[Bug]: Errors NU3028 and NU3037 when restoring NuGet packages on FreeBSD

[joperator]

NuGet Product Used

dotnet.exe

Product Version

.NET SDK (reflecting any global.json): Version: 6.0.100-dev Commit: 2f6dac4342 Runtime Environment: OS Name: FreeBSD OS Version: 12 OS Platform: FreeBSD RID: freebsd.12-x64 Base Path: /usr/local/share/dotnet/sdk/6.0.100-dev/ Host (useful for support): Version: 6.0.0 Commit: N/A .NET SDKs installed: 6.0.100-dev [/usr/local/share/dotnet/sdk] .NET runtimes installed: Microsoft.AspNetCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] To install additional .NET runtimes or SDKs: https://aka.ms/dotnet-download

Worked before?

It worked until the root certificate of the corresponding timestamp provider chain was removed: NuGet/Announcements#56

Impact

It's more difficult to complete my work

Repro Steps & Context

This issue has already been fixed by #3979 for Linux and MacOS but not for FreeBSD, because RuntimeEnvironmentHelper.IsLinux returns false if IS_CORECLR is defined. According to common.targets IS_CORECLR is defined for all target frameworks starting with netcoreapp, netstandard or net6, and therefore the code that causes this issue is included by a NuGet package in the dotnet executable.

Verbose Logs

Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json': 
  Signature type: Repository
  Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json':   Subject Name: CN=NuGet.org Repository by Microsoft, O=NuGet.org Repository by Microsoft, L=Redmond, S=Washington, C=US
  Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json':   SHA256 hash: 0E5F38F57DC1BCC806D8494F4F90FBCEDD988B46760709CBEEC6F4219AA6157D
  Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json':   Valid from: 04/10/2018 00:00:00 to 04/14/2021 12:00:00
/usr/home/Administrator/ConsoleApp/ConsoleApp.csproj : error NU3037: Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature validity period has expired.
/usr/home/Administrator/ConsoleApp/ConsoleApp.csproj : error NU3028: Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature's timestamping certificate is not trusted by the trust provider.
  Failed to restore /usr/home/Administrator/ConsoleApp/ConsoleApp.csproj (in 1.37 sec).

Build FAILED.

/usr/home/Administrator/ConsoleApp/ConsoleApp.csproj : error NU3037: Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature validity period has expired.
/usr/home/Administrator/ConsoleApp/ConsoleApp.csproj : error NU3028: Package 'System.Runtime 4.0.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature's timestamping certificate is not trusted by the trust provider.
    0 Warning(s)
    2 Error(s)

[nkolev92]

because RuntimeEnvironmentHelper.IsLinux returns false if IS_CORECLR is defined

Not sure this is the correct interpretation.

It's likely that https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.runtimeinformation.isosplatform?view=net-6.0 that returns false when on FreeBSD.

The FreeBSD option was added in https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.osplatform?view=netcore-3.0 netcoreapp3.0 but wasn't a thing before.

[joperator]

It's likely that https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.runtimeinformation.isosplatform?view=net-6.0 that returns false when on FreeBSD.

I checked it and System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Linux) returns false on FreeBSD.