /home/rich/iot/.dotnet/sdk/6.0.100/

Host (useful for support):
  Version: 6.0.2
  Commit:  839cdfb0ec

.NET SDKs installed:
  6.0.100 [/home/rich/iot/.dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.0 [/home/rich/iot/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.0 [/home/rich/iot/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.2 [/home/rich/iot/.dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

[joperezr]

Thanks for logging @richlander I do see why this is happening. If you take a look at our current global.json file:

https://github.com/dotnet/iot/blob/d84c3e8b25b5c3e3363f096647487ab62ee0b26f/global.json#L4-L8

We are restoring netcoreapp3.1 in order to run those tests but only for x64 platforms as that is what most people are running. In order to fix this issue, we just need to add another entry there to ensure that arm64 also restores the 3.1 runtime.

[joperezr]

[Triage]: This should be fixed now. We haven’t seen any issues in CI due to this and we have changed the targets for our tests. Closing for now.